Rainbow Electronics MAX786 - Manual (Page 2)

MAX786
Dual-Output Power-Supply
Controller for Notebook Computers
2 ________________________________________________________________________________________________
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.)
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
MAX786S
MAX786R
MAX786
FB3 Output Voltage
3.46 3.65 3.75
V
0mV < (CS3-FB3) < 70mV, 6V < V + < 30V
(includes load and line regulation)
3.32 3.50 3.60
REF Load Regulation 30 75 mV 0mA < I L < 5mA (Note 2)
PARAMETER
VL Output Voltage
MIN TYP MAX
4.5 5.5
UNITS
Current-Limit Voltage
V
80 100 120
VL Fault Lockout Voltage
mV
Line Regulation
3.6 4.2
0.03 %/V
Load Regulation 2.5
V
%
3.17 3.35 3.46
VL/FB5 Switchover Voltage
SS3/SS5 Source Current 2.5 4.0 6.5 µA
4.2 4.7 V
REF Output Voltage
SS3/SS5 Fault Sink Current 2
3.24 3.36
mA
V
REF Fault Lockout Voltage 2.4 3.2 V
Input Supply Range 5.5 30 V
FB5 Output Voltage 4.80 5.08 5.20 V
CONDITIONS
ON5 = ON3 = 0V, 5.5V < V+ < 30V, 0mA < I L < 25mA
CS3-FB3 or CS5-FB5
Falling edge, hysteresis = 1%
Either controller (V+ = 6V to 30V)
Either controller (CS_ -FB_ = 0mV to 70mV)
Rising edge of FB5, hysteresis = 1%
No external load (Note 1)
0mV < (CS5-FB5) < 70mV, 6V < V + < 30V
(includes load and line regulation)
Falling edge
V+ Shutdown Current 25 40 µA
–
S
—
H
—
D
—
N
–
= D1 = D2 = ON3 = ON5 = 0V, V+ = 30V
V+ Standby Current 70 120 µA D1 = D2 = ON3 = ON5 = 0V, V+ = 30V
Quiescent Power Consumption
(both PWM controllers on)
5.5 8.6 mW
D1 = D2 = 0V, FB5 = CS5 = 5.25V,
FB3 = CS3 = 3.5V
V+ Off Current 30 60 µA FB5 = CS5 = 5.25V, VL switched over to FB5
D1, D2 Trip Voltage 1.61 1.69 V Falling edge, hysteresis = 1%
D1, D2 Input Current ±100 nA D1 = D2 = 0V, 5V
3.3V AND 5V STEP-DOWN CONTROLLERS
INTERNAL REGULATOR AND REFERENCE
COMPARATORS