Rainbow Electronics MAX1813 - Manual (Page 7)

MAX1813
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
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Note 2: Output voltage accuracy specifications apply to DAC voltages from 0.6V to 2.0V.
Note 3: When the inductor is in continuous conduction, the output voltage will have a DC regulation level higher than the error-com-
parator threshold by 50% of the ripple. In discontinuous conduction (SKP/SDN = V
CC
, light load), the output voltage will
have a DC regulation level higher than the trip level by approximately 1.5% due to slope compensation.
Note 4: On-time and off-time specifications are measured from 50% to 50% at the DH pin, with LX forced to 0, BST forced to 5V,
and a 500pF capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times may be differ-
ent due to MOSFET switching speeds.
Note 5: Specifications to -40 °C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = +15V, V CC = V DD = 5V, VPCS = ZMODE = GND = PGND, SKP/SDN = CODE = V CC , V OUT set to 1.5V,
T A = -40 °C to +85°C, unless otherwise noted.) (Note 5)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
4-Level Logic Input High (V CC ) TON (200kHz operation), S0, S1
V CC -
0.4
V
4-Level Logic Input Upper-
Middle (Float)
TON (300kHz operation), S0, S1 2.8 3.85 V
4-Level Logic Input Lower-
Middle (REF)
TON (600kHz operation), S0, S1 1.65 2.35 V
4-Level Logic Low (GND) TON (1000kHz operation), S0, S1 0.5 V
SKP/SDN High Input Level
(Skip Mode)
2.8 6.0 V
SKP/SDN Float Input Level
(Forced-PWM Mode)
1.4 2.2 V
SKP/SDN Low Input Level
(Shutdown Mode)
0.5 V
SKP/SDN NO FAULT Input Level 12 15 V
SKP/SDN, 4-Level Logic Input
Current
SKP/SDN, TON, S0, S1 = GND or V CC -3 +3 µA