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| MAX1639 Datasheet, PDF (2/13 Pages) Maxim Integrated Products – High-Speed Step-Down Controller with Synchronous Rectification for CPU Power | |||
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High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
ABSOLUTE MAXIMUM RATINGS
VDD, VCC, PWROK to AGND....................................-0.3V to +6V
PGND to AGND ..................................................................±0.3V
CSH, CSL to AGND ....................................-0.3V to (VCC + 0.3V)
DL to PGND................................................-0.3V to (VDD + 0.3V)
REF, CC1, CC2, FREQ, FB to AGND .........-0.3V to (VCC + 0.3V)
BST to PGND..........................................................-0.3V to +12V
BST to LX..................................................................-0.3V to +6V
DH to LX.............................................(LX - 0.3V) to (BST + 0.3V)
Continuous Power Dissipation (TA = +70°C)
16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ....696mW
SO θJC...........................................................................65°C/W
Operating Temperature Range
MAX1639ESE....................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under âAbsolute Maximum Ratingsâ 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
(VDD = VCC = +5V, PGND = AGND = 0V, FREQ = REF, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP
FB Voltage
Input Voltage Range
Input Undervoltage Lockout
VCC Supply Current (ICC)
Includes line and load
regulation errors
TA = +25°C to +85°C
TA = 0°C to +85°C
VCC = VDD
VCC rising edge, 1% hysteresis
VCC = VDD
= 5.5V
Operating
mode
Shutdown
mode
FB overdrive = 60mV
FB overdrive = 0V
VREF = 0V
1.089
1.083
4.5
4.0
5
3.6
VDD Supply Current (IDD)
VCC = VDD = 5.5V, FB forced 60mV above
regulation point, operating or standby mode
Reference Voltage
Reference Load Regulation
Reference Undervoltage Lockout
Reference Short-Circuit Current
AC Load Regulation
DC Load Regulation
PWROK Trip Level
PWROK Output Voltage Low
PWROK Output Current High
Switching Frequency
Maximum Duty Cycle
FREQ Input Voltage
FREQ Input Voltage
No load
0µA < IREF < 100µA
Rising edge, 1% hysteresis
VREF = 0V
CSH - CSL = 0mV to 80mV
CSH - CSL = 0mV to 80mV
Rising FB, 1% hysteresis with respect to VREF
Falling FB, 1% hysteresis with respect to VREF
ISINK = 2mA, VCC = 4.5V
PWROK = 5.5V
FREQ = VCC
FREQ = REF
FREQ = AGND
FREQ = VCC
GND (low)
REF (mid)
VCC (high)
3.465 3.5
2.7
0.5
1
0.1
-7.5
-6
6.5
8
850 1000
540
600
255
300
85
90
3.3
VCC - 0.1
MAX
1.111
1.117
5.5
4.2
2.5
10
0.1
3.535
10
3.0
4.0
-4.5
9.5
0.4
1
1150
660
345
0.2
3.7
UNITS
V
V
V
mA
mA
V
mV
V
mA
%
%
%
V
µA
kHz
%
V
2 _______________________________________________________________________________________
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