ML4950 Просмотр технического описания (PDF) - Micro Linear Corporation

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ML4950

Adjustable Output, Low Current Single Cell Boost Regulator with Detect

Micro Linear Corporation 

ML4950

VIN

100µF

27µH

(Sumida CD75)

ML4950

VIN PWR GND

GND

RESET

SENSE

DETECT

VL

VOUT

464kΩ

0.1%

100µF

IOUT

VOUT

40.2kΩ

0.1%

Figure 1. Application Test Circuit.

L1

VIN

6

VL

START-UP

SQ

RQ

Q1

5µs

ONE SHOT

Q2

A2

A1

VREF

VOUT

5

SENSE

3

+

C1 VOUT

–

R1

R2

Figure 2. PFM Regulator Block Diagram.

INDUCTOR

CURRENT

Q(ONE SHOT)

Q2

Q1 ON

ON

Q1 & Q2 OFF

Q2

Q1 ON ON

Figure 3. PFM Inductor Current Waveforms and Timing.

4

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