Texas Instruments LMR61428 Evaluation Module LMR61428XMMEVM/NOPB LMR61428XMMEVM/NOPB Datenbogen
Produktcode
LMR61428XMMEVM/NOPB
J1
7
Rdd
GND
VO
U
T
Cin
D1
L1
1 Cell Li-ion
Rfbt
Cboot
VIN
U1
BOOT
EN
SW
SGND
FB
LMR61428
FREQ
PGND
VDD
SW
+
2
1
1
8
2
4
1
5
3
VOUT
5V at 0.5A
Co1
+
Rfbb
Cff
Cdd
GND
Co2
EN
Ren
6
Rt
3
30203001
User's Guide
SNVU193A – October 2012 – Revised April 2013
AN-2281 LMR61428 Evaluation Module
1
Introduction
The LMR61428 evaluation module is designed to provide the power supply design engineer with a fully
functional regulator design. The evaluation module takes the input from a single Li-Ion battery and boosts
the voltage up to 5V at a constant load capability of 500mA. The switching frequency of the boost
regulator is set to about 1200 kHz which helps in reducing the solution size and keeping switching noise
out of the AM radio band. The printed circuit board consists of 4 layers of copper on FR4 material. The
first middle layer is a solid ground layer which helps in minimizing the AC current loop. This user's guide
contains the evaluation module schematic, a quick setup procedure using a bench power supply, and a
Bill-of-Materials (BOM). For complete circuit design information, see LMR61428 SIMPLE SWITCHER
14Vout, 2.85A Step-Up Voltage Regulator in VSSOP (
functional regulator design. The evaluation module takes the input from a single Li-Ion battery and boosts
the voltage up to 5V at a constant load capability of 500mA. The switching frequency of the boost
regulator is set to about 1200 kHz which helps in reducing the solution size and keeping switching noise
out of the AM radio band. The printed circuit board consists of 4 layers of copper on FR4 material. The
first middle layer is a solid ground layer which helps in minimizing the AC current loop. This user's guide
contains the evaluation module schematic, a quick setup procedure using a bench power supply, and a
Bill-of-Materials (BOM). For complete circuit design information, see LMR61428 SIMPLE SWITCHER
14Vout, 2.85A Step-Up Voltage Regulator in VSSOP (
2
Features
•
One cell Li-Ion battery for Input Voltage
•
5V Output Voltage at 500mA Output Current
•
Switching Frequency of 1.2 MHz
•
Small Solution Size: 2.287 × 1.058 inches (58.09 × 26.87 mm)
3
Evaluation Board Schematic
Figure 1. LMR61428 Evaluation Module Schematic
All trademarks are the property of their respective owners.
1
SNVU193A – October 2012 – Revised April 2013
AN-2281 LMR61428 Evaluation Module
Copyright © 2012–2013, Texas Instruments Incorporated