LT1304 查看數據表（PDF） - Linear Technology

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LT1304

Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown

Linear Technology 

BLOCK DIAGRA S

LT1304/LT1304-3.3/LT1304-5

LB0

2

VIN +

C1

L1

VIN

3

D1 +

SW

4

VOUT

C2

LBI

1

+

–

A3

1.17V

R3

FB

8

R4

–

A1

+

ENABLE

1.5V

UNDERVOLTAGE

LOCKOUT

A2

36mV

R2

1k

BIAS

OFF ~1V

Q3

TIMERS

6µs ON

1.5µs OFF

1k

DRIVER

R1

7.2Ω

Q2

×1

Q1

×200

1.24V

VREF

SHUTDOWN

SHDN

7

6 ILIM

GND

5

1304 F01

Figure 1. LT1304 Block Diagram. Independent Low-Battery Detector A3 Remains Alive When Device Is in Shutdown

LBI

LB0

1

2

VIN

SW

3

4

SENSE

8

590k

R1

+

–

A3

1.17V

1.5V

UNDERVOLTAGE

LOCKOUT

A2

36mV

R2

1k

BIAS

OFF

~1V

Q3

–

A1

+

ENABLE

TIMERS

6µs ON

1.5µs OFF

1k

DRIVER

R1

7.2Ω

Q2

×1

Q1

×200

1.24V

VREF

R1 = 355k (LT1304-3.3), 195k (LT1304-5)

SHUTDOWN

SHDN

7

6 ILIM

GND

5

1304 F02

Figure 2. LT1304-3.3/LT1304-5 Block Diagram

5

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