iru3072 International Rectifier Corp., iru3072 Datasheet - Page 3

• Manufacturer Part Number: iru3072
• Description: 20-pin Synchronous Pwm Controller/ 3 Ldo Controller -
• Manufacturer: International Rectifier Corp.

PARAMETER
Soft-Start Section
Charge Current
Error Amp
Fb Voltage Input Bias Current
Fb Voltage Input Bias Current
Transconductance
Oscillator
Frequency
Ramp Amplitude
Output Drivers
Rise Time
Fall Time
Dead Band Time 1
Dead Band Time 2
Max Duty Cycle
Min Duty Cycle
LDO Controller Section
Drive Current
Fb Voltage
Input Bias Current
Thermal Shutdown
Current Limit
OC Threshold Set Current
OC Comp Off-Set Voltage
Note 1: Guaranteed by design but not tested in production.
PIN DESCRIPTIONS
PIN#
Rev. 1.0
3/25/04
1
2
3
4
5
6
7
8
9
PIN SYMBOL
VccLDO
PGnd
HDrv
Drv4
Drv3
Drv2
LDrv
Gnd
Vcc
Outputs of the linear regulator controllers.
This pin provides power for the LDO controllers.
This pin provides biasing for the internal blocks of the IC as well as power for the low side
driver. A minimum of 1mF, high frequency capacitor must be connected from this pin to
ground to provide peak drive current capability.
Output driver for the synchronous power MOSFET.
This pin serves as the ground pin and must be connected directly to the ground plane. A
high frequency capacitor (0.1 to 1mF) must be connected from Vcc, Vc and VccLDO pins
to this pin for noise free operation.
This pin serves as the separate ground for MOSFET's driver and should be connected to
system's ground plane.
Output driver for the high side power MOSFET. Connect a diode, such as BAT54 or 1N4148,
from this pin to ground for the application when the inductor current goes negative (Source/
Sink), soft-start at no load and for the fast load transient from full load to no load.
PIN DESCRIPTION
V
SS I
OC(OFFSET)
V
I
SYM
D
Freq
D
OCSET
T
I
I
RAMP
FB1
FB2
Tr
Tf
MAX
MIN
DB
B1
,I
B2
SS1=SS2=0V
SS1=3V
SS1=0V
Rt=100K
Rt=39K
Note 1
C
Vcc=12V
C
Vcc=12V
Vcc=12V, C
HDrv falls,LDrv rises
Vcc=12V, C
Fb=0.7V, Freq=200KHz
Fb=0.9V
Drv2, 3 and 4
Note 1
LDrv falls, HDrv rises
LOAD
LOAD
=3000pF (10% to 90%)
=3000pF (90% to 10%),
www.irf.com
TEST CONDITION
LOAD
LOAD
=3000pF
=3000pF
0.784
MIN
500
170
340
15
35
50
20
85
40
23
-7
1.27
TYP
900
200
400
115
150
0.1
0.8
0.5
25
50
50
50
92
60
30
0
0
IRU3072
0.816
MAX
1300
230
460
100
100
150
100
35
75
99
37
+7
1
2
UNITS
mmho
KHz
V
mA
mV
mA
mA
mA
mA
mA
ns
ns
8C
ns
ns
%
%
V
PP
3