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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN to GND
45V
BST to GND
60V
PRE to GND
45V
SW to GND (Steady State)
-1.5V
BST to V
CC
45V
SD, V
CC to GND
14V
BST to SW
14V
OUT to GND
Limited to Vin
SYNC, SS, FB, RAMP to GND
7V
ESD Rating (Note 2)
Human Body Model
2kV
Storage Temperature Range
-65°C to +150°C
Operating Ratings (Note 1)
V
IN
6V to 42V
Operation Junction Temperature
40°C to + 150°C
Electrical Characteristics Specifications with standard typeface are for T
J = 25°C, and those with boldface type
apply over full Operating Junction Temperature range. V
IN = 24V, RT = 32.4k unless otherwise stated. (Note 3)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
STARTUP REGULATOR
VccReg
Vcc Regulator Output
6.85
7.15
7.5
V
Vcc LDO Mode turn-off
9
V
Vcc Current Limit
Vcc = 0V
25
mA
VCC SUPPLY
Vcc UVLO Threshold
(Vcc increasing)
5.01
5.35
5.69
V
Vcc Undervoltage Hysteresis
0.35
V
Bias Current (Iin)
FB = 1.3V
3.7
4.5
mA
Shutdown Current (Iin)
SD = 0V
48
70
A
SHUTDOWN THRESHOLDS
Shutdown Threshold
(SD Increasing)
0.43
0.7
0.9
V
Shutdown Hysteresis
0.1
V
Standby Threshold
(Standby Increasing)
1.15
1.225
1.30
V
Standby Hysteresis
0.1
V
SD Pull-up Current Source
5
A
SWITCH CHARACTERISTICS
Buck Switch Rds(on)
330
760
m
BOOST UVLO
4
V
BOOST UVLO Hysteresis
0.56
V
Pre-charge Switch Rds(on)
70
Pre-charge Switch on-time
250
ns
CURRENT LIMIT
Cycle by Cycle Current Limit
RAMP = 0V
1.8
2.1
2.7
A
Cycle by Cycle Current Limit Delay
RAMP = 2.5V
85
ns
SOFT-START
SS Current Source
7
10
14
A
OSCILLATOR
Frequency1
180
200
220
kHz
Frequency2
R
T = 11k
425
485
545
kHz
SYNC Source Impedance
11
k
SYNC Sink Impedance
110
SYNC Threshold (falling)
1.3
V
SYNC Frequency
R
T = 11k
550
kHz
SYNC Pulse Width Minimum
15
ns
5
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