LM2635MX National Semiconductor, LM2635MX Datasheet - Page 5

• Manufacturer Part Number: LM2635MX
• Description: IC REG SYNCH BUCK 5-BIT 20-SOIC
• Manufacturer: National Semiconductor

Specifications of LM2635MX

• Applications: Power Supplies
• Current - Supply: 2.5mA
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM2635MX; LM2635MXTR

V
V
V
V
∆V
∆V
V
V
V
V
V
t
t
I
V
V
I
t
PWRGD
PWRBAD
OUTEN
VID
SS
Electrical Characteristics
REF
REF_LOAD
REF_525
REF_475
SAWL
SAWH
PWRBAD_GD
PWRGD_BAD
OVP
VID_IH
VID_IL
V
T
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, θ
Note 3: All pins are rated for 2 kV, except for the I
Symbol
REF_LOAD
REF_LINE
J
CC
= +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
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 ↓ Trip
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
JA
, for LM2635 in the M20B package is 88˚C/W.
MAX
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
VREF
VREF
VREF
VREF
VREF
VREF
SENSE
SENSE
pin (Pin 7) which is rated for 1.5 kV.
(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 V
Falls from Rated V
Conditions
↑
↑
CC
CC
CC
= 5.25V
= 4.75V
Changes from
5
OUT
to 0V
OUT
JMAX
1.231
1.229
1.232
1.230
, the junction-to-ambient thermal resistance, θ
Min
3.5
60
60
2
2
1.256
1.254
1.257
1.258
2048
−0.5
1.25
3.25
Typ
−10
3.0
1.8
−2
−8
10
15
90
90
8
6
6
1.281
1.279
1.282
1.280
Max
130
130
1.3
15
15
www.national.com
cycles
JA
Units
clock
A
mV
mV
, and
µA
µA
µs
µs
%
%
%
V
V
V
V
V
V
V
V
=