iru3047 International Rectifier Corp., iru3047 Datasheet - Page 4

• Manufacturer Part Number: iru3047
• Description: Dual Synchronous Controller With Current Sharing Circuitry Controller
• Manufacturer: International Rectifier Corp.

IRU3047
PIN#
BLOCK DIAGRAM
4
9,12
Comp2
Comp1
10
15
16
17
19
20
11
V
Vp2
Gnd
Fb2
Vcc
Fb1
REF
Fb3
SS
POR
17
18
16
20
4
1
2
3
6
5
PIN SYMBOL
LDrv2, LDrv1
1.25V
Fb2 Monitor
1.25V
Shut Down
PGood
PGnd
V
25uA
Gnd
Fb3
V
SS
OUT3
CL
25K
25K
25K
25K
25K
25K
1.25V
Output driver for the synchronous power MOSFET.
This pin serves as the separate ground for MOSFET’s driver and should be connected to
the system’s ground plane.
Supply voltage for the low side output drivers.
Driver signal for the LDO’s external transistor.
LDO’s feedback pin, connected to a resistor divider to set the output voltage of LDO.
Soft-Start pin. The converter can be shutdown by pulling this pin below 0.5V.
Power Good pin. This pin is a collector output that switches Low when any of the outputs
are outside of the specified under voltage trip point.
Ground pin.
PIN DESCRIPTION
40mA LDO Controller
64uA Max
Error Amp1
Error Amp2
Figure 2 - Block diagram of the IRU3047.
Vcc
Fb1
Fb2
Fb3
Ramp1
Ramp2
www.irf.com
PWM Comp1
PWM Comp2
VcH1
VcH2
Two Phase
Oscillator
PGood
0.5V
3.5V / 3.3V
4.2V / 4.0V
3.5V / 3.3V
Set1
Set2
Generator
Bias
Reset Dom
Reset Dom
R
S
S
R
UVLO
POR
Q
Q
3V
1.25V
POR
SS
2V
SS > 2V
10
14
13
11
12
19
15
09/09/02
7
8
9
Rev. 1.0
V c H 1
V
LDrv1
V c H 2
HDrv2
LDrv2
PGnd
PGood
HDrv1
V
CL
OUT3