mV
MAX1636
Low-Voltage, Precision Step-Down
Controller for Portable CPU Power
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(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.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V+ to GND ...............................................................-0.3V to 36V
GND to PGND........................................................................±2V
SHDN to GND. ......................................................... -0.3V to 36V
LX, BST to GND. ...................................................... -0.3V to 36V
DH, BST to LX .............................................................-0.3V to 6V
VL, V
CC
, CSL, CSH, FB, SKIP to GND ...................... -0.3V to 6V
DL to GND.. ..................................................-0.3V to (VL + 0.3V)
REF, RESET, SYNC, CC, OVP to GND. ..... -0.3V to (V
CC
+ 0.3V)
VL Output Current... ............................................................50mA
VL Short Circuit to GND..............................................Momentary
REF Output Current ............................................................20mA
REF Short Circuit to GND ....... ......................................Indefinite
Continuous Power Dissipation (T
A
= +70°C)
SSOP (derate 8.00mW/°C above +70°C) .....................640mW
Operating Temperature Range
MAX1636EAP. ..................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Gate-driver supply rail
CSH - CSL
Input source for VL regulator
SHDN to full current limit, five levels
FB forced to REF
Positive direction
SHDN = GND, OVP = GND
V
CC
= 3.3V, output not switching
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)
V
CC
= 5V, output not switching
FB tied to GND, 0mV < (CSH - CSL) < 80mV, 4.5V
< V+ < 30V (includes line and load regulation)
Negative direction
CONDITIONS
mV20 30 40Idle Mode Switchover Threshold
clks512Soft-Start Ramp Time
nA-50 50FB Input Current
µA310Shutdown Supply Current (V+)
1.5
Power Consumption
2.0
-145 -100 -55
V4.2 5.5Input Voltage Range, VL
V4.5 30Input Voltage Range, V+
mV
80 100 120
Current-Limit Threshold
V
REF
3.6
V
V
REF
5.5
Output Adjustment Range
V3.15 5.5Input Voltage Range, V
CC
V1.090 1.100 1.110Output Voltage, Adj Mode
V2.486 2.55 2.614 Output Voltage, Fixed 2.5V Mode
V3.282 3.366 3.450Output Voltage, Fixed 3.3V Mode
UNITSMIN TYP MAXPARAMETER
mW
SMPS CONTROLLER
