MAX682 datasheet(5/12 Pages) MAXIM

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3.3V-Input to Regulated 5V-Output

Charge Pumps

_______________________________________________________________________________________

2ms/div

LOAD-TRANSIENT RESPONSE

MAX682 TOC19

A: LOAD CURRENT: ILOAD = 5mA TO 250mA, 500mA/div

B: OUTPUT VOLTAGE: SKIP = HIGH, ISHDN = 22µA,

100mV/div, MAX682

100

µs/div

SHUTDOWN TIMING

MAX682 TOC18

A: OUTPUT VOLTAGE: SKIP = HIGH, RL = 5V / IMAX, 2V/div

B: SHDN VOLTAGE: 1V/div

2ms/div

LINE-TRANSIENT RESPONSE

MAX682 TOC20

A: INPUT VOLTAGE: VIN = 3.1V TO 3.6V, 500mV/div

B: OUTPUT VOLTAGE: SKIP = HIGH, ISHDN = 22µA,

ILOAD = 250mA, 50mV/div, MAX682

Typical Operating Characteristics (continued)

(Circuit of Figure 5, VIN = 3.3V, component values from Tables 2 and 3, TA = +25°C, unless otherwise noted.)

Pin Description

NAME

FUNCTION

SKIP

When SKIP = low, the regulator operates in low-quiescent-current skip mode. When SKIP = high, the

regulator operates in constant-frequency mode, minimizing output ripple and noise. SKIP must be tied

high for input voltages above 3.6V.

SHDN

Shutdown Input. Drive SHDN through an external resistor. When SHDN = low, the device turns off. When

current is sourced into SHDN through REXT, the device activates, and the SHDN pin input current sets the

oscillator’s switching frequency. REXT (kΩ) = 45000 (V IN - 0.69V) / fOSC (kHz).

Input Supply Pin. Can range from 2.7V to 5.5V for SKIP = high, and 2.7V to 3.6V for SKIP = low. Bypass to

PGND with a suitable value capacitor (see

Capacitor Selection section).

GND

Ground Pin. Connect to PGND through a short trace.

OUT

Fixed 5V Power Output. Bypass to PGND with output filter capacitor.

CXP

Positive Terminal of the Charge-Pump Transfer Capacitor

CXN

Negative Terminal of the Charge-Pump Transfer Capacitor

PGND

Power Ground Pin

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