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LP6483S 车充降压IC

LP6483S 350KHz, 36V/3A Step-down Converter With Soft-Start

General Description

The LP6483S contains an independent 350KHz constant frequency, current mode, PWM step-down converters. The converter integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. The LP6483S is ideal for powering portable equipment that runs from a 2cell Lithium-Ion (Li+) battery. The converter can supply 3000mA of load current from a 4.5V to 30V input voltage. The output voltage can be regulated as low as 0.923V. The LP6483S can also run at 100% duty cycle for low dropout applications.

The LP6483S is available in a SOP8 and ESOP8 package and is rated over the -40°C to 85°C temperature range.

Order Information

LP6483S

□ □ □

F: Pb-Free

Package Type

SO: SOP-8

SP: ESOP-8(Exposed Pad)

Typical Application Circuit VIN

Features

?Input Voltage Range: 4.5V to 30V

?Output Voltage Range: 0.923V to 12V

?3000mA Load Current on Channel

?Up to 94% Efficiency

?90% Duty Cycle in Dropout

?<1u A Quiescent Current

?350KHz Switching Frequency

?Soft star Function

?Short Circuit Protection

?Current Mode Operation

?Thermal Fault Protection

?S O P-8a n d E S O P-8 Package

?RoHS Compliant and 100% Lead (Pb)-Free

Applications

?Portable Media Players

?Cellular and Smart mobile phone

?PDA/DSC

?GPS Applications

Marking Information

Device Marking Package Shipping LP6483S LPS

LP6483S

XXX

SO:SOP-8

SP:ESOP-8

3K/REEL mr you 136********

Typical Application Circuit

VIN

LP6483S(SOP-8) application circuit

U3VIN

LP6483S(ESOP-8) application circuit

Functional Pin Description

SOP-8(Top View) E SOP-8(Top View) Pin Description

Pin NO PIN DESCRIPTION

1 BS High-Side Gate Drive Boost Input. Connect a 0.01uF or greater capacitor from SW to BS to power the high side switch.

2 Vin Supply Input.

3 SW Switch Mode Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches.

4 GND Ground.

5 FB Feedback Input. Connect FB to the center point of the external resistor divider. Normal voltage for this pin is 0.923V.

6 COMP Loop compensation input. Connect a series RC network from COMP to GND to Compensate the regulation control loop.

7 EN Enable Control Input. Drive EN above 2.5V to turn on the Channel. Drive EN below 0.3V to turn it off (shutdown current < 0.1μA).

8 SS Soft-start control input. Connect an external capacitor to program the soft-start.if unused, leave it open, which means internal soft-start function.

9 E-Pad Exposed Pad. The pin connect to GND.

Function Block Diagram

Absolute Maximum Ratings

?Input Voltage to GND ----------------------------------------------------------------------------------------------------------------- 36V

?SW to GND (VSW) ------------------------------------------------------------------------------------------------- -0.3V to VIN +0.3V

?FB to GND (VFB) --------------------------------------------------------------------------------------------------- -0.3V to VIN +0.3V

?EN to GND (VEN) ------------------------------------------------------------------------------------------------------------ -0.3V to 6V

?Operating Junction Temperature Range (TJ) ------------------------------------------------------------------ -40℃ to 150℃

?Maximum Soldering Temperature (at leads, 1 0sec) ----------------------------------------------------------------------260℃

Electrical Characteristics (VIN =VEN, typical values are TA=25℃ )

Symbol Parameter Conditions

LP6483S

Unit Min. Typ. Max.

Step-Down Converter

VIN Input Voltage 4.5 36 V

△VOUT Output Voltage Line Regulation ILOAD = 0

VIN = 2.5V to 5.5V

0.25 0.4 %/v

△VFB Reference Voltage

Line Regulation

VIN = 2.5V to 5.5V 0.25 0.4 %/v

VOUT Output Voltage Range 0.923 12 V IQ Quiescent Current VFB =0V,VIN1/IN2=4.2V 450 900 μA ISHDN Shutdown Current EN = GND 1 μA ILIM P-Channel Current Limit 4 A

RDS(ON)H High-Side Switch On Resistance 170 m

RDS(ON)L Low-Side Switch On Resistance 120 m

ILXLEAK LX Leakage Current

VEN1/EN2=0V,

VSW1/SW2=0 or 5V, VIN1/IN2=5V

1 μA

ΔVLine-reg/ΔVIN Line Regulation VINB = 2.8V to 5.5V 0.2 0.4 %/V

VFB Feedback Threshold Voltage

Accuracy

VINB = 3.6V,LP6483SAQVF 0.895 0.923 0.951 V

IFB FB Leakage Current VOUTB = 1 .0V 30 nA FOSC

Oscillator Frequency 300 350 400 KHz TS Startup Time From Enable to Output Regulation 120 μs

TSD Over-Temperature Shutdown

Threshold

150 ℃

THYS Over-Temperature Shutdown

Hysteresis

20 ℃

VEN(L) Enable Threshold Low 0.4 V VEN(H) Enable Threshold High 2.5 6 V IEN Input Low Current VINB = VENB = 5.5V -1 1 μA Note: Output Voltage: Vout = VFB X (1+R2/R1) Volts;

Typical Operating Characteristics

Packaging Information

SOP-8(LP6483SASOF)

ESOP-8(LP6483SASPF)

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