Dual-Output Power-Supply
Controller for Notebook Computers
MAX786
ABSOLUTE MAXIMUM RATINGS
V+ to GND................................................................-0.3V to 36V
PGND to GND .......................................................................±2V
VL to GND ..................................................................-0.3V to 7V
BST3, BST5 to GND .................................................-0.3V to 36V
LX3 to BST3 ...............................................................-7V to 0.3V
LX5 to BST5 ...............................................................-7V to 0.3V
Inputs/Outputs to GND
(D1, D2, SHDN, ON5, REF, SS5, CS5,
FB5, SYNC, CS3,FB3, SS3, ON3) ............-0.3V to (VL + 0.3V)
VH to GND ...............................................................-0.3V to 20V
Q1, Q2 to GND ............................................-0.3V to (VH + 0.3V)
DL3, DL5 to PGND .......................................-0.3V to (VL + 0.3V)
DH3 to LX3 ..............................................-0.3V to (BST3 + 0.3V)
DH5 to LX5 ..............................................-0.3V to (BST5 + 0.3V)
REF, VL Short to GND................................................Momentary
REF Current ........................................................................20mA
VL Current ..........................................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
SSOP (derate 9.52mW/°C above +70°C)....................762mW
Operating Temperature Ranges
MAX786CAI/MAX786_CAI .................................0°C to +70°C
MAX786EAI/MAX786_EAI ...............................-40°C to +85°C
Lead Temperature (soldering, 10sec) ............................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V+ = 15V, GND = PGND = 0V, I
VL
= I
REF
= 0mA, SHDN = ON3 = ON5 = 5V, other digital input levels are 0V or +5V,
T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
3.3V AND 5V STEP-DOWN CONTROLLERS
Input Supply Range
FB5 Output Voltage
0mV < (CS5-FB5) < 70mV, 6V < V + < 30V
(includes load and line regulation)
0mV < (CS3-FB3) < 70mV, 6V < V + < 30V
(includes load and line regulation)
MAX786
MAX786R
MAX786S
CONDITIONS
MIN
5.5
4.80
3.17
3.32
3.46
5.08
3.35
3.50
3.65
2.5
0.03
100
4.0
TYP
MAX
30
5.20
3.46
3.60
3.75
UNITS
V
V
FB3 Output Voltage
V
%
%/V
mV
µA
mA
V
V
V
V
V
mV
µA
µA
mW
µA
V
nA
Load Regulation
Either controller (CS_ -FB_ = 0mV to 70mV)
Line Regulation
Either controller (V+ = 6V to 30V)
Current-Limit Voltage
CS3-FB3 or CS5-FB5
SS3/SS5 Source Current
SS3/SS5 Fault Sink Current
INTERNAL REGULATOR AND REFERENCE
VL Output Voltage
ON5 = ON3 = 0V, 5.5V < V+ < 30V, 0mA < I
L
< 25mA
VL Fault Lockout Voltage
Falling edge, hysteresis = 1%
VL/FB5 Switchover Voltage
Rising edge of FB5, hysteresis = 1%
REF Output Voltage
No external load (Note 1)
REF Fault Lockout Voltage
Falling edge
REF Load Regulation
0mA < I
L
< 5mA (Note 2)
–— –
— —
SHDN = D1 = D2 = ON3 = ON5 = 0V, V+ = 30V
V+ Shutdown Current
V+ Standby Current
D1 = D2 = ON3 = ON5 = 0V, V+ = 30V
Quiescent Power Consumption
(both PWM controllers on)
V+ Off Current
COMPARATORS
D1, D2 Trip Voltage
D1, D2 Input Current
D1 = D2 = 0V, FB5 = CS5 = 5.25V,
FB3 = CS3 = 3.5V
FB5 = CS5 = 5.25V, VL switched over to FB5
Falling edge, hysteresis = 1%
D1 = D2 = 0V, 5V
80
2.5
2
4.5
3.6
4.2
3.24
2.4
120
6.5
30
25
70
5.5
30
1.61
5.5
4.2
4.7
3.36
3.2
75
40
120
8.6
60
1.69
±100
2
________________________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
