MAX1637EEE datasheet(2/20 Pages) MAXIM

2 / 20 page

Miniature, Low-Voltage,

Precision Step-Down Controller

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, VCC = VGG = 5V, SYNC = VCC, IREF = 0mA, 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.

GND to PGND .............................................................+2V to -2V

LX, BST to GND......................................................-0.3V to +36V

BST, DH to LX...........................................................-0.3V to +6V

VCC, VGG, CSL, CSH, SHDN to GND.......................-0.3V to +6V

DL to GND..................................................-0.3V to (VGG + 0.3V)

REF, SKIP, SYNC, CC to GND ...................-0.3V to (VCC + 0.3V)

REF Output Current.............................................................20mA

REF Short-Circuit to GND ..............................................Indefinite

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

Continuous Power Dissipation (TA = +70°C)

QSOP (derate 8.3mW/°C above +70°C) ......................667mW

Storage Temperature Range .............................-65°C to +160°C

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

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

SYNC = GND

SYNC = VCC

FB tied to VOUT, 0mV < (CSH - CSL) < 80mV,

includes line and load regulation

VCC = 3.15V to 5.5V

REF load = 0µA to 50µA

VCC, VGG

REF load = 0µA

Rising edge, hysteresis = 15mV

SHDN = GND, VCC = VGG

CSH - CSL = 0mV to CSH - CSL = 100mV

CSH - CSL

VCC = 5V

VCC = 3.3V

SHDN to full current limit, four levels

VFB = VREF

CONDITIONS

170

200

230

Oscillator Frequency

kHz

270

300

330

REF Line Regulation

REF Load Regulation

1.080

1.100

1.120

REF Output Voltage

2.80

3.05

VGG Undervoltage Lockout Threshold

2.80

3.05

VCC Undervoltage Lockout Threshold

AC Load Regulation

Idle-Mode Switchover Threshold

clocks

512

Soft-Start Ramp Time

-50

FB Input Current

3.15

5.5

Input Voltage Range

µA

0.5

Shutdown Supply Current

1.080

1.100

1.120

Output Voltage

VREF

5.5

Output Adjustment Range

VREF

3.6

UNITS

MIN

TYP

MAX

PARAMETER

CSH > CSL

CSH < CSL

100

120

Current-Limit Threshold

-145

-100

-55

Output not switching

1.5

2.5

Power Consumption

1.75

SYNC = GND

SYNC = VCC

200

SYNC Input Pulse Width High

Maximum Duty Factor

(Note 1)

kHz

240

340

SYNC Input Frequency Range

200

SYNC Input Rise/Fall Time

200

SYNC Input Pulse Width Low

VCC = VGG = 5V

VCC = VGG = 3.3V

SMPS CONTROLLER

INTERNAL REFERENCE

OSCILLATOR

MAX1637EEE Datasheet(PDF) 2 Page - Maxim Integrated Products

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