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Linear Technology LT3688 Manual

Dual 800ma step-down switching regulator with power-on reset and watchdog timer
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DESCRIPTION
Demonstration circuit 1439A is an adjustable dual mono-
lithic step-down switching regulator with two power-on
reset timers and a watchdog timer. The regulator operates
off inputs up to 36V and withstands transients up to 60V.
The two buck outputs are capable of generating up to
800mA each and both of them have independent RUN/SS
function. The reset and watchdog timeout periods are both
adjustable using external capacitors.
The LT3688 is available in 24-Pin TSSOP and 4mm ×
4mm QFN packages, each with an exposed pad for low
thermal resistance.
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Output Voltage 1
OUT1
V
Output Voltage 2
OUT2
I
Output Current 1
OUT1
I
Output Current 2
OUT2
F
Switching Frequency
SW
t
Watchdog Upper Boundary Period
WDU
t
Watchdog Lower Boundary Period
WDL
t
Programmed Reset Period 1
RST1
t
Programmed Reset Period 2
RST2
DEMO MANUAL DC1439A
LT3688 Dual 800mA Step-Down
Switching Regulator with Power-On
Reset and Watchdog Timer
The LT3688 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demo circuit 1439A.
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.
Specifications are at T
= 25°C.
A
CONDITIONS
V
= 5V, I
= 800mA
OUT1
OUT1
V
= 3.3V, I
= 800mA
OUT2
OUT2
V
= 12V, I
= 800mA
IN
OUT1
V
= 12V, I
= 800mA
IN
OUT2
C7 = 1000pF
C7 = 1000pF
C8 = 1000pF
C9 = 1000pF
MIN
TYP
MAX
UNITS
7
36
4.85
5
5.15
3.20
3.3
3.40
0
800
0
800
0.9
1
1.1
20
1.3
5
5
dc1439af
V
V
V
mA
mA
MHz
ms
ms
ms
ms
1

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Summary of Contents for Linear Technology LT3688

  • Page 1 The reset and watchdog timeout periods are both adjustable using external capacitors. 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.
  • Page 2 Demonstration circuit 1439A is easy to set up to evalu- 5. Check for the proper output voltages: ate the performance of the LT3688. Refer to Figure 1 for VOUT1 = 5V, VOUT2 = 3.3V proper measurement equipment setup and follow the NOTE.

  • Page 3: Quick Start Procedure

    DEMO MANUAL DC1439A QUICK START PROCEDURE – LOAD – – – – POWER SUPPLY DC1439a F01 – – – LOAD Figure 1. DC1439A Proper Equipment Setup = 5V OUT1 = 3.3V OUT2 = 12V = 1MHz (mA) DC1439a F02 Figure 2. Buck Efficiency vs Output Load dc1439af...

  • Page 4: Parts List

    RES, CHIP 49.9k 0.06W 1% 0402 VISHAY CRCW040249K9FKED RES, CHIP 100k 0.06W 1% 0402 VISHAY CRCW0402100KFKED IC, VOLTAGE REGULATOR TSSOP24-FE/AA LINEAR TECHNOLOGY CORPORATION LT3688EFE Additional Demo Board Circuit Components: CAP , ALUM 22µF 63V 25%, OSCON-CE-6.3 SANYO 63CE22BS C12 (OPT)

  • 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 representation 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 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC1439A...

This manual is also suitable for:

1439a