HT77S10 datasheet(1/16 Pages) HOLTEK

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HT77S10/HT77S11

High Efficiency Synchronous Step-Up DC/DC Converter

Selection Table

Part No.

Current Limit

Package

HT77S10

1.0A

8MSOP/SOP

HT77S11

0.55A

Rev. 1.00

1

February 3, 2010

Features

· Low start-up voltage: 0.7V (Typ.)

· High efficiency: HT77S10: 91% (Typ.)

at IOUT=200mA, VIN=2.4V, VOUT=3.3V

· High output voltage accuracy: ±4%

· Output voltage: 3.3V, 5.0V or Adjustable

· Low ripple and low noise

· Ultra low supply current: 20mA (Typ.)

· Low shutdown current: 1mA (Max.)

· Built-in voltage detector

· 8-pin MSOP/SOP packages

Applications

· Battery-powered equipment power source

· Power source for cameras, camcorders, VCRs,

PDAs, pagers, electronic data banks, and

hand-held communication equipment

· Power source for appliances, which require a higher

operating voltage than that of the application

batteries

General Description

The HT77S11 and HT77S10 are high efficiency PFM

synchronous step-up DC-DC converters. The two de-

vices although functionally similar are different in their

output drive current capabilities. Synchronous rectifica-

tion operation is used to increase device efficiency and

to reduce the external component resulting in reduced

product costs. The converter switching frequency, which

can have a value up to 500KHz, will vary according to

the load demands and according to the input voltage to

keep the output voltage at the required level.

The HT77S11 and HT77S10 have 0.7V start-up voltage,

and will consume a typical quiescent current of 20

mA. A

shutdown mode is provided whereby the operating cur-

rent will be reduced a very low value. The output voltage

has two fixed voltages of 3.3V by setting FB to OUT pin

and 5V by setting FB to GND pin, but can also be ad-

justed between a value of 1.8V~5.5V using two external

resistors. With internal voltage detector function, the de-

tected voltage can be set by using dividing resistor.

Số phần tương tự - HT77S10

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Mô tả tương tự - HT77S10

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