R2J20702NP Datasheet, PDF (1/28 Pages) Renesas Technology Corp – Peak Current Mode Synchronous Buck Controller with Power MOS FETs

Target Specification Datasheet
R2J20702NP
Peak Current Mode Synchronous Buck Controller
with Power MOS FETs
REJ03G1782-0401
Rev.4.01
Jun 17, 2010
Description
This all-in-one SiP for POL (point-of-load) applications is a multi-chip module incorporating a high-side MOS FET,
low-side MOS FET, and PWM controller in a single QFN package. The on and off timing of the power MOS FET is
optimized by the built-in driver circuit, making this device suitable for large-current high-efficiency buck converters.
In a simple peak-current mode topology, stable operation is obtained in a closed power loop, and a fast converter is
easily realized with the addition of simple components. Furthermore, the same topology can be applied to realize
converters for parallel synchronized operation with current sharing, and two-phase operation.
The package also incorporates a high-side bootstrap Schottky barrier diode (SBD), eliminating the need for an external
SBD for this purpose.
Features
 Three chips in one package for high-efficiency and space saving
 Large average output current (40 A)
 Wide input voltage range: 8 to 14 V
 0.6 V reference voltage accurate to within 1%
 Wide programmable switching frequency: 200 kHz to 1 MHz
 Fast response by peak-current-mode topology.
 Simple current sharing (up to five modules in parallel)
 Two-phase operation in parallel operation
 Built-in SBD for boot strapping
 On/off control
 Hiccup operation under over load condition
 Tracking function
 Thin small package: 56-pin QFN (8 mm  8 mm)
 Terminal Pb-free/Halogen-free
Applications
 Network equipment
 Telecommunications equipment
 Servers
 POL modules
Typical Characteristic Curve
95
VIN = 12 V
90
VOUT = 1.8 V
L = 320 nH
85
CO = 600 μF
Frequency = 500 kHz
No airflow
80
Ta = 27°C
75
0 5 10 15 20 25 30 35 40
Iout (A)
REJ03G1782-0401 Rev.4.01
Jun 17, 2010
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