Rainbow Electronics MAX1774 - Manual (Page 7)

MAX1774
Dual, High-Efficiency, Step-Down
Converter with Backup Battery Switchover
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PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
CVL, CVH REGULATORS
CVL Output Voltage V CVL I CVL = 50mA, V CS- = 0 2.6 3.1 V
CVL Switchover Threshold V CS- rising, hysteresis = 100mV typical 2.40 2.55 V
V IN = +4V, I CVH = 25mA V IN - 2.8
CVH Output Voltage V CVH
V IN = +12V, I CVH = 50mA V IN - 3.65
V
V
CVL
rising 2.40 2.57
CVL Undervoltage Lockout
V CVL falling 2.30 2.47
V
LOW-VOLTAGE COMPARATORS
V BKOFF rising 0.51 0.59 Backup Regulator Shutdown
Threshold
V BKOFF
V BKOFF falling 0.46 0.54
V
BKOFF Input Bias Current V BKOFF = +5.5V 1 µA
LBI Threshold V
LBI
V
LBI
falling, hysteresis = 50mV typical 1.17 1.23 V
DBI Threshold V DBI V DBI falling, hysteresis = 50mV typical 1.17 1.23 V
BKUP Low-Input Threshold 0.4 V
LBI, DBI Input Leakage Current V LBI , V DBI = +28V 100 nA
LBO, BKUP, ACO, MDRV
Output Low
I SINK = 1mA 0.4 V
LBO, BKUP, ACO, MDRV
Output Leakage Current V LBI = +1.3V, V ACI = V IN = +12V, V ACO =
V LBO = V BKUP = +5.5V, V MDRV = +28V
1.0 µA
ACI Threshold V ACI - V INS , ACI falling 0.5 V
ACI Input Leakage Current V ACI = +1.3V 100 nA
MAIN Input Leakage Current V INS = +3.3V 10 µA
LOGIC INPUTS
SHDNM, SHDNC Input Low
Voltage
0.4 V
SHDNM, SHDNC Input High
Voltage
2.0 V
SHDNM, SHDNC Input Low
Current
SHDNM = SHDNC = GND -1 1 µA
SHDNC Input High Current V SHDNC = +5.5V 5 µA
SHDNM Input High Current V SHDNM = +28V 25 µA
ELECTRICAL CHARACTERISTICS (continued)
(Figure 1, V IN = V INS = +12V, V INC = V CS+ = V CS- = +3.3V, V CORE = +1.8V, T A = -40°C to +85°C, unless otherwise noted.) (Note 2)
Note 1: This parameter is guaranteed based on the LXC P-channel current limit and the LXC N-channel valley current.
Note 2: Specifications to -40°C are guaranteed by design and not production tested.