MAX1672CSLASHD datasheet(5/11 Pages) MAXIM

5 / 11 page

Step-Up/Down DC-DC Converter

in QSOP Package

_______________________________________________________________________________________

______________________________________________________________Pin Description

NAME

FUNCTION

Inductor Connection to the Drain of the Internal N-Channel Power MOSFET

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

µs/div

OUTPUT RIPPLE (HEAVY LOAD)

MAX1672-13

A: VOUT = 5V (20mV/div, AC COUPLED)

B: IL1 (500mA/div) (VIN = 2.7V, IOUT = 250mA)

µs/div

STARTUP DELAY

MAX1672-14

A: VOUT = (2V/div)

B: ONB (2V/div) (VIN = 2.7V, RLOAD = 50Ω)

200

µs/div

TURN-OFF DELAY

MAX1672-15

A: VOUT = (2V/div)

B: ONB (2V/div) (VIN = 2.7V, RLOAD = 50Ω)

PGND

Power Ground

ONB

On Control Input. When ONB = low or ONA = high, the IC is on. Connect ONB to GND for normal operation

(Table 1).

ONA

On Control Input. When ONA = low and ONB = high, the IC is off. Connect ONA to PS for normal operation

(Table 1).

3/5

Output Voltage Selection Input. Connect to PS for 3.3V output and to GND for 5V output. With VFB > 80mV,

the state of the 3/5 pin is ignored (Table 2).

PGI

Low-Battery Detector Input (1.25V threshold)

PGO

Low-Battery Detector Output (open drain). PGO pulls low when VPGI is greater than 1.25V.

ILIM

Inductor-Current-Limit Selection Input. Connect to PS for 0.8A current limit and to GND for 0.5A current limit.

OUT

Regulator Output. Drain of internal PFET linear regulator. Bypass with a 4.7µF capacitor to GND.

Feedback Input. For 3.3V or 5V output, connect to GND. For adjustable output, connect to feedback resistor-

divider network. With VFB > 70mV, the state of the 3/5 pin is ignored.

Bootstrapped Power Supply. Output of step-up switch-mode regulator and source of internal PFET linear

regulator. The IC is powered from this pin.

Input Voltage Sense Input. Connect to input supply.

REF

Reference Voltage Output. Bypass with a 0.1µF capacitor to GND.

GND

Analog Ground

PGND

Power Ground

Inductor Connection to the Drain of the Internal N-Channel Power MOSFET

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