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DESCRIPTION
Demonstration circuit 1632A is a single output 1.5V/40A
dual phase synchronous buck converter operating with
a switching frequency of 300kHz over an input voltage
range of 4.5V to 14V. The controlled on-time valley current
mode architecture of the LTC3839 allows for a fast load
step response (see Figure 4). The load step response can
be tested with the on-board load step circuit and a bench
pulse generator.
Other features of the board include remote sensing, sel-
ectable light load operating modes of forced continuous
mode (FCM) and discontinuous mode (DCM), a PLLIN
pin for synchronizing to an external clock, a CLKOUT
pin, an EXTV
pin to reduce losses in the controller, and
CC
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V
OUT
V
Maximum Output Current, I
OUT
Nominal Switching Frequency
Efficiency (see Figures 2 and 3)
Arrow.com.
Downloaded from
(T
= 25°C)
A
CONDITIONS
I
= 0A to 40A, V
OUT
V
= 4.5V to 14V, V
OUT
IN
V
= 1.5V, I
OUT
OUT
DEMO MANUAL DC1632A
Step-Down DC/DC Converter
RUN and TRACK/SS pins. Up to 12-phase operation can
be achieved by daisy-chaining the CLKOUT and PLLIN
signals of multiple boards and programming the relative
phase with the PHASMD jumper.
The demo board uses a high density, two sided drop-in
layout. The entire converter, excluding the bulk output and
input capacitors, fits within a compact 1.6˝ × 1.2˝ area
on the board. The package style for the LTC3839EUH is a
32-lead 5mm × 5mm QFN with an exposed ground pad.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
VALUE
4.5V
14V
= 4.5V to 14V
1.5V ± 2%
IN
= 1.5V
40A
OUT
300kHz
= 40A, V
= 12V
90.7% Typical
IN
LTC3839EUH
Fast Transient
dc1632af
1
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Summary of Contents for Linear Technology LTC3839EUH
- Page 1 (FCM) and discontinuous mode (DCM), a PLLIN http://www.linear.com/demo pin for synchronizing to an external clock, a CLKOUT L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear pin, an EXTV pin to reduce losses in the controller, and Technology Corporation.
- Page 2 QUICK START PROCEDURE Demonstration circuit 1632A is easy to set up to evalu- Load Step Testing (Optional) ate the performance of the LTC3839EUH. Please refer to Demonstration circuit 1632A provides a simple load step Figure 1 for proper measurement equipment setup and circuit consisting of a MOSFET and sense resistor for each follow the procedure below.
- Page 3 DEMO MANUAL DC1632A QUICK START PROCEDURE LTC3839 1.5V/40A Converter FCM, f = 300kHz = 5V = 12V Qtop = Infineon BSC050NE2LS Qbottom = Infineon BSC010NE2LS L = Coiltronics FP1308R3-R44-R (0.44μH, DCR = 0.18m Ω±20%) = 2mΩ SENSE LOAD CURRENT (A) Figure 2.
- Page 4 R4, R5, R17, R19, R26, R27 RES, CHIP 10 1% 0603 VISHAY CRCW060310R0FKEA RS1, RS2 RES, CHIP 0.002 1W 1% 2512 VISHAY WSL25122L000FEA IC LTC3839EUH QFN 5mm × 5mm LINEAR TECH. LTC3839EUH#PBF Additional Circuit Components CIN2 CAP , SVP-F8, OPT CIN5, CIN6, CIN7, CIN8...
- 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.
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