MAX797H Maxim, MAX797H Datasheet - Page 2

• Manufacturer Part Number: MAX797H
• Description: High-Voltage / Step-Down Controller with Synchronous Rectifier for CPU Power
• Manufacturer: Maxim

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
ELECTRICAL CHARACTERISTICS
(V+ = 15V, GND = PGND = 0V, I VL = I REF = 0A, T
High-Voltage, Step-Down Controller with
Synchronous Rectifier for CPU Power
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.
2
+3.3V AND +5V STEP-DOWN CONTROLLERS
FLYBACK/PWM CONTROLLER
INTERNAL REGULATOR AND REFERENCE
Input Supply Range
5V Output Voltage (CSL)
3.3V Output Voltage (CSL)
Nominal Adjustable Output
Voltage Range
Feedback Voltage
Load Regulation
Line Regulation
Current-Limit Voltage
SS Source Current
SS Fault Sink Current
VL Output Voltage
VL Fault Lockout Voltage
VL/CSL Switchover Voltage
_______________________________________________________________________________________
PARAMETER
V+
High-side MOSFET drain
0mV < (CSH - CSL) < 80mV, FB = VL,
6V < power input < 40V, includes line and load
regulation (Note 4)
0mV < (CSH - CSL) < 80mV, FB = 0V,
4.5V < power input < 40V, includes line and load
regulation (Note 4)
External resistor divider
CSH - CSL = 0V
0mV < (CSH - CSL) < 80mV
25mV < (CSH - CSL) < 80mV
FB = VL, 6V < power input < 40V (Note 4)
FB = 0V, 4.5V < power input < 40V (Note 4)
CSH - CSL, positive
CSH - CSL, negative
SHDN = 2V, 0mA < I
Rising edge, hysteresis = 15mV
Rising edge, hysteresis = 25mV
A
= 0°C to +85°C, SYNC = 0V, unless otherwise noted.)
VL
CONDITIONS
< 25mA, 5.5V < V+ < 30V
VL Short Circuit to GND..............................................Momentary
REF Short Circuit to GND ...........................................Continuous
VL Output Current ...............................................................50mA
Continuous Power Dissipation (T
Operating Temperature Range
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
SO (derate 8.70mW/°C above +70°C) ........................696mW
MAX797HESE .................................................-40°C to +85°C
4.85
3.20
2.43
MIN
REF
4.5
-50
2.5
2.0
4.7
3.8
4.2
80
A
= +70°C)
2.505
-100
TYP
5.10
3.35
0.04
0.04
100
2.5
1.5
4.0
MAX
5.25
3.46
2.57
0.06
0.06
-160
120
6.5
5.3
4.1
4.7
30
40
6
UNITS
%/V
mV
mA
µA
%
V
V
V
V
V
V
V
V