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DESCRIPTION
Demonstration circuit 1707 is a high efficiency mono-
lithic step-down DC/DC switching regulator designed for
double-data-rate (DDR) memory termination in computer
systems. The VTT output is capable of sourcing and sink-
ing up to 6A with an output voltage equal to one-half the
voltage applied to the V
DDQIN
supply voltage, selected by a jumper. An additional low
current output (VTTR) also equal to one-half the voltage on
V
and can source and sink up to 10mA is included.
DDQIN
Input voltage range is from 2.25V to 5.5V with overvolt-
age protection for transients exceeding 6.5V. Switching
frequency is set to 1MHz although it can be programmed
up to 4MHz and can be synchronized to an external clock
for noise sensitive applications. Jumpers are provided for a
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range (V
)
IN
Output Voltage (VTTR)
Output Voltage (VTT)
Load Regulation
Maximum Output Current
Switching Frequency
Output Voltage Ripple
Efficiency
Efficiency
±6A Monolithic Step-Down Regulator
terminal or one-half the input
(T
= 25°C)
A
CONDITIONS
V
= 3.3V, V
= 1.800V
IN
DDQIN
V
= 3.3V, V
= 1.800V
IN
DDQIN
V
= 3.3V, V
= 1.800V, 0A to 5A Load
IN
DDQIN
V
= 3.3V, V
= 1.800V
IN
DDQIN
V
= 3.3V, 0A to 5A Load
IN
V
= 3.3V, V
= 900mV, 1A Load
IN
OUT
V
= 3.3V, V
= 900mV, 3A Load
IN
OUT
DEMO MANUAL DC1707
for DDR Termination
low quiescent current shutdown and for selecting internal
or external compensation. Internal soft-start is included
and a PGOOD output terminal that pulls low at start-up
and when the VTT output is outside a voltage window. The
LTC3617 is available in the 24-pin 3mm × 5mm thermally
enhanced QFN package.
The LTC3617 datasheet gives a complete description of the
part, operation and application information and should be
read in conjunction with this quick start guide.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
LTC3617EUDD
TYPICAL VALUE
2.25V to 5.5V
900mV ±18mV (±2%)
VTTR ±10mV
2mV
±6A
1MHz ±20%
25mV
P-P
87%
85%
dc1707f
1
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Related Manuals for Linear Technology DC1707
Summary of Contents for Linear Technology DC1707
- Page 1 1MHz although it can be programmed up to 4MHz and can be synchronized to an external clock L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
- Page 2 DEMO MANUAL DC1707 QUICK START PROCEDURE Demonstration circuit 1707 allows the user to quickly 6. To evaluate sourcing current from the VTT terminal, evaluate the performance of the LTC3617. Refer to Figure 1 connect one lead of a 0.2Ω 5W load resistor to the for proper measurement equipment setup and follow the VTT terminal and the other lead to the GND terminal.
- Page 3 DEMO MANUAL DC1707 QUICK START PROCEDURE 5V @ 5A Input Power Supply (set to 3.3V) Connect 0.2Ω to GND (E7) for Sourcing Current Vref 1.800V Connect 0.5Ω to VIN (E1) 0.2/0.5Ω for Sinking Current VTTR Figure 1. Proper Measurement Equipment Setup Figure 2.
- Page 4 DEMO MANUAL DC1707 PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP ., TANT, 47μF , 10V,20%, 7343 AVX, TPSC476M010R0350 C9 (OPT) CAP ., TANT, 100μF , 10V, 20%, 7343 AVX, TPSC107M010R0150 C2, C3, C12, C13 CAP ., X5R, 47μF , 10V, 20% 1206 TAIYO YUDEN, LMK316BJ476ML-T CAP ., X5R, 1μF , 10V, 10% 0402...
- 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 representa- tion 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.
- Page 7 X-ON Electronics Largest Supplier of Electrical and Electronic Components Click to view similar products for category: Power Management IC Development Tools Click to view products by manufacturer: Analog Devices Other Similar products are found below : EVAL-ADM1168LQEBZ EVB-EP5348UI MIC23451-AAAYFL EV MIC5281YMME EV DA9063-EVAL ADP122-3.3-EVALZ ADP130- 0.8-EVALZ ADP130-1.2-EVALZ ADP130-1.5-EVALZ ADP130-1.8-EVALZ ADP1714-3.3-EVALZ ADP1716-2.5-EVALZ ADP1740-1.5- EVALZ ADP1752-1.5-EVALZ ADP1828LC-EVALZ ADP1870-0.3-EVALZ ADP1871-0.6-EVALZ ADP1873-0.6-EVALZ ADP1874-0.3- EVALZ ADP1882-1.0-EVALZ ADP199CB-EVALZ ADP2102-1.25-EVALZ ADP2102-1.875EVALZ ADP2102-1.8-EVALZ ADP2102-2-...
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