MAX796 Maxim, MAX796 Datasheet - Page 3

• Manufacturer Part Number: MAX796
• Description: Step-Down Controllers with Synchronous Rectifier for CPU Power
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, GND = PGND = 0V, I VL = I REF = 0A, T
T
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 may increase due to excess PNP base current in the VL linear
A
OSCILLATOR AND INPUTS/OUTPUTS
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
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
Input Current
DL Sink/Source Current
DH Sink/Source Current
DL On-Resistance
DH On-Resistance
= -55°C to +125°C for MAX79_M, unless otherwise noted.)
regulator. This occurs only if V+ falls below the preset VL regulation point (5V nominal). See the Quiescent Supply Current
vs. Supply Voltage graph in the Typical Operating Characteristics .
PARAMETER
_______________________________________________________________________________________
Synchronous Rectifier for CPU Power
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
SYNC = REF
SYNC = 0V or 5V
Guaranteed by design
SYNC = REF
SYNC = 0V or 5V
SYNC
SHDN, SKIP
SYNC
SHDN, SKIP
SHDN, 0V or 30V
SECFB, 0V or 4V
SYNC, SKIP
CSH, CSL, CSH = CSL = 6V, device not shut down
FB, FB = REF
DL forced to 2V
DH forced to 2V, BST-LX = 4.5V
High or low
High or low, BST-LX = 4.5V
REF
< 100µA
Step-Down Controllers with
CONDITIONS
A
= 0°C to +70°C for MAX79_C, T
MAX79_C
MAX79_E/M
MAX79_C
MAX79_E/M
MAX79_C
MAX79_E/M
VL - 0.5
A
2.46
2.45
MIN
270
125
200
200
190
1.8
2.0
= 0°C to +85°C for MAX79_E,
89
93
2.505
TYP
300
150
0.1
4.8
91
96
1
1
1
1
4
1
1
±100
MAX
2.54
2.55
330
175
200
340
2.3
6.6
0.8
0.5
2.0
0.1
1.0
50
50
1
3
5
3
5
8
7
7
UNITS
mW
mW
kHz
kHz
mV
µA
µA
µA
µA
nA
ns
ns
ns
%
Ω
Ω
V
V
V
V
A
A
3