当前位置：文档库 › MAX1604中文资料

MAX1604中文资料

________________General Description

The MAX1601/MAX1604 DC power-switching ICs con-tain a network of low-resistance MOSFET switches that deliver selectable VCC and VPP voltages to two CardBus or PC Card host sockets. Key features include ultra-low-resistance switches, small packaging, soft-switching action, and compliance with PCMCIA specifi-cations for 3V/5V switching. 3.3V-only power switching for fast, 32-bit CardBus applications is supported in two ways: stiff, low-resistance 3.3V switches allow high 3.3V load currents (up to 1A); and completely independent internal charge pumps let the 3.3V switch operate nor-mally, even if the +5V and +12V supplies are discon-nected or turned off to conserve power. The internal charge pumps are regulating types that draw reduced input current when the VCC switches are static. Also,power consumption is automatically reduced to 10μA max when the switches are programmed to high-Z or GND states over the serial interface, unlike other solu-tions that may require a separate shutdown-control input.

Other key features include guaranteed specifications for output current limit level, and guaranteed specifications for output rise/fall times (in compliance with PCMCIA specifications). Reliability is enhanced by thermal-over-load protection, accurate current limiting, an overcur-rent-fault flag output, undervoltage lockout, and extra ESD protection at the VCC/VPP outputs. The SMBus ser-ial interface is flexible, and can tolerate logic input levels in excess of the positive supply rail.

The MAX1604 and MAX1601 are identical, except for the MAX1604’s VY switch, which has roughly three-times the on-resistance (typically 140m ?).The MAX1601/MAX1604 fit two complete CardBus/PCMCIA switches into a space-saving, narrow (0.2in. or 5mm wide) SSOP package.

________________________Applications

Desktop Computers Data Loggers Notebook Computers Digital Cameras Docking Stations Printers

Handy-Terminals

PCMCIA Read/Write Drives

____________________________Features

o Supports Two CardBus Sockets

o 1A, 0.08?Max VY VCC Switch (MAX1601 only)1A, 0.14?Max VX VCC Switch

o Soft Switching for Low Inrush Surge Current o Overcurrent Protection

o Overcurrent/Thermal-Fault Flag Output o Thermal Shutdown at T j = +150°C o Independent Internal Charge Pumps o Break-Before-Make Switching Action o 10μA Max Standby Supply Current

o 5V and 12V Not Required for Low-R DS(ON)3.3V Switching

o Complies with PCMCIA 3V/5V Switching Specifications

o Super-Small, 28-Pin SSOP Package (0.2in. or 5mm wide)

o System Management Bus (SMBus) Serial Interface

MAX1601/MAX1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface

________________________________________________________________Maxim Integrated Products

For free samples & the latest literature: https://www.wendangku.net/doc/ec16717361.html,, or phone 1-800-998-8800

19-1085; Rev 1; 10/96

Pin Configuration appears on last page.

SMBus is a trademark of Intel Corp.

__________Simplified Block Diagram

M A X 1601/M A X 1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface 2_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

(VL = VY = 3.3V, VX = 5V, 12INA = 12INB = 12V, T A = 0°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ABSOLUTE MAXIMUM RATINGS

Note 1:There are no parasitic diodes between any of these pins, so there are no power-up sequencing restrictions (for example,

logic input signals can be applied even if all of the supply voltage inputs are grounded).

Note 2:VCC and VPP outputs are internally current-limited to safe values. See the Electrical Characteristics table.

Inputs/Outputs to GND

(VL, VX, VY, VCCA, VCCB) (Note 1)........................-0.3V, +6V VPP Inputs/Outputs to GND

(12INA, 12INB, VPPA, VPPB) (Note 1)..................-0.3V, +15V Inputs and Outputs to GND (SMBCLK, SMBDATA,

SMBSUS, SMBALERT ) (Note 1)..............................-0.3V, +6V ADR Input to GND ...........................................-0.3V, (VL + 0.3V)VCCA, VCCB Output Current (Note 2).....................................4A VPPA, VPPB Output Current (Note 2)...............................250mA

VCCA, VCCB Short Circuit to GND............................Continuous VPPA, VPPB Short Circuit to GND..............................Continuous Continuous Power Dissipation (T A = +70°C)

SSOP (derate 9.52mW/°C above +70°C)....................762mW Operating Temperature Range

MAX1601EAI/MAX1604EAI .............................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°C

MAX1601/MAX1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface

_______________________________________________________________________________________3

ELECTRICAL CHARACTERISTICS (continued)

(VL = VY = 3.3V, VX = 5V, 12INA = 12INB = 12V, T A = 0°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)

M A X 1601/M A X 1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface 4_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VL = VY = 3.3V, VX = 5V, 12INA = 12INB = 12V, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.)

Note 3:Not production tested.

Note 4:Thermal limit not active in standby state (all switches programmed to GND or high-Z state).

Note 5:A transition must internally provide at least a hold time in order to bridge the undefined region (300ns max) of the falling

edge of SMBCLK.

MAX1601/MAX1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface

_______________________________________________________________________________________5

ELECTRICAL CHARACTERISTICS

(VL = VY = 3.3V, VX = 5V, 12INA = 12INB = 12V, T A = -40°C to +85°C, unless otherwise noted.)

M A X 1601/M A X 1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface 6_______________________________________________________________________________________

C L = 30μF, R L = 25?

VCC_ SWITCHING (RISE)

420

200μs/div

VCC_ (V)

CONTROL INPUT

(V)

M A X 1601/4 T O C -01

C L = 1μF, R L = ∞

VCC_ SWITCHING (RISE)

210

500μs/div

VCC_ (V)

CONTROL INPUT

(V)

M A X 1601/4 T O C -02

C L = 33μF, R L = ∞

VCC_ SWITCHING (FALL)

420

5010ms/div

VCC_ (V)

CONTROL INPUT

(V)

M A X 1601/4 T O C -03

C L = 0.1μF, R L = ∞

VPP_ SWITCHING (RISE)

1510

200μs/div

VPP_

(V)

CONTROL INPUT

(V)

M A X 1601/4 T O C -05

C L = 1μF, R L = 25?

VCC_ SWITCHING (FALL)

010ms/div

VCC_ (V)

CONTROL INPUT

(V)

M A X 1601/4 T O C -04

VPP_ SWITCHING (FALL)

1510

502ms/div

VPP_ (V)

CONTROL INPUT

(V)

M A X 1601/4 T O C -06

C L = 0.1μF, R L = ∞

__________________________________________Typical Operating Characteristics

(VL = VY = 3.3V, VX = 5V, 12IN, T A = +25°C, unless otherwise noted.)

MAX1601/MAX1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface

_______________________________________________________________________________________7

_____________________________Typical Operating Characteristics (continued)

(VL = VY = 3.3V, VX = 5V, 12IN, T A = +25°C, unless otherwise noted.)

C L = 1μF, RESISTIVE OVERLOAD, R L = 1?

VCC_ CURRENT LIMITING

2ms/div

VCC_ (V)

M A X 1601/4 T O C -08

INPUT CURRENT (VCC OUTPUT SHORTED)

1.5

2.01.00.50

1ms/div

I VY (A)

M A X 1601/4 T O C -09

R L = 0.1?

INPUT CURRENT (VPP OUTPUT SHORTED)

105

020********

100μs/div

VPP_ (V)

I 12IN_(mA)

M A X 1601/4 T O C -11

C L = 1μF, R L = 50?

VPP_ CURRENT LIMITING

1050

2ms/div

VPP_ (V)

M A X 1601/4 T O C -10

CIRCUIT OF FIGURE 2

VCC_ SHUTDOWN RESPONSE

4204

100μs/div

VL (V)

VCC_ (V)

M A X 1601/4 T O C -12

M A X 1601/M A X 1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface 8_______________________________________________________________________________________

165

115

1000

MAX1604

VY ON-RESISTANCE vs. CURRENT

125155

CURRENT (mA)

V Y R O N (m ?)

200

400

600

800

145135120130

16015014011060

1000VX ON-RESISTANCE vs. VCC_ LOAD CURRENT

70100

VCC_ LOAD CURRENT (mA)V X R O N (m ?)

200

400

600

8009080657510595858030

01000

MAX1601

VY ON-RESISTANCE vs. CURRENT

4070

CURRENT (mA)

V Y R O N (m ?)

20040060080060503545756555

685

100

12014012IN_ ON-RESISTANCE vs. CURRENT

700CURRENT (mA)12I N R O N (m ?)

720710690695705725715550

-406080100

12IN_ ON-RESISTANCE vs. TEMPERATURE

700M A X 1601/4 T O C -16

TEMPERATURE (°C)

12I N R O N (m ?)

-2002040900800600650750950

85000

VX, VY SUPPLY CURRENT vs. INPUT VOLTAGE

0.3

INPUT VOLTAGE (V)

V X , V Y S U P P L Y C U R R E N T (μA )

0.70.50.10.20.40.80.90.6

12IN SUPPLY CURRENT vs. INPUT VOLTAGE

3INPUT VOLTAGE (V)12I N S U P P L Y C U R R E N T (μA )

7512460

VL SUPPLY CURRENT vs. VL INPUT VOLTAGE

30INPUT VOLTAGE (V)

V L S U P P L Y C U R R E N T (μA )

705010204060_____________________________Typical Operating Characteristics (continued)

(VL = VY = 3.3V, VX = 5V, 12IN, T A = +25°C, unless otherwise noted.)

MAX1601/MAX1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface

_______________________________________________________________________________________9

______________________________________________________________Pin Description

M A X 1601/M A X 1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface 10

______________________________________________________________________________________

Figure 1. Functional Diagram (one channel of two)

MAX1601/MAX1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface

______________________________________________________________________________________11

_______________Detailed Description

The MAX1601/MAX1604 power-switching ICs contain a network of low-resistance MOSFET switches that deliver selectable VCC and VPP voltages to two Cardbus or PC Card host sockets. The MAX1601/MAX1604 differ only in the VY switch on-resistance. Figure 1 is the detailed block diagram.

The power-input pins (VY, VX, 12IN_) are completely independent. Low inrush current is guaranteed by con-trolled switch rise times. VCC’s 100μs minimum output rise time is 100% tested with a 1μF capacitive load, and VPP’s 1ms minimum rise time is guaranteed with a 0.1μF load. These respective capacitive loads are chosen as worst-case card-insertion parameters. The internal switching control allows VCC and VPP rise times to be controlled, and makes them nearly independent of resis-tive and capacitive loads (see rise-time photos in the Typical Operating Characteristics ). Fall times are a function of loading, and are compensated by internal circuitry.

Power savings is automatic: internal charge pumps draw very low current when the VCC switches are static.Standby mode reduces switch supply current to 1μA.Driving the VL pin low with an external logic gate (master shutdown) reduces total supply current to1μA (Figure 2).

Operating Modes

The MAX1601/MAX1604 have three operating modes:normal, standby, and shutdown. Normal mode supplies the selected outputs with their appropriate supply volt-ages. Standby mode places all switches at ground, high impedance, or a combination of the two. Shutdown mode turns all switches off, and puts the VCC and VPP outputs into a high-impedance state. Pull VL low to enter shutdown mode. To ensure a 0.05V/μs fall rate on VL, use a 1k ?series resistor and a 0.1μF capacitor to ground (Figure 2).

Overcurrent Protection

Peak detecting circuitry protects both the VCC and VPP switches against overcurrent conditions. When current through any switch exceeds the internal current limit (4A for VCC switches and 200mA for VPP switch-es), the switch turns off briefly, then turns on again at the controlled rise rate. If the overcurrent condition lasts more than 2μs, the SMBALERT output latches

low. A continuous short-circuit condition results in a pulsed output current until thermal shutdown is reached. SMBALERT is open-drain and requires an external pull-up resistor.

Thermal Shutdown

If the IC junction temperature rises above +150°C, the thermal shutdown circuitry opens all switches, including the GND switches, and SMBALERT is pulled low. When the temperature falls below +130°C, the switches turn on again at the controlled rise rate. If the overcurrent condition remains, the part cycles between thermal shutdown and overcurrent.

Undervoltage Lockout

If the VX or VY switch input voltage drops below 1.5V,the associated switch turns off and SMBALERT goes low. For example, if VY is 3.3V and VX is 0V, and if the interface controller selects VY, the VCCA output will be 3.3V. If VX is selected, VCCA changes to a high-imped-ance output and SMBALERT goes low.

When a voltage is initially applied to 12IN_, it must be greater than 8V to allow the switch to operate.Operation continues until the voltage falls below 2V (the VPP output is high impedance).

When VL drops to less than 2.3V, all switches are turned off and the VCC and VPP outputs are high impedance.

Figure 2. Master Shutdown Circuit

M A X 1601/M A X 1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface 12

______________________________________________________________________________________

______SMBus? Interface Operation

The SMBus serial interface is a two-wire interface with multi-mastering capability, intended to control low-speed peripheral devices in low-power portable equip-ment applications. SMBus is similar to I 2C? and AccessBus, but has slightly different logic threshold voltage levels, different fixed addresses, and a sus-pend-mode register capability. To obtain a complete set of specifications on the SMBus interface, call Intel at (800) 253-3696 and ask for product code SBS5220.

SMBus Addressing

These dual-channel PC Card switch devices respond to two of four different addresses, depending on the state of the ADR address pin. Normal writing to the device is done by transmitting one of four addresses, followed by a single data byte, to program the channel selected.Write transmissions to the interrupt pointer address are not supported by these devices. Reading from the device is done by transmitting one of two addresses cor-

responding to either the A channel address (which will provide data about faults for both A and B channels) or to the interrupt pointer address (discussed later).

The normal start condition consists of a high-to-low transition on SMBDATA while SMBCLK is high. The 7-bit address is followed by a bit that designates a read or write operation: high = read, low = write. If the 7-bit address matches one of the supported function addresses, the IC issues an acknowledge pulse by pulling the SMBDATA line low. If the address is not valid, the IC stays off of the bus and ignores any data on the bus until a new start condition is detected. Once the IC receives a valid address that includes a write bit,it expects to receive one additional byte of data. If a stop condition or new start condition is detected before a complete byte of data is clocked in, the IC interprets this as an error and all of the data is rejected and lost.SMBDATA and SMBCLK are Schmitt triggered and can accommodate slower edges. However, rising edges should still be faster than 1μs, and falling edges should be faster than 300ns.

SMBus Write Operations

If the IC receives a valid address immediately followed by a write bit, the IC becomes a slave receiver. The slave IC generates a first acknowledge after the address and write bit, and a second acknowledge after the command byte. A stop condition following the com-mand (data) byte causes immediate execution of the command, unless the data included a low SUS/OP bit.If the data included a low SUS/OP bit, the command is stored in the suspend-mode register and is executed only when the SMBSUS pin is pulled low (Figure 3).

Table 1. SMBus Addressing

Table 2. Command Format for Channel A Write Operations (address 1010000 or 1010010)

I 2C is a trademark of Philips Corp.SMBus is a trademark of Intel Corp.Masks fault interrupts from both channel A and channel B when high.

MASKFLT

0 (LSB)

Puts VPPA in a high-impedance state when high. Overrides VPPAON.0VPPAHIZ 1If VPPA is on, a high connects VPPA to 12INA, and a low connects VPPA to VCCA.0VPPAPGM 2Turns on VPPA when high, pulls VPPA to GND when low.

0VPPAON 3Puts VCCA in a high-impedance state when high. Overrides VCCAON.0VCCAHIZ 4If VCCA is on, a high connects VY to VCCA, and a low connects VX to VCCA.0VCCA3/55Turns on VCCA when high, pulls VCCA to GND when low.

0VCCAON 6Operate/suspend bit. Selects which latch receives data: high = operation, low = suspend.

0OP/SUS 7 (MSB)

FUNCTION

POR STATE

NAME BIT

MAX1601/MAX1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface

______________________________________________________________________________________13

Table 3. Command Format for Channel B Write Operations (address 1010001 or 1010011)

Table 4. Read Format for Interrupt Pointer Address (0001100)

Table 5. Read Format for Power Switch Address (1010000 or 1010010)

BIT NAME POR STATE

FUNCTION

7 (MSB)

CATFAULT 0Indicates catastrophic (thermal or undervoltage lockout) fault when high.6FAULT10Indicates VCCA overcurrent/undervoltage lockout when high.5FAULT20Indicates VPPA overcurrent/undervoltage lockout when high.4FAULT30Indicates VCCB overcurrent/undervoltage lockout when high.3FAULT40Indicates VPPB overcurrent/undervoltage lockout when high.2SIG/DUAL 0Indicates dual part (single-channel devices would read 1).1RFU 0Reserved for future use.0 (LSB)

RFU

Reserved for future use.

LATCHED?

Y Y Y Y Y N N N

M A X 1601/M A X 1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface 14______________________________________________________________________________________

Figure 3. SMBus Write Timing Diagram

SMBus Read Operations

If the IC receives a valid address that includes a read bit, the IC becomes a slave transmitter. After receiving the address data, the IC generates an acknowledge during the acknowledge clock pulse and drives the SMBDATA line in sync with SMBCLK. The SMB proto-col requires that the master end the read transmission by not acknowledging during the acknowledge bit of SMBCLK. These PC Card ICs support the repeated start-condition method for changing data-transfer direc-tion; that is, a write transmission followed by a repeated start instead of a stop condition prepares the IC for data reading (Figure 4).

SMBus Interrupts

These PC Card power-switch ICs are slave devices only, and never initiate communications except by asserting an interrupt (by pulling SMBALERT low).Interrupts are generated only for reporting fault condi-tions, including overcurrent at VCCA, VCCB, VPPA, or VPPB, undervoltage lockout, and IC thermal overload. If an interrupt occurs, it can be an indication of impend-ing system failure. The host system can react by going into suspend mode or taking other action. It can come back later to interrogate the IC via the interrupt pointer to determine status or perform corrective action (such as disabling the appropriate power switch that might be connected to a shorted PC card).The fastest method for turning off the switches in response to a

fault condition is to cycle the voltage on VL in order to generate a power-on reset (which clears all of the SMBus registers). Note that the SMBus registers retain their data even if the main VX/VY supplies are turned off, provided that VL remains powered.

When a fault occurs, SMBALERT is immediately assert-ed and latched low. If the fault is momentary and disap-pears before the IC is serviced, the data is still latched in the interrupt pointer and SMBALERT remains assert-ed. Normally, the master (host system or PCMCIA digi-tal controller) now sends out the interrupt pointer address (00011000) followed by a read bit. SMBALERT is cleared and the PC Card IC responds by putting out its address on the bus. If the fault persists, SMBALERT is re-asserted, but the data in the fault registers is not reloaded. The data in the fault latches only reflects the first time SMBALERT is asserted.

When the part enters operating mode, a false interrupt flag may be issued. The user needs to send the inter-rupt address to clear the false interrupt.

Normally, the master sends out the appropriate PC Card switch address on the bus, followed by a read bit. The data in the fault registers is then clocked out onto the bus (which also clears the fault registers). If the fault persists, the fault bits and SMBALERT are latched again.

MAX1601/MAX1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface

______________________________________________________________________________________

Figure 4. SMBus Read Timing Diagram

The interrupt pointer address provides quick fault iden-tification for simple slave devices that lack the complex,expensive logic needed to be a bus master. The host can read the interrupt pointer to determine which slave device generated an SMBALERT interrupt signal. The interrupt pointer address can activate several different slave devices simultaneously, similar to an I 2C general call. Any slave device that generated an interrupt attempts to identify itself by putting its own address on the bus during the first read byte. If more than one slave attempts to respond, bus arbitration rules apply and the device with the lower address code wins. The losing device won’t generate an acknowledge and will contin-ue to hold the SMBALERT line low until serviced, which implies that the host interrupt input must be level sensitive.

__________Applications Information

Supply Bypassing

Bypass the VY, VX, and 12IN_ inputs with ceramic 0.1μF capacitors. Bypass the VCC_ and VPP_ outputs with a 0.1μF capacitor for noise reduction and ESD protection.

Power-Up

Apply power to the VL input before any of the switch inputs. If VX, VY, or 12IN receive power before VL rises above 2.8V, the supply current may be artificially high (about 5mA). When the voltage on VL is greater than 2.8V (operating mode), the part consumes its specified 24μA. To avoid power sequencing, diode-OR VX and VY to VL through a 1k ?resistor (Figure 5). Take care not to allow VL to drop below the 2.8V maximum under-voltage lockout threshold.

Changing SMBCLK and SMBDATA

Simultaneously

When clocking data into the MAX1601/MAX1604, SMB-DATA must not fall before SMBCLK. Otherwise, the MAX1601/MAX1604 may interpret this as a start condi-tion. Even when SMBDATA and SMBCLK fall at the

same instant, different fall times for the two signals may cause the erroneous generation of a start condition. To ensure that SMBDATA transitions after the falling edge of SMBCLK, add an RC network to SBMDATA (Figure 6).

Figure 5. Powering from Either VX or VY

Figure 6. Application with Cirrus Logic Interface

M A X 1601/M A X 1604

Dual-Channel CardBus and PCMCIA

Power Switches with SMBus? Serial Interface Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

16__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600?1996 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

________________________________________________________Package Information

__________________Pin Configuration

___________________Chip Information

TRANSISTOR COUNT: 4372