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Linear Technology LT3692A Demo Manual

Monolithic dual tracking 3.5a step-down switching regulator
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DESCRIPTION
Demonstration circuit 1403A is a dual current mode PWM
step-down DC/DC converter featuring the LT3692A. The
demo circuit is designed for 5V and 3.3V outputs from a
7V to 36V input. The current capability of each channel is
up to 3A. Individual soft-start, current limit, comparator,
input voltage for each output as well as frequency division
and synchronous and clock output functions simplify the
complex design of dual-output power converters.
Both converters are synchronized to either a common
external clock input or a resistor-programmable 250kHz
to 2.25MHz internal oscillator. At all frequencies, a 180°
phase shift between channels is maintained, reducing
EFFICIENCY GRAPH
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V
OUT1
Output Voltage V
OUT2
Switching Frequency
Maximum Output Current I
Maximum Output Current I
Voltage Ripple V
OUT1
Voltage Ripple V
OUT2
Arrow.com.
Downloaded from
100
95
90
85
80
75
70
65
60
0.3
Figure 1. Efficiency vs Load Current
CONDITION
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
OUT1
IN
V
= 7V ~ 36V
OUT2
IN
V
= 12V, I
IN
OUT1
V
= 12V, I
IN
OUT2
DEMO MANUAL DC1403A
Monolithic Dual Tracking 3.5A
Step-Down Switching Regulator
voltage ripple. Programmable frequency allows optimi-
zation between efficiency and external component size.
Each output can be independently disabled using its
own SHDN pin and be placed in a low quiescent current
shutdown mode.
The LT3692A data sheet gives complete description of the
device, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demo circuit 1403A.
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.
V
= 12V
IN
f = 400kHz
V
= 5V
OUT1
V
= 3.3V
OUT2
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3.0
LOAD CURRENT (A)
dc1403a F01
Specifications are at T
= 25°C
A
= 3A
= 3A
LT3692A
VALUE
7V
36V
5V ±3%
3.3V ±3%
400kHz ±10%
3A
3A
< 20mV
< 20mV
dc1403af
1

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Summary of Contents for Linear Technology LT3692A

  • Page 1 250kHz to 2.25MHz internal oscillator. At all frequencies, a 180° L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of phase shift between channels is maintained, reducing Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    Demo circuit 1403A is easy to set up to evaluate the per- 3. Turn on the power at the input. formance of the LT3692A. Refer to Figure 2 for proper NOTE. Ensure that the input voltage does not exceed 36V.

  • Page 3: Additional Notes

    DEMO MANUAL DC1403A QUICK START PROCEDURE dc1403a F03 Figure 3. Measuring Input or Output Ripple ADDITIONAL NOTES If an EMI filter is desired on V , it can be feasibly in- stalled on the back of the board in the optional circuit area. However, a trace cut is required for the insertion of the optional circuit.

  • Page 4: Parts List

    DEMO MANUAL DC1403A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C2, C3 CAP , 1210 4.7μF 10% 50V X7R MURATA GRM32ER71H475KA88L C4, C5 CAP , 0603 0.47μF 10% 25V X7R MURATA GRM188R71E474KA12D C7, C8 CAP , 1210 100μF 20% 10V X5R TAIYO YUDEN LMK325ABJ107MM-T C10, C11 CAP , 0402 22pF 10% 25V NPO...

  • Page 5: 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 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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