MAX1636
Low-Voltage, Precision Step-Down
Controller for Portable CPU Power
4 _______________________________________________________________________________________
Gate-driver supply rail
Input source for VL regulator
V
CC
= 3.3V, VL = 5V
V
CC
= VL = 5V
Internal chip supply rail
FB tied to V
OUT
, 0mV < (CSH - CSL) < 80mV, 4.5V
< V+ < 30V (includes line and load regulation)
FB tied to V
CC
, 0mV < (CSH - CSL) < 80mV, 4.5V
< V+ < 30V (includes line and load regulation)
FB tied to GND, 0mV < (CSH - CSL) < 80mV, 4.5V
< V+ < 30V (includes line and load regulation)
CONDITIONS
V4.2 5.5Input Voltage Range, VL
V4.5 30Input Voltage Range, V+
V
REF
3.6
V
V
REF
5.5
Output Adjustment Range
V3.15 5.5Input Voltage Range, V
CC
V1.086 1.114Output Voltage, Adj Mode
V2.432 2.635 Output Voltage, Fixed 2.5V Mode
V3.195 3.497Output Voltage, Fixed 3.3V Mode
UNITSMIN TYP MAXPARAMETER
High or low, DH or DL
DH or DL forced to 2V
CSH = CSL = 5V, V+ = VL = V
CC
=
GND, either CSH or CSL input
CONDITIONS
Ω7Gate-Driver On-Resistance
A1Gate-Driver Sink/Source Current
µA10
Current-Sense Input
Leakage Current
UNITSMIN TYP MAXPARAMETER
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, SYNC = VL = V
CC
, I
VL
= 0mA, I
REF
= 0mA, T
A
= 0°C to +85°C, unless otherwise noted. Typical values
are at T
A
= +25°C.)
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = 15V, SYNC = VL = V
CC
, I
VL
= 0mA, I
REF
= 0mA, T
A
=-40°C to +85°C, unless otherwise noted.) (Note 1)
V
CC
= 5V, I(VL) = 0
µA
60
Regulator Supply Current (V+)
V
CC
= 5V, I(VL) = 0, V+ = 4.5V
(includes PNP base current)
SHDN = GND, OVP = V
CC
µA60Standby Supply Current (V+)
I(VL) = 0 to 25mA, 6V < V+ < 30V
V
4.7 5.3
I(VL) = 0 to 25mA, 5V < V+ < 30V
VL Output Voltage
Rising edge, hysteresis = 25mV V3.45 3.91
4.5 5.3
VL Undervoltage Lockout
Threshold
500
V
CC
= 5V, output not switching
Positive direction
2.0
mV70 130Current-Limit Threshold
V
CC
= 3.3V, output not switching 1.5
Power Consumption mW
SMPS CONTROLLER
INTERNAL VL REGULATOR AND REFERENCE
