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LM25005 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM25005
Description  42V, 2.5A STEP-DOWN SWITCHING REGULATOR
PDF  21 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM25005 Datasheet(HTML) 5 Page - National Semiconductor (TI)

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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
V
CC to GND
14V
BST to SW
14V
OUT to GND
Limited to Vin
SD, SYNC, SS, FB 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
7V to 42V
Operation Junction Temperature
−40˚C to + 125˚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
Ω unless otherwise stated. (Note 3)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
STARTUP REGULATOR
VccReg
Vcc Regulator Output
6.85
7.15
7.45
V
Vcc LDO Mode turn-off
9
V
Vcc Current Limit
Vcc = 0V
20
mA
VCC SUPPLY
Vcc UVLO Threshold
(Vcc increasing)
5.95
6.35
6.75
V
Vcc Undervoltage Hysteresis
1
V
Bias Current (Iin)
FB = 1.3V
3
4.5
mA
Shutdown Current (Iin)
SD = 0V
50
85
µA
SHUTDOWN THRESHOLDS
Shutdown Threshold
(SD Increasing)
0.5
0.7
0.9
V
Shutdown Hysteresis
0.1
V
Standby Threshold
(Standby Increasing)
1.18
1.225
1.27
V
Standby Hysteresis
0.1
V
SD Pull-up Current Source
5
µA
SWITCH CHARACTERSICS
Buck Switch Rds(on)
160
320
m
Ω
BOOST UVLO
3.8
V
BOOST UVLO Hysteresis
0.56
V
Pre-charge Switch Rds(on)
75
Ω
Pre-charge Switch on-time
275
ns
CURRENT LIMIT
Cycle by Cycle Current Limit
RAMP = 0V
3
3.5
4.25
A
Cycle by Cycle Current Limit Delay
RAMP = 2.5V
100
ns
SOFT-START
SS Current Source
7
10
14
µA
OSCILLATOR
Frequency1
180
200
220
KHz
Frequency2
RT = 11k
Ω
425
485
525
KHz
SYNC Source Impedance
10
k
Ω
SYNC Sink Impedance
160
Ω
SYNC Threshold (falling)
1.4
V
Upper SYNC Frequency
550
KHz
SYNC Pulse Width Minimum
15
ns
www.national.com
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