MAX608ESA 데이터 시트보기 (PDF) - Maxim Integrated

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MAX608ESA

5V or Adjustable, Low-Voltage, Step-Up DC-DC Controller

Maxim Integrated 

5V or Adjustable, Low-Voltage,

Step-Up DC-DC Controller

______________________________________________________________Pin Description

PIN

NAME

FUNCTION

1

EXT

Gate Drive for External N-Channel Power Transistor

2

OUT

Power-Supply and Voltage-Sense Input. Always connect OUT to circuit output.

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 the input voltage (due to the DC path from the input voltage to the output). 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 AGND.

REF

FB

DUAL-MODE

COMPARATOR

1.5V

REFERENCE

MIN OFF-TIME

ONE-SHOT

Q TRIG

2.3µs

F/F

S

Q

R

MAX ON-TIME

ONE-SHOT

TRIG Q

16µs

ERROR

COMPARATOR

LOW-VOLTAGE

OSCILLATOR

CURRENT-SENSE

AMPLIFIER

50mV

MAX608

BIAS

CIRCUITRY

LOW-VOLTAGE

START-UP

COMPARATOR

N

2.5V

0.1V

SHDN

OUT

EXT

CS

Figure 1. Functional Diagram

6 _______________________________________________________________________________________

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