MAX1771 Просмотр технического описания (PDF) - Maxim Integrated

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MAX1771

12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller

Maxim Integrated 

12V or Adjustable, High-Efficiency,

Low IQ, Step-Up DC-DC Controller

____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 2a, TA = +25°C, unless otherwise noted.)

ENTERING/EXITING SHUTDOWN

A

0V

B

5V

0V

IOUT = 500mA, VIN = 5V

A: SHDN, 5V/div

B: VOUT, 5V/div

2ms/div

______________________________________________________________Pin Description

PIN

NAME

FUNCTION

1

EXT

Gate Drive for External N-Channel Power Transistor

2

V+

Power-Supply Input. Also acts as a voltage-sense point when in bootstrapped mode.

3

FB

Feedback Input for Adjustable-Output Operation. Connect to ground for fixed-output operation.

Use a resistor divider network to adjust the output voltage. See Setting the Output Voltage section.

Active-High TTL/CMOS Logic-Level Shutdown Input. In shutdown mode, VOUT is a diode drop

4

SHDN

below V+ (due to the DC path from V+ to the output) and the supply current drops to 5µA

maximum. Connect to ground for normal operation.

5

REF

1.5V Reference Output that can source 100µA for external loads. Bypass to GND with 0.1µF.

The reference is disabled in shutdown.

6

AGND

Analog Ground

7

GND

High-Current Ground Return for the Output Driver

8

CS

Positive Input to the Current-Sense Amplifier. Connect the current-sense resistor between CS

and GND.

6 _______________________________________________________________________________________

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