MAX1674 データシートの表示（PDF） - Maxim Integrated

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MAX1674

High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters

Maxim Integrated 

High-Efficiency, Low-Supply-Current,

Compact, Step-Up DC-DC Converters

Optional External Rectifier

Although not required, a Schottky diode (such as the

MBR0520) connected between LX and OUT allows

lower start-up voltages (Figure 10) and is recommend-

ed when operating at input voltages below 1.3V. Note

that adding this diode provides no significant efficiency

improvement.

PC Board Layout and Grounding

Careful printed circuit layout is important for minimizing

ground bounce and noise. Keep the IC’s GND pin and

the ground leads of the input and output filter capaci-

tors less than 0.2in (5mm) apart. In addition, keep all

connections to the FB and LX pins as short as possi-

ble. In particular, when using external feedback resis-

tors, locate them as close to the FB as possible. To

maximize output power and efficiency and minimize

output ripple voltage, use a ground plane and solder

the IC’s GND directly to the ground plane.

VIN

47µF

R1

200Ω BATT

LX

(MAX1676)

R3

OUT

MAX1674

MAX1675

FB

LBI MAX1676 SHDN

R4

0.1µF

CLSEL

(MAX1676)

LBO

REF

GND

22µH

MBR0520

0.1µF

47µF

R2

100k

LOW-BATTERY

OUTPUT

Figure 10. Adding a Schottky Diode for Low Input Voltage

Operation

Chip Information

TRANSISTOR COUNT: 751

Package Information

12 ______________________________________________________________________________________

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