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
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, GND = PGND = 0V, IVL = IREF = 0A, TA = -40 to +85°C, SYNC = 0V, unless otherwise noted.) (Note 3)
PARAMETER
CONDITIONS
+3.3V and +5V STEP-DOWN CONTROLLERS
Input Supply Range
V+
High-side MOSFET drain
5V Output Voltage (CSL)
0mV < (CSH - CSL) < 80mV, FB = VL,
6V < power input < 40V, includes line and load
regulation (Note 4)
MIN TYP
5.0
4.70 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)
3.10 3.35
Nominal Adjustable Output
Voltage Range
External resistor divider
Feedback Voltage
CSH - CSL = 0V
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
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
Reference Output Voltage
No external load (Note 1)
Reference Load Regulation
V+ Shutdown Current
0µA < IREF < 100µA
SHDN = 0V, V+ = 30V, CSL = 0V or 6V
V+ Off-State Leakage Current FB = CSH = CSL = 6V, VL switched over to CSL
Quiescent Power Consumption CSH = CSL = 6V
OSCILLATOR AND INPUTS/OUTPUTS
Oscillator Frequency
SYNC = REF
SYNC = 0V or 5V
SYNC High Pulse Width
SYNC Low Pulse Width
Oscillator Sync Range
Maximum Duty Factor
SYNC = REF
SYNC = 0V or 5V
DL On-Resistance
High or low
DH On-Resistance
High or low, BST - LX = 4.5V
REF
2.40
0.04
0.04
70
-40 -100
4.7
3.75
4.2
2.43 2.505
1
1
4.8
250
300
120
150
250
250
210
89
91
93
96
MAX
30
40
5.40
3.56
6.0
2.60
0.06
0.06
130
-160
5.3
4.15
4.7
2.57
50
10
10
8.4
350
180
320
7
7
UNITS
V
V
V
V
V
%/V
%/V
mV
V
V
V
V
mV
µA
µA
mW
kHz
ns
ns
kHz
%
Ω
Ω
Note 1: Since the reference uses VL as its supply, V+ line-regulation error is insignificant.
Note 2: At very low input voltages, quiescent supply current can increase due to excess PNP base current in the VL linear
regulator. This occurs only if V+ falls below the preset VL regulation point (5V nominal).
Note 3: All -40°C to +85°C specifications are guaranteed by design.
Note 4: The power input is the high-side MOSFET drain.
4 _______________________________________________________________________________________
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