CYT2606E50T中文资料

PFM Step-Up DC-DC Converter

General Description

The CYT2606L Series are PFM step-up DC-DC converters with very low ripple noise due to the high operation frequency. The maximum operation frequency is 400KHz.

Only three components are required to realize the conversion from the battery voltage to a selected output voltage.

A driver pin (EXT) is provided for driving external power transistor to extend the output current capability where large current is required. Enable pin (EN) is also provided so that the circuit can be powered down.

Ordering Information

Features

400KHz Maximum Operation Frequency 2.0V to 5.0V Output Voltage With 0.1V Step Low Start-up Voltage: 0.8V at 1mA ±2% Output Voltage Accuracy Up to 88% Efficiency Output current: 300mA at 2.5V input, 3.3V output Low Ripple and Low Noise Output Current Extendable by External Switch

Applications

Power source for applications where a higher voltage than the battery voltage is required One to three cell battery devices Power source for cameras, camcorders, VCRs, PDAs, pagers and hand held communication instrument

Typical Applications

Block Diagram

bandgap

PFM control

OSC 400KHz

buffer

Error

Current limiting comparator

+

-Amplifier

VOUT

LX EXT

EN

Chip Enable

GND

+- 1.24V

Pin Assignment

Part Marking and Package Type

Pin Name

CYT2606L

LXXT SOT-23-3

CYT2606L

LXXF SOT-23-5

CYT2606L

LXXE SOT-89

CYT2606L

EXXT SOT-23-3

CYT2606L

EXXF SOT-23-5

CYT2606L

EXXE SOT-89

Description

LX 2 5 3 - - - Switching pin EXT -

-

-

2

5

3

Buffer output for external transistor

VOUT 3 2 2 3 2 2 Output voltage EN -

1

-

-

1

-

Chip enable (active high)

GND 1 4 1 1 4 1 Ground NC

- 3 - - 3 - No connection

Absolute Maximum Ratings

Type Symbol Description Value Unit

Vmax Maximum voltage on VOUT and VLX pins 8

V Voltage

Vmin-max

V oltage range on EXT and EN pins -0.3-VOUT+0.3 V ILXmax Maximum current on LX pin 1000 mA Current

IEXTmax

Maximum current on EXT pin

100 mA Psot-23-3 Maximum Power dissipation for SOT-23-3 package 0.25 W Psot-23-5 Maximum Power dissipation for SOT-23-5 package 0.25 W Power dissipation

Psot-89

Maximum Power dissipation for SOT-89 package 0.5 W

Tmin-max Operation temperature range -20-85 o

C Thermal

Tstorage

Storage temperature range -40-165 o

C

ESD

VESD

ESD voltage for human body mode

2000

V

Electronic Characteristics

Parameter Symbol Test Condition Min Typ Max Unit

Output voltage accuracy △VOUT -2 2 %

Maximum input voltage VIN MAX 0.7 VOUT V Start-up voltage V START ILOAD=1mA, VIN:0→2V 0.85 V Hold-on voltage

V HOLD ILOAD=1mA, VIN:2→0V

0.6 V

Maximum oscillation frequency F MAX 350 400 450 KHz

Oscillator duty cycle DC OSC 75 80 85 %

Efficiency η 85 88 %

Current limit

I LIMIT 600 800 1000 mA VIN=1.8V VOUT=3.0V 20 uA Input current at no load

IIN0

VIN=1.8V VOUT=5.0V

25

uA

Input standby current IINQ No load, EN=“low” 1 uA EN “High” voltage level

0.4*VOUT

V

EN “low” level

0.2 V

EN “high” input current 0.1 uA

EN “low” input current -0.1 uA

EXT output current

-5 5 mA

Typical Characteristics (Using Internal Switch Transistor)

Start-up/Hold-on vs. Output Current

00.511.522.531

10

100

1000

Output Current(mA)

S t a r t -u p /H o l d -o n V o l t a g e (V )

Start-up

Hold-on

L=47uH C=47uF

Output Voltage vs. Output Current

1.5

22.53

3.540

50

100

150

200

250

300

350

Output Current (mA)

O u t p u t V o l t a g e (V )

1V

1.5V

2V

2.5V

3V

L=47uH C=47uF VOUT=3.4V

Efficiency vs. Output Current

72

7476788082848688901

10

100

1000

Output Current(mA)

E f f i c i e n c y (%)

L=47uH C=47uF

VOUT=3.4V

1V 1.5V

2V

2.5V

3V

Output Current vs. Ripple Voltage

050100150200

2500

50100

150

200

250

300

350

Output Current (mA)

R i p p l e V o l t a g e (m V )

L=47uH C=47uF

VOUT=3.4V

1V

1.5V

2V

2.5V 3V

Output Current vs. Ripple Voltage

010203040506070800

50

100

150

200

250

300

350

Output Current (mA)

R i p p l e V o l t a g e (m V )L=47uH C=2*47uF VOUT=3.4V

1V

1.5V

2.5V

2V 3V

Output Current vs. Ripple Voltage

010

203040

50

60700

50

100

150

200

250

300

350

Output Current (mA)

R i p p l e V o l t a g e (m V )L=47uH C=3*47uF VOUT=3.4V

1V

1.5V

2V

2.5V

3V

CYT2606L

Package Information

Min Max Min Max A 1.050 1.2500.0410.049A10.0000.1000.0000.004A2 1.050 1.1500.0410.045B 0.3000.4000.0120.016c 0.1000.2000.0040.008D 2.820 3.0200.1110.119E 1.500 1.7000.0590.067E1 2.650 2.950

0.1040.116

e e1 1.800 2.000

0.0710.079

L L10.3000.6000.0120.024

?

0?8?0?8?

0.700REF 0.028REF Symbol Dimensions In Millimeters Dimensions In Inches

0.950TYP 0.037TYP

CYT2606 L

Min Max Min Max A 1.400 1.6000.0550.063b 0.3200.5200.0130.197b10.4000.5800.0160.023c 0.3500.4400.0140.017D 4.400

4.6000.173

0.181D1E 2.300 2.6000.0910.102E1 3.940

4.250

0.155

0.167

e e1L

0.900

1.2000.0350.047

Symbol 1.550 REF

0.061 REF 1.500 TYP 0.060TYP 3.000 TYP

0.118TYP