ADP1874

www.DataSheet4U.net Synchronous Buck Controller with Constant On-Time and Valley Current Mode ADP1874/ADP1875 FEATURES Power input voltage range: 2.95 V to 20 V On-board bias regulator Minimum output voltage: 0.6 V 0.6 V reference voltage with ±1.0% accuracy Supports all N-channel MOSFET power stages Available in 300 kHz, 600 kHz, and 1.0 MHz options No current-sense resistor required Power saving mode (PSM) for light loads (ADP1875 only) Resistor programmable current limit Power good with internal pull-up resistor Externally programmable soft start Thermal overload protection Short-circuit protection Standalone precision enable input Integrated bootstrap diode for high-side drive Starts into a precharged output Available in a 16-lead QSOP package TYPICAL APPLICATIONS CIRCUIT VIN = 2.95V TO 20V CC RC VREG VOUT CC2 ADP1874/ ADP1875 COMP EN FB GND BST DRVH SW DRVL CBST VIN CIN Q1 10kΩ RTOP RBOT L VOUT COUT Q2 RPGD CSS RTRK2 RTRK1 VEXT LOAD CVREG2 CVREG RRES VREG PGOOD SS VREG_IN RES TRACK PGND VMASTER 09347-001 Figure 1. Typical Applications Circuit 100 95 90 85 80 EFFICIENCY (%) VIN = 5V (PSM) APPLICATIONS Telecom and networking systems Mid- to high-end servers Set-top boxes DSP core power supplies 75 70 65 60 55 50 45 40 VIN = 16.5V (PSM) 35 30 25 10 100 VIN = 13V (PSM) TA = 25°C VOUT = 1.8V fSW = 300kHz WÜRTH INDUCTOR: 744325120, L = 1.2µH, DCR = 1.8mΩ INFINEON FETs: BSC042N03MS G (UPPER/LOWER) 1k LOAD CURRENT (mA) 10k 100k 09347-102 VIN = 16.5V VIN = 13V ...