MAX1775EEE datasheet(2/15 Pages) MAXIM

2 / 15 page

Dual-Output Step-Down

DC-DC Converter for PDA/Palmtop Computers

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = +12V, VMAIN = VINC = VCS- = VCS+ = +3.3V, VCORE = +1.8V, Circuit of Figure 4, TA = 0°C to +85°C, unless otherwise noted.

Typical values are at TA = +25°C.)

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.

IN, SHDNM, CVH to GND.......................................-0.3V to +30V

IN to CVH, PDRV ......................................................-0.3V to +6V

PDRV to GND..................................(VCVH - 0.3V) to (VIN + 0.3V)

PGND to GND .......................................................-0.3V to +0.3V

All Other Pins to GND...............................................-0.3V to +6V

Core Output Short Circuit...........................................Continuous

Continuous Power Dissipation

16-Pin QSOP (derate 7.1mW/°C above +70°C)..........571mW

Operating Temperature .......................................-40°C to +85°C

Storage Temperature.........................................-65°C to +150°C

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage

VIN

2.7

Input Quiescent Supply Current

IIN

VFBM = +1.5V, VFBC = +1.5V,

V SHDNM = V SHDNC = +3.3V

µA

CS- Quiescent Supply Current

ICS-

VFBM = +1.5V, VFBC = +1.5V,

V SHDNM = V SHDNC = +3.3V

110

220

µA

Core Regulator Quiescent

Supply Current

IINC

VFBM = +1.5V, VFBC = +1.5V,

V SHDNM = V SHDNC = +3.3V

120

µA

IN Shutdown Supply Current

SHDNM = SHDNC = GND

µA

MAIN REGULATOR

Main Output Voltage Adjust

Range

1.25

5.5

FBM Regulation Threshold

VFBM

V(CS+ - CS-) = 0 to +60mV, VIN = +2.7V to +28V

1.21

1.25

1.29

FBM Input Current

IFBM

VFBM = +1.3V

-0.1

0.1

µA

Current-Limit Threshold

VCLM

VCS+ - VCS-

100

Minimum Current-Limit

Threshold

VMIN

VCS+ - VCS-

615

Valley Current Threshold

VVALLEY

VCS+ - VCS-

Zero Current Threshold

VZERO

VCS+ - VCS-

015

PDRV, NDRV Gate Drive

Resistance

VCS- = +3.3V, ILOAD = 50mA

4.4

Ω

CS- to CVL Switch Resistance

ICVL = 50mA

4.5

Ω

PDRV, NDRV Dead Time

Maximum Duty Cycle

100

Minimum On-Time

200

400

650

Minimum Off-Time

200

400

650

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