DC2466A: 3.3 or 5V @ 500mA, 2.7 ~ 38V in

Summary

DC2466A is a buck-boost 500mA charge pump with pin selectable output voltages and includes a watchdog timer featuring the LTC3246EMSE. The LTC3246 operates with a wide input voltage range from 2.7V to 38V and is engineered for diagnostic coverage for ISO 262262 compliant systems. The wide VIN operating range will allow the LTC3246 to provide up to 500mA sufficiently during an automotive cold crank.

The LTC3246 is a switched capacitor buck-boost DC/DC converter with integrated watchdog timer. The device produces a regulated output (3.3V, 5V or adjustable) froma 2.7V to 38V input. Switched capacitor fractional conversion is used to maintain regulation over a wide range of input voltage. Internal circuitry automatically selects the conversion ratio to optimize efficiency as input voltage and load conditions vary. No inductors are required.

The LTC3246’s reset time and watchdog timeout may be set without external components, or adjusted using external capacitors. A windowed watchdog function is used for high reliability applications. The reset input can be used for additional supply monitoring or be configured as a pushbutton reset.

Low operating current (20µA without load, 1.5µA in shutdown) and low external parts count make the LTC3246 ideally suited for low power, space constrained automotive/industrial applications. The LTC3246 data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	DC2466A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Topology	Step Up/Down Switch Cap, Charge Pump
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	3.3 V 5 V
Current Out	500 mA
Voltage In	2.7 ~ 38 V
Efficiency @ Conditions	>70%, 7.9 ~ 9.5V in, 3.3V @ 500 mA >70%, 5.8 ~ 7.5V in, 5V @ 500 mA >70%, 4 ~ 5V in, 3.3V @ 500 mA >70%, 11.5 ~ 14V in, 5V @ 500 mA
Voltage Out Range	2.5 ~ 5 V
Features	Over Voltage Protection Power-On-Reset Timers Short Circuit Protection Shutdown, Enable, Standby Synchronizable Thermal Protection Watchdog Timer
Switching Frequency	450 kHz
Standby Current [Typical]	1.5 µA
Quiescent Current [Typical]	20 µA
Component Count + Extras	5 + 41
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	Automotive Power: Auxiliary Power Supply Power: Industrial Power Telecom
Standby Current [Maximum]	3 µA
Quiescent Current [Maximum]	30 µA
Main I.C. Base Part	LTC3246
Date Created By Author	2017-04
Date Added To Library	2019-02