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LM2638M Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM2638M
Description  Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers
PDF  8 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2638M 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
3 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 T
A = 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
CC
Operating V
CC Current
EN = 5V, VID = 10111
6
7.5
mA
I
Q_VCC
V
CC Shutdown Current
EN = 0V, VID Pins Floating
1.5
3
mA
I
Q_VDD
V
DD Shutdown Current
EN = 0V, VID Pins Floating
4
µA
R
DS_CP
CP Pin Resistance
High Side FET
100
Ω
Low Side FET
10
SWITCHING SECTION
V
DACOUT
5-Bit DAC Output Voltage
(Note 3)
N−1.5%
NN+1.5%
V
I
VID
VID Pins Internal Pull-up
Current
60
90
140
µA
f
OSC
Oscillator Frequency
RT = 100 k
Ω
204
245
286
kHz
RT = 25 k
Ω
1000
D
MAX
Maximum Duty Cycle
100
%
D
MIN
Minimum Duty Cycle
0
%
R
SNS1
SNS1 Pin Resistance to
Ground
8.5
10
13
k
Ω
R
DS_SRC
Gate Driver Resistance When
Sourcing Current
6
Ω
R
DS_SINK
Gate Driver Resistance When
Sinking Current
1.5
Ω
V
CC_TH1
V
CC Power-On-Reset
Threshold
4.0
4.3
V
V
CC_TH2
V
CC Shutdown Threshold
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
GA
Error Amplifier DC Gain
76
dB
BW
EA
Error Amplifier Unity Gain
Bandwidth
5
MHz
V
RAMP_L
Ramp Signal Valley Voltage
1.25
V
V
RAMP_H
Ramp Signal Peak Voltage
3.25
V
t
SS
Soft Start Time
4096
Clock
Cycles
D
STEP_SS
Duty Cycle Step Change during
Soft Start
12.5
%
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
www.national.com
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