MAX797H Ver la hoja de datos (PDF) - Maxim Integrated
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MAX797H Datasheet PDF : 8 Pages
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High-Voltage, Step-Down Controller with
Synchronous Rectifier for CPU Power
ABSOLUTE MAXIMUM RATINGS
V+ to GND ................................................................-0.3V to 36V
GND to PGND........................................................................±2V
VL to GND...................................................................-0.3V to 7V
BST to GND ..............................................................-0.3V to 46V
DH to LX .....................................................-0.3V to (BST + 0.3V)
LX to BST ....................................................................-7V to 0.3V
SHDN to GND ...........................................................-0.3V to 36V
SYNC, SS, REF, FB, SKIP, DL to GND ...........-0.3V to (VL + 0.3V)
CSH, CSL to GND.......................................................-0.3V to 7V
VL Short Circuit to GND..............................................Momentary
REF Short Circuit to GND ...........................................Continuous
VL Output Current ...............................................................50mA
Continuous Power Dissipation (TA = +70°C)
SO (derate 8.70mW/°C above +70°C) ........................696mW
Operating Temperature Range
MAX797HESE .................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°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
(V+ = 15V, GND = PGND = 0V, IVL = IREF = 0A, TA = 0°C to +85°C, SYNC = 0V, unless otherwise noted.)
PARAMETER
CONDITIONS
+3.3V AND +5V STEP-DOWN CONTROLLERS
Input Supply Range
V+
High-side MOSFET drain
MIN TYP
4.5
5V Output Voltage (CSL)
0mV < (CSH - CSL) < 80mV, FB = VL,
6V < power input < 40V, includes line and load
regulation (Note 4)
4.85 5.10
3.3V Output Voltage (CSL)
0mV < (CSH - CSL) < 80mV, FB = 0V,
4.5V < power input < 40V, includes line and load
regulation (Note 4)
3.20 3.35
Nominal Adjustable Output
Voltage Range
External resistor divider
REF
Feedback Voltage
CSH - CSL = 0V
Load Regulation
0mV < (CSH - CSL) < 80mV
25mV < (CSH - CSL) < 80mV
Line Regulation
FB = VL, 6V < power input < 40V (Note 4)
FB = 0V, 4.5V < power input < 40V (Note 4)
Current-Limit Voltage
CSH - CSL, positive
CSH - CSL, negative
SS Source Current
SS Fault Sink Current
FINLTYEBRANCAKL/PRWEMGUCLOANTTORROALNLEDRREFERENCE
VL Output Voltage
SHDN = 2V, 0mA < IVL < 25mA, 5.5V < V+ < 30V
VL Fault Lockout Voltage
Rising edge, hysteresis = 15mV
VL/CSL Switchover Voltage
Rising edge, hysteresis = 25mV
2.43 2.505
2.5
1.5
0.04
0.04
80
100
-50 -100
2.5
4.0
2.0
4.7
3.8
4.2
MAX UNITS
30
V
40
5.25
V
3.46
V
6
V
2.57
V
%
0.06
%/V
0.06
120
mV
-160
6.5
µA
mA
5.3
V
4.1
V
4.7
V
2 _______________________________________________________________________________________
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