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Description
Demonstration circuit 2249B features the
µModule
regulator, a tiny low profile high performance
®
high efficiency dual step-down regulator. The LTM4622
has an operating input voltage range of 3.6V to 20V and
is able to provide an output current of up to 2.5A for each
channel. Each output's voltage is programmable from 0.6V
to 5.5V. The LTM4622 is a complete DC-DC point of load
regulator in a low profile thermally enhanced 6.25mm ×
6.25mm × 1.82mm LGA package requiring only a few input
and output capacitors. Output voltage tracking is available
through the TRACK/SS pin for supply rail sequencing.
performance summary
PARAMETER
Input Voltage Range
Output Voltage V
, V
OUT1
OUT2
Maximum Continuous Output Current Each
Phase
Default Operating Frequency
Efficiency
BoarD photo
Ultrathin Dual 2.5A Step-Down
LTM
4622EV
External clock synchronization is available through the
®
SYNC/MODE pin. For high efficiency at low load currents
the MODE pin jumper (JP3) selects the Burst Mode
tion for operation in less noise sensitive applications. The
LTM4622 data sheet must be read in conjunction with this
demo manual for working on or modifying demo circuit
2249B.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2249B
L, LT, LTC, LTM, Linear Technology, µModule, Burst Mode and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Specifications are at T
CONDITIONS
Programmable with FB Pin Resistors
Derating is Necessary for Certain Operating Conditions. See
Data Sheet for Details
V
= 12V, V
= 3.3V, I
= 2.5A, f
IN
OUT1
OUT
V
= 12V, V
= 1.2V, I
= 2.5A, f
IN
OUT2
OUT
DEMO MANUAL DC2249B
µModule Regulator
= 25°C
A
VALUE
4V to 20V
3.3V
2.5A
1MHz
= 2MHz
87.5%. See Figure 2
SW
= 1MHz
76.7%. See Figure 2
SW
LTM4622EV
®
, 1.2V
DC
DC
DC
dc2249bf
op-
1
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Related Manuals for Linear Technology DC2249B
Summary of Contents for Linear Technology DC2249B
- Page 1 Output voltage tracking is available L, LT, LTC, LTM, Linear Technology, µModule, Burst Mode and the Linear logo are registered through the TRACK/SS pin for supply rail sequencing. trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
-
Page 2: Quick Start Procedure
DEMO MANUAL DC2249B Quick start proceDure Demonstration circuit 2249B is an easy way to evaluate 5. Once the proper output voltages are established, ad- the performance of the LTM4622. Please refer to Figure 1 just the load current on each rail within the 0A to 2.5A for test setup connections and follow the procedure below. - Page 3 DEMO MANUAL DC2249B Quick start proceDure 0A TO 2.5A 0A TO 2.5A – – – – – – DC2249b F01 – – – Figure 1. Test Setup dc2249bf...
- Page 4 DEMO MANUAL DC2249B Quick start proceDure = 3.3V = 3.3V (2MHz) (2MHz) = 1.2V = 1.2V (1MHz) (1MHz) LOAD CURRENT (A) LOAD CURRENT (A) DC2249b F02 Figure 2. Measured Supply Efficiency at 12V and 5V dc2249bf...
- Page 5 DEMO MANUAL DC2249B Quick start proceDure : 50mV/DIV 1A DC 1 × 22µF + 1 × 47µF 1 × 22µF + 1 × 47µF Figure 3. Measured Load Transient Response (1A to 2A Load Step) Figure 4. Measured Load Transient Response (1A to 2A Load Step)
-
Page 6: Parts List
DEMO MANUAL DC2249B parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP , X5R, 2.2µF, 10V, 10%, 0603 MURATA, GRM188R61A225KE34D C3, C13 CAP , X5R, 22µF, 25V, 20%, 0805 MURATA, GRM21BR61E226ME-44L C16, C29 CAP , X5R, 22µF, 6.3V, 20%, 0805... -
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.
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