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LM2688 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM2688
Description  Non-synchronous Step-down Controller for Pentium Microprocessors
PDF  8 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2688 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.
Maximum Supply Volatge
45V
ON/OFF Pin Input Voltage
−0.3V
≤ V ≤ +25V
Feedback Pin Voltage
−0.3V
≤ V ≤ +25V
Output Voltage to Ground
(Steady State)
−1V
Power Dissipation
Internally Limited
Storage Temperature Range
−65˚C to +150˚C
ESD Susceptibility
Human Body Model (Note 2)
2 kV
Lead Temperature
M8 Package
Vapor Phase (60 seconds)
+215˚C
Infrared (15 seconds)
+220˚C
Maximum Junction Temperature
+150˚C
Operating Ratings
Temperature Range
−40˚C
≤ T
J ≤ +125˚C
Supply Voltage
4.5V to 40V
LM2688-ADJ
Electrical Characteristics
Specifications with standard typeface are for T
J = 25˚C, and those with boldface type apply over full Operating Temperature
Range. Unless otherwise specified, V
IN = 12V, IOUT = 100 mA.
Symbol
Parameter
Conditions
LM2688-ADJ
Units
(Limits)
Typ
(Note 3)
Limit
(Note 4)
SYSTEM PARAMETERS (Note 5)
V
FB
Feedback Voltage
Converter Input = 5V
V
CORE Programmed for 3V
1.230
V
η
Efficiency
Converter Input = 5V, V
CORE = 2.8V, ICORE
= 10A
86
%
DEVICE PARAMETERS
I
b
Feedback Bias Current
V
FB = 1.3V
10
50/100
nA
f
O
Oscillator Frequency
(Note 6)
150
kHz
127/110
kHz(min)
173/173
kHz(max)
V
SAT
Saturation Voltage
I
OUT = 0.5A (Notes 7, 8)
0.9
V
1.1/1.2
V(max)
DC
Max Duty Cycle (ON)
(Note 8)
100
%
Min Duty Cycle (OFF)
(Note 9)
0
%
I
CL
Current Limit
Peak Current, (Notes 7, 8)
0.8
A
0.65/0.58
A(min)
1.3/1.4
A(max)
I
L
Output Leakage Current
(Notes 7, 9, 10) Output = 0V
Output = −1V
50
µA(max)
2mA
15
mA(max)
I
Q
Quiescent Current
(Note 9)
5
mA
10
mA(max)
I
STBY
Standby Quiescent Current
ON/OFF Pin = 5V (OFF) (Note 10)
85
µA
200/250
µA(max)
θ
JA
Thermal Resistance
Junction to Ambient (Note 11)
150
˚C/W
ON/OFF CONTROL
ON/OFF Pin Logic Input
1.3
V
V
IH
Threshold Voltage
Low (Regulator ON)
0.6
V(min)
V
IL
High (Regulator OFF)
2.0
V(max)
I
H
ON/OFF Pin
V
LOGIC = 2.5V (Regulator OFF)
5
µA
Input Current
15
µA(max)
www.national.com
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