Electrical characteristics – Rainbow Electronics MAX1791 User Manual
Page 4
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX, Step-Down
Controllers for Notebooks
4
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ELECTRICAL CHARACTERISTICS
(V
VP
= 15V, VL enabled, C
VL
= 1µF, C
REF
= 0.1µF, T
A
= -40 to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VP Input Voltage Range
V
VP
5
20
V
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
1.827
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
2.538
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
3.350
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
5.075
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
1.269
V
FB Input Bias Current
V
FB
= 1.3V
-0.2
0.2
µA
V
OUT
= 1.25V, V
VP
= 6V
666
814
On-Time (Note 2)
t
ON
V
OUT
= 5V, V
VP
= 6V
2550
3110
ns
Minimum Off-Time (Note 2)
t
OFF
250
550
ns
VL Quiescent Supply Current
FB = GND, V
VL
= 5V, OUT forced above the
regulation point
260
µA
V
V L
= float
410
VP Quiescent Supply Current
FB = GND, OUT forced above
the regulation point V
VP
= 20V
V
V L
= 5V
200
µA
VL Shutdown Supply Current
V
VL
= 5V,
SHDN = GND
15
µA
VP Shutdown Supply Current
S HD N = GN D , m easur ed at V P , V
V L
= 0 or 5V
12
µA
VL Output Voltage
I
LOAD
= 0 to 25mA, V
VP
= 5V to 20V
4.5
4.75
V
Reference Voltage
V
VL
= 4.75V to 5.25V, no load
1.98
2.02
V
Reference Load Regulation
I
REF
= 0 to 50µA
0.01
V
REF Sink Current
REF in regulation
10
µA
Output Undervoltage Threshold
(Foldback)
With respect to regulation point, no load
60
80
%
Output Undervoltage Lockout
Time (Foldback)
From
SHDN signal going high, V
OUT
< 0.6 x
regulation point
10
42
ms
Current-Limit Threshold
V
ILIM
-90
-110
mV