MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX, Step-Down
Controllers for Notebooks
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
VP, SHDN to GND ..................................................-0.3V to +22V
VP to VL ..................................................................-0.3V to +22V
OUT, VL to GND .......................................................-0.3V to +6V
DL, FB, REF to GND ....................................-0.3V to (VL + 0.3V)
DH to GND....................................................-0.3V to (VP + 0.3V)
CS to GND ....................................................-2.0V to (VP + 0.3V)
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Operating Temperature .......................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
VP
= 15V, VL enabled, C
VL
= 1µF, C
REF
= 0.1µF, T
A
= 0 to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
VP Input Voltage Range V
VP
520V
VL Input Voltage Range V
VL
VL (overdriven) 4.75 5.25 V
OUT Output Voltage
(MAX1762, 1.8V Fixed)
V
OUT
V
VP
= 5V to 20V, V
VL
= 4.75V to 5.25V,
FB = GND, continuous conduction mode
1.773 1.8 1.827 V
OUT Output Voltage
(MAX1762, 2.5V Fixed)
V
OUT
V
VP
= 5V to 20V, V
VL
= 4.75V to 5.25V,
FB = VL, continuous conduction mode
2.463 2.5 2.538 V
OUT Output Voltage
(MAX1791, 3.3V Fixed)
V
OUT
V
VP
= 5V to 20V, V
VL
= 4.75V to 5.25V,
FB = GND, continuous conduction mode
3.250 3.3 3.350 V
OUT Output Voltage
(MAX1791, 5V Fixed)
V
OUT
V
VP
= 7V to 20V, V
VL
= 4.75V to 5.25V,
FB = VL, continuous conduction mode
4.925 5 5.075 V
OUT Output Voltage (Adj Mode)
V
VP
= 5V to 20V, V
VL
= 4.75V to 5.25V,
FB = OUT, continuous conduction mode
1.231 1.250 1.269 V
Output Voltage Adjust Range 0.5 5.5 V
OUT Input Resistance Adjustable-output mode 300 800 1700 kΩ
FB Input Bias Current V
FB
= 1.3V -0.1 0.1 µA
Soft-Start Ramp Time Zero to full I
LIM
1700 µs
V
OUT
= 1.25V, V
VP
= 6V 666 740 814
On-Time (Note 2) t
ON
V
OUT
= 5V, V
VP
= 6V 2550 2830 3110
ns
Minimum Off-Time (Note 2) t
OFF
300 400 500 ns
VL Quiescent Supply Current
FB = GND, V
VL
= 5V, OUT forced above the
regulation point
153 260 µA
V
VL
= float 227 410
VP Quiescent Supply Current
FB = GND, OUT forced
above the regulation point,
V
VP
= 20V
V
VL
= 5V 93 200
µA
VL Shutdown Supply Current V
VL
= 5V, SHDN = GND 2 15 µA
VP Shutdown Supply Current S HD N = GN D , m easur ed at V P , V
V L
= 0 or 5V 4 12 µA
VL Output Voltage I
LOAD
= 0 to 25mA, V
VP
= 5V to 20V 4.5 4.65 4.75 V
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.
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