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DC2738A: 3.3V @ 8A, 5V @ 8A, 10V @ 7A, 4.5 ~ 36 Vin, Buck/Boost

Summary

DC2738A is a triple output synchronous step-up/dual step-down supply featuring the LTC7815. The demonstration circuit is designed for two buck circuits VOUT1 5V @ 8A and VOUT2 3.3V @ 8A outputs supplied by a boost circuit VOUT3 10V @ 7A output. (If VIN is higher than 10V then VOUT3 equals to VIN.) Benefiting from this feature, the buck outputs are able to maintain regulation over a wide input voltage range of 4.5V to 36V which is suitable for automotive or other battery fed applications. Also, the demonstration circuit uses a drop-in layout that the main buck circuit components fit in an area of three-quarter inches by 1.5 inches, while the main boost circuit area is three-quarter inches by 1.75 inches.

The main features of the board include rail tracking (buck channels only), an internal 5V linear regulator for bias, separated RUN pins for each output, a PGOOD signal (CH1 only), an over voltage indicator for CH3 and a mode selector that allow the converter to run in CCM, pulse-skipping or Burst Mode® operation. Synchronization to an external clock is also possible. The LT7815 data sheet gives a complete description of these parts, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 2738A.

Specifications

Manufacturer Linear Technology/Analog Devices
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Multi Output
Eval Board Part Number DC2738A-ND
Eval Board Supplier Linear Technology/Analog Devices
Eval Board Normally In Stock
Topology Step Up/Down
Outputs and Type 3 Non-Isolated
Voltage Out M: Highest Current First 5V, 3.3V, 10V
Current Out 8A, 8A, 7A
Voltage In 4.5 ~ 36 V
Efficiency @ Conditions >90%, 12V in, 5V @ 2.8 ~ 8 A
>85%, 5V in, 10V @ 1.5 ~ 7 A
>85%, 12V in, 3.3V @ 2.4 ~ 8 A
Voltage Out Range - Fixed
Features Light Load Mode
Over Voltage Indicator
Power Good Output
Shutdown, Enable, Standby
Synchronizable
Voltage Tracking
Switching Frequency 2.25 MHz
Standby Current [Typical] 38 µA
Quiescent Current [Typical] 3 mA
Component Count + Extras 76 + 107
Internal Switch No
Design Author Linear Technology
Application / Target Market Automotive
Computers
Industrial Power
Servers
Standby Current [Maximum] 56 µA
Quiescent Current [Maximum] - Not Given
Main I.C. Base Part LTC7815
Date Created By Author 2017-12
Date Added To Library 2019-07

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