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PWM CONTROLLER. IRU3037A Datasheet

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PWM CONTROLLER. IRU3037A Datasheet






IRU3037A CONTROLLER. Datasheet pdf. Equivalent




IRU3037A CONTROLLER. Datasheet pdf. Equivalent





Part

IRU3037A

Description

8-PIN SYNCHRONOUS PWM CONTROLLER



Feature


) m oc .U 4 t eeh S ata D.w w w : t eeh S ata D ( Data Sheet No. PD94173 IRU 3037 / IRU3037A 8-PIN SYNCHRONOUS PWM C ONTROLLER FEATURES Synchronous Controll er in 8-Pin Package Operating with sing le 5V or 12V supply voltage Internal 20 0KHz Oscillator (400KHz for IRU3037A) S oft-Start Function Fixed Frequency Volt age Mode 500mA Peak Output Drive Capabi lity Protects the .
Manufacture

International Rectifier

Datasheet
Download IRU3037A Datasheet


International Rectifier IRU3037A

IRU3037A; output when control FET is shorted DESC RIPTION The IRU3037 controller IC is de signed to provide a low cost synchronou s Buck regulator for on-board DC to DC converter applications. With the migrat ion of today’s ASIC products requirin g low supply voltages such as 1.8V and lower, together with currents in excess of 3A, traditional linear regulators a re simply too lossy .


International Rectifier IRU3037A

to be used when input supply is 5V or ev en in some cases with 3.3V input supply . The IRU3037 together with dual N-chan nel MOSFETs such as IRF7313, provide a low cost solution for such applications . This device features an internal 200K Hz oscillator (400KHz for "A" version), under-voltage lockout for both Vcc and Vc supplies, an external programmable soft-start functio.


International Rectifier IRU3037A

n as well as output under-voltage detect ion that latches off the device when an output short is detected. APPLICATION S DDR memory source sink Vtt applicatio n Low cost on-board DC to DC such as 5V to 3.3V, 2.5V or 1.8V Graphic Card Har d Disk Drive TYPICAL APPLICATION 5V 12 V C3 1uF C4 1uF C2 10TPB100M, 100uF, 55 mV L1 1uH C1 47uF Vcc Vc HDrv Q1 1/2 of IRF7313 L2 1.5V.

Part

IRU3037A

Description

8-PIN SYNCHRONOUS PWM CONTROLLER



Feature


) m oc .U 4 t eeh S ata D.w w w : t eeh S ata D ( Data Sheet No. PD94173 IRU 3037 / IRU3037A 8-PIN SYNCHRONOUS PWM C ONTROLLER FEATURES Synchronous Controll er in 8-Pin Package Operating with sing le 5V or 12V supply voltage Internal 20 0KHz Oscillator (400KHz for IRU3037A) S oft-Start Function Fixed Frequency Volt age Mode 500mA Peak Output Drive Capabi lity Protects the .
Manufacture

International Rectifier

Datasheet
Download IRU3037A Datasheet




 IRU3037A
) moc .U4 t eehSa t aD.www : t eehSa t aD (
Data Sheet No. PD94173
IRU3037 / IRU3037A
8-PIN SYNCHRONOUS PWM CONTROLLER
FEATURES
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
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
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.
TYPICAL APPLICATION
12V
C3 C4
1uF 1uF
C8
0.1uF
C9
2200pF
R4
24k
Vcc Vc
HDrv
SS/SD U1
IRU3037
LDrv
Comp
Gnd
Fb
C2
10TPB100M,
100uF, 55mV
L1
1uH
Q1
1/2 of IRF7313
L2
D05022P-562, 5.6uH, 5.3A
Q2
1/2 of IRF7313
R5
1.24K, 1%
R3
249, 1%
5V
C1
47uF
1.5V/5A
C7
2x 6TPC150M,
150uF, 40mV
Figure 1 - Typical application of IRU3037 or IRU3037A.
PACKAGE ORDER INFORMATION
TA (°C)
0 To 70
0 To 70
0 To 70
0 To 70
DEVICE
IRU3037CF
IRU3037CS
IRU3037ACF
IRU3037ACS
PACKAGE
8-Pin Plastic TSSOP (F)
8-Pin Plastic SOIC NB (S)
8-Pin Plastic TSSOP (F)
8-Pin Plastic SOIC NB (S)
FREQUENCY
200KHz
200KHz
400KHz
400KHz
Rev. 2.8
03/10/03
www.DataSheet4U.com
www.irf.com
1




 IRU3037A
IRU3037 / IRU3037A
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.
PACKAGE INFORMATION
8-PIN PLASTIC TSSOP (F)
8-PIN PLASTIC SOIC (S)
Fb 1
Vcc 2
LDrv 3
Gnd 4
8 SS/SD
7 Comp
6 Vc
5 HDrv
Fb 1
Vcc 2
LDrv 3
Gnd 4
8 SS/SD
7 Comp
6 Vc
5 HDrv
θJA=124°C/W
θJA=160°C/W
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.
PARAMETER
SYM
TEST CONDITION
Reference Voltage
Fb Voltage
VFB IRU3037
IRU3037A
Fb Voltage Line Regulation
LREG 5<Vcc<12
UVLO
UVLO Threshold - Vcc
UVLO Vcc Supply Ramping Up
UVLO Hysteresis - Vcc
UVLO Threshold - Vc
UVLO Vc Supply Ramping Up
UVLO Hysteresis - Vc
UVLO Threshold - Fb
UVLO Fb Fb Ramping Down (IRU3037)
(IRU3037A)
UVLO Hysteresis - Fb
Supply Current
Vcc Dynamic Supply Current Dyn Icc Freq=200KHz, CL=1500pF
Vc Dynamic Supply Current Dyn Ic Freq=200KHz, CL=1500pF
Vcc Static Supply Current
ICCQ SS=0V
Vc Static Supply Current
ICQ SS=0V
Soft-Start Section
Charge Current
SSIB SS=0V
MIN
1.225
0.784
4.0
3.1
0.4
0.3
2
2
1
0.5
-10
TYP
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
MAX UNITS
1.275
0.816
0.35
V
%
4.4 V
V
3.5 V
V
0.8 V
0.5
V
8 mA
10 mA
6 mA
4.5 mA
-30 mA
2 www.irf.com
Rev. 2.8
05/10/04




 IRU3037A
IRU3037 / IRU3037A
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
SYM
TEST CONDITION
IFB1 SS=3V, Fb=1V
IFB2 SS=0V, Fb=1V
gm
Freq
V RAMP
IRU3037
IRU3037A
Tr CL=1500pF
Tf CL=1500pF
TDB
TON Fb=1V, Freq=200KHz
TOFF Fb=1.5V
MIN
410
180
345
1.225
50
85
0
TYP
-0.1
-64
600
200
400
1.25
50
50
150
90
0
MAX UNITS
mA
mA
830 mmho
220
440
1.275
KHz
V
100 ns
100 ns
250 ns
95 %
%
PIN DESCRIPTIONS
PIN#
1
PIN SYMBOL PIN DESCRIPTION
Fb This pin is connected directly to the output of the switching regulator via resistor divider to
provide feedback to the Error amplifier.
2 Vcc 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.
3
LDrv
Output driver for the synchronous power MOSFET.
4 Gnd 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 V5 and V12 pins to this pin
for noise free operation.
5
HDrv
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.
6 Vc 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 1mF, high frequency capacitor must be connected from this pin to ground to
provide peak drive current capability.
7
Comp
Compensation pin of the error amplifier. An external resistor and capacitor network is
typically connected from this pin to ground to provide loop compensation.
8 SS / SD 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.
Rev. 2.8
03/10/03
www.irf.com
3






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