LM3668_15 Datasheet, PDF (3/30 Pages) Texas Instruments – 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter

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5 Device Comparison Table
ORDER NUMBER
LM3668SD-2833/NOPB
LM3668SDX-2833/NOPB
LM3668SD-3034/NOPB
LM3668SDX-3034/NOPB
LM3668SD-4550/NOPB
LM3668SDX-4550/NOPB
OUTPUT VOLTAGE
(V)
2.8, V_SEL = low
3.3, V_SEL = high
3, V_SEL = low
3.4, V_SEL = high
4.5, V_SEL = low
5, V_SEL = high
PACKAGE
DQB (WSON)
6 Pin Configuration and Functions
DQB Package
12-Pin WSON
Top View
VOUT
1
SW2
2
PGND
3
SW1
4
PVIN
5
EN
6
DAP
12 FB
11 ^VSEL
10
MODE/
SYNC
9
SGND
8
NC
7
VDD
LM3668
SNVS449O – JUNE 2007 – REVISED APRIL 2015
PACKAGE MARKING
S017B
S018B
S019B
SUPPLIED AS
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
DQB Package
12-Pin WSON
Bottom View
FB ₁₂
VSEL ₁₁
MODE/
SYNC
10
SGND
9
NC
8
VDD
7
DAP
1
VOUT
2
SW2
3
PGND
4
SW1
5
PVIN
6
EN
PIN
NO.
NAME
1
VOUT
2
SW2
3
PGND
4
SW1
5
PVIN
6
EN
7
VDD
8
NC
9
SGND
10
MODE/SYNC
11
12
DAP
VSEL
FB
DAP
TYPE
A
A
G
A
P
I
P
-
G
I
I
A
-
Pin Functions⁽¹⁾
DESCRIPTION
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 1-µF ceramic capacitor
is suggested as close to this pin as possible.
No connect. Connect this pin to SGND on PCB layout.
Analog and Control Ground.
Mode = LOW, Automatic Mode. Mode= HI, forced PWM Mode. SYNC = external clock
synchronization from 1.6 MHz to 2.7 MHz.(When SYNC function is used, device is
forced in PWM mode).
Voltage selection pin; (for example, 2.8-V-3.3-V option) logic input low (or GND) = 2.8
V and logic high = 3.3 V (or V_IN) to set output voltage.
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.
(1) A: Analog Pin, G: Ground Pin, P: Power Pin, I: Digital Input Pin
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