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Linear Technology DC2005A Manual
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Linear Technology DC2005A Manual

High efficiency synchronous step-down regulator with ultralow quiescent current
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DESCRIPTION
Demonstration circuit DC2005A is a synchronous step-
down regulator using an
regulator. The DC2005A operates from an input voltage
range of 2.7V to 17V and provides an adjustable output
voltage range from 1.2V to 5V (V
current. A user-selectable mode input is provided to allow
the user to trade off ripple noise for light load efficiency.
Burst Mode
operation provides the highest efficiency at
®
light load, while pulse-skipping mode provides the lowest
voltage ripple. The MODE pin can also be used to sync the
switching frequency to an external clock.
The switching frequency is fixed at 1MHz or 2.25MHz
with a ±40% synchronizing range. The regulator features
ultralow quiescent current and high efficiency over a wide
V
range.
OUT
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Onboard User Selectable Output Voltages
Default Mode Setting
Default Switching Frequency
Default Output Voltage, V
OUT
Maximum Continuous Output Current, I
Output Voltage Ripples (Peak-to-Peak)
Load Transient Response
Thermal Image
Efficiency
High Efficiency Synchronous Step-Down
Regulator with Ultralow Quiescent Current
LTC
3624
monolithic buck
®
< V
) at 2A of output
OUT
IN
Specifications are at T
CONDITIONS
V
= 2.7V to 17V, I
IN
JP2
V
= 12V, V
IN
OUT
OUT
V
= 12V, V
IN
OUT
V
= 12V, V
IN
OUT
V
= 12V, V
IN
OUT
V
= 12V, V
IN
OUT
DEMO MANUAL DC2005A
The DC2005A uses very low profile surface mount com-
ponents and all ceramic output capacitors. The compact
8-lead DFN (3mm × 3mm) package makes the LTC3624 an
excellent choice for battery-powered equipment, general
purpose step-down power supply, and emergency radio
applications.
It is recommended to read the data sheet and demo manual
of the LTC3624 prior using or making any changes to
DC2005A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
= 25°C
A
= 2A (V
≤ V
)
OUT
OUT
IN
= 5V, I
= 0A to 2A
OUT
= 5V, I
= 2A
OUT
= 5V, I
= 1A to 2A
OUT
= 5V, I
= 2A, 1MHz
OUT
= 5V, I
= 2A, BM, 1MHz
OUT
LTC3624EDD
VALUE
2.7V to 17V
1.2V, 1.8V, 2.5V, 3.3V and 5V
Burst Mode Operation (BM)
1MHz
5V ±2%
2A
9.4mV (See Figure 5)
See Figure 6
See Figure 7
90.4% (See Figure 3 )
dc2005af
1

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Summary of Contents for Linear Technology DC2005A

  • Page 1 The switching frequency is fixed at 1MHz or 2.25MHz L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks with a ±40% synchronizing range. The regulator features of Linear Technology Corporation. All other trademarks are the property of their respective owners.
  • Page 2 DEMO MANUAL DC2005A QUICK START PROCEDURE Demonstration circuit DC2005A is easy to set up to evaluate 7. To select other output voltages, use the on board user the performance of the LTC3624. Please refer to Figure1 selectable output voltage jumpers. Shutting down...

  • Page 3: Quick Start Procedure

    DEMO MANUAL DC2005A QUICK START PROCEDURE Figure 1. Proper Equipment Measurement Setup Figure 2. Scope Probe Placements for Measuring Input or Output Ripple dc2005af...
  • Page 4 DEMO MANUAL DC2005A QUICK START PROCEDURE = 12V = 0A TO 2A = 1MHz 1.2V 1.2V 1.8V 1.8V 2.5V = 12V 2.5V 3.3V = 0A TO 2A 3.3V 5.0V = 1MHz 5.0V 0.01 LOAD CURRENT (A) LOAD CURRENT (A) Figure 3. Measured Efficiency in Burst Mode Operation (BM) Figure 4.
  • Page 5 DEMO MANUAL DC2005A QUICK START PROCEDURE NO FORCED AIRFLOW = 24°C = 12V = 5V = 2A = 1MHz Figure 7. Thermal Performance dc2005af...

  • Page 6: Parts List

    DEMO MANUAL DC2005A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP, 0402 15pF 5% 50V NPO AVX 04025A150JAT2A CAP, 47µF 20% 20V 33mΩ PANASONIC OSCON 20SVPA47M C2,C3 CAP, 1206 22µF10% 25V X5R MURATA GRM31CR61E226KE15L CAP, 1206 47µF 20% 6.3V X5R TAIYO YUDEN JMK316BJ476ML-T CAP, 0603 2.2µF 10% 10V X5R...

  • Page 7: Schematic Diagram

    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 8 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 9 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC2005A...

This manual is also suitable for:

Ltc3624edd