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IRU3037ACFTRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
IRU3037/IRU3037A & (PbF)
1
www.irf.com
TYPICAL APPLICATION
DESCRIPTION
The IRU3037 controller IC is designed to provide a low
cost synchronous Buck regulator for on-board DC to DC
converter applications. With the migration of today’s ASIC
products requiring low supply voltages such as 1.8V and
lower, together with currents in excess of 3A, traditional
linear regulators are simply too lossy to be used when
input supply is 5V or even in some cases with 3.3V
input supply. The IRU3037 together with dual N-channel
MOSFETs such as IRF7313, provide a low cost solution
for such applications. This device features an internal
200KHz oscillator (400KHz for "A" version), under-volt-
age lockout for both Vcc and Vc supplies, an external
programmable soft-start function as well as output un-
der-voltage detection that latches off the device when an
output short is detected.
Synchronous Controller in 8-Pin Package
Operating with single 5V or 12V supply voltage
Internal 200KHz Oscillator
(400KHz for IRU3037A)
Soft-Start Function
Fixed Frequency Voltage Mode
500mA Peak Output Drive Capability
Protects the output when control FET is shorted
SOIC 8-Lead also available LEAD-FREE
PACKAGE ORDER INFORMATION
FEATURES
8-PIN SYNCHRONOUS PWM CONTROLLER
APPLICATIONS
DDR memory source sink Vtt application
Low cost on-board DC to DC such as 5V to 3.3V,
2.5V or 1.8V
Graphic Card
Hard Disk Drive
Data Sheet No. PD94173 revD
Figure 1 - Typical application of IRU3037 or IRU3037A.
IRU3037
U1
Vcc Vc
HDrv
LDrv
Fb
Gnd
Comp
SS/SD
C3
1uF
C4
1uF
C8
0.1uF
C9
2200pF
R4
24k
Q1
1/2 of IRF7313
Q2
1/2 of IRF7313
R5
1.24K, 1%
R3
249, 1%
L2
D05022P-562, 5.6uH, 5.3A
L1
1uH
C2
10TPB100M,
100uF, 55m
Ω
C1
47uF
1.5V/5A
C7
2x 6TPC150M,
150uF, 40m
Ω
12V
5V
TA (°C) DEVICE LEADFREE DEVICE PACKAGE FREQUENCY
0 To 70 IRU3037CF IRU3037CFPbF 8-Pin Plastic TSSOP (F) 200KHz
0 To 70 IRU3037CS IRU3037CSPbF 8-Pin Plastic SOIC NB (S) 200KHz
0 To 70 IRU3037ACF IRU3037ACFPbF 8-Pin Plastic TSSOP (F) 400KHz
0 To 70 IRU3037ACS IRU3037ACSPbF 8-Pin Plastic SOIC NB (S) 400KHz
2
IRU3037/IRU3037A & (PbF)
www.irf.com
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage .................................................. 25V
Vc Supply Voltage ...................................................... 30V (not rated for inductive load)
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 125°C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage
Fb Voltage
Fb Voltage Line Regulation
UVLO
UVLO Threshold - Vcc
UVLO Hysteresis - Vcc
UVLO Threshold - Vc
UVLO Hysteresis - Vc
UVLO Threshold - Fb
UVLO Hysteresis - Fb
Supply Current
Vcc Dynamic Supply Current
Vc Dynamic Supply Current
Vcc Static Supply Current
Vc Static Supply Current
Soft-Start Section
Charge Current
IRU3037
IRU3037A
5<Vcc<12
Supply Ramping Up
Supply Ramping Up
Fb Ramping Down (IRU3037)
(IRU3037A)
Freq=200KHz, CL=1500pF
Freq=200KHz, CL=1500pF
SS=0V
SS=0V
SS=0V
1.225
0.784
4.0
3.1
0.4
0.3
2
2
1
0.5
-10
1.250
0.800
0.2
4.2
0.25
3.3
0.2
0.6
0.4
0.1
5
7
3.3
1
-20
1.275
0.816
0.35
4.4
3.5
0.8
0.5
8
10
6
4.5
-30
V
%
V
V
V
V
V
V
mA
mA
mA
mA
µA
VFB
LREG
UVLO Vcc
UVLO Vc
UVLO Fb
Dyn Icc
Dyn Ic
ICCQ
ICQ
SSIB
θJA=160°C/W
(Also available LEAD-FREE)
θJA=124°C/W
Fb
Vcc
LDrv
Gnd HDrv
Vc
Comp
SS/SD
4
3
2
1
5
6
7
8
Fb
Vcc
LDrv
Gnd
SS/SD
Comp
Vc
HDrv
4
3
2
1
5
6
7
8
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Vcc=5V, Vc=12V and TA=0 to 70°C. Typical values refer
to TA=25°C. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient
temperature.
PACKAGE INFORMATION
8-PIN PLASTIC TSSOP (F) 8-PIN PLASTIC SOIC (S)
IRU3037/IRU3037A & (PbF)
3
www.irf.com
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
PIN DESCRIPTIONS
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.
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
SS=3V, Fb=1V
SS=0V, Fb=1V
IRU3037
IRU3037A
CL=1500pF
C
L=1500pF
Fb=1V, Freq=200KHz
Fb=1.5V
410
180
345
1.225
50
85
0
-0.1
-64
600
200
400
1.25
50
50
150
90
0
830
220
440
1.275
100
100
250
95
µA
µA
µmho
KHz
V
ns
ns
ns
%
%
PIN# PIN SYMBOL PIN DESCRIPTION
1
2
3
4
5
6
7
8
Fb
Vcc
LDrv
Gnd
HDrv
Vc
Comp
SS / SD
IFB1
IFB2
gm
Freq
V
RAMP
Tr
Tf
TDB
TON
TOFF
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

IRU3037ACFTRPBF

Mfr. #:
Buy IRU3037ACFTRPBF
Manufacturer:
Infineon Technologies
Description:
Switching Controllers 8 PWM 200 KHZ 500mA Synch CTRL
Lifecycle:
New from this manufacturer.
Delivery:
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