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LM3661 Datasheet(PDF) 3 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) 3 Page - National Semiconductor (TI)

 
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Connection Diagrams
10-Bump micro SMD Package
20098804
Top View
20098805
Bottom View
Ordering Information
Order Number
Output Voltage
Package
NSC Package Marking
Supplied As
LM3661TLX - 1.25
1.05V/1.25V
10Bump Wafer Level
Chip Scale (micro SMD)
SHVB
3000 Units, Tape and Reel
LM3661TL - 1.25
SHVB
250 Units, Tape and Reel
LM3661TLX - 1.35
1.05V/1.35V
SDYB
3000 Units, Tape and Reel
LM3661TL - 1.35
SDYB
250 Units, Tape and Reel
LM3661TLX - 1.40
1.05V/1.40V
SHCB
3000 Units, Tape and Reel
LM3661TL - 1.40
SHCB
250 Units, Tape and Reel
Pin Description
Pin Number
Name
Function
A1
FB
Feedback Analog Input. Connect to the output at the output filter capacitor (see
Typical Application Circuit)
B1
V
SEL
Output Voltage Selection Input. Set this digital input to select the desired output
voltage. Set:
V
SEL = high programmed ouput voltage
V
SEL = low for low programmed output voltage
C1
I
SEL
I
SEL = High (>1.2V) for set current limit to low value
I
SEL = Low (GND) for set current limit to high value
D1
SYNC/MODE
Synchronization Input. Use this digital input for frequency selection or modulation
control. Set:
SYNC/MODE = high for low-noise 600 kHz PWM mode
SYNC/MODE = low for micropower linear mode
SYNC/MODE = a 500 kHz -750 kHz external oscillator for synchronization to an
external clock in PWM mode.
The LM3661 synchronizes with the rising edge of the external clock.
D2
EN
Enable Input. It has an internal pull down resistor of 1 Mohms. Set this digital input
high for normal operation. For shutdown, set low.
D3
PGND
Power Ground
C3
SW
Switching Node connection to the internal PFET switch and NFET synchronous
rectifier. Connect to an inductor with a saturation current rating that exceeds the peak
current limit.
B3
PV
IN
Power Supply Input to the internal PFET switch. Connect to the input filter capacitor
(See Typical Application Circuit).
www.national.com
3


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