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MAX1636EAP

Low-Voltage, Precision Step-Down Controller for Portable CPU Power

Maxim Integrated 

Low-Voltage, Precision Step-Down

Controller for Portable CPU Power

ABSOLUTE MAXIMUM RATINGS

V+ to GND ...............................................................-0.3V to 36V

GND to PGND........................................................................±2V

SHDN to GND. ......................................................... -0.3V to 36V

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

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

VL, VCC, CSL, CSH, FB, SKIP to GND ...................... -0.3V to 6V

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

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

VL Output Current... ............................................................50mA

VL Short Circuit to GND..............................................Momentary

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

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

Continuous Power Dissipation (TA = +70°C)

SSOP (derate 8.00mW/°C above +70°C) .....................640mW

Operating Temperature Range

MAX1636EAP. ..................................................-40°C to +85°C

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

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

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

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V+ = 15V, SYNC = VL = VCC, IVL = 0mA, IREF = 0mA, TA = 0°C to +85°C, unless otherwise noted. Typical values

are at TA = +25°C.)

PARAMETER

CONDITIONS

MIN TYP MAX

UNITS

SMPS CONTROLLER

Input Voltage Range, V+

Input source for VL regulator

4.5

30

V

Input Voltage Range, VL

Gate-driver supply rail

4.2

5.5

V

Input Voltage Range, VCC

Internal chip supply rail

3.15

5.5

V

Output Voltage, Adj Mode

FB tied to VOUT, 0mV < (CSH - CSL) < 80mV, 4.5V

< V+ < 30V (includes line and load regulation)

1.090

1.100

1.110

V

Output Voltage, Fixed 2.5V Mode

FB tied to VCC, 0mV < (CSH - CSL) < 80mV, 4.5V

< V+ < 30V (includes line and load regulation)

2.486

2.55

2.614

V

Output Voltage, Fixed 3.3V Mode

FB tied to GND, 0mV < (CSH - CSL) < 80mV, 4.5V

< V+ < 30V (includes line and load regulation)

3.282

3.366

3.450

V

Output Adjustment Range

Current-Limit Threshold

VCC = VL = 5V

VCC = 3.3V, VL = 5V

Positive direction

Negative direction

VREF

VREF

5.5

V

3.6

80

100

120

mV

-145 -100

-55

mV

Power Consumption

Shutdown Supply Current (V+)

FB Input Current

Soft-Start Ramp Time

Idle Mode Switchover Threshold

VCC = 5V, output not switching

VCC = 3.3V, output not switching

SHDN = GND, OVP = GND

FB forced to REF

SHDN to full current limit, five levels

CSH - CSL

2.0

mW

1.5

3

10

µA

-50

50

nA

512

clks

20

30

40

mV

2 _______________________________________________________________________________________

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