MAX1761 Maxim, MAX1761 Datasheet - Page 4

• Manufacturer Part Number: MAX1761
• Description: Small / Dual / High-Efficiency Buck Controller for Notebooks
• Manufacturer: Maxim

Small, Dual, High-Efficiency
Buck Controller for Notebooks
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = 15V, C
unless otherwise noted.) (Note 1)
4
PWM CONTROLLERS
Input Voltage Range
DC Output Voltage Accuracy
(Note 3)
Output Voltage Adjust Range
OUT_ Input Resistance
FB_ Input Bias Current
CS_ Input Bias Current
Soft-Start Ramp Time
On-Time (Note 4)
Minimum Off-Time (Note 4)
BIAS AND REFERENCE
Quiescent Supply Current
Shutdown Supply Current
VL Output Voltage
Reference Voltage
Reference Load Regulation
REF Sink Current
FAULT PROTECTION
Output Undervoltage Threshold
(Foldback)
Output Undervoltage Lockout
Timer
Current-Limit Threshold
VL Undervoltage Lockout
Threshold
_______________________________________________________________________________________
PARAMETER
VL
V
SYMBOL
V
V
= 4.7µF, C
FB,UVLO(t)
VL,UVLO
V
FB,UVFB
V
t
I
OUT_
t
V+
OFF
REF
VL
VL
ON
I+
I+
REF
IL
IL
REF
(Note 2)
VL externally driven (Note 2)
V+ = 4.5V to 20V,
VL = 4.75V to 5.25V,
ON2 = VL
V
V
Zero to full ILIM
V+ = 10V, V
V
Above regulation point
FB1 = FB2 = GND, VL = 5V, V
V
FB1 = FB2 = GND, V
and V
regulation point
VL = 5V, ON1 = ON2 = GND
VL = 0, 5V
I
V+ = 5V to 20V, no load
I
REF in regulation
With respect to the regulation point, no load
Measured from ON_ signal going high
GND – CS_, positive direction
GND – CS_, negative direction, ON2 = floating
Rising edge, hysteresis = 20mV, PWM is
disabled below this voltage
LOAD
REF
FB_
CS_
OUT2
OUT2
= 0.1µF, VL not externally driven unless otherwise noted, T
= 0 to 50µA
= 1V, VL = 5V
= 0, VL = 5V
OUT2
= 0 to 25mA, V+ = 5V to 20V
= 1.8V
forced above regulation point
forced above
OUT1
CONDITIONS
= 2.5V,
OUT1
FB_ = OUT_
FB1 = GND
FB2 = GND
OUT1
OUT2
VL undriven
VL = 5V
OUT1
and
2.475
1.782
-135
MIN
4.75
0.99
1.98
-0.1
661
648
4.5
4.5
4.1
80
10
60
10
92
-1
1
TYP
A
= -40°C to +85°C,
2.525
1.818
MAX
5.25
1.01
4.75
2.02
-105
300
809
792
500
108
5.5
0.1
1.2
1.7
0.5
4.4
20
10
10
80
32
1
8
UNITS
mA
mA
mV
mV
kΩ
ms
µA
µA
µA
µA
µA
µs
ns
ns
%
V
V
V
V
V
V