Rainbow-electronics MAX1759 User Manual download pdf (Page 5)

MAX1759

Buck/Boost Regulating

Charge Pump in µMAX

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(Circuit of Figure 1, C

= 10µF, C

= 0.33µF, C

OUT

= 10µF, V

OUT

= 3.3V, V

= 2.5V, T

= +25°C, unless otherwise noted.)

NAME FUNCTION

1 POK

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

when V

falls below 1.1V. Connect a 10kΩ to 1MΩ pull-up resistor from POK to V

OUT

for a logic signal.

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

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.

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

8 CXP Positive Terminal of the Charge-Pump Transfer Capacitor

7 CXN Negative Terminal of the Charge-Pump Transfer Capacitor

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

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.

Pin Description

-4.2V

-2.5V

100µs/div

LINE-TRANSIENT RESPONSE

MAX1759 toc10

CH1: V

OUT

, 20mV/div, AC-COUPLED

CH2: V

, 1V/div, AC-COUPLED

LOAD

= 33Ω

500µs/div

TURN-ON/OFF RESPONSE

= 4.2V)

MAX1759 toc11

CH1: V

OUT

,1V/div

CH2: I

, 200mA/div

CH3: V

POK

, 5V/div

CH4: V

SHDN

, 5V/div

LOAD

= 33Ω

= 4.2V

500µs/div

TURN-ON/OFF RESPONSE

= 2.5V)

MAX1759 toc12

CH1: V

OUT

,1V/div

CH2: I

, 200mA/div

CH3: V

POK

, 5V/div

CH4: V

SHDN

, 5V/div

LOAD

= 33Ω

= 2.5V

1 2 3 4 5 6 7 8 9 10

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Rainbow-electronics MAX1759 User Manual Page 5

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