MAX8741/MAX8742
500kHz Multi-Output Power-Supply Controllers
with High Impedance in Shutdown
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, both PWMs on, SYNC = V
L
, V
L
load = 0, REF load = 0, SKIP = 0, T
A
= 0°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.)
SYNC = V
L
95 97
Maximum Duty Factor
SYNC = 0 (Note 2)
96.5
98
%
SYNC Input High Pulse Width Not tested
200
ns
SYNC Input Low Pulse Width Not tested
200
ns
SYNC Rise/Fall Time Not tested
200
ns
SYNC Input-Frequency Range
400 583
kHz
Current-Sense Input Leakage Current
V+ = V
L
= 0,
CSL3 = CSH3 = CSL5 = CSH5 = 5.5V
0.01
10 µA
FLYBACK CONTROLLER
V
DD
Regulation Threshold Falling edge (MAX8742) 13 14 V
SECFB Regulation Threshold Falling edge (MAX8741)
2.44 2.60
V
DL Pulse Width V
DD
< 13V or SECFB < 2.44V
0.75
µs
V
DD
Shunt Threshold Rising edge, hysteresis = 1% (MAX8742) 18 20 V
V
DD
Shunt Sink Current V
DD
= 20V (MAX8742) 10 mA
V
DD
Leakage Current V
DD
= 5V, off mode (Note 3) 30 µA
12V LINEAR REGULATOR (MAX8742)
12OUT Output Voltage 13V < V
DD
< 18V, 0 < I
LOAD
< 120mA
11.65 12.10 12.50
V
12OUT Current Limit 12OUT forced to 11V, V
DD
= 13V 150 mA
Quiescent V
DD
Current V
DD
= 18V, run mode, no 12OUT load 50
100
INTERNAL REGULATOR AND REFERENCE
V
L
Output Voltage
SHDN = V+, RUN/ON3 = TIME/ON5 = 0,
5.4V < V+ < 30V, 0mA < I
LOAD
< 50mA
4.7 5.1 V
V
L
Undervoltage-Lockout Fault Threshold Falling edge, hysteresis = 1% 3.5 3.6 3.7 V
V
L
Switchover Threshold Rising edge of CSL5, hysteresis = 1% 4.2 4.5 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 5 50 µA
V+ Standby Supply Current
V+ = 5.5V to 30V, both SMPSs off, includes
current into SHDN
30 60 µA
V+ Standby Supply Current in Dropout
V+ = 4.2V to 5.5V, both SMPSs off, includes
current into SHDN
50
200
µA
V+ Shutdown Supply Current V+ = 4.0V to 30V, SHDN = 0 4 10 µA
MAX8742 2.5 4
Quiescent Power Consumption
Both SMPSs enabled,
FB3 = FB5 = 0,
CSL3 = CSH3 = 3.5V,
(16 Seiten)
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