MAX1649 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1649

5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers

Maxim Integrated 

5V/3.3V or Adjustable, High-Efficiency,

Low-Dropout, Step-Down DC-DC Controllers

SHDN

REF

MAX1649

MAX1651

V+

ERROR

COMPARATOR

FB

DUAL-MODE™

COMPARATOR

50mV

OUT

MINIMUM

Q OFF-TIME TRIG

ONE-SHOT

MAXIMUM

TRIG ON-TIME Q

ONE-SHOT

1.5V

REFERENCE

N

FROM V+

EXT

S

Q

F/F

R

CURRENT

CS

COMPARATOR

110mV

GND

FROM V+

Figure 2. Block Diagram

Shutdown Mode

When SHDN is high, the MAX1649/MAX1651 enter shut-

down mode. In this mode, the internal biasing circuitry is

turned off (including the reference) and the supply cur-

rent drops to less than 5µA. EXT goes high, turning off the

external MOSFET. SHDN is a logic-level input. Connect

SHDN to GND for normal operation.

Quiescent Current

In normal operation, the device's typical quiescent cur-

rent is 78µA. In an actual application, even with no load,

additional current is drawn to supply external feedback

resistors (if used) and the diode and capacitor leakage

currents. In the circuit of Figure 1, with V+ at 5V and

VOUT at 3.3V, typical no-load supply current for the

entire circuit is 90µA.

Dual Mode is a trademark of Maxim Integrated Products, Inc.

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