R2J20701NP_08 RENESAS [Renesas Technology Corp], R2J20701NP_08 Datasheet - Page 5

• Manufacturer Part Number: R2J20701NP_08
• Description: Peak Current Mode Synchronous Buck Controller with Power MOS FETs
• Manufacturer: RENESAS [Renesas Technology Corp]

R2J20701NP
Pin Description
VIN
SW
PGND
SGND
VCIN
BOOT
REG5
ON/OFF
IREF
CT
SYNC
TRK-SS
FB
EO
Ishare
RAMP
CS
DRV5
REJ03G1459-0400 Rev.4.00 Jun 30, 2008
Page 5 of 27
Pin Name
9, 21, 40 to 48
Pin No.
10 to 20
22 to 39
6, 52
50
55
49
56
54
53
51
7
5
4
1
3
8
2
Input voltage for the buck converter.
Switching node. Connect a choke coil between the
SW pin and dc output node of the converter.
Ground of the power stage.
Ground of the IC chip.
Input voltage for the control circuit.
Bootstrap voltage pin. A bootstrap capacitor should
be connected between the BOOT and SW pin.
+5 V logic power-supply output.
Signal disable pin.
Reference current generator for the IC.
Timing capacitor pin for the oscillator. This pin has a
select function for operation in slave mode.
I/O pin for synchronous operation.
Start-up timing control input.
Feedback voltage input for the closed loop.
Error amplifier output pin.
For current-sharing bus.
RAMP signal input pin for peak current mode PWM
control.
Current output pin of active current sensing circuit.
+5.25 V generator output for driving power MOS
FETs.
Description
Should be externally connected to
SGND.
Should be externally connected to
PGND.
Should be externally connected to VIN.
To be supplied +5 V through the
internal SBD.
Requires decoupling from the GND
plane by a capacitance 0.1 µF.
Disabled when ON/OFF pin is in the
low state.
Should be connected via 27 kΩ to the
SGND pin.
If the pin voltage is <1 V or >4 V, the IC
operates in slave mode.
Requires connection to an RC circuit
for loop compensation.
Simply connect the Ishare pins of all
devices to get balanced current.
Appropriate resistance is required
between CS and the GND plane.
Requires decoupling from the GND
plane by a capacitance from 0.1 µF to
1.0 µF.
Remarks