MAX1639 datasheet(2/13 Pages) MAXIM

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FREQ Input Voltage

High-Speed Step-Down Controller with

Synchronous Rectification for CPU Power

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD = VCC = +5V, PGND = AGND = 0V, FREQ = REF, TA = 0°C to +85°C, unless otherwise noted.)

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.

VDD, VCC, PWROK to AGND....................................-0.3V to +6V

PGND to AGND ..................................................................±0.3V

CSH, CSL to AGND ....................................-0.3V to (VCC + 0.3V)

DL to PGND................................................-0.3V to (VDD + 0.3V)

REF, CC1, CC2, FREQ, FB to AGND .........-0.3V to (VCC + 0.3V)

BST to PGND..........................................................-0.3V to +12V

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

DH to LX.............................................(LX - 0.3V) to (BST + 0.3V)

Continuous Power Dissipation (TA = +70°C)

16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ....696mW

θJC...........................................................................65°C/W

Operating Temperature Range

MAX1639ESE....................................................-40°C to +85°C

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

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

FREQ = AGND

FREQ = REF

VCC = VDD

FREQ = VCC

PWROK = 5.5V

Includes line and load

regulation errors

ISINK = 2mA, VCC = 4.5V

Falling FB, 1% hysteresis with respect to VREF

Rising FB, 1% hysteresis with respect to VREF

0µA < IREF < 100µA

No load

VCC = VDD = 5.5V, FB forced 60mV above

regulation point, operating or standby mode

VCC rising edge, 1% hysteresis

VREF = 0V

Rising edge, 1% hysteresis

CONDITIONS

kHz

255

300

345

Switching Frequency

540

600

660

850

1000

1150

µA

PWROK Output Current High

0.4

PWROK Output Voltage Low

6.5

9.5

PWROK Trip Level

-7.5

-6

-4.5

0.5

4.0

Reference Short-Circuit Current

2.7

3.0

Reference Undervoltage Lockout

4.5

5.5

Input Voltage Range

1.083

1.117

1.089

1.111

FB Voltage

Reference Load Regulation

3.465

3.5

3.535

Reference Voltage

0.1

VDD Supply Current (IDD)

4.0

4.2

Input Undervoltage Lockout

UNITS

MIN

TYP

MAX

PARAMETER

TA = +25°C to +85°C

TA = 0°C to +85°C

2.5

CSH - CSL = 0mV to 80mV

AC Load Regulation

CSH - CSL = 0mV to 80mV

0.1

DC Load Regulation

FB overdrive = 60mV

FB overdrive = 0V

Operating

mode

3.6

VCC = VDD

= 5.5V

VREF = 0V

Shutdown

mode

VCC Supply Current (ICC)

VCC (high)

GND (low)

FREQ = VCC

VCC - 0.1

Maximum Duty Cycle

0.2

FREQ Input Voltage

REF (mid)

3.3

3.7

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