1.5A, 280kHz, Boost Regulator

LM5171

Dec. 2010 - Rev. 1.2.1

- 2

-

HTC

ABSOLUTE MAXIMUM RATINGS*

Pin Name

Pin Symbol

IC Power Input

Vcc

30 V

- 0.3 V

N / A

200 mA

Shutdown / Sync

SS

30 V

- 0.3 V

1.0 mA

1.0 mA

Loop Compensation

Vc

6.0 V

- 0.3 V

10 mA

10 mA

Voltage Feedback Input

FB

10 V

- 0.3 V

1.0 mA

1.0 mA

Test Pin

Test

6.0 V

- 0.3 V

1.0 mA

1.0 mA

Power Ground

PGND

0.3 V

- 0.3 V

4.0 A

1.0 mA

Analog Ground

AGND

0 V

0 V

N / A

10 mA

Switch Input

Vsw

40 V

- 0.3 V

10 mA

3.0 A

* Operating Ratings indicate conditions for which the device is intended to be but do not guarantee specific performance limits. For guaranteed

specifications, see the Electrical Characteristics.)

BLOCK DIAGRAM

R

Oscillator

Thermal

Shutdown

Frequency

Shift 5:1

2.0V

Regulator

Delay

Timer

Sync

Driver

0.4V Detector

63mΩ

Shutdown

Error Amp

1.276V

PWM

Comparator

-

+

SQ

Switch

x 5

Ramp

Summer

SS

Test

FB

AGND

PGND