Rainbow Electronics MAX1802 - Manual (Page 5)

MAX1802
Digital Camera Step-Down
Power Supply
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PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
AUXILIARY DC-DC CONTROLLERS 1, 2, 3 (V ON1 = V CON _ = 3V)
INTERNAL CLOCK
OSC Clock Low Trip Level OSC falling edge 0.2 0.25 0.3 V
V DCON _ = 0.625V 0.575 0.625 0.675
OSC Clock High Trip Level
V DCON _ = 1.25V to V VL 1.00 1.05 1.10
V
Maximum Duty Cycle
Adjustment Range
40 90 %
Maximum Duty Cycle V
DCON
_ = 0.625V 43 %
Default Maximum Duty Cycle V DCON _ = 1.25V to V VL 76 %
DCON_ Input Leakage Current V DCON _ = 0V to 3V 0.01 1 µA
DCON_ Input Sleep-Mode
Threshold
V DCON _ rising, 50mV hysteresis 0.35 0.4 0.45 V
AUXILIARY ERROR AMPLIFIER
FB_ Regulation Voltage Unity gain configuration, FB_ = COMP_ 1.233 1.248 1.263 V
FB_ to COMP_
Transconductance
G EA
Unity gain configuration, FB_ = COMP_,
-5µA < ILOAD < 5µA
70 100 160 µs
FB_ Input Leakage Current V FB _ = 1.35V 5 100 nA
AUXILIARY DRIVERS (DL1, DL2, DL3)
DL_ Driver Resistance Output high or low 4 11 Ω
DL_ Drive Current Sourcing or sinking, V
DL
_ = V
VDDC
/ 2 400 mA
AUXILIARY SOFT-START
Soft-Start Interval 1024
OSC
cycles
AUXILIARY SHORT-CIRCUIT PROTECTION
Fault Interval 1024
OSC
cycles
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V VDDM = 6V, V VDDC = 3V, PGNDM = PGND = GND, DCON1 = REF, V ONM = 3V, V ONC = V ON1 = V DCON2 =
V DCON3 = 0, T A = 0°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)