Low-Voltage, Precision Step-Down
Controller for Portable CPU Power
MAX1636
ABSOLUTE MAXIMUM RATINGS
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, 10sec) .............................+300°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.
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.)
PARAMETER
SMPS CONTROLLER
Input Voltage Range, V+
Input Voltage Range, VL
Input Voltage Range, V
CC
Output Voltage, Adj Mode
Output Voltage, Fixed 2.5V Mode
Output Voltage, Fixed 3.3V Mode
Output Adjustment Range
Current-Limit Threshold
Power Consumption
Shutdown Supply Current (V+)
FB Input Current
Soft-Start Ramp Time
Idle Mode Switchover Threshold
Input source for VL regulator
Gate-driver supply rail
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)
V
CC
= VL = 5V
V
CC
= 3.3V, VL = 5V
Positive direction
Negative direction
V
CC
= 5V, output not switching
V
CC
= 3.3V, output not switching
SHDN
= GND, OVP = GND
FB forced to REF
SHDN
to full current limit, five levels
CSH - CSL
20
-50
512
30
40
3
4.5
4.2
3.15
1.090
2.486
3.282
V
REF
V
REF
80
-145
100
-100
1.100
2.55
3.366
30
5.5
5.5
1.110
2.614
3.450
5.5
3.6
120
-55
2.0
1.5
10
50
V
V
V
V
V
V
V
mV
mV
mW
µA
nA
clks
mV
CONDITIONS
MIN
TYP
MAX
UNITS
2
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
