Rainbow Electronics MAX8742 - Manual (Page 4)

MAX8741/
M
AX8742
500kHz Multi-Output Power-Supply Controllers
with High Impedance in Shutdown
4 _______________________________________________________________________________________
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
FAULT DETECTION
Overvoltage Trip Threshold With respect to unloaded output voltage 4 7 10 %
Overvoltage Fault Propagation Delay
CSL_ driven 2% above overvoltage trip
threshold
1.5 µs
Output Undervoltage Threshold With respect to unloaded output voltage 60 70 80 %
Output Undervoltage-Lockout Time
From each SMPS enabled, with respect to
f
OSC
3300 4096 4700 Clks
Thermal-Shutdown Threshold Typical hysteresis = 10°C +150 °C
RESET
RESET Trip Threshold
With respect to unloaded output voltage,
falling edge; typical hysteresis = 1%
-7 -5.5 -4 %
RESET Propagation Delay
Falling edge, CSL_ driven 2% below RESET
trip threshold
1.5 µs
RESET Delay Time With respect to f OSC 27,000 32,000 37,000 Clks
INPUTS AND OUTPUTS
Feedback-Input Leakage Current FB3, FB5; SECFB = 2.6V 1 50 nA
Logic Input-Low Voltage
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC
0.6 V
Logic Input-High Voltage
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC
2.4 V
Input Leakage Current
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC, SEQ; V
PIN = 0V or 3.3V
±
1 µA
Logic Output-Low Voltage RESET, I
SINK = 4mA 0.4 V
Logic Output-High Current RESET = 3.5V 1 mA
TIME/ON5 Input Trip Level SEQ = 0 or V L 2.4 2.6 V
TIME/ON5 Source Current TIME/ON5 = 0, SEQ = 0 or V L 2.5 3 3.5 µA
TIME/ON5 On-Resistance TIME/ON5; RUN/ON3 = 0, SEQ = 0 or V
L
15 80 Ω
Gate-Driver Sink/Source Current DL3, DH3, DL5, DH5; forced to 2V 1 A
SSOP package 1.5 7
Gate-Driver On-Resistance High or low (Note 5)
QFN package 1.5 8
Ω