CMOS Micropower Step-Up

Switching Regulator

12

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Table 2. Maxim DC-DC Converters

MAX634

MAX630

150

μF

NEG OUT

-12V, 15mA

250

μH

1N914

R3

100k

Ω

R4

100k

Ω

5

8

7

6

N.C.

GND

4

3

LBD

2

150pF

68pF

2

LBD

8

LBR

1

100pF

47pF

4

GND

6

R6

18k

Ω

R5

100k

Ω

5

3

500

μH

7

IN914

R1

82k

Ω

R2

10k

Ω

330

μF

INPUT, 9V BATTERY

POS OUT

+12V, 45mA

DEVICE

DESCRIPTION

INPUT VOLTAGE

OUTPUT VOLTAGE

COMMENTS

ICL7660

Charge-Pump Voltage Inverter

1.5V to 10V

Not regulated

MAX4193

DC-DC Boost Converter

2.4V to 16.5V

RC4193 2

MAX630

DC-DC Boost Converter

2.0V to 16.5V

Improved RC4191 2

MAX631

DC-DC Boost Converter

1.5V to 5.6V

+5V

Only 2 external components

MAX632

DC-DC Boost Converter

1.5V to 12.6V

+12V

Only 2 external components

MAX633

DC-DC Boost Converter

1.5V to 15.6V

+15V

Only 2 external components

MAX4391

DC-DC Voltage Inverter

4V to 16.5V

Up to -20V

RC4391 2

MAX634

DC-DC Voltage Inverter

2.3V to 16.5V

Up to -20V

Improved RC4391 2

MAX635

DC-DC Voltage Inverter

2.3V to 16.5V

-5V

Only 3 external components

MAX636

DC-DC Voltage Inverter

2.3V to 16.5V

-12V

Only 3 external components

MAX637

DC-DC Voltage Inverter

2.3V to 16.5V

-15V

Only 3 external components

MAX638

DC-DC Voltage Step-Down

3V to 16.5V

Only 3 external components

MAX641

High-Power Boost Converter

1.5V to 5.6V

+5V

Drives external MOSFET

MAX642

High-Power Boost Converter

1.5V to 12.6V

+12V

Drives external MOSFET

MAX643

High-Power Boost Converter

1.5V to 15.6V

+15V

Drives external MOSFET

Figure 8. ±12V Dual-Tracking Regulator