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ADP1850 Dataheets PDF



Part Number ADP1850
Manufacturers Analog Devices
Logo Analog Devices
Description DC-to-DC Synchronous Buck Controller
Datasheet ADP1850 DatasheetADP1850 Datasheet (PDF)

Data Sheet Wide Range Input, Dual/Two-Phase, DC-to-DC Synchronous Buck Controller ADP1850 FEATURES 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.

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Data Sheet Wide Range Input, Dual/Two-Phase, DC-to-DC Synchronous Buck Controller ADP1850 FEATURES 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 APPLICATIONS High current single and dual output intermediate bus and point of load converters requiring sequencing and tracking capability, including converters for: Point-of-load power supplies Telecom base station and networking Consumer Industrial and instrumentation Healthcare and medical GENERAL DESCRIPTION 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. Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 09440-001 TYPICAL OPERATION CIRCUIT VIN RRAMP1 RAMP1 VIN ADP1850 EN1 DH1 EN2 BST1 VDL M1 L1 VCCO TRK1 TRK2 SW1 ILIM1 FB1 DL1 R11 M2 R12 PGOOD1 RCSG1 PGOOD2 PGND1 HI LO SYNC FREQ RRAMP2 RAMP2 VIN COMP1 COMP2 SS1 SS2 AGND DH2 BST2 SW2 ILIM2 FB2 DL2 PGND2 M3 L2 R21 RCSG2 M4 R22 VOUT1 VOUT2 Figure 1. Single Phase Circuit 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2010–2017 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADP1850 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Typical Operation Circuit................................................................ 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution........


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