IRDCIP1837 International Rectifier, IRDCIP1837 Datasheet - Page 2

• Manufacturer Part Number: IRDCIP1837
• Description: Reference Design kit for the iP1837 a 600kHz, 35A SupIRBuck Synchronous Buck Converter
• Manufacturer: International Rectifier

Specifications of IRDCIP1837

• Package: Design Kit
• Featured Part: iP1837
• Input Voltage (v): 12V
• Output Voltage (v): 1.05V
• Switching Frequency (khz): 600kHz

CONNECTIONS and OPERATING INSTRUCTIONS
A well regulated +12V input supply should be connected to VIN+ and VIN-. A maximum 35A load should be
connected to VOUT+ and VOUT-. The inputs and outputs of the board are listed in Table I.
iP1837 has two input supplies, one for biasing (Vcc) and the other as input voltage (Vin). Separate supplies
should be applied to these inputs. Vcc input should be a well regulated 3.13V-3.46V supply and it would be
connected to Vcc+ and Vcc-.
External Enable signal can be applied to the board via exposed Enable pad and
this purpose, For proper operation of iP1837, the voltage at Enable should always be kept below Vcc.
LAYOUT
The PCB is a 6-layer board. All of layers are 2 Oz. copper. The iP1837 and most of the passive
components are mounted on the top side of the board.
Power supply decoupling capacitors and feedback components are located close to iP1837. The
feedback resistors are connected to the output of the remote sense amplifier of the iP1837 and are
located close to the iP1837. To improve efficiency, the circuit board is designed to minimize the length
of the on-board power ground current path. Separate power ground and analog ground are used and
may be connected together using a 0 ohm resistor at one of two possible locations
1/11/2011
Connection
VIN+
VIN-
Vcc+
Vcc-
VOUT-
VOUT+
Enable
P_Good
Table I. Connections
Signal Name
V
Ground of V
Vcc input
Ground for Vcc input
Ground of V
V
Enable
Power Good Signal
in
out
(+12V)
(+1.8V)
in
out
IRDCiP1837
R18 should be removed for
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