Features and Benefits
- Input voltage range: 2.75 V to 20 V
- Output voltage range: 0.6 V to 90% VIN
- Maximum output current of more than 25 A
- Current mode architecture with current sense input
- Configurable to voltage mode
- ±1% output voltage accuracy over temperature
- Voltage tracking input
- Programmable frequency: 200 kHz to 1.5 MHz
- Synchronization input
- Internal clock output
- Power saving mode at light load
- Precision enable input
- Power good with internal pull-up resistor
- Adjustable soft start
- Programmable current sense gain
- Integrated bootstrap diode
- Starts into a precharged load
- Externally adjustable slope compensation
- Suitable for any output capacitor
- Overvoltage and overcurrent-limit protection
- Thermal overload protection
- Input undervoltage lockout (UVLO)
- Available in 20-lead, 4 mm × 4 mm LFCSP
- Supported by ADIsimPower™ design tool
The ADP1853 is a wide range input, 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 nominally operates in current mode with valley current sensing providing the fastest step response for digital loads. It can also be configured as a voltage mode controller with low noise and crosstalk for sensitive loads.
The ADP1853 can be used as a master synchronization clock for the power system and for convenient synchronization between controllers. The CLKOUT signal can synchronize other devices in the ADP185x family such that slave devices are phase-shifted from the master to reduce the input ripple current, improve EMI, and reduce the size of the input bulk capacitance. The ADP1853 can also be configured as a slave device for current sharing. Additionally, the ADP1853 includes accurate tracking, precision enable, and power good functions for sequencing. The ADP1853 provides a high speed, high peak current gate driving capability to enable energy efficient power conversion. The device can be configured to operate in power saving mode by skipping pulses, reducing switching losses and improving efficiency at light load and standby conditions.
The accurate current limit allows design within a narrower range of tolerances and can reduce overall converter size and cost. The ADP1853 can regulate down to 0.6 V output using a high accuracy reference with ±1% tolerance over the temperature range from −40°C to 125°C.
With a wide range input voltage, the ADP1853 is designed to provide the designer with maximum flexibility for use in a variety of system configurations; loop compensation, soft start, frequency setting, power saving mode, current limit, and current sense gain can all be programmed using external components. In addition, the external RAMP resistor allows choosing optimal slope and VIN feedforward in both current and voltage mode for excellent line rejection. The linear regulator and the boot strap diode for the high-side driver are internal.
Protection features include undervoltage lock out, overvoltage, overcurrent/short circuit, and overtemperature.Applications
- Intermediate bus and POL systems requiring sequencing and tracking, including
- Telecom base station and networking
- Industrial and Instrumentation
- Medical and healthcare
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 ADP1853-EVALZ. The input range for this evaluation board is 9 V to 15 V, and the regulated output voltage is 3.3 V with a maximum 20 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.
Documentation & Resources
UG-431: Evaluation Board for the ADP1853 Step-Down DC-to-DC Controller6/27/2012625 kB
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:
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
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|ADP1853ACPZ-R7||Material Declaration||Reliability Data||20-Lead LFCSP (4mm x 4mm w/ EP)|
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.