MAX1642CSLASHD datasheet(2/12 Pages) MAXIM

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High-Efficiency, Step-Up

DC-DC Converters for 1V Inputs

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ABSOLUTE MAXIMUM RATINGS

BATT to GND ...........................................................-0.3V to 6.0V

BATT Forward Current ..........................................................0.5A

OUT to GND.............................................................-0.3V to 6.0V

OUT, LX Current.......................................................................1A

LX to GND................................................................-0.3V to 6.0V

SHDN, FB, BATTLO, PFO to GND ...........................-0.3V to 6.0V

PFI to GND ............................................................-0.3V to VBATT

Reverse Battery Current (TA = +25°C) (Note 1) ...............220mA

Continuous Power Dissipation

µMAX (derate 4.1mW/°C above 70°C)..........................330mW

Operating Temperature Range

MAX1642EUA/MAX1643EUA ............................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +165°C

Lead Temperature (soldering, 10sec) .............................+300°C

RL = 3kΩ, TA = +25°C

VFB = 1.3V

ILOAD = 20mA

VBATT = 1.0V (MAX1642)

0.9V < VBATT < 1.5V (tON = K / VBATT)

VOUT = 3.5V (MAX1642)

IDIODE = 100mA, P-channel switch off

VOUT = 3.3V

VFB < 0.1V

External feedback

VOUT = 3.5V

VOUT = 3.3V

0.9V < VBATT < 1.5V, VOUT = 3.3V

CONDITIONS

FB Input Current

Efficiency

µA

3.5

ISHDN,BATT

Shutdown Current into BATT

µA

0.1

ISHDN,OUT

Shutdown Current into OUT

µA

6.5

IQBATT

Quiescent Current into BATT

µA

IQOUT

Quiescent Current into OUT

1.5

RATIO

Off-Time Tracking Ratio (Note 3)

mV/°C

-2

Start-Up Voltage Tempco

0.88

0.7

VBATT(MIN)

Minimum Operating Input Voltage

Start-Up Voltage (Note 2)

V-µs

On-Time Constant

0.8

P-Channel Catch-Diode Voltage

Ω

1.5

2.2

P-Channel On-Resistance

3.16

3.30

3.44

VOUT

Output Voltage

2.0

5.2

Output Voltage Range

1.18

1.225

1.27

VFB

FB Set Voltage

Ω

1.5

N-Channel On-Resistance

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

ELECTRICAL CHARACTERISTICS

(VBATT = VSHDN = 1.3V, ILOAD = 0mA, FB = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

Note 1: The reverse battery current is measured from the

Typical Operating Circuit’s input terminal to GND when the battery is con-

nected backward. A reverse current of 220mA will not exceed package dissipation limits but, if left for an extended time

(more than 10 minutes), may degrade performance.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

1.65

Maximum Operating Input Voltage

Falling PFI, hysteresis = 1%

590

614

632

PFI Trip Voltage

VPFI = 0V, VOUT = 3.3V, ISINK = 1mA

VPFI = 650mV

0.4

VOL

PFO, BATTLO Low Output Voltage

PFI Input Current

VOUT = 3.3V, hysteresis = 2% (MAX1643)

VPFI = 650mV, VPFO = 6V

0.96

1.0

1.04

BATTLO Trip Voltage

µA

PFO, BATTLO Leakage Current

% of VBATT (MAX1642)

VIH

SHDN Input High Voltage

VIL

SHDN Input Low Voltage

(MAX1642)

SHDN Input Current

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