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MAX1761EEE-T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
MAX1761
Small, Dual, High-Efficiency
Buck Controller for Notebooks
4 _______________________________________________________________________________________
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PWM CONTROLLERS
V+ (Note 2) 4.5 20 V
Input Voltage Range
VL VL externally driven (Note 2) 4.75 5.25
FB_ = OUT_ 0.99 1.01
FB1 = GND 2.475 2.525 V
DC Output Voltage Accuracy
(Note 3)
V
OUT_
V+
= 4.5V to 20V,
VL
= 4.75V to 5.25V,
ON2 = VL
FB2 = GND 1.782 1.818
Output Voltage Adjust Range 1 5.5 V
OUT_ Input Resistance 80 300 kΩ
FB_ Input Bias Current V
FB_
= 1V, VL = 5V -0.1 0.1 µA
CS_ Input Bias Current V
CS_
= 0, VL = 5V -1 1 µA
Soft-Start Ramp Time Zero to full ILIM µs
OUT1 661 809
On-Time (Note 4) t
ON
V+
= 10V, V
OUT1
= 2.5V,
V
OUT2
= 1.8V
OUT2 648 792
ns
Minimum Off-Time (Note 4) t
OFF
Above regulation point 500 ns
BIAS AND REFERENCE
IL
FB1 = FB2 = GND, VL = 5V, V
OUT1
and
V
OUT2
forced above regulation point
1.2 mA
VL undriven 1.7
Quiescent Supply Current
I+
FB1 = FB2 = GND, V
OUT1
and V
OUT2
forced above
regulation point
VL = 5V 0.5
mA
IL VL = 5V, ON1 = ON2 = GND 10 µA
Shutdown Supply Current
I+ VL = 0, 5V 10 µA
VL Output Voltage VL I
LOAD
= 0 to 25mA, V+ = 5V to 20V 4.5 4.75 V
Reference Voltage V
REF
V+ = 5V to 20V, no load 1.98 2.02 V
Reference Load Regulation I
REF
I
REF
= 0 to 50µA 8 mV
REF Sink Current REF in regulation 10 µA
FAULT PROTECTION
Output Undervoltage Threshold
(Foldback)
V
FB
,
UVFB
With respect to the regulation point, no load 60 80 %
Output Undervoltage Lockout
Timer
V
FB
,
UVLO
(
t
)
Measured from ON_ signal going high 10 32 ms
GND – CS_, positive direction 92 108
Current-Limit Threshold
GND – CS_, negative direction, ON2 = floating -135 -105
mV
VL Undervoltage Lockout
Threshold
V
VL
,
UVLO
Rising edge, hysteresis = 20mV, PWM is
disabled below this voltage
4.1 4.4 V
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = 15V, C
VL
= 4.7µF, C
REF
= 0.1µF, VL not externally driven unless otherwise noted, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
MAX1761
Small, Dual, High-Efficiency
Buck Controller for Notebooks
_______________________________________________________________________________________ 5
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GATE DRIVERS
DH_ Gate Driver On-Resistance
(Pullup)
V+ = 6V to 20V, DH_, high state 8 Ω
DH_ Gate Driver On-Resistance
(Pulldown)
DH_, low state 10 Ω
DL_ Gate Driver On-Resistance
(Pullup)
DL_, high state 8 Ω
DL_ Gate Driver On-Resistance
(Pulldown)
DL_, low state 5 Ω
DH_ Gate Driver Source/Sink
Current
V
DH_
= 3V, V+ = 6V A
DL_ Gate Drive Sink Current V
DL_
= 2.5V A
DL_ Gate Driver Source Current V
DL_
= 2.5V A
LOGIC CONTROLS
ON_ Logic Input High Voltage 2.05 V
ON2 Logic Input Float Voltage
(Forced-PWM Mode)
V
ON1
> 2.0V 1.3 1.95 V
ON_ Logic Input Low Voltage 0.5 V
ON1 Logic Input Current -1 1 µA
ON2 Logic High Input Current V
ON2
> 2.0V 0 3 µA
ON2 Logic Low Input Current V
ON2
< 0.5V, V
ON1
> 2.0V -2 0 µA
FB_ Dual Mode Threshold 50 150 mV
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, C
VL
= 4.7µF, C
REF
= 0.1µF, VL not externally driven unless otherwise noted, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
Note 2: If V+ is less than 5V, V+ must be connected to VL. If VL is connected to V+, V+ must be between 4.5V and 5.5V.
Note 3: DC output accuracy specifications refer to the trip-level error of the error amplifier. The output voltage will have a DC regula-
tion higher than the trip level by 50% of the ripple. In PFM mode, the output will rise by approximately 1.5% when transition-
ing from continuous conduction to no load.
Note 4: One-shot times are measured at the DH pin (V+ = 15V, C
DH
= 400pF, 90% point to 90% point). Actual in-circuit times may
be different due to MOSFET switching speeds.This effect can also cause the switching frequency to vary.
MAX1761
Small, Dual, High-Efficiency
Buck Controller for Notebooks
6 _______________________________________________________________________________________
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 2.5V, SKIP MODE)
20
MAX1761 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +5V = VL
V+ = +18V
V+ = +7V
V+ = +12V
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(3.3V, SKIP MODE)
20
MAX1761 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +5V = VL
V+ = +7V
V+ = +12V
V+ = +18V
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(3.3V, PWM MODE)
20
MAX1761 toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +5V = VL
V+ = +7V
V+ = +12V
V+ = +18V
-0.45
-0.35
-0.40
-0.20
-0.25
-0.30
-0.05
-0.10
-0.15
0
010155 20253035
VL VOLTAGE vs. OUTPUT CURRENT
MAX1761 toc09
VL CURRENT (mA)
VL ERROR (%)
V
OUT1
= 2.5V, I
OUT1
= 2A,
V
OUT2
= 1.8V, I
OUT2
= 2A
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(1.8V, PWM MODE)
20
MAX1761 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +5V = VL
V+ = +7V
V+ = +12V
V+ = +18V
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(2.5V, SKIP MODE, 3.5A COMPONENTS)
20
MAX1761 toc07
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +5V
V+ = +7V
V+ = +12V
V+ = +18V
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(2.5V, PWM MODE)
20
MAX1761 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +12V
V+ = +5V = VL
V+ = +7V
V+ = +18V
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(1.8V, SKIP MODE)
20
MAX1761 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +18V
V+ = +12V
V+ = +7V
V+ = +5V = VL
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

MAX1761EEE-T

Mfr. #:
Buy MAX1761EEE-T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers
Lifecycle:
New from this manufacturer.
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