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ADP1877

Analog Devices
Part Number ADP1877
Manufacturer Analog Devices
Description Dual Output Synchronous Buck PWM Controller
Published Mar 18, 2010
Detailed Description Dual Output Synchronous Buck PWM Controller With Tracking ADP1877 www.DataSheet4U.com FEATURES Input voltage range: 2.7...
Datasheet PDF File ADP1877 PDF File

ADP1877
ADP1877

Overview
Dual Output Synchronous Buck PWM Controller With Tracking ADP1877 www.
DataSheet4U.
com 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 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.
VIN RAMP1 RAMP1 EN1 EN2 VDL VCCO PGOOD1 PGOOD2 TRK1 TRK2 SYNC FREQ VIN M1 DH1 BST1 SW1 ILIM1 FB1 DL1 RCSG1 PGND1 RRAMP2 RAMP2 M3 VIN L1 VOUT1 RTOP1 M2 RBOT1 COMP1 COMP2 DH2 BST2 SW2 ILIM2 FB2 L2 VOUT2 RTOP2 M4 APPLICATIONS Set top boxes Printers Communication infrastructure Distributor power dc systems Industrial and instrumentation SS1 SS2 AGND DL2 RCSG2 PGND2 RBOT2 08299-001 Figure 1.
Typical Operation Circuit 1.
0 0.
9 0.
8 0.
7 EFFICIENCY VO = 3.
3V PSM VO = 1.
8V PSM 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 int...


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