LM2636 National Semiconductor, LM2636 Datasheet - Page 5

• Manufacturer Part Number: LM2636
• Description: 5-Bit Programmable Synchronous Buck Regulator Controller
• Manufacturer: National Semiconductor

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