Rainbow Electronics MAX8742 - Manual (Page 3)

MAX8741/
M
AX8742
500kHz Multi-Output Power-Supply Controllers
with High Impedance in Shutdown
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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.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
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 µA
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 2.5 2.55 V
0 < I LOAD < 50µA 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,
CSL5 = CSH5 = 5.3V
MAX8741 1.5 4
mW