High-Accuracy Step-Down Controller
with Synchronous Rectifier for CPU Power
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +15V, GND = PGND = 0V, I
VL
= I
REF
= 0A, T
A
= 0°C to +85°C, unless otherwise noted.)
PARAMETER
Oscillator Frequency
SYNC High Pulse Width
SYNC Low Pulse Width
SYNC Rise/Fall Time
Oscillator Sync Range
Maximum Duty Cycle
Input High Voltage
Input Low Voltage
SYNC = REF
SYNC = 0V or 5V
SYNC
SHDN, SKIP
SYNC
SHDN, SKIP
SHDN,
0V or 30V
Input Current
SYNC,
SKIP
CSH, CSL, CSH = CSL = 4V, device not shut down
FB, FB = 1.6V
DL Sink/Source Current
DH Sink/Source Current
DL On-Resistance
DH On-Resistance
DL forced to 2V
DH forced to 2V, BST - LX = 4.5V
High or low
High or low, BST - LX = 4.5V
1
1
7
7
Guaranteed by design
195
89
93
VL - 0.5
2.0
0.8
0.5
2
1
50
±100
nA
A
A
Ω
Ω
91
96
SYNC = REF
SYNC = 0V or 5V
CONDITIONS
MIN
270
125
200
200
200
340
TYP
300
150
MAX
330
175
UNITS
kHz
ns
ns
ns
kHz
%
V
V
µA
µA
MAX798
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3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
