MAX798 Maxim, MAX798 Datasheet - Page 2

• Manufacturer Part Number: MAX798
• Description: High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power
• Manufacturer: Maxim

ABSOLUTE MAXIMUM RATINGS
V+ to GND .................................................................-0.3V, +36V
GND to PGND........................................................................±2V
VL to GND ...................................................................-0.3V, +7V
BST to GND ...............................................................-0.3V, +36V
DH to LX ........................................................-0.3V, (BST + 0.3V)
LX to BST.....................................................................-7V, +0.3V
SHDN to GND............................................................-0.3V, +36V
SYNC, SS, REF, SKIP, DL to GND ...................-0.3V, (VL + 0.3V)
CSH, CSL to GND .......................................................-0.3V, +7V
VL Short Circuit to GND..............................................Momentary
ELECTRICAL CHARACTERISTICS
(V+ = +15V, GND = PGND = 0V, I
High-Accuracy 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
STEP-DOWN CONTROLLER
INTERNAL REGULATOR AND REFERENCE
Input Supply Range
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
Reference Output Voltage
Reference Fault Lockout Voltage
Reference Load Regulation
CSL Shutdown Leakage Current
V+ Shutdown Current
V+ Off-State Leakage Current
Dropout Power Consumption
Quiescent Power Consumption
_______________________________________________________________________________________
PARAMETER
VL
External resistor divider
CSH - CSL = 40mV, SKIP = VL
0mV < (CSH - CSL) < 80mV, SKIP = VL
6V < V+ < 30V
CSH - CSL, positive
CSH - CSL, negative
SHDN = 2V, 0mA <I
Rising edge, hysteresis = 15mV
Rising edge, hysteresis = 25mV
No external load (Note 1)
Falling edge
0µA < I
SHDN = 0V, CSL = 6V, V+ = 0V or 30V, VL = 0V
SHDN = 0V, V+ = 30V, CSL = 0V or 6V
FB = CSH = CSL = 6V, VL switched over to CSL
V+ = 4V, CSL = 0V (Note 2)
CSH = CSL = 6V
= I
REF
REF
= 0A, T
< 100µA
A
= 0°C to +85°C, unless otherwise noted.)
VL
CONDITIONS
< 25mA, 5.5V < V+ < 30V
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
MAX798ESE....................................................-40°C to +85°C
1.576
2.463
4.75
MIN
4.5
1.6
-40
2.0
2.0
3.8
4.2
1.8
80
A
= +70°C)
2.505
TYP
0.04
-100
100
1.6
4.0
0.1
6.6
6.4
1
1
1.624
2.537
MAX
±0.4
-160
0.05
5.25
10.5
120
6.5
4.0
4.7
2.3
8.5
30
20
6
1
5
5
UNITS
%/V
mW
mW
mA
mV
mV
µA
µA
µA
µA
%
V
V
V
V
V
V
V
V