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SUPPLY APPLICATIONS. IRU3038 Datasheet

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SUPPLY APPLICATIONS. IRU3038 Datasheet






IRU3038 APPLICATIONS. Datasheet pdf. Equivalent




IRU3038 APPLICATIONS. Datasheet pdf. Equivalent





Part

IRU3038

Description

SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS



Feature


w D w a t S ( : w h D e .e a tS h e e 4 t U c o . ) m Data Sheet No. PD94250 IRU3038 SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS P RELIMINARY DATA SHEET FEATURES Synchro nous Controller in 14-Pin Package Opera ting with single 5V or 12V supply volta ge 200KHz to 400KHz operation set by an external resistor Soft-Start Function Fixed Frequency Vo.
Manufacture

International Rectifier

Datasheet
Download IRU3038 Datasheet


International Rectifier IRU3038

IRU3038; ltage Mode 500mA Peak Output Drive Capab ility Uncommitted Error Amplifier avail able for DDR voltage tracking applicati on 1.25V Reference Voltage Protects the output when control FET is shorted DE SCRIPTION The IRU3038 controller IC is designed to provide a low cost synchron ous Buck regulator for voltage tracking applications such DDR memory and gener al purpose on-boar.


International Rectifier IRU3038

d DC to DC converter. Modern micro proce ssors combined with DDR memory, need hi gh-speed bandwidth data bus which requi res a particular bus termination voltag e. This voltage will be tightly regulat ed to track the half of chipset voltage for best performance. The IRU3038 toge ther with dual N-channel MOSFETs such a s IRF7313, provide a low cost solution for such applicati.


International Rectifier IRU3038

ons. This device features a programmable frequency set from 200KHz to 400KHz, u nder-voltage lockout for both Vcc and V c supplies, an external programmable so ft-start function as well as output und er-voltage detection that latches off t he device when an output short is detec ted. APPLICATIONS DDR memory source si nk Vtt application Low cost on-board DC to DC such as 5V .

Part

IRU3038

Description

SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS



Feature


w D w a t S ( : w h D e .e a tS h e e 4 t U c o . ) m Data Sheet No. PD94250 IRU3038 SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS P RELIMINARY DATA SHEET FEATURES Synchro nous Controller in 14-Pin Package Opera ting with single 5V or 12V supply volta ge 200KHz to 400KHz operation set by an external resistor Soft-Start Function Fixed Frequency Vo.
Manufacture

International Rectifier

Datasheet
Download IRU3038 Datasheet




 IRU3038
wDwatS(:whDe.eatShee4tUco.)m
Data Sheet No. PD94250
IRU3038
SYNCHRONOUS PWM CONTROLLER
FOR TERMINATION POWER SUPPLY APPLICATIONS
PRELIMINARY DATA SHEET
FEATURES
DESCRIPTION
Synchronous Controller in 14-Pin Package
Operating with single 5V or 12V supply voltage
200KHz to 400KHz operation set by an external
resistor
Soft-Start Function
Fixed Frequency Voltage Mode
500mA Peak Output Drive Capability
Uncommitted Error Amplifier available for DDR
voltage tracking application
1.25V Reference Voltage
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
The IRU3038 controller IC is designed to provide a low
cost synchronous Buck regulator for voltage tracking
applications such DDR memory and general purpose
on-board DC to DC converter. Modern micro processors
combined with DDR memory, need high-speed bandwidth
data bus which requires a particular bus termination volt-
age. This voltage will be tightly regulated to track the
half of chipset voltage for best performance. The IRU3038
together with dual N-channel MOSFETs such as IRF7313,
provide a low cost solution for such applications. This
device features a programmable frequency set from
200KHz to 400KHz, under-voltage lockout for both Vcc
and Vc supplies, an external programmable soft-start
function as well as output under-voltage detection that
latches off the device when an output short is detected.
TYPICAL APPLICATION
VDDQ
(2.5V)
DDR
Memory
C1
0.1uF
R1
1K
R2
1K C5
0.1uF
C7
2200pF
R3
33K
Vcc
VREF
Vc
HDrv
VP
SS U1
IRU3038
LDrv
Rt
Comp
PGnd
Fb
Gnd
12V
C2
1uF
C3
10TPB100M,
100uF, 55mV
L1
1uH
D1
BAT54
or 1N4148
Q1
1/2 of IRF7313
L2
D03316P-103, 10uH, 3.9A
Q2
1/2 of IRF7313
5V
C4
47uF
Vtt
1.25V @ 3A
C6
2x 6TPB150M,
150uF, 55mV
Figure 1 - Typical application of IRU3038 when Vtt tracks the VDDQ.
PACKAGE ORDER INFORMATION
TA (°C)
0 To 70
0 To 70
DEVICE
IRU3038CF
IRU3038CS
PACKAGE
14-Pin Plastic TSSOP (F)
14-Pin Plastic SOIC NB (S)
Rev. 2.0
09/12/02
www.irf.com
www.DataSheet4U.com
1




 IRU3038
IRU3038
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
PACKAGE INFORMATION
14-PIN PLASTIC TSSOP (F)
14-PIN PLASTIC SOIC (S)
Fb 1
VP 2
VREF 3
Vcc 4
NC 5
LDrv 6
Gnd 7
14 NC
13 SS
12 Comp
11 Rt
10 Vc
9 HDrv
8 PGnd
uJA=1008C/W
Fb 1
VP 2
VREF 3
Vcc 4
NC 5
LDrv 6
Gnd 7
14 NC
13 SS
12 Comp
11 Rt
10 Vc
9 HDrv
8 PGnd
uJA=888C/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
Reference Voltage
VREF 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
SYM
TEST CONDITION
V FB
LREG
5<Vcc<12
UVLO Vcc Supply Ramping Up
UVLO Vc Supply Ramping Up
UVLO Fb Fb Ramping Down
Dyn Icc
Dyn Ic
ICCQ
ICQ
Freq=200KHz, CL=1500pF
Freq=200KHz, CL=1500pF
SS=0V
SS=0V
SSIB SS=0V
MIN
1.225
4
3.1
0.4
2
2
1
0.5
-10
TYP
1.250
0.2
4.2
0.25
3.3
0.2
0.6
0.1
5
7
3.5
1
-20
MAX UNITS
1.275
0.35
V
%
4.4 V
V
3.5 V
V
0.8 V
V
8 mA
10 mA
6 mA
4.5 mA
-30 mA
2 www.irf.com
Rev. 2.0
09/12/02




 IRU3038
IRU3038
PARAMETER
Error Amp
Fb Voltage Input Bias Current
Fb Voltage Input Bias Current
VP Voltage Range
Transconductance
Oscillator
Frequency
Ramp Amplitude
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
Rt=Open
Rt=Gnd
Tr CLOAD=1500pF
Tf CLOAD=1500pF
TDB
TON Fb=1V, Freq=200KHz
TOFF Fb=1.5V
MIN
0.8
450
180
360
1.225
50
85
0
TYP
-0.1
-64
600
200
400
1.25
50
50
150
90
0
MAX UNITS
mA
mA
1.5 V
750 mmho
220
440
1.275
KHz
V
100 ns
100 ns
250 ns
95 %
%
PIN DESCRIPTIONS
PIN#
1
2
3
4
5
14
6
7
8
9
10
11
12
13
PIN SYMBOL
Fb
VP
VREF
Vcc
NC
PIN DESCRIPTION
This pin is connected directly to the output of the switching regulator via resistor divider to
provide feedback to the Error amplifier.
Non-inverting input of error amplifier.
Reference Voltage.
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.
No Connection.
LDrv
Gnd
PGnd
HDrv
Vc
Rt
Comp
SS
Output driver for the synchronous power MOSFET.
Analog ground for internal reference and control circuitry. Connect to PGnd with a short
trace.
This pin serves as the separate ground for MOSFET's drivers and should be connected to
system's ground plane. A high frequency capacitor (0.1 to 1mF) must be connected from
Vcc and Vc 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 1mF, high frequency capacitor must be connected from this pin to ground to
provide peak drive current capability.
The switching frequency can be Programmed between 200KHz and 400KHz by connect-
ing a resistor between Rt and Gnd. Floating the pin set the switching frequency to 200KHz
and grounding the pin set the switching frequency to 400KHz.
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.
Rev. 2.0
09/12/02
www.irf.com
3






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