Low-Profile, 5V/12V or Adjustable, Step-Up

DC-DC Converters for Flash Memory/PCMCIA Cards

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7

Pin Description

Standard Application Circuits

This data sheet provides two predesigned standard

application circuits. The circuit of Figure 1 produces 12V

at 120mA from a 5V input. Table 1 lists component val-

ues and part numbers for both the MAX606 and MAX607

variations of this circuit. The circuit of Figure 2 produces

5V at a typical output current of 180mA from a 3.3V

input. Each application circuit is designed to deliver the

full rated output load current over the temperature range

listed. Component values and part numbers for this cir-

cuit are listed in Table 2. See Table 3 for component

suppliers’ phone and fax numbers.

C1

C2

C3

D1

C4

MAX606

MAX607

LX

OUT

SHDN

SS

FB

GND

PGND

IN

ON/OFF

OUTPUT

12V @ 120mA

+5V

INPUT

L1

C1

D1

L1

C2

C3

C4

MAX606

MAX607

LX

OUT

SHDN

SS

GND

PGND

IN

FB

ON/OFF

OUTPUT

5V @ 180mA

+3.3V

INPUT

Figure 1. 12V Standard Application Circuit

Figure 2. 5V Standard Application Circuit

NAME

FUNCTION

1

PGND

Power Ground. Source of n-channel power MOSFET.

2

FB

Feedback Input. Connect to IN for 5V output, to GND for 12V output, or to a resistive voltage divider between

OUT and GND for an adjustable output between IN and 12.5V.

PIN

3

SHDN

Shutdown Input, Active Low. Connect to GND to power down or to IN for normal operation. Output power FET

is held off when SHDN is low.

4

IN

Supply Voltage Input: 3.0V to 5.5V

8

LX

Drain of n-channel power MOSFET

7

OUT

Output. Always connect directly to the circuit output.

6

SS

Soft-Start Input

5

GND

Analog Ground