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	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Multi Output
Eval Board Part Number	DC2738A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Topology	Step Up/Down
Outputs and Type	3 Non-Isolated
Voltage Out: 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 Power: 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