MAX1759EUB 查看數據表（PDF） - Maxim Integrated

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MAX1759EUB

Buck/Boost Regulating Charge Pump in µMAX

Maxim Integrated 

Buck/Boost Regulating

Charge Pump in µMAX

Typical Operating Characteristics (continued)

(Circuit of Figure 1, CIN = 10µF, CX = 0.33µF, COUT = 10µF, VOUT = 3.3V, VIN = 2.5V, TA = +25°C, unless otherwise noted.)

LINE-TRANSIENT RESPONSE

RLOAD = 33Ω

TURN-ON/OFF RESPONSE

(VIN = 4.2V)

RLOAD = 33Ω

VIN = 4.2V

TURN-ON/OFF RESPONSE

(VIN = 2.5V)

RLOAD = 33Ω

VIN = 2.5V

1

2

100µs/div

CH1: VOUT, 20mV/div, AC-COUPLED

CH2: VIN, 1V/div, AC-COUPLED

-4.2V

-2.5V

1

2

3

4

500µs/div

CH1: VOUT,1V/div

CH2: IIN, 200mA/div

CH3: VPOK, 5V/div

CH4: VSHDN, 5V/div

1

2

3

4

500µs/div

CH1: VOUT,1V/div

CH2: IIN, 200mA/div

CH3: VPOK, 5V/div

CH4: VSHDN, 5V/div

Pin Description

PIN NAME

FUNCTION

Open-Drain Power-OK Output. POK is high impedance when output voltage is in regulation. POK sinks current

1

POK

when VFB falls below 1.1V. Connect a 10kΩ to 1MΩ pull-up resistor from POK to VOUT for a logic signal.

Ground POK or leave unconnected if not used. POK is high impedance in shutdown.

2

SHDN

Shutdown Input. Drive high for normal operation; drive low for shutdown mode. OUT is high impedance in

shutdown.

3, 4

IN

Input Supply. Connect both pins together and bypass to GND with a ceramic capacitor (see Capacitor

Selection section).

5

GND Ground. Connect GND to PGND with a short trace.

6

PGND Power Ground. Charge-pump current flows through this pin.

7

CXN Negative Terminal of the Charge-Pump Transfer Capacitor

8

CXP

Positive Terminal of the Charge-Pump Transfer Capacitor

9

OUT Power Output. Bypass to GND with an output filter capacitor.

10

FB

Dual-Mode Feedback. Connect FB to GND for 3.3V output. Connect to an external resistor divider to adjust

the output voltage from 2.5V to 5.5V.

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