The ADP1828 is a versatile and synchronous PWM voltage mode buck controller. It drives an all N-channel power stage to regulate an output voltage as low as 0.6 V to 85% of the input voltage and is sized to handle large MOSFETs for point-of-load regulators. The ADP1828 is ideal for a wide range of high power applications, such as DSP and processor core I/O power, and general-purpose power in telecommunications, medical imaging, PC, gaming, and industrial applications. It operates from input bias voltages of 3 V to 18 V with an internal LDO that generates a 5 V output for input bias voltages greater than 5.5 V.

The ADP1828 operates at a pin-selectable, fixed switching frequency of either 300 kHz or 600 kHz, or at any frequency between 300 kHz and 600 kHz with a resistor. The switching frequency can also be synchronized to an external clock up to 2× the part’s nominal oscillator frequency. The clock output can be used for synchronizing additional ADP1828s (or the ADP1829 controllers), thus eliminating the need for an external clock source. The ADP1828 includes soft start protection to limit any inrush current from the input supply during startup, reverse current protection during soft start for a precharged output, as well as a unique adjustable lossless current-limit scheme utilizing external MOSFET R_DSON sensing.

For applications requiring power-supply sequencing, the ADP1828 provides a tracking input that allows the output voltage to track during startup, shutdown, and faults. The additional supervisory and control features include thermal overload, undervoltage lockout, and power good.

The ADP1828 operates over the −40°C to +125°C junction temperature range and is available in a 20-lead QSOP.

Applications

Telecom and networking systems

Base station power

Set-top boxes, game consoles

Printers and copiers

Medical imaging systems

DSP and microprocessor core power supplies

DDR termination

Data Sheet, Rev. 0, 10/07

Part#	Vin Range	Pwr Stage Vin	Vout Adj Options	Multi-Output	Shutdown Current	Supply Current (max)	Switching Frequency	Iout (max)	Synchronous	Step Down	Step Up	Pkg	Product Description	Price* (1000-4999)
ADP1621	2.9V-5.5V	As Low As 1V	Lossless ISens@<30V Vout, Resistor ISens@>30V	No	10µA	3mA	100 KHz - 1.5 MHz	-	No	No	Yes	MSOP-10	Constant-Frequency, Current-Mode, Step-Up DC/DC Controller	$1.30
ADP1821	3.7V-5.5V	1V-24V	0.6V to 85% PwrStgVin	No	10µA	2mA	300 kHz -600 kHz, Sync up to 1 MHz	20A	Yes	Yes	No	QSOP-16	20 A Step-Down DC-DC Controller	$1.35
ADP1822	3.7V-5.5V	1V-24V	0.6V to 85% PwrStgVin	No	10µA	2mA	300 kHz-600 kHz; Sync up to 1 MHz	20A	Yes	Yes	No	QSOP-24	20 A, PWM, Step-Down DC-DC Controller with Margining and Tracking	$1.40
ADP1823	3.7V-20V	1V-24V	0.6V to 85% PwrStgVin	Yes	20µA	3mA	300 kHz-600 kHz, Sync up to 1 MHz	20A	Yes	Yes	No	LFCSP-32	Versatile Dual, Interleaved Synchronous PWM Buck Controller w/ Tracking	$2.10
ADP1828	3.0V-18V	1V-24V	0.6V to 85% PwrStgVin	No	15µA	3mA	300 kHz to 600 kHz	-	Yes	Yes	No	QSOP-20	Synchronous Buck PWM, Step-Down, DC-to-DC Controller	$1.50
ADP1829	3.0V-18V	1V-24V	0.6V to 85% PwrStgVin	Yes	20µA	3mA	300 kHz-600 kHz, Sync up to 1 MHz	20A	Yes	Yes	-	LFCSP-32	Dual, Interleaved, Step-Down DC-to-DC Controller w/ Tracking	$2.10
ADP1864	3.15V-14V	3.15V-14V	0.8V to Vin	No	15µA	350µA	580 kHz	5A	No	Yes	No	TSOT-6	5A, Constant Frequency, Current-Mode Step-Down DC/DC Controller in TSOT	$1.05

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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This is the acceptable operating range of the device. The various ranges specified are as follows:

• Commercial: 0 to +70 degrees Celsius
• Military : -55 to +125 degrees Celsius
• Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
• Automotive: -40 to +125 degrees Celsius

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