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ADP1877ACPZ-R7 Arkusz danych(PDF) 1 Page - Analog Devices |
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ADP1877ACPZ-R7 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 32 page Dual Output Synchronous Buck PWM Controller With Tracking ADP1877 Rev. 0 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved. FEATURES Input voltage range: 2.75 V to 14.5 V Output voltage range: 0.6 V to 0.9 V Maximum output current 20 A or higher per channel Programmable frequency: 200 kHz to 1.5 MHz Flexmode® architecture with integrated drivers 180° phase shift minimizes input ripple current and required input capacitance ±0.85% output voltage accuracy 0°C to 70°C Integrated boost diodes Pulse skip high efficiency mode under light load Power good with internal pull-up resistor Overvoltage and overcurrent limit protection Thermal overload protection Input undervoltage lockout (UVLO) Externally adjustable soft start, slope compensation and current sense gain Independent precision enable inputs Synchronization input Suitable for any output capacitors Available in 32-lead 5 mm × 5 mm LFCSP APPLICATIONS Set top boxes Printers Communication infrastructure Distributor power dc systems Industrial and instrumentation GENERAL DESCRIPTION The ADP1877 is a Flexmode® (proprietary architecture of Analog Devices, Inc.), dual-channel, step-down switching controller with integrated drivers that drive N-channel synchronous power MOSFETs. The two PWM outputs are phase shifted 180°, which reduces the input RMS current, thus minimizing required input capacitance. The boost diodes are built into the ADP1877, thus lowering the overall system cost and component count. The ADP1877 can be set to operate in pulse skip high efficiency mode under light load or in PWM continuous conduction mode. The ADP1877 includes externally adjustable soft start, output overvoltage protection, externally adjustable current limit, power good, and a programmable oscillator frequency that ranges from 200 kHz to 1.5 MHz. The ADP1877 provides an output voltage accuracy of ±0.85% from 0°C to 85°C and ±1.5% from −40°C to 125°C in junction temperature. This part can be powered from a 2.75 V to 14.5 V supply, operates over the −40oC to +125oC junction temperature range, and is available in a 32-lead 5 mm × 5 mm LFCSP package. RAMP1 RAMP1 VIN DH1 BST1 SW1 ILIM1 FB1 DL1 PGND1 RAMP2 DH2 BST2 SW2 ILIM2 FB2 DL2 PGND2 EN1 EN2 VDL VCCO PGOOD1 PGOOD2 TRK1 TRK2 SYNC FREQ COMP1 COMP2 SS1 SS2 AGND RCSG1 RTOP1 M1 M2 RBOT1 RCSG2 RTOP2 M3 L2 L1 VOUT1 VOUT2 VIN VIN M4 RBOT2 RRAMP2 Figure 1. Typical Operation Circuit 0.01 0.1 1 10 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 VO = 3.3V PSM VO = 3.3V PWM VO = 1.8V PSM VO = 1.8V PWM VIN = 12V, 300kHz LOAD (A) Figure 2. Efficiency Plot of Figure 42, 20 A Output |
Podobny numer części - ADP1877ACPZ-R7 |
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Podobny opis - ADP1877ACPZ-R7 |
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