DC1523A: 12V @ 5A, 5 ~ 36V in, Buck/Boost

Summary

Demonstration circuit 1523A features the LTC®3789EGN, a high efficiency switching step-up/down controller. The DC1523A input range is from 5V to 36V. The output voltage is 12V. The board is capable of delivering up to 5A of output current over the input voltage range.

The LTC3789EGN is a high performance switching regulator controller designed to regulate the output using input voltages above, below or equal to the output voltage. Synchronous operation provides very high efficiency, up to 97%. Constant frequency current mode architecture allows phase-lockable frequency from 200kHz to 600kHz. An accurate output current limit provides support for battery charging. A wide input and output range with smooth transfer function through all operating modes makes the product ideal for automotive, telecom and battery systems.

The MODE/PLLIN pin can select between pulse skipping mode and forced continuous mode operation and allows the IC to be synchronized to an external clock. A Power Good output pin indicates when the output is within 7.5% of its set point.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	505-DC1523A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Topology	Step Up/Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	12 V
Current Out	5 A
Voltage In	5 ~ 36 V
Efficiency @ Conditions	>96%, 9V in, 12V @ 0.8 ~ 5 A >96%, 24V in, 12V @ 2.5 ~ 5 A >96%, 18V in, 12V @ 1.3 ~ 5 A >96%, 12V in, 12V @ 1.8 ~ 5 A >94%, 6V in, 12V @ 0.6 ~ 3.2 A >94%, 36V in, 12V @ 2.4 ~ 5 A >94%, 30V in, 12V @ 1.6 ~ 5 A
Voltage Out Range	0.8 ~ 38 V
Features	Current Limit (Adj. or Fixed) LDO Regulator(s), On-Chip Power Good Output Shutdown, Enable, Standby Soft Start Under Voltage Protection, Brown-Out
Switching Frequency	400 kHz
Standby Current [Typical]	40 µA
Quiescent Current [Typical]	3 mA
Component Count + Extras	60 + 20
Internal Switch	No
Design Author	Linear Technology
Application / Target Market	Automotive Power: Auxiliary Power Supply Power: Industrial Power
Standby Current [Maximum]	60 µA
Quiescent Current [Maximum]	- Not Given
Main I.C. Base Part	LTC3789
Date Created By Author	2010-11
Date Added To Library	2015-08