LTC3499B 데이터 시트보기 (PDF) - Linear Technology

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LTC3499B

750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection

Linear Technology 

FUNCTIONAL BLOCK DIAGRAM

VIN +

CIN

1.8V TO 5.5V

L

REVERSE-BATTERY COMPARATOR

2

VIN

ANTI-RING

250Ω

3

SW

+

0.7V

–

1 = CLOSED

1 = CLOSED

VOUT

6.8V

OV COMPARATOR

+

1 = OFF

–

ENABLE

THERMAL SD

SLEEP

PWM

LOGIC

AND

DRIVERS

LTC3499/LTC3499B

VSELECT

ERROR AMPLIFIER

VOUT 6

1.22V

CFF

(OPTIONAL)

FB

7

R1

COUT

R2

IZERO

1.2MHz

OSCILLATOR

SLOPE

COMPENSATION

Σ

SHDN –

1

+

0.8V

PWM COMPARATOR

CURRENT LIMIT COMPARATOR

REFERENCE

BIAS

UVLO

SD

ENABLE

SLEEP

1A

TYP

Burst Mode

CONTROL

(LTC3499 ONLY)

ENABLE

TSD

GND

4

Figure 1: Functional Block Diagram

VC

8

CC1

CC2

RZ

3µA

SS

5

5k

CSS

3499 F01

3499fc

7

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