R2J20751NP Datasheet, PDF (1/26 Pages) Renesas Technology Corp – Peak Current Mode Synchronous Buck Controller with Power MOS FETs

Preliminary Datasheet
R2J20751NP
Peak Current Mode Synchronous Buck Controller
with Power MOS FETs
R07DS0240EJ0100
Rev.1.00
Jan 26, 2011
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 multi-phase operation. The package also
incorporates a high-side bootstrap switch (Boot switch), eliminating the need for an external SBD for this purpose.
Features
 Three chip in one package for high efficiency and space saving
 Large average output current (25 A)
 Wide input voltage range: 3.3 V to 27 V
 0.6 V reference voltage accurate to within 2%
 Wide programmable switching frequency: 200 kHz to 1 MHz
 Peak current mode topology with Active Current Sensing
 Slope compensation function
 Current sensing error: 1.5 A maximum @15 A load current
 Built-in Boot switch for boot strapping
 ON/OFF control
 Hiccup operation under over load condition
 Tracking function
 Thin and small package: QFN40 pins (6 mm  6 mm)
 Power Good function
 Over voltage protection
 Pre-OVP function
Applications
 Mother board
 Servers
Typical Characteristic Curve
96
94
VIN = 5V
VOUT = 1.5V
92
Frequency = 500kHz
90
88
86
84
82
80
0
5
10
15
20
25
Output Current Iout (A)
R07DS0240EJ0100 Rev.1.00
Jan 26, 2011
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