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DESCRIPTION
Demonstration circuit 1669A features the LTM
μModule
®
regulator, a high performance high effi ciency
step-down regulator. The LTM4627EV has an operating
input voltage range of 4.5V to 20V and is able to provide
an output current of up to 15A. The output voltage is pro-
grammable from 0.6V to 5V and can be remotely sensed
with the internal optional differential remote sensing
amplifi er. The LTM4627EV is a complete DC/DC point-of-
load regulator in a thermally enhanced 15mm × 15mm ×
4.32mm LGA package requiring only a few input and output
capacitors. This regulator is internally compensated and
employs constant frequency current mode architecture,
enabling a fast transient response and stable control
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage, V
OUT
Maximum Continuous Output Current
Default Operating Frequency
External Clock Synchronous Frequency Range
Effi ciency
BOARD PHOTO
DEMO MANUAL DC1669A
15A Step-Down µModule
4627EV
loop over a wide range of output capacitance. It supports
®
frequency synchronization and Burst Mode
increased light-load effi ciency. Output voltage tracking
is also available through the TRACK/SS pin for supply
rail sequencing. The LTM4627 data sheet must be read
in conjunction with this demo manual for working on or
modifying demo circuit 1669.
Design fi les for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, μModule, Burst Mode, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
CONDITIONS / NOTES
Jumper Selectable
Derating is Necessary for Certain Operating
Conditions. See Data Sheet for Details
V
= 12V, V
= 1.8V, I
= 15A
IN
OUT
OUT
LTM4627EV:
Regulator
®
VALUE
4.5V to 20V
1.0V
, 1.2V
, 1.5V
, 2.5V
, 1.8V
DC
DC
DC
DC
15A DC
500kHz
250kHz to 770kHz
86.6%, See Figure 2
operation for
, 3.3V
DC
DC
dc1669af
1
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Table of Contents
Related Manuals for Linear Technology DC1669A
Summary of Contents for Linear Technology DC1669A
- Page 1 4.32mm LGA package requiring only a few input and output L, LT, LTC, LTM, μModule, Burst Mode, Linear Technology and the Linear logo are registered capacitors. This regulator is internally compensated and trademarks of Linear Technology Corporation. All other trademarks are the property of their employs constant frequency current mode architecture, respective owners.
- Page 2 0Ω 8.25k (1%) the load regulation, effi ciency and other parameters. Output voltage ripple should be measured at J4 with a BNC cable and oscilloscope. – – LOAD 0A TO – – – Figure 1. Test Setup of DC1669A dc1669af...
- Page 3 DEMO MANUAL DC1669A QUICK START PROCEDURE = 500kHz = 500kHz 3.3V 3.3V 2.5V 2.5V 1.8V 1.8V 1.5V 1.5V 1.2V 1.2V LOAD CURRENT (A) LOAD CURRENT (A) DC1669 F02b DC1669 F02a Figure 2. Measured Supply Effi ciency at 12V and 18V...
- Page 4 DEMO MANUAL DC1669A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP , 1210 22μF 10% 25V X5R MURATA GRM32ER61E226KE15L CAP , 0603 150pF 10% 25V NPO AVX 06033A151KAT2A C11, C12 CAP , 1210 100μF 20% 6.3V X5R TAIYOYUDEN JMK325BJ107MM-T CAP , 7343 330uF 20% 6.3V POSCAP...
- Page 5 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
- Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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