DC1245A: Dual 8A, 1.2V and 1.8V, 2.7 ~ 5.5Vin

Summary

The demonstration circuit for the 1245A features the LTM®4616EV, the high efficiency, high density, dual output switch mode power module. The rated load current is 8A for each channel, while derating is necessary for certain VIN, VOUT, and thermal conditions.

By applying a clock signal to the CLKIN pin, the module’s switching frequency may be synchronized from 0.75MHz to 2.25MHz. The same clock frequency is available at the CLKOUT pin with the phase relationship between CLKIN and CLKOUT determined by the PHMODE pin. This feature can be used not only to reduce undesirable frequency harmonics but also to parallel the two channels of LTM4616 or even multiple LTM4616s and LTM4608s to provide higher output currents.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Multi Output
Eval Board Part Number	DC1245A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Topology	Step Down
Outputs and Type	2 Non-Isolated
Voltage Out: Highest Current First	1.2V, 1.8V
Current Out	8A per Channel
Voltage In	2.7 ~ 5.5 V
Efficiency @ Conditions	>77%, 5V in, 1.8V @ 0.75 ~ 8 A >77%, 5V in, 1.2V, 0.7 ~ 8 A >77%, 3.3V in, 1.8V @ 0.5 ~ 8 A >77%, 3.3V in, 1.2V @ 0.5 ~ 8 A
Voltage Out Range	- Fixed
Features	Current Limit (Adj. or Fixed) Current Sharing Internal Inductor Light Load Mode No Custom Transformer Over Current Protection Over Voltage Protection PFM or PWM Power Good Output Short Circuit Protection Shutdown, Enable, Standby Soft Start Synchronizable Thermal Protection Voltage Tracking
Switching Frequency	1.5 MHz
Standby Current [Typical]	1 µA
Quiescent Current [Typical]	75 mA
Component Count + Extras	12 + 54
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	Portable Devices Telecom
Standby Current [Maximum]
Quiescent Current [Maximum]
Main I.C. Base Part	LTM4616
Date Created By Author	2011-06
Date Added To Library	2012-05