IRU3038CF International Rectifier, IRU3038CF Datasheet

IC CTRL SYNCH PWM 14-PIN TSSOP

IRU3038CF

Manufacturer Part Number
IRU3038CF
Description
IC CTRL SYNCH PWM 14-PIN TSSOP
Manufacturer
International Rectifier
Datasheet

Specifications of IRU3038CF

Pwm Type
Voltage Mode
Number Of Outputs
1
Frequency - Max
440kHz
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
14-TSSOP
Frequency-max
440kHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*IRU3038CF

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
IRU3038CF
Manufacturer:
IR
Quantity:
20 000
FEATURES
APPLICATIONS
TYPICAL APPLICATION
PACKAGE ORDER INFORMATION
Rev. 2.0
09/12/02
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
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
Memory
(2.5V)
DDR
V
DDQ
R1
1K
R2
1K
2200pF
0.1uF
C5
C7
33K
R3
0.1uF
Figure 1 - Typical application of IRU3038 when Vtt tracks the V
FOR TERMINATION POWER SUPPLY APPLICATIONS
C1
0 To 70
0 To 70
T
A
V
V
SS
Rt
Comp
REF
P
(°C)
IRU3038
Vcc
Gnd
U1
IRU3038CF
IRU3038CS
Vc
PGnd
HDrv
LDrv
DEVICE
Fb
SYNCHRONOUS PWM CONTROLLER
12V
C2
1uF
D1
BAT54
or 1N4148
www.irf.com
DESCRIPTION
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.
14-Pin Plastic TSSOP (F)
14-Pin Plastic SOIC NB (S)
Q2
1/2 of IRF7313
Q1
1/2 of IRF7313
PACKAGE
D03316P-103, 10uH, 3.9A
C3
10TPB100M,
100uF, 55m
L2
V
1uH
L1
PRELIMINARY DATA SHEET
DDQ
Data Sheet No. PD94250
.
C4
47uF
C6
2x 6TPB150M,
150uF, 55m
IRU3038
5V
Vtt
1.25V @ 3A
V
1

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IRU3038CF Summary of contents

Page 1

... Vc Q1 HDrv 1/2 of IRF7313 D1 BAT54 U1 or 1N4148 D03316P-103, 10uH, 3.9A Q2 LDrv 1/2 of IRF7313 PGnd Fb Gnd DEVICE PACKAGE IRU3038CF 14-Pin Plastic TSSOP (F) IRU3038CS 14-Pin Plastic SOIC NB (S) www.irf.com Data Sheet No. PD94250 IRU3038 PRELIMINARY DATA SHEET 5V L1 1uH C4 47uF V L2 Vtt 1.25V @ 3A C6 ...

Page 2

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 ..................... PACKAGE INFORMATION 14-PIN PLASTIC TSSOP ( ...

Page 3

PARAMETER SYM Error Amp Fb Voltage Input Bias Current I FB1 Fb Voltage Input Bias Current I FB2 V Voltage Range P Transconductance g Oscillator Frequency Freq Ramp Amplitude V RAMP Output Drivers Rise Time T Fall Time T Dead ...

Page 4

IRU3038 BLOCK DIAGRAM 1.25V 3. ...

Page 5

APPLICATION INFORMATION Design Example: The following example is a typical application for IRU3038, the schematic is Figure 11 on page 12 2.5V OUT OUT DV = 100mV OUT f = 200KHz ...

Page 6

IRU3038 Output Capacitor Selection The criteria to select the output capacitor is normally based on the value of the Effective Series Resistance (ESR). In general, the output capacitor must have low enough ESR to meet output ripple and load transient ...

Page 7

The MOSFET has the following data: IRF7460 V = 20V DSS I = 10A @ 758C 10mV @ V =10V DS(ON 1.8 for 1508C (Junction Temperature) The total conduction losses will be ...

Page 8

IRU3038 Note that this method requires that the output capacitor should have enough ESR to satisfy stability requirements. In general, the output capacitor’s ESR generates a zero typically at 5KHz to 50KHz which is essential for an acceptable phase margin. ...

Page 9

For a general solution for unconditionally stability for ceramic capacitor with very low ESR and any type of output capacitors wide range of ESR values we should implement local feedback with a compensation network. The typically used compensation ...

Page 10

IRU3038 6) Place second pole at the ESR zero ESR Check if R > too small, increase R ...

Page 11

TYPICAL PERFORMANCE CHARACTERISTICS IRU3038 Output Voltage 1.3 1.28 Max 1.26 1.24 Min 1.22 1.2 -40°C -25°C 0°C +25°C +50°C +75°C +100°C +125°C +150°C Output Voltage Spec Max. Figure 8 - Output voltage of IRU3038 ...

Page 12

IRU3038 TYPICAL APPLICATION Single Supply 5V Input C4 C3 1uF 0.1uF Vcc Vc V REF HDrv IRU3038 C8 LDrv 0.1uF PGnd Rt Fb Comp C9 Gnd 1800pF R4 26.1K Figure 11 - Typical application of IRU3038 ...

Page 13

TYPICAL APPLICATION 5V C1 0.1uF Vcc Vc HDrv SS C6 0.1uF U1 IRU3037 LDrv Comp C8 Fb 2200pF Gnd R2 33K 5V C9 0.1uF Vcc HDrv IRU3038 ...

Page 14

IRU3038 DEMO-BOARD APPLICATION REF C3 1uF R12 Vcc Short V REF R13 R2 Open Short V V DDQ P R1 IRU3038 SS Open C8 0.1uF Rt Comp C15 Gnd 1800pF R9 26.1K Figure 14 ...

Page 15

TYPICAL PERFORMANCE CHARACTERISTICS Output Current (A) Figure 15 - Efficiency for IRU3038 Evaluation Board. V =5V, V =2.5V IN OUT Vss V OUT I OUT Figure ...

Page 16

IRU3038 A 1.0 DIA E PIN NUMBER NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. 16 (F) TSSOP Package 14-Pin SYMBOL 14-PIN DESIG MIN NOM MAX 0.65 BSC A B 4.30 4.40 ...

Page 17

Surface Mount, Narrow Body PIN NO. 1 NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. Rev. 2.0 09/12/02 (S) SOIC Package E DETAIL-A D 0.386 0.015 x 458 14-PIN SYMBOL MIN MAX A 8.56 ...

Page 18

IRU3038 PACKAGE SHIPMENT METHOD PKG PACKAGE DESIG DESCRIPTION F TSSOP Plastic S SOIC, Narrow Body 1 1 Feed Direction Figure A IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 18 PIN PARTS COUNT PER ...

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