R2J20701NP Datasheet, PDF (1/28 Pages) Renesas Technology Corp – Peak Current Mode Synchronous Buck Controller with Power MOSFETs

R2J20701NP
Peak Current Mode Synchronous Buck Controller
with Power MOS FETs
REJ03G1459-0300
Rev.3.00
Jun 20, 2007
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 (35 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)
Applications
• Network equipment
• Telecommunications equipment
• Servers
• POL modules
Typical Characteristic Curve
95
90
VIN = 12 V
VOUT = 1.8 V
85
L = 440 nH
CO = 600 µF
80
Frequency = 500 kHz
No airflow
Ta = 27°C
75
0 5 10 15 20 25 30 35
Iout (A)
REJ03G1459-0300 Rev.3.00 Jun 20, 2007
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