Features and Benefits
- Wide range input: 2.75 V to 20 V
- Power stage input voltage: 1 V to 20 V
- Output voltage range: 0.6 V up to 90% VIN
- Output current to more than 25 A per channel
- Accurate current sharing between channels (interleaved)
- Programmable frequency: 200 kHz to 1.5 MHz
- 180° phase shift between channels for reduced input capacitance
- ±0.85% reference voltage accuracy from −40°C to +85°C
- Integrated boost diodes
- Power saving mode (PSM) at light loads
- Accurate power good with internal pull-up resistor
- Accurate voltage tracking capability
- Independent channel precision enable
- Overvoltage and overcurrent limit protection
- Externally programmable soft start, slope compensation and current sense gain
- Synchronization input
- Thermal overload protection
- Input undervoltage lockout (UVLO)
- Available in 32-lead 5 mm × 5 mm LFCSP
The ADP1850 is a configurable dual output or two-phase, single output dc-to-dc synchronous buck controller capable of running from commonly used 3.3 V to 12 V (up to 20 V) voltage inputs. The device operates in current mode for improved transient response and uses valley current sensing for enhanced noise immunity.
The architecture enables accurate current sharing between interleaved phases for high current outputs.
The ADP1850 is ideal in system applications requiring multiple output voltages: the ADP1850 includes a synchronization feature to eliminate beat frequencies between switching devices; provides accurate tracking capability between supplies and includes precision enable for simple, robust sequencing.
The ADP1850 provides high speed, high peak current drive capability with dead-time optimization to enable energy efficient power conversion. For low load operation, the device can be configured to operate in power saving mode (PSM) by skipping pulses and reducing switching losses to improve the energy efficiency at light load and standby conditions.
The accurate current limit (±6%) allows the power architect to design within a narrower range of tolerances and can reduce overall converter size and cost.
The ADP1850 provides a configurable architecture capable of wide range input operation to provide the designer with maximum re-use opportunities and improved time to market. Additional flexibility is provided by external programmability of loop compensation, soft start, frequency setting, power saving mode, current limit and current sense gain can all be programmed using external components.
The ADP1850 includes a high level of integration in a small size package. The start-up linear regulator and the boot-strap diode for the high side drive are included. Protection features include: undervoltage lock-out, overvoltage, overcurrent/short-circuit and over temperature. The ADP1850 is available in a compact 32-lead LFCSP 5 mm × 5 mm thermally enhanced package.
High current single and dual output intermediate bus and point of load converters requiring sequencing and tracking capability, including converters for:
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
This describes the design, operation, and test results of the ADP1850DP-EVALZ operating in dual-phase mode and the ADP1850SP-EVALZ operating in single-phase mode.
The input range for this evaluation board is 10 V to 15 V, and the regulated output voltage is 1.09 V with a maximum 50 A output current. A switching frequency (fSW) of 300 kHz is chosen to achieve a good balance between efficiency and the sizes of the power components.
The input range for the ADP1850SP-EVALZ evaluation board is 10 V to 20 V, and the two regulated output voltages are set to 3.3 V (VOUT1) and 1.8 V (VOUT2) with a maximum 14 A output current. A switching frequency (fSW) of 600 kHz is chosen to achieve a good balance between efficiency and the sizes of the power components.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
ADIsimPower is the fastest and most accurate Power Management design tool. ADI's Design Center lets you design your power circuits in three easy steps.
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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.