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LM2636 Folha de dados(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM2636
Descrição Electrónicos  5-Bit Programmable Synchronous Buck Regulator Controller
Download  14 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2636 Folha de dados(HTML) 5 Page - National Semiconductor (TI)

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Electrical Characteristics (Continued)
V
CC = 5V unless otherwise indicated under the Conditions column. Typicals and limits appearing in plain type apply for TA =
T
J = +25˚C. Limits appearing in boldface type apply over 0˚C to +70˚C.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
OUTEN_IH
OUTEN Pin Input Logic
Low to Logic High Trip
Point
OUTEN Voltage
3.5
3.0
V
V
OUTEN_IL
OUTEN Pin Input Logic
High to Logic Low Trip
Point
OUTEN Voltage
1.8
1.5
V
V
REF
Band Gap Reference
I
VREF =0mA
1.225
1.256
1.287
V
V
REF_LOAD
Reference Voltage at
Full Load
I
VREF = 0.5 mA, Sourcing
1.223
1.254
1.285
V
V
REF_525
Reference Voltage at
High Line
I
VREF = 0 mA, VCC = 5.25V
1.226
1.257
1.288
V
V
REF_475
Reference Voltage at
Low Line
I
VREF = 0 mA, VCC = 4.75V
1.224
1.255
1.286
V
∆V
REF_LOAD
Reference Voltage
Load Regulation
I
VREF = 0.5 mA, Sourcing
−2
mV
∆V
REF_LINE
Reference Voltage Line
Regulation
I
VREF = 0 mA, VCC Changes from
5.25V to 4.75V
−0.5
mV
V
SAWL
Ramp Signal Valley
Voltage
1.25
V
V
SAWH
Ramp Signal Peak
Voltage
3.25
V
V
PWRBAD_GD
PWRGD Pin
Trip
Points (see Pin
Description for Pin 13)
% above DAC Output Voltage, when
Output Voltage
10
%
% below DAC Output Voltage, when
Output Voltage
−10
V
PWRGD_BAD
PWRGD Pin
Trip
Points (see Pin
Description for Pin 13)
% above DAC Output Voltage, when
Output Voltage
8
%
% below DAC Output Voltage, when
Output Voltage
−8
V
OVP
Over-voltage Protection
Trip Point
% above DAC Output Voltage
15
%
t
PWRGD
Power Good Response
Time
V
SENSE Rises from 0V to Rated
V
OUT
2
6
15
µs
t
PWRBAD
Power Not Good
Response Time
V
SENSE Falls from Rated VOUT to 0V
2
6
15
µs
I
OUTEN
OUTEN Pin Internal
Pull-Up Current
60
90
130
µA
V
VID_IH
VID Pins Logic High
Trip Point
3.5
3.0
V
V
VID_IL
VID Pins Logic Low
Trip Point
1.8
1.3
V
I
VID
VID0:4 Internal Pull-Up
Current
60
90
130
µA
t
SS
Soft Start Duration
2048
clock
cycles
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Recommended Operating Conditions are conditions under which
the device operates correctly. Recommended Operating Conditions do not imply guaranteed performance limits.
Note 2: Maximum allowable DC power dissipation is a function of the maximum junction temperature, TJMAX , the junction-to-ambient thermal resistance, θJA, and
the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
The junction-to-ambient thermal resistance,
θJA, for LM2636 in the M20B package is 88˚C/W, and 120˚C/W for the MTC20 package.
www.national.com
5


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