Datasheet

FB
2.8V/3.3V
SW1
SW2
EN
LM3668
PV
IN
PGND
SYNC/MODE
VSEL
L = 2.8V
H = 3.3V
VIN = 2.5V - 5.5V
SGND
VOUT
VDD
C2
22 PF
C1
10 PF
2.2 PH
NC
User's Guide
SNVA236F–June 2007–Revised April 2013
AN-1623 LM3668 Evaluation Board
1 Introduction
The LM3668 evaluation board is a working demonstration of a synchronous buck-boost DC-DC converter.
This document contains information about the evaluation board. For more details and electrical
characteristics about the converter operation, see the device-specific data sheet.
2 Operating Range
• V
IN
range: 2.5 V to 5.5 V
• For 2.8 V/3.3 V and 3.0 V/3.4 V versions:
– 1A maximum load current for V
IN
= 2.8 V to 5.5 V
– 800mA maximum load current for V
IN
= 2.7 V
– 600mA maximum load current for V
IN
= 2.5 V
• For 4.5 V/5 V version:
– 1A maximum load current for V
IN
= 3.9 V to 5.5 V
– 800mA maximum load current for V
IN
= 3.4 V to 3.8 V
– 700mA maximum load current for V
IN
= 3.0 V to 3.3 V
– 600mA maximum load current for V
IN
= 2.7 V to 2.9 V
3 Package
WSON–12 no-pullback (3 mm x 3 mm x 0.8 mm)
4 Typical Application
Figure 1. Typical Application Circuit
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1
SNVA236F–June 2007–Revised April 2013 AN-1623 LM3668 Evaluation Board
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