MAX746 Maxim, MAX746 Datasheet - Page 3

• Manufacturer Part Number: MAX746
• Description: High-Efficiency / PWM / Step-Down / N-Channel DC-DC Controller
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(V+ = 10V, I
Note 1:
Note 2:
Maximum Duty Cycle
Charge-Pump Output Voltage
Current-Sense Amplifier
Current-Limit Threshold
EXT Output High
EXT Output Low
EXT Sink Current
EXT Source Current
Compensation Pin Impedance
LBI Threshold Voltage
LBO Output Voltage Low
LBI Input Leakage Current
LBO Output Leakage Current
SHDN Input Voltage Low
SHDN Input Voltage High
SHDN Input Leakage Current
PARAMETER
The soft-start fault current is the current sink capability of SS when V
I
doubles the current drawn by HIGH from the V+ input, so I
SUPP
LOAD
is the supply current drawn by V+, which includes the current drawn by the charge pump. The charge pump
= 0A, I
_______________________________________________________________________________________
REF
= 0 A, T
SYMBOL
V
V
HIGH
A
V
LIMIT
V
V
High-Efficiency, PWM, Step-Down,
= T
OL
IH
IL
MIN
to T
V+ = 6V
I
V+ – CS
V
V
V
V
LBI falling
I
LBI = 2.5V
V+ = 15V, LBO = 15V, LBI = 2.5V
SHDN = 10V
HIGH
SINK
HIGH
HIGH
HIGH
HIGH
MAX
= 0.5mA
= 0mA to 10mA
forced to 15V, I
forced to 15V, I
= 15V, V
= 15V, V
, unless otherwise noted.)
N-Channel DC-DC Controller
EXT
EXT
CONDITIONS
= 12.5V
= 2.5V
SUPP
EXT
EXT
= -1mA
= 1mA
= I
V+
REF
+ 2I
MAX746C
MAX746E/M
< 1V or when the device is in shutdown.
HIGH
.
V+ + 4
V
HIGH
1.97
1.96
MIN
125
2.0
91
- 0.1
V+ + 5 V+ + 6
TYP
2.00
2.00
150
160
270
0.1
96
24
0.25
2.03
2.04
MAX
175
100
100
0.4
0.4
1
UNITS
mA
mA
mV
k
%
nA
nA
V
V
V
V
V
V
V
A
3