MAX8741/MAX8742
500kHz Multi-Output Power-Supply Controllers
with High Impedance in Shutdown
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS
(V+ = 15V, both PWMs on, SYNC = V
L
, V
L
load = 0, REF load = 0, SKIP = 0, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 6)
MIN TYP MAX
MAIN SMPS CONTROLLERS
Input Voltage Range 4.2
30.0
V
3V Output Voltage in Adjustable Mode
V+ = 4.2V to 30V, CSH3 - CSL3 = 0,
CSL3 connected to FB3
2.42 2.58
V
3V Output Voltage in Fixed Mode
V+ = 4.2V to 30V, 0 < CSH3 - CSL3
< 80mV, FB3 = 0
3.20 3.47
V
5V Output Voltage in Adjustable Mode
V+ = 4.2V to 30V, CSH5 - CSL5 = 0,
CSL5 connected to FB5
2.42 2.58
V
5V Output Voltage in Fixed Mode
V+ = 5.3V to 30V, 0 < CSH5 - CSL5
< 80mV, FB5 = 0
4.85 5.25
V
Output Voltage Adjust Range Either SMPS
REF
5.5 V
Adjustable-Mode Threshold Voltage Dual-mode comparator 0.5 1.1 V
CSH3 - CSL3 or CSH5 - CSL5 80
120
Current-Limit Threshold
SKIP = V
L
or V
DD
< 13V or SECFB < 2.44V -50
-150
450 550
Oscillator Frequency
SYNC = 0
283 383
kHz
SYNC = V
L
95
Maximum Duty Factor
SYNC = 0 (Note 2) 97
%
SYNC Input Frequency Range
400 583
kHz
FLYBACK CONTROLLER
V
DD
Regulation Threshold Falling edge (MAX8742) 13 14 V
SECFB Regulation Threshold Falling edge (MAX8741)
2.44 2.60
V
V
DD
Shunt Threshold Rising edge, hysteresis = 1% (MAX8742) 18 20 V
V
DD
Shunt Sink Current V
DD
= 20V (MAX8742) 10 mA
12V LINEAR REGULATOR (MAX8742)
12OUT Output Voltage 13V < V
DD
< 18V, 0mA < I
LOAD
< 100mA
11.65 12.50
V
Quiescent V
DD
Current V
DD
= 18V, run mode, no 12OUT load
100
INTERNAL REGULATOR AND REFERENCE
V
L
Output Voltage
SHDN = V+, RUN/ON3 = TIME/ON5 = 0,
5.4V < V+ < 30V, 0 < I
LOAD
< 50mA
4.7 5.1 V
V
L
Undervoltage-Lockout Fault Threshold Falling edge, hysteresis = 1% 3.5 3.7 V
V
L
Switchover Threshold Rising edge of CSL5, hysteresis = 1% 4.2 4.7 V
REF Output Voltage No external load (Note 4)
2.45 2.55
12.5
REF Load Regulation
0 < I
LOAD
< 5mA
100.0
mV
REF Sink Current 10 µA
REF Fault-Lockout Voltage Falling edge 1.8 2.4 V
V+ Operating Supply Current V
L
switched over to CSL5, 5V SMPS on 50 µA
(16 Seiten)
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