IRDC3898 International Rectifier, IRDC3898 Datasheet - Page 2

• Manufacturer Part Number: IRDC3898
• Description: Power Management IC Development Tools Design Kit POL IC
• Manufacturer: International Rectifier
• Type: DC/DC Converters, Regulators & Controllersr

Specifications of IRDC3898

• Product: Evaluation Boards
• Tool Is For Evaluation Of: IR3898
• Input Voltage: 12 V
• Output Voltage: 1.2 V
• Factory Pack Quantity: 1

CONNECTIONS and OPERATING INSTRUCTIONS
A well regulated +1.5V input supply should be connected to VIN+ and VIN-. A maximum of 4.3A load should
be connected to VOUT+ and VOUT-. The inputs and output connections of the board are listed in Table I.
IR3898 has an internal LDO which generates Vcc from Vin.
connected between Vin pin and PGnd. (Vin can be applied across C32 capacitor.)
pin and Vcc/LDOout pins should be shorted together for external Vcc operation.
External Enable signal must be applied to the board between Enable and Agnd pins.
If operation with external Vcc is required, then external Vcc can be applied between Vcc+ and Vcc- pins. Vin
LAYOUT
The PCB is a 4-layer board. All layers use 2 Oz. copper. The IR3898 and other major power
components are mounted on the top side of the board.
Power supply decoupling capacitors, the bootstrap capacitor and feedback components are located
close to IR3898. To improve efficiency, the circuit board is designed to minimize the length of the on-
board power ground current path.
3/17/2011
This evaluation board is a preliminary version meant for the engineering evaluation of the IR3898.
Based on the results of the continuing evaluation, this board can evolve and change without notice
VIN+
VIN-
Vout+
Vout-
Vcc+
Vcc-
Enable
P_Good
AGnd
Connection
Table I. Connections
Confidential
Vin (+12V)
Ground of Vin
Vout(+1V0)
Ground for Vout
Vcc/ LDO_out Pin
Ground for Vcc input
Enable
Power Good Signal
Analog ground
Signal Name
To use internal LDO, 12V input should be
IRDC3898-Vtt rail
2