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LM3661 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM3661
Description  450mA Subminiature, Micropower Step-Down DC-DC Converter for Ultra Low-Voltage Circuits
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM3661 Datasheet(HTML) 5 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.
Supply Voltage
PVIN, VDD to SGND
−0.2V to +6V
PGND to SGND
−0.2V to +0.2V
EN, SYNC/MODE, VSEL to
SGND
−0.2V to +6V
FB, ISEL, SW
−0.2V to (VDD
+0.2V)
Storage Temperature Range
−45˚C to 150˚C
Lead Temperature
(Soldering, 10 sec.)
260˚C
Operating Ratings
Input Voltage Range
2.7V to 5.5V
Operating Temperature
-30˚C to 85˚C
Junction Temperature (Note 3)
−30˚C to +125˚C
Minimum ESD Rating
(Human Body Model, C = 100 pF,
R = 1.5 k
Ω)
±2kV
Thermal properties
Thermal Resistance (
θ
JA)
170˚C/W
Electrical Characteristics (Note 2)
Specifications with standard typeface are for T
J = 25˚C, and those in bold face type apply over the full Operating Temperature
Range (T
A =TJ = −30˚C to +85˚C). Unless otherwise specified, PVIN =VDD = EN = SYNC/MODE = VSEL = 3.6V, ISEL= 0V,
C
OUT = 22 µF.
Symbol
Parameter
Remarks
Min
Typ
Max
Units
V
FB, PWM
Feedback Voltage, PWM Mode
V
IN = 2.7V to 5.5V
LM3661TL-1.25, V
SEL =0
1.019
1.05
1.082
V
LM3661TL-1.25, V
SEL=VIN
1.213
1.25
1.288
V
LM3661TL-1.35, V
SEL =0
1.019
1.05
1.082
V
LM3661TL-1.35, V
SEL =VIN
1.310
1.35
1.391
V
LM3661TL-1.40, V
SEL =0
1.019
1.05
1.082
V
LM3661TL-1.40, V
SEL =VIN
1.358
1.40
1.442
V
V
FB, LINEAR
Feedback Voltage, Linear Mode
V
IN= 2.7V to 5.5V, IOUT = 1mA
LM3661TL-1.25, V
SEL =0
0.998
1.05
1.103
V
LM3661TL-1.25, V
SEL=VIN
1.188
1.25
1.313
V
LM3661TL-1.35, V
SEL =0
0.998
1.05
1.103
V
LM3661TL-1.35, V
SEL =VIN
1.283
1.35
1.418
V
LM3661TL-1.4, V
SEL=0
0.998
1.05
1.103
V
LM3661TL-1.4, V
SEL=VIN
1.33
1.4
1.47
V
V
OVP
OVP Comparator Hysteresis
Voltage (Note 5)
SYNC/MODE = V
IN
V
IN = 2.7V to 5.5V
64
90
mV
OVP Trip point
SYNC/MODE = V
IN
V
IN = 3.6V
50
70
90
mV
I
SHDN
Shutdown Supply Current
EN = 0V
0.5
5
µA
I
Q,PWM
DC Bias Current into V
DD
(V
OUT set to 1.35V)
PWM mode, no switching
(SYNC/MODE = V
DD,VFB=2V)
425
µA
I
Q,LIN
DC Bias Current into V
DD
No-Load, Linear mode
(SYNC/MODE = 0V)
29
40
µA
R
DSON(P)
Pin-pin Resistance for PFET
250
m
R
DSON(N)
Pin-pin Resistance for NFET
180
m
I
lim_-1.25
Switch Peak Current Limit
PWM mode
I
SEL=VIN,VIN = 2.7V to 4.5V
TBD
454
TBD
mA
PWM mode
I
SEL =0,VIN = 2.7V to 4.5V
TBD
TBD
TBD
mA
I
lim_-1.35/-1.4
Switch Peak Current Limit
PWM mode
I
SEL=VIN,VIN = 2.7V to 4.5V
473
518
550
mA
PWM mode
I
SEL =0,VIN = 2.7V to 4.5V
565
615
650
mA
I
lim_LIN
Max Current in Linear Mode
SYNC/MODE = 0V, FB = 0V
V
IN = 2.7V to 5.5V
35
60
90
mA
www.national.com
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