Rainbow-electronics MAX608 Manual de usuario descargar pdf (Pagina 6)

MAX608

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

3 FB

4 SHDN

5 REF

6 AGND Analog Ground

7 GND High-Current Ground Return for the Output Driver

8 CS

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

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, V

OUT

is a diode drop

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

ground for normal operation.

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

The reference is disabled in shutdown.

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

and AGND.

1.5V

REFERENCE

Q TRIG

F/F

QTRIG

LOW-VOLTAGE

OSCILLATOR

2.5V

0.1V

MAX ON-TIME

ONE-SHOT

MIN OFF-TIME

ONE-SHOT

CURRENT-SENSE

AMPLIFIER

DUAL-MODE

COMPARATOR

REF

50mV

ERROR

COMPARATOR

SHDN

OUT

LOW-VOLTAGE

START-UP

COMPARATOR

EXT

BIAS

CIRCUITRY

MAX608

2.3µs

16µs



Figure 1. Functional Diagram

1 2 3 4 5 6 7 8 9 10 11 12

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Rainbow-electronics MAX608 Manual de usuario Pagina 6

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