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LM2637 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM2637
Description  Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2637 Datasheet(HTML) 2 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
CC
7V
V
DD
17V
Junction Temperature
150˚C
Power Dissipation (Note 2)
1.6W
Storage Temperature
−65˚C to +150˚C
ESD Susceptibility
2.5 kV
Soldering Time, Temperature (10 sec.)
300˚C
Operating Ratings (Note 1)
V
CC
4.75V to 5.25V
Junction Temperature Range
0˚C to +125˚C
Electrical Characteristics
V
CC = 5V, VDD = 12V unless otherwise specified. Typicals and limits appearing in plain type apply for TA = TJ = +25˚C. Limits
appearing in boldface type apply over the 0˚C to +70˚C range.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
EN
EN Pin internal Pull-Up Current
60
90
140
µA
I
VID
VID Pins internal Pull-Up
Current
60
90
140
µA
I
CC
Operating V
CCCurrent
EN = 5V, VID = 10111
6
7.5
mA
I
Q_VCC
V
CC Shutdown Current
EN = 0V, VID Pins Floating
1.5
3
mA
SWITCHING SECTION
V
DACOUT
5-Bit DAC Output Voltage
(Note 3)
N−1.5%
NN+1.5%
V
I
Q_VDD
V
DD Shutdown Current
EN = 0V, VID Pins Floating
4
µA
f
OSC
Oscillator Frequency
RT = 100 k
204
245
286
kHz
RT = 25 k
1000
D
MAX
Maximum Duty Cycle
95
%
D
MIN
Minimum Duty Cycle
0
%
R
SNS1
SNS1 Pin Resistance to
Ground
8.5
10
13
k
R
DS_SRC
Gate Driver Resistance When
Sourcing Current
6
R
DS_SINK
Gate Driver Resistance When
Sinking Current
1.5
V
CC_TH1
Rising V
CC Threshold for
Power-On Reset
4
4.3
V
V
CC_TH2
Falling V
CC Threshold for
Power-On Reset
3.0
3.6
V
V
DAC_IH
DAC Input High Voltage
3.5
V
V
DAC_IL
DAC Input Low Voltage
1.3
V
t
PWGD
PWGD Response Time
SNS1 Rises from 0V to Rated
Output Voltage
2
8.4
15
µs
t
PWBAD
PWGD Response Time
SNS1 Falls from Rated Output
Voltage to 0V
2
3.4
10
µs
V
PWGD_HI
PWGD High Trip Point
% Above Rated Output Voltage
when output Voltage
11.5
13
%
% Above Rated Output Voltage
when output Voltage
(Note 4)
5
7
9
V
PWGD_LO
PWGD Low Trip Point
% Below Rated Output Voltage
when output Voltage
2.6
6
%
% Below Rated Output Voltage
when output Voltage
(Note 4)
6
9.5
13
V
OVP_TRP
OVP Pin Trip Point
% SNS1 Above Rated Output
15
18
21
%
I
CS+
CS+ Pin Sink Current
CS+ = 5V
126
185
244
µA
V
OCP
Over-Current Trip Point (CS+
and CS− Differential Voltage)
CS+ = 2V, CS− Drops from 2V
41
55
69
mV
www.national.com
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