Synchronous Current-Mode
Synchronous Current-Mode with Constant On-Time, PWM Buck Controller
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ADP1882/ADP1883
FEATURES
Power ...
Description
Synchronous Current-Mode with Constant On-Time, PWM Buck Controller
www.DataSheet4U.com
ADP1882/ADP1883
FEATURES
Power input voltage as low as 2.75 V to 20 V Bias supply voltage range: 2.75 V to 5.5 V Minimum output voltage: 0.8 V 0.8 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 (ADP1883 only) Resistor-programmable current-sense gain Thermal overload protection Short-circuit protection Precision enable input Integrated bootstrap diode for high-side drive 140 μA shutdown supply current Starts into a precharged load Small, 10-lead MSOP package
TYPICAL APPLICATIONS CIRCUIT
VIN = 2.75V TO 20V
CC RTOP RC CC2
VIN
ADP1882/ ADP1883
COMP/EN BST CBST FB DRVH SW
CIN
VOUT
Q1
L
VOUT
RBOT GND CVDD2 VDD COUT Q2 RRES LOAD
DRVL PGND
Figure 1.
100 95 90 85 80
EFFICIENCY (%)
APPLICATIONS
Telecom and networking systems Mid to high end servers Set-top boxes DSP core power supplies
VDD = 5.5V, VIN = 13.0V VDD = 5.5V, VIN = 16.5V VDD = 5.5V, VIN = 5.5V (PSM) VDD = 5.5V, VIN = 5.5V VDD = 3.6V, VIN = 5.5V
75 70 65 60 55 50 45 40 35 30 25 100 1k TA = 25°C VOUT = 1.8V fSW = 300kHz WURTH INDUCTOR: 744325120, L = 1.2µH, DCR = 1.8mΩ INFINEON MOSFETs: BSC042N03MS G (UPPER/LOWER) 10k 100k
08901-002
LOAD CURRENT (mA)
Figure 2. ADP1882/ADP1883 Efficiency vs. Load Current (VOUT = 1.8 V, 300 kHz)
GENERAL DESCRIPTION
The ADP1882/AD...
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