MAX4193 查看數據表（PDF） - Maxim Integrated

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MAX4193

CMOS Micropower Step-Up Switching Regulator

Maxim Integrated 

CMOS Micropower Step-Up

Switching Regulator

Note that this circuit (with or without the MAX8212) can be

used to provide 5V from four alkaline cells. The initial volt-

age is approximately 6V, and the output is maintained at

5V even when the battery voltage falls to less than 2V.

Dual-Tracking Regulator

A MAX634 inverting regulator is combined with a

MAX630 in Figure 8 to provide a dual-tracking ±15V

output from a 9V battery. The reference for the -15V

output is derived from the positive output through R3

and R4. Both regulators are set to maximize output

power at low-battery voltage by reducing the oscillator

frequency, through LBR, when VBATT falls to 7.2V.

LX 470μH

1N4148

+5V OUT

3

3V

LX

470μF

15V

R3

249kΩ

MAX630

1 LBR

R4

499kΩ

+VS 5

IC 6

VFB 7

R1

540kΩ

LBD CX GND

8

2

4

C1

100pF

R2

200kΩ

CX

47pF

LINE-POWERED

+5V INPUT

1N4001

470μH

UNINTERRUPTABLE

1N5817 +5V OUTPUT

1N5817

3.6V

NICAD

BATTERY

680Ω

200kΩ

100kΩ

3

LX

MAX630

1 LBR

+VS 5

IC 6

8 LBD

VFB 7

GND

CX

4

2

47pF

470μF

15V

280kΩ

100kΩ

POWER FAIL

Figure 5. 3V to 5V Converter with Low-Battery Frequency Shift

Figure 6. Uninterruptable +5V Supply

2.4MΩ

9V

BATTERY

8

10MΩ

MAX8212

2 HYST

OUT

3 THRESHOLD

390kΩ

GND

5

1.0mH

3

LX

1.3MΩ

MAX630

1

LBR

1MΩ

5

+VS

6

IC

VFB 7

1MΩ

LBD

CX

GND

8

2

4

100pF

47pF

470μF

25V

2MΩ

560kΩ

Figure 7. Battery Life Extension Down to 3V In

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