LT1308BIS8 Просмотр технического описания (PDF) - Linear Technology

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LT1308BIS8

High Current, Micropower Single Cell, 600kHz DC/DC Converters

Linear Technology 

LT1308A/LT1308B

BLOCK DIAGRAMS

VIN

6

VOUT

R1

(EXTERNAL)

FB

FB

2

R2

(EXTERNAL)

VIN

VIN

R5

R6

40k

40k

+

Q4

VC

2VBE

SHUTDOWN

SHDN

3

gm

1

–

ERROR

+

LBI

7+

LBO

Q1

AMPLIFIER

Q2

*

ENABLE

8

×10

R3

BIAS –

A1

200mV

–

A4

30k

COMPARATOR

SW

R4

140k

RAMP

GENERATOR

–

+

Σ

+

+

A2

FF

DRIVER

5

R

Q

Q3

S

600kHz

OSCILLATOR

*HYSTERESIS IN LT1308A ONLY

A=3

0.03Ω

4

GND

1308 BD2a

Figure 2a. LT1308A/LT1308B Block Diagram (SO-8 Package)

VIN 11

VIN 12

R5

40k

VOUT

R1

(EXTERNAL)

FB

Q1

FB

2

R2

(EXTERNAL)

VIN

VIN

R6

40k

+

gm

–

ERROR

AMPLIFIER

Q2

×10

R3

30k

R4

140k

RAMP

GENERATOR

Q4

2VBE

VC

1

BIAS

+

Σ

+

SHUTDOWN

+

*

–

A1

LBI

13 +

ENABLE

–

200mV

COMPARATOR

–

FF

+

A2

R

Q

S

A4

DRIVER

600kHz

OSCILLATOR

A=3

*HYSTERESIS IN LT1308A ONLY

Figure 2b. LT1308A/LT1308B Block Diagram (TSSOP Package)

SHDN

3

LBO

14

SW SW SW

8 9 10

Q3

0.03Ω

4567

GND GND GND GND 1308 BD2b

1308abfb

7

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