LM2705MFX-ADJ National Semiconductor, LM2705MFX-ADJ Datasheet - Page 3

• Manufacturer Part Number: LM2705MFX-ADJ
• Description: Micropower Step-up DC/DC Converter with 150mA Peak Current Limit
• Manufacturer: National Semiconductor

I
V
I
I
V
R
T
I
I
UVP
V
Hysteresis
SHDN
Threshold
θ
Q
CL
B
SD
L
JA
OFF
FB
IN
FB
DSON
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Electrical Characteristics
Specifications in standard type face are for T
Range (T
Note 1: Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to
be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The maximum allowable power dissipation is a function of the maximum junction temperature, T
and the ambient temperature, T
temperature is calculated using: P
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin.
Note 4: ESD susceptibility using the machine model is 150V for SW pin.
Note 5: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100%
production tested or guaranteed through statistical analysis. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality
Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
Note 6: Typical numbers are at 25˚C and represent the most likely norm.
Note 7: Feedback current flows into the pin.
Symbol
V
SW Voltage
FB Voltage
SHDN Voltage
Maximum Junction Temp. T
(Note 2)
Lead Temperature
(Soldering 10 sec.)
Vapor Phase
(60 sec.)
IN
J
= −40˚C to +125˚C). Unless otherwise specified V
Device Disabled
Device Enabled
Shutdown
FeedbackTrip Point
Switch Current Limit
FB Pin Bias Current
Input Voltage Range
Switch R
Switch Off Time
SHDN Pin Current
Switch Leakage Current
Input Undervoltage Lockout
Feedback Hysteresis
SHDN low
SHDN High
Thermal Resistance
DSON
Parameter
A
. See the Electrical Characteristics table for the thermal resistance. The maximum allowable power dissipation at any ambient
D
(MAX) = (T
J
J(MAX)
− T
FB = 1.3V
FB = 1.2V
SHDN = 0V
FB = 1.23V (Note 7)
SHDN = V
SHDN = V
SHDN = GND
V
ON/OFF Threshold
SW
J
A
)/θ
= 25˚C and those in boldface type apply over the full Operating Temperature
= 20V
(Note 1)
JA
. Exceeding the maximum allowable power dissipation will cause excessive die temperature.
Conditions
150˚C
300˚C
215˚C
7.5V
7.5V
IN
IN
21V
, T
, T
2V
J
J
= 25˚C
= 125˚C
IN
3
=2.2V.
Operating Conditions
Infrared
(15 sec.)
ESD Ratings (Note 3)
Junction Temperature
(Note 5)
Supply Voltage
SW Voltage Max.
Human Body Model
Machine Model (Note 4)
(Note 5)
1.189
Min
110
100
2.2
1.1
J
(MAX), the junction-to-ambient thermal resistance, θ
(Note 6)
1.237
0.01
0.05
Typ
235
150
400
220
0.7
1.8
0.7
0.7
40
30
15
0
0
8
(Note 5)
1.269
Max
300
175
180
120
2.5
7.0
1.6
0.3
70
80
5
−40˚C to +125˚C
2.2V to 7V
www.national.com
220˚C
20.5V
Units
˚C/W
200V
mA
mV
µA
nA
nA
µA
ns
Ω
2kV
V
V
V
V
JA
,