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IRU3048CSTR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
IRU3048
1
Rev. 1.7
09/12/02
www.irf.com
TYPICAL APPLICATION
DESCRIPTION
The IRU3048 IC combines a Dual synchronous Buck
controller and a linear regulator controller, providing a
cost-effective, high performance and flexible solution for
multi-output applications. The Dual synchronous con-
troller is configured as 2-independent PWM controller.
IRU3048 provides a separate adjustable output by driv-
ing a switch as a linear regulator. This device features an
internal 200KHz oscillator, under-voltage lockout for all
input supplies, an external programmable soft start func-
tion as well as output under-voltage detection that latches
off the device when an output short is detected.
Dual Synchronous Controller in 16-Pin Package
with 1808 out-of-phase operation
LDO Controller with 40mA drive
Configured as 2-Independent PWM Controller
Flexible, Same or Separate Supply Operation
Operation from 4V to 25V Input
Internal 200KHz Oscillator
Soft-Start controls all outputs
Fixed Frequency Voltage Mode
500mA Peak Output Drive Capability
Programmable Outputs
PACKAGE ORDER INFORMATION
FEATURES
DUAL SYNCHRONOUS PWM CONTROLLER
CIRCUITRY AND LDO CONTROLLER
APPLICATIONS
TA (°C) DEVICE PACKAGE
0 To 70 IRU3048CF 16-Pin TSSOP (F)
0 To 70 IRU3048CS 16-Pin SOIC NB (S)
PRELIMINARY DATA SHEET
Data Sheet No.PD94253
Figure 1 - Typical application of IRU3048 configured as 2-independent converter.
DDR Memory Source Sink Vtt Application
Graphic Card
Hard Disk Drive
Power supplies requiring multiple outputs
12V
5V
VOUT3
C1
R2
Q5
L2
Q4
Q1
C2
3.3V
U1
VOUT1
R6
L1
R5
C5
R1
R4
C4
R3
C3
PGnd
VOUT3
LDrv1
HDrv1
Fb1
Fb2
LDrv2
HDrv2
VcH1 VcH2
Vcc
Gnd
Comp2
Fb3
Comp1
SS
IRU3048
Q3
Q2
VOUT2
C6
R7 C7
R8
2
Rev. 1.7
09/12/02
IRU3048
www.irf.com
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Vcc=5V, VcH1=VcH2=12V, 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.
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage .................................................. 25V
VcH1=VcH2 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
16-PIN PLASTIC TSSOP (F) 16-PIN PLASTIC SOIC NB (S)
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 - VcH1
UVLO Hysteresis - VcH1
UVLO Threshold - VcH2
UVLO Hysteresis - VcH2
UVLO Threshold - Fb
UVLO Hysteresis - Fb
Supply Current
Vcc Dynamic Supply Current
VcH1 Dynamic Supply Current
VcH2 Dynamic Supply Current
Vcc Static Supply Current
VcH1 Static Supply Current
VcH2 Static Supply Current
Soft-Start Section
Charge Current
5<Vcc<12
Supply Ramping Up
Supply Ramping Up
Supply Ramping Up
Fb Ramping Down
Freq=200KHz, CL=1500pF
Freq=200KHz, CL=1500pF
Freq=200KHz, CL=1500pF
SS=0V
SS=0V
SS=0V
SS=0V
1.225
15
1.250
0.2
4.2
0.25
3.5
0.2
3.5
0.2
0.6
0.1
5
7
7
3.5
2
2
25
1.275
30
V
%
V
V
V
V
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
uJA=858C/W
uJA=908C/W
Comp1
Comp2
VcH2
HDrv2
LDrv2
Fb2
PGnd Vcc
LDrv1
HDrv1
VcH1
V
OUT3
Fb3
SS
Fb1Gnd
4
3
2
1
13
14
15
16
8
7
6
5
9
10
11
12
TOP VIEW
VFB
LREG
UVLOVCC
UVLOVCH1
UVLOVCH2
UVLOFB
Dyn ICC
Dyn ICH1
Dyn ICH2
ICCQ
ICH1Q
ICH2Q
SSIB
Comp1
Comp2
VcH2
HDrv2
LDrv2
Fb2
PGnd Vcc
LDrv1
HDrv1
VcH1
V
OUT3
Fb3
SS
Fb1Gnd
4
3
2
1
13
14
15
16
8
7
6
5
9
10
11
12
TOP VIEW
IRU3048
3
Rev. 1.7
09/12/02
www.irf.com
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
PIN DESCRIPTIONS
PIN# PIN SYMBOL PIN DESCRIPTION
Error Amp
Fb Voltage Input Bias Current
Fb Voltage Input Bias Current
Transconductance 1
Transconductance 2
Oscillator
Frequency
Ramp Amplitude
Output Drivers
Rise Time
Fall Time
Dead Band Time
Max Duty Cycle
Min Duty Cycle
LDO Controller
Drive Current
Fb Voltage
Input Bias Current
SS=3V
SS=0V
CL=1500pF
CL=1500pF
Fb=1V, Freq=200KHz
Fb=1.5V
180
50
85
0
30
1.225
-0.1
-64
400
600
200
1.25
35
50
150
90
0
45
1.25
0.5
220
100
100
250
1.275
2
mA
mA
mmho
mmho
KHz
VPP
ns
ns
ns
%
%
mA
V
mA
1
2
16
3
4
5
12
6
11
7
10
8
9
13
14
15
Gnd
Fb2
Fb1
Comp1
Comp2
VcH2
VcH1
HDrv2
HDrv1
LDrv2
LDrv1
PGnd
Vcc
VOUT3
Fb3
SS
Ground pin.
Inverting inputs to the error amplifiers. These pins work as feedback inputs for each
channel, and are connected directly to the output of the switching regulator via a resistor
divider to set the output voltages.
Compensation pins for the error amplifiers.
Supply voltage for the high side output drivers. These are connected to voltages that
must be at least 4V higher than their bus voltages (assuming 5V threshold MOSFET). A
minimum of 1mF high frequency capacitor must be connected from these pins to PGnd
pin to provide peak drive current capability.
Output driver for the high side power MOSFET. Connect a diode, such as BAT54 or
1N4148, from these pins 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.
Output driver for the synchronous power MOSFET.
This pin serves as the separate ground for MOSFET’s driver and should be connected to
the system’s ground plane.
Supply voltage for the internal blocks of the IC.
Driver signal for the LDO’s external transistor.
LDO’s feedback pin, connected to a resistor divider to set the output voltage of LDO.
Soft-Start pin. The converter can be shutdown by pulling this pin below 0.5V.
IFB1
IFB2
gm1
gm2
Freq
VRAMP
Tr
Tf
TDB
TON
TOFF
ILDO
VFBLDO
ILDO(BIAS)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

IRU3048CSTR

Mfr. #:
Buy IRU3048CSTR
Manufacturer:
Infineon Technologies
Description:
IC REG TRPL BUCK/LNR SYNC 16SOIC
Lifecycle:
New from this manufacturer.
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