 English |
|
|
|
|
|
|
|
| MAX1638 Datasheet, PDF (2/16 Pages) Maxim Integrated Products – High-Speed Step-Down Controller with Synchronous Rectification for CPU Power | |||
| |||
| ◁ |
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)
NDRV, PDRV, DL to PGND.........................-0.3V to (VDD + 0.3V)
REF, CC1, CC2, LG, D0âD4, 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)
QSOP (derate 8.70mW/°C above +70°C) .....................696mW
QSOP θJC..................................................................40°C/W
SSOP (derate 8.00mW/°C above +70°C) .....................640mW
SSOP θJC ..................................................................45°C/W
Operating Temperature Range ...........................-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 = D4 = +5V, PGND = AGND = D0âD3 = 0V, FREQ = REF, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX
Output Voltage (FB) Accuracy
Input Voltage Range
Input Undervoltage Lockout
VCC Supply Current
Over line and load
(Note 1)
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 = 200mV
FB overdrive = 0V
DAC code = 11111
VREF = 0V
±1
±1.5
4.5
5.5
4.0
4.2
2.5
5
0.3
3.6
10
VDD Supply Current
VCC = VDD = 5.5V, FB forced 200mV above
regulation point, operating or standby mode
0.1
Reference Voltage
No load
3.465 3.5 3.535
Reference Load Regulation
0µA < IREF < 100µA
Reference Undervoltage Lockout Rising edge, 1% hysteresis
10
2.7
3.0
Reference Short-Circuit Current
AC Load Regulation
(Note 2)
DC Load Regulation
(Note 2)
PWROK Trip Level
PWROK Output Voltage Low
PWROK Output Current High
VREF = 0V
CSH - CSL =
0mV to 80mV
LG = GND
LG = REF
LG = VCC
CSH - CSL =
0mV to 80mV
LG = GND
LG = REF
LG = VCC
Rising FB, 1% hysteresis with respect to VREF
Falling FB, 1% hysteresis with respect to VREF
ISINK = 2mA, VCC = 4.5V
PWROK = 5.5V
0.5
4.0
0.5
1
2
0.05
0.1
0.2
-7.5
-6
-4.5
6.5
8
9.5
0.4
1
Switching Frequency
FREQ = VCC
FREQ = REF
850 1000 1150
540
600
660
FREQ = AGND
255
300
345
UNITS
%
V
V
mA
mA
V
mV
V
mA
%
%
%
V
µA
kHz
2 _______________________________________________________________________________________
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese