MAX798 データシートの表示（PDF） - Maxim Integrated
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MAX798 Datasheet PDF : 12 Pages
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High-Accuracy Step-Down Controller
with Synchronous Rectifier for CPU Power
ELECTRICAL CHARACTERISTICS
(V+ = +15V, GND = PGND = 0V, IVL = IREF = 0A, TA = -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETER
CONDITIONS
STEP-DOWN CONTROLLER
Input Supply Range
Nominal Adjustable Output
Voltage Range
External resistor divider
Feedback Voltage
Load Regulation
Line Regulation
CSH - CSL = 40mV, SKIP = VL
0mV < (CSH - CSL) < 80mV, SKIP = VL
6V < V+ < 30V
Current-Limit Voltage
CSH - CSL, positive
CSH - CSL, negative
INTERNAL REGULATOR AND REFERENCE
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 Cycle
SYNC = REF
SYNC = 0V or 5V
DL On-Resistance
High or low
DH On-Resistance
High or low, BST - LX = 4.5V
MIN TYP
5.0
1.6
1.560 1.6
0.04
70
-40 -100
4.7
3.75
4.15
2.438
2.505
1
1
6.4
250
300
110
150
250
250
210
88
91
92
96
MAX UNITS
30
6.0
1.640
±1
0.06
130
-160
V
V
V
%
%/ V
mV
5.3
V
4.05
V
4.75
V
2.562
V
30
mV
10
µA
10
µA
9.1
mW
350
kHz
190
ns
ns
320
kHz
%
7
Ω
7
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). The typical maximum quiescent
current in dropout will not exceed 16mA.
Note 3: All -40°C to +85°C specifications above are guaranteed by design.
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