LM3668SD-2833 NSC [National Semiconductor], LM3668SD-2833 Datasheet - Page 3

• Manufacturer Part Number: LM3668SD-2833
• Description: 1A, High Efficiency Dual Mode Single Inductor Buck-Boost DC/DC Converter
• Manufacturer: NSC [National Semiconductor]

1
2
3
4
5
6
7
8
9
10
11
12
DAP
Pin #
Connection Diagrams and Package Mark Information
Pin Descriptions
Ordering Information
Note: As an example, if V
options.
LM3668SD - 2833
LM3668SDX - 2833
LM3668SD - 3034
LM3668SDX - 3034
LM3668SD - 4550
LM3668SDX - 4550
MODE/SYNC
Pin Name
Order Number
PGND
SGND
VOUT
VSEL
SW2
SW1
PV
VDD
DAP
NC*
EN
FB
IN
OUT
option is 3.0V/3.4V, when V
Top View
Connect to output capacitor.
Switching Node connection to the internal PFET switch (P2) and NFET synchronous rectifier (N2).
Power Ground.
Switching Node connection to the internal PFET switch (P1) and NFET synchronous rectifier (N1).
Supply to the power switch, connect to the input capacitor.
Enable Input. Set this digital input high for normal operation. For shutdown, set low.
Signal Supply input. If board layout is not optimum an optional 1µF ceramic capacitor is suggested
as close to this pin as possible.
No connect. Connect this pin to GND on PCB layout.
Analog and Control Ground.
Mode = LOW, Automatic Mode. Mode= HI, Forced PWM Mode SYNC = external clock
synchronization from 1.6MHz to 2.7MHz (When SYNC function is used, device is forced in PWM
mode).
Voltage selection pin; ( ie: 2.8V/3.3V option) Logic input low (or GND) = 2.8V and logic high = 3.3V
(or V
Feedback Analog Input. Connect to the output at the output filter.
Die Attach Pad, connect the DAP to SGND on PCB layout to enhance thermal performance. It should
not be used as a primary ground connection.
IN
) to set output Voltage.
Package
LLP-12
LLP-12
LLP-12
SEL
= Low, set V
20191402
NSC Package
OUT
Marking
S017B
S018B
S019B
to 3V; when V
3
SEL
Description
1000 units, Tape and Reel
4500 units, Tape and Reel
1000 units, Tape and Reel
4500 units, Tape and Reel
1000 units, Tape and Reel
4500 units, Tape and Reel
= high, set V
OUT
Bottom View
= 3.4V. This configuration applies to all voltage
Supplied As
20191403
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