ML4851 Datasheet

IC型號：
ML4851
PDF描述：
Micro Linear Corporation [Low Current, Voltage Boost Regula...
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芯片廠家：
MICRO-LINEAR

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FEATURING

Extended Commercial Temperature Range

-20藲C to 70藲C

for Portable Handheld Equipment

ML4851*

Low Current, Voltage Boost Regulator

GENERAL DESCRIPTION

The ML4851 is a low power boost regulator designed for

DC to DC conversion in 1 to 3 cell battery powered

systems. The maximum switching frequency can exceed

100kHz, allowing the use of small, low cost inductors.

The combination of BiCMOS process technology, internal

synchronous rectification, variable frequency operation,

and low supply current make the ML4851 ideal for 1 cell

applications. The ML4851 is capable of start-up with input

voltages as low as 1V and is available in 5V and 3.3V

output versions with output voltage accuracy of 鹵3%.

An integrated synchronous rectifier eliminates the need

for an external Schottky diode and provides a lower

forward voltage drop, resulting in higher conversion

efficiency. In addition, low quiescent battery current and

variable frequency operation result in high efficiency

even at light loads. The ML4851 requires only one

inductor and two capacitors to build a very small

regulator circuit capable of achieving conversion

efficiencies in excess of 90%.

The circuit also contains a

RESET

output which goes low

when the IC can no longer function due to low input

voltage, or when the DETECT input drops below 200mV.

FEATURES

Guaranteed full load start-up and operation at 1V input

Maximum switching frequency > 100kHz

Pulse Frequency Modulation (PFM) and internal

synchronous rectification for high efficiency

Minimum external components

Low ON resistance internal switching FETs

Micropower operation

5V and 3.3V output versions

*Some Packages Are Obsolete

BLOCK DIAGRAM

DETECT

VREF

VIN

鈥?/div>

COMP

RESET

START-UP

VOUT

鈥?/div>

5碌s

ONE SHOT

PWR

GND

鈥?/div>

VREF

REFERENCE

VREF

GND

VREF

July, 2000

DATASHEET

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