LM25574_0703 NSC [National Semiconductor], LM25574_0703 Datasheet - Page 4

• Manufacturer Part Number: LM25574_0703
• Manufacturer: NSC [National Semiconductor]

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STARTUP REGULATOR
VCC SUPPLY
SHUTDOWN THRESHOLDS
SWITCH CHARACTERSICS
CURRENT LIMIT
SOFT-START
OSCILLATOR
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
BST to GND
PRE to GND
SW to GND (Steady State)
BST to V
SD, V
Electrical Characteristics
apply over full Operating Junction Temperature range. V
IN
Symbol
VccReg
to GND
CC
to GND
CC
Vcc Regulator Output
Vcc LDO Mode turn-off
Vcc Current Limit
Vcc UVLO Threshold
Vcc Undervoltage Hysteresis
Bias Current (Iin)
Shutdown Current (Iin)
Shutdown Threshold
Shutdown Hysteresis
Standby Threshold
Standby Hysteresis
SD Pull-up Current Source
Buck Switch Rds(on)
BOOST UVLO
BOOST UVLO Hysteresis
Pre-charge Switch Rds(on)
Pre-charge Switch on-time
Cycle by Cycle Current Limit
Cycle by Cycle Current Limit Delay
SS Current Source
Frequency1
Frequency2
SYNC Source Impedance
SYNC Sink Impedance
SYNC Threshold (falling)
SYNC Frequency
SYNC Pulse Width Minimum
Parameter
45V
60V
45V
-1.5V
45V
14V
Specifications with standard typeface are for T
(Note 1)
IN
Vcc = 0V
(Vcc increasing)
FB = 1.3V
SD = 0V
(SD Increasing)
(Standby Increasing)
RAMP = 0V
RAMP = 2.5V
R
R
= 24V, R
T
T
4
= 11kΩ
= 11kΩ
Conditions
V
Operation Junction Temperature
BST to SW
OUT to GND
SYNC, SS, FB, RAMP to GND
ESD Rating (Note 2)
Storage Temperature Range
Operating Ratings
IN
Human Body Model
T
= 32.4kΩ unless otherwise stated. (Note 3)
6.85
5.03
0.47
1.17
Min
180
425
550
0.6
J
15
7
= 25°C, and those with boldface type
1.225
7.15
5.35
0.35
0.56
Typ
750
250
200
485
110
3.7
0.7
0.1
0.1
0.7
1.3
(Note 1)
25
48
70
75
10
11
9
5
4
1500
−40°C to + 125°C
Max
7.45
5.67
1.28
14V
Limited to Vin
7V
2kV
-65°C to +150°C
220
545
4.5
0.9
0.8
70
14
6V to 42V
Units
kHz
kHz
kHz
mΩ
mA
mA
µA
µA
µA
kΩ
ns
ns
ns
Ω
Ω
V
V
V
V
V
V
V
V
V
V
A
V