IRU3037CS International Rectifier, IRU3037CS Datasheet - Page 3

• Manufacturer Part Number: IRU3037CS
• Description: IC CNTRL PWN SYNCHRONOUS 8-SOIC
• Manufacturer: International Rectifier

Specifications of IRU3037CS

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 220kHz
• Duty Cycle: 95%
• Voltage - Supply: 5 V ~ 12 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency-max: 220kHz
• Package: 8-Pin SOIC(NB)
• Circuit: Sync PWM Controller
• Vcc (min): 4.0
• Vcc (max): 25
• Vout (min): 1.25
• Vout (max): Vcc * 0.96
• Iout (a): 16
• Switch Freq (khz): 200kHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *IRU3037CS

PARAMETER
Error Amp
Fb Voltage Input Bias Current
Fb Voltage Input Bias Current
Transconductance
Oscillator
Frequency
Ramp-Amplitude Voltage
Output Drivers
Rise Time
Fall Time
Dead Band Time
Max Duty Cycle
Min Duty Cycle
PIN DESCRIPTIONS
PIN#
1
2
3
4
5
6
7
8
PIN SYMBOL
SS / SD
Comp
HDrv
LDrv
Vcc
Gnd
Fb
Vc
This pin is connected directly to the output of the switching regulator via resistor divider to
provide feedback to the Error amplifier.
This pin provides biasing for the internal blocks of the IC as well as power for the low side
driver. A minimum of 1µF, 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 1µF) must be connected from V5 and V12 pins to this pin
for noise free operation.
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.
This pin is connected to a voltage that must be at least 4V higher than the bus voltage of
the switcher (assuming 5V threshold MOSFET) and powers the high side output driver. A
minimum of 1µF, high frequency capacitor must be connected from this pin to ground to
provide peak drive current capability.
Compensation pin of the error amplifier. An external resistor and capacitor network is
typically connected from this pin to ground to provide loop compensation.
This pin provides soft-start for the switching regulator. An internal current source charges
an external capacitor that is connected from this pin to ground which ramps up the output
of the switching regulator, preventing it from overshooting as well as limiting the input
current. The converter can be shutdown by pulling this pin below 0.5V.
PIN DESCRIPTION
SYM
V
Freq
T
T
T
I
I
g
RAMP
FB1
FB2
T
OFF
T
ON
m
DB
r
f
SS=3V, Fb=1V
SS=0V, Fb=1V
IRU3037
IRU3037A
C
C
Fb=1V, Freq=200KHz
Fb=1.5V
L
L
=1500pF
=1500pF
TEST CONDITION
www.irf.com
IRU3037/IRU3037A & (PbF)
1.225
MIN
410
180
345
50
85
0
TYP
1.25
-0.1
600
200
400
150
-64
50
50
90
0
MAX
1.275
830
220
440
100
100
250
95
UNITS
µmho
KHz
µA
µA
ns
ns
ns
%
%
V
3