The ADP2503/ADP2504 are high efficiency, low quiescent current step-up/step-down dc-to-dc converters that can operate at input voltages above, below, or equal to the regulated output voltage. The power switches and synchronous rectifiers are internal to minimize external part count and maximize efficiency. At high load currents, the ADP2503/ADP2504 use a currentmode, fixed frequency PWM control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP2503/ADP2504 have an optional power-saving pulse skip mode that reduces the switching frequency under light load conditions to save power. For wireless and other low noise applications where variable frequency pulse skip mode may cause interference, a logic control input forces fixed frequency PWM operation under all load conditions

The ADP2503/ADP2504 can run from input voltages between 2.3 V and 5.5 V, making them ideal for single Li+/Li-polymer cell and multiple alkaline/NiMH cell applications where the output voltage is within the battery voltage range. The ADP2503/ ADP2504 have fixed output options ranging from 2.8 V to 5 V. Compensation is internal to minimize the number of external components.

During logic-controlled shutdown, the input is disconnected from the output and draws less than 1 μA from the input source. Other key features include under voltage lockout to prevent deep battery discharge and soft start to prevent input current overshoot at startup.

Applications

1-cell Li+/Li-polymer devices

Wireless handsets

Digital cameras/portable audio players

Miniature hard disk power supplies

USB powered devices

Data Sheet, Rev. PrA, 5/08

Part#	Vin Range	Vout Preset Options	Vout Adj Options	Iout (max)	Isw (Peak)	Supply Current (max)	Switching Frequency	Step Down	Step Up	Inverting	Pkg	Product Description	Price* (1000-4999)	Pos Supply
ADP1111	2V-30V	12.0V, 3.3V, 5.0V	1.2V to 30V, 1.2V to Vin	1.5A	1.5A	110µA	70 kHz	Yes	Yes	Yes	Plastic DIP-8, SOIC-8	Micropower Step Up/Down/Inverting Switching Regulator; Adjustable or Fixed 3.3V, 5V, 12V	$2.05	+2 to +30
ADP1611	2.5V-5.5V	---	Vin to 20V	1.2A	1.2A	600µA	1.2 MHz	-	Yes	-	MSOP-8	20 V,1.2 MHz Step-Up DC-to-DC Switching Converter	$1.14	+2.5 to +5.5
ADP1610	2.5V-5.5V	---	Vin to 12V	1.2A	1.2A	600µA	700 kHz or 1.2 MHz	-	Yes	-	MSOP-8	1.2 MHz DC-DC Step-Up (Boost) Switching Converter w/ Integrated Power Switch	$1.27	+2.5 to +5.5
ADP2102	2.7V-5.5V	0.8V, 1.0V, 1.25V, 1.2V, 1.375V, 1.5V, 1.875V, 1.8V	0.8V to 3.3V	0.6A	-	99µA	3 MHz	Yes	-	-	LFCSP-8	3 MHz Synchronous Step-Down DC-to-DC Converter	$1.23	+2.7 to +5.5
ADP3051	2.7V-5.5V	---	0.8V to 5.5V	0.5A	-	300µA	550 kHz	Yes	-	-	MSOP-8	500 mA PWM Step-Down DC-DC Converter with Synchronous Rectifier	$2.65	+2.7 to +5.5
ADP2105	2.7V-5.5V	1.2V, 1.5V, 1.8V, 3.3V	0.8V to Vin	1A	-	30µA	1.2 MHz	Yes	-	-	LFCSP-16	1A Synchronous Step-Down DC-DC Converter	$1.13	+2.7 to +5.5
ADP2106	2.7V-5.5V	1.2V, 1.5V, 1.8V, 3.3V	0.8V to Vin	1.5A	-	30µA	1.2 MHz	Yes	-	-	LFCSP-16	1.5A Synchronous Step-Down DC-DC Converter	$1.25	+2.7 to +5.5
ADP2107	2.7V-5.5V	1.2V, 1.5V, 1.8V, 3.3V	0.8V to Vin	2A	-	30µA	1.2 MHz	Yes	-	-	LFCSP-16	2A Synchronous Step-Down DC-DC Converter	$1.32	+2.7 to +5.5
ADP3050	3.6V-30V	3.3V, 5.0V	1.25V to 12V	1.5A	-	1.5mA	200 kHz	Yes	Yes	Yes	SOIC-8	200 kHz, 1 Amp, High-Voltage Step-Down Switching Regulator	$1.80	+3.6 to +30

* 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.

The model number is a specific version of a generic that can be purchased or sampled.

Status indicates the current lifecycle of the product. This can be one of 4 stages:

• Pre-Release: The model has not been released to general production, but samples may be available.
• Production: The model is currently being produced, and generally available for purchase and sampling.
• Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
• Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).

The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

For detailed drawings and chemical composition please consult our  Package Site

Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

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

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.
Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.