Rainbow-electronics MAX684 User Manual download pdf (Page 5)

MAX682/MAX683/MAX684

3.3V-Input to Regulated 5V-Output

Charge Pumps

_______________________________________________________________________________________ 5

2ms/div

LOAD-TRANSIENT RESPONSE

MAX682 TOC19

A: LOAD CURRENT: I

LOAD

= 5mA TO 250mA, 500mA/div

B: OUTPUT VOLTAGE: SKIP = HIGH, I

SHDN

= 22µA,

100mV/div, MAX682

100µs/div

SHUTDOWN TIMING

MAX682 TOC18

A: OUTPUT VOLTAGE: SKIP = HIGH, R

= 5V / I

MAX

, 2V/div

B: SHDN VOLTAGE: 1V/div

2ms/div

LINE-TRANSIENT RESPONSE

MAX682 TOC20

A: INPUT VOLTAGE: V

= 3.1V TO 3.6V, 500mV/div

B: OUTPUT VOLTAGE: SKIP = HIGH, I

SHDN

= 22µA,

LOAD

= 250mA, 50mV/div, MAX682

Typical Operating Characteristics (continued)

(Circuit of Figure 5, V

= 3.3V, component values from Tables 2 and 3, T

= +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 R

EXT

, the device activates, and the SHDN pin input current sets the

oscillator’s switching frequency. R

EXT

(kΩ) = 45000 (V

- 0.69V) / f

OSC

(kHz).

3 IN

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).

4 GND Ground Pin. Connect to PGND through a short trace.

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

7 CXP Positive Terminal of the Charge-Pump Transfer Capacitor

6 CXN Negative Terminal of the Charge-Pump Transfer Capacitor

5 PGND Power Ground Pin

1 2 3 4 5 6 7 8 9 10 11 12

MAX682/MAX683/MAX684 1
Charge Pumps 1

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Rainbow-electronics MAX684 User Manual Page 5

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