Texas Instruments LM3691TL-1.2 Evaluation Board LM3691TL-1.2EV/NOPB LM3691TL-1.2EV/NOPB Scheda Tecnica
Codici prodotto
LM3691TL-1.2EV/NOPB
A2
A1
B2
C2
SW
EN
V
OUT
C
IN
4.7
P
F
V
IN
2.3V to 5.5V
C1
FB
V
IN
B1
GND
MODE
C
OUT
4.7
P
F
LM3691
L = 1
P
H
User's Guide
SNVA312B – May 2008 – Revised April 2013
AN-1772 LM3691 Evaluation Board
1
Introduction
The LM3691 evaluation board is a working demonstration of a step down DC-DC converter. For further
information on buck converter topology, device electrical characteristics, and component selection please
refer to the High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications
(
information on buck converter topology, device electrical characteristics, and component selection please
refer to the High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications
(
) data sheet.
2
General Description
The LM3691 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single
Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1A load current, over an input voltage range
from 2.3V to 5.5V. There are several different fixed voltage output options available.
Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1A load current, over an input voltage range
from 2.3V to 5.5V. There are several different fixed voltage output options available.
LM3691 has a mode-control pin that allows the user to select Forced PWM mode or Auto mode that
changes modes between ECO mode and PWM mode automatically depending on the load. In ECO,
LM3691 offers superior efficiency and very low I
changes modes between ECO mode and PWM mode automatically depending on the load. In ECO,
LM3691 offers superior efficiency and very low I
q
under light load conditions.
The LM3691 is available in a 6-bump DSBGA package. Only three external surface-mount components, a
1
1
μ
H inductor, a 4.7
μ
F input capacitor and a 4.7
μ
F output capacitor, are required.
3
Operating Conditions
Input Voltage Range
2.3V to 5.5V
Recommended Load Current
0 mA to 1000 mA
Junction Temperature (T
J
) Range
−
30°C to +125°C
Ambient Temperature (T
A
) Range
−
30°C to +85°C
4
Typical Application
Figure 1. Typical Application Circuit
1
SNVA312B – May 2008 – Revised April 2013
AN-1772 LM3691 Evaluation Board
Copyright © 2008–2013, Texas Instruments Incorporated