PowTech PT1301E23F, PT1301E89E Schematic [ru]

PT1301

High Efficiency

Low Voltage Step-up DC/DC Converter

GENERATION DESCRIPTION

The PT1301 is a compact, high efficiency, and low
voltage step-up DC/DC converter with an Adaptive
Current Mode PWM control loop. It comprises of an
error amplifier, a ramp generator, a PWM comparator, a
switch pass element and the driver. It provides stable
and high efficient operation over a wide range of load
currents without external compensation. The below 1V
start-up input voltage makes PT1301 suitable for single
battery cell applications. The built-in power transistor is
able to provide up to 300mA output current while
working under Li-Battery Supply. Besides, it provides
extra pin to drive external power devices (NMOS or
NPN ) in case higher output current is needed. The
output voltage is set with two external resistors. The
500KHz high switching rate reduces the size of external
components. Besides, the 14μA low quiescent current
together with high efficiency maintains long battery
lifetime.

OREER INFORMATION

FEATURES

z Low Quiescent (Switch-off) Supply Current: 14μA
z Low Start-up Input Voltage: typical 0.8V
z High Supply Capability: Deliver 3.3V 100mA with

1Alkaline Cell; 5V 300mA with 1 Li-Cell

z Zero Shutdown Mode Supply Current
z High efficiency: 90%
z Fixed switching frequency: 500KHz
z Options for internal or external power switches
z Package type: SOT-26, SOT-89-5

APPLICATIONS

z MP3, PDA, Electronic
z Dictionary, DSC, LCD, RF-Tag,
z Portable Devices, Wireless Devices, etc.

TYPICAL APPLICATION CIRCUITS

(1) T ypical Application

1.5Vto 3.3V, 100mA Output Current, typically for MP3 Application.

China Resources Powtech (Shanghai) Limited WWW.CRPOWTECH.COM Page 1

PT1301_DS Rev EN_3.2

PT1301

High Efficiency

Low Voltage Step-up DC/DC Converter

(2) Extending Output Current

1.5V to 3.3V, 250mA Output Current

(3) High Output Voltage, Large Output Current

5V to 12V, 300mA Output Current

China Resources Powtech (Shanghai) Limited WWW.CRPOWTECH.COM Page 2

PT1301_DS Rev EN_3.2

PT1301

High Efficiency

Low Voltage Step-up DC/DC Converter

PIN ASSIGNMENT

PIN DESCRIPTION

SOT-26

1

2

3

4

5

6

PIN No

SOT-89-5

1 CE Enable pin. PT1301 Shut-down when CE is low

EXT Output pin for driving external power transistor

5 GND Ground

4 LX Output for internal power switch

2 VDD Power Supply

3 FB Feed back input

SYMBOL DESCRIPTTION

ABSOLUTE MAXIMUM RATINGS (Note 1)

SYMBOL ITEM RA TING UNIT

VDD Supply Voltage -0.3~7.0V V

VLX LX pin Switch Voltage -0.3~7.0V V

VIO Voltage on other I/O pins -0.3V to (VDD+0.3V)

I

LX pin Output Current 2.5 A

OUT

I

EXT pin Drive Current 200 mA

EXT

PTR1 Package Thermal Resistance SOT-26, ΘJC 145 W/℃

PTR2 Package Thermal Resistance SOT-89-5, ΘJC 45 W/℃

T

Operating Temperature Range -40~125 ℃

OPT

T

Storage Temperature Range -65~150 ℃

STG

T

Lead Temperature (Soldering) 260℃, 10s

SOLDER

Note1: Absolute Maximum Ratings are threshold limit values that must not be exceeded even for an instant under

any condition. Moreover, such values for any two items must not be reached simultaneously. Operation above these

absolute maximum ratings may cause degradation or permanent damage to the device. These are stress ratings only

and do not necessarily imply functional operation below these limits.

China Resources Powtech (Shanghai) Limited WWW.CRPOWTECH.COM Page 3

PT1301_DS Rev EN_3.2