MAX782
Triple-Output Power-Supply
Controller for Notebook Computers
_______________________________________________________________________________________ 3
PARAMETER CONDITIONS MIN TYP MAX UNITS
D1-D3 Trip Voltage Falling edge, hysteresis = 1%
Q1-Q3 Output Low Voltage
VL Output Voltage
REF Fault Lockout Voltage Falling edge 2.4 3.2
ON5 = ON3 = 0V, 5.5V < V+ < 30V, 0mA < I
L
< 25mA
V
REF Output Voltage No external load (Note 2) 3.24 3.36 V
4.5 5.5
REF Load Regulation 0mA < I
L
< 5mA 30 75 mV
V+ Standby Current 70 110 µA
1.61 1.69 V
D1-D3 Input Current D1 = D2 = D3 = 0V to 5V
V
D1 = D2 = D3 = DA0 = DA1 = DB0 = DB1 = 0V,
FB5 = CS5 = 5.25V, FB3 = CS3 = 3.5V
6.0 8.6
±100
mW
V+ Off Current
nA
FB5 = CS5 = 5.25V, VL switched over to FB5 30 60 µA
Q1-Q3 Source Current VH = 15V, Q1-Q3 forced to 2.5V 12 20 30 µA
Q1-Q3 Sink Current
VL Fault Lockout Voltage
VH = 15V, Q1-Q3 forced to 2.5V 200 500 1000 µA
Q1-Q3 Output High Voltage
I
SOURCE
= 5µA, VH = 3V
VH-0.5 V
I
SINK
= 20µA, VH = 3V
0.4 V
Quiescent VH Current VH = 18V, D1 = D2 = D3 = 5V, no external load
Falling edge, hysteresis = 1% 3.6 4.2 V
610µA
VL/FB5 Switchover Voltage Rising edge of FB5, hysteresis = 1% 4.2 4.7 V
Note 1: Output current is further limited by maximum allowable package power dissipation.
Note 2: Since the reference uses VL as its supply, V+ line regulation error is insignificant.
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, GND = PGND = 0V, I
VL
= I
REF
= 0mA, ON3 = ON5 = 5V, other digital input levels are 0V or +5V, T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
Quiescent Power Consumption
(both PWM controllers on)
D1 = D2 = D3 = ON3 = ON5 = DA0 = DA1 = DB0 =
DB1 = 0V, V+ = 30V
SYNC Low Pulse Width 200 ns
SYNC High Pulse Width 200 ns
Oscillator Frequency
SYNC = 0V or 5V 170 200 230
kHz
SYNC = 3.3V 270 300 330
Maximum Duty Cycle
SYNC = 0V or 5V 92 95
%
SYNC = 3.3V 89 92
Oscillator SYNC Range 240 350 kHz
SYNC Rise/Fall Time Not tested 200 ns
Input Low Voltage ON3, ON5, DA0, DA1, DB0, DB1, SYNC 0.8 V
ON3, ON5, DA0, DA1, DB0, DB1 2.4
Input Current
ON3, ON5, DA0, DA1, DB0, DB1, V
IN
= 0V or 5V
±1 µA
DL3/DL5 Sink/Source Current DL3, DL5 forced to 2V 1 A
DL3/DL5 On Resistance High or low 7 Ω
DH3/DH5 On Resistance High or low, BST3-LX3 = BST5-LX5 = 4.5V 7 Ω
Input High Voltage
SYNC VL-0.5
V
DH3/DH5 Sink/Source Current BST3-LX3 = BST5-LX5 = 4.5V, DH3, DH5 forced to 2V 1 A
INTERNAL REGULATOR AND REFERENCE
COMPARATORS
OSCILLATOR AND INPUTS/OUTPUTS
(18 paginas)
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