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IR3447のメーカーはInfineonです、この部品の機能は「Synchronous Buck Regulator」です。 |
部品番号 | IR3447 |
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部品説明 | Synchronous Buck Regulator | ||
メーカ | Infineon | ||
ロゴ | |||
このページの下部にプレビューとIR3447ダウンロード(pdfファイル)リンクがあります。 Total 30 pages
25A Highly Integrated SupIRBuck®
Single-Input Voltage, Synchronous
Buck Regulator
DCDC Converter
SupIRBuck
IR3447
FEATURES
• Single 5V to 21V application
• Wide Input Voltage Range from 1.5V to 21V with
external Vcc
• Output Voltage Range: 0.6V to 0.86*PVin
• 0.5% accurate Reference Voltage
• Enhanced line/load regulation with Feed-Forward
• Programmable Switching Frequency up to 1.5MHz
• Internal Digital Soft-Start
• Enable input with Voltage Monitoring Capability
• Remote Sense Amplifier with True Differential
Voltage Sensing
• Thermally compensated current limit and Hiccup
Mode Over Current Protection
• Smart LDO to enhance efficiency
• External synchronization with Smooth Clocking
• Dedicated output voltage sensing for power good
indication and overvoltage protection which
remains active even when Enable is low.
• Enhanced Pre-Bias Start up
• Body Braking to improve transient
• Integrated MOSFET drivers and Bootstrap diode
• Thermal Shut Down
• Post Package trimmed rising edge dead-time
• Programmable Power Good Output
• Small Size 5mm x 6mm PQFN
• Operating Junction Temp: -40oC<Tj<125oC
• Lead-free, Halogen-free and RoHS Compliant
DESCRIPTION
The IR3447 SupIRBuck® is an easy-to-use, fully
integrated and highly efficient DC/DC regulator. The
onboard PWM controller and MOSFETs make IR3447
a space-efficient solution, providing accurate power
delivery for low output voltage and high current
applications.
IR3447 is a versatile regulator which offers
programmability of switching frequency and current
limit while operating in wide input and output voltage
range.
The switching frequency is programmable from 300
kHz to 1.5MHz for an optimum solution.
It also features important protection functions, such as
Over Voltage Protection (OVP), Pre-Bias startup,
hiccup current limit and thermal shutdown to give
required system level security in the event of fault
conditions.
APPLICATIONS
• Server Application
• Distributed Point of Load Power Architectures
• Set Top Box Application
• Power Supplies
ORDERING INFORMATION
Base Part
Number
Package Type
IR3447
PQFN 5mm x 6mm
Standard Pack
Form
Quantity
Tape and Reel
4000
Orderable Part
Number
IR3447MTRPBF
1 Rev 3.7
May 17, 2016
1 Page FUNCTIONAL BLOCK DIAGRAM
IR3447
Vin
LGnd
Comp
CByp
FB
Vsns
Enable
Smart
LDO
DCM
VCC
THERMAL
SHUTDOWN
TSD
VREF
0.6V
FB
UVcc UVcc
+
+ E/A
-
VREF
UVcc
OVER
VOLTAGE
OC
FAULT
CONTROL
POR
OV
FAULT
DRIVER
HDrv
POR +
Intl_SS
POR
FAULT
DIGITAL
SOFT
START
PVin
SSOK
HDin
LDin
CLK
BODY
BRAKING
CONTROL
LDrv
UVEN
UVEN
CONTROL
ZC ZERO CROSSING
COMPARATOR
UVcc
POR POR
LOGIC
OC OVER CURRENT
RS- - VREF
RS+ + FB
DCM
RSo Rt/Sync PGD
Figure 3: IR3447 Simplified Block Diagram
VCC/
LDO_out
Boot
PVin
SW
PGnd
OCset
3 Rev 3.7
May 17, 2016
3Pages IR3447
ELECTRICAL SPECIFICATIONS
RECOMMENDED OPERATING CONDITIONS
SYMBOL
DEFINITION
MIN
PVin
Input Bus Voltage *
1.5
Vin Supply Voltage
5.0
VCC
Supply Voltage **
4.5
Boot to SW
Supply Voltage
4.5
VO Output Voltage
IO Output Current
Fs Switching Frequency
0.6
0
300
TJ Junction Temperature
-40
* SW node must not exceed 25V
** When VCC is connected to an externally regulated supply, also connect Vin.
MAX
21
21
7.5
7.5
0.86 * PVin
±25
1500
125
UNITS
V
A
kHz
°C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specification apply over, 1.5V < PVin < 21V, 4.5V< VCC < 7.5V, 0oC < TJ <
125oC.
Typical values are specified at TA = 25oC.
PARAMETER
Power Loss
SYMBOL
CONDITIONS
MIN TYP MAX UNIT
Power Loss
MOSFET Rds(on)
Top Switch
Bottom Switch
PLOSS
Rds(on)_Top
Rds(on)_Bot
Vin = PVin = 12V, VO =
1.2V, IO = 25A, Fs =
600kHz, L=0.215uH,
TA = 25°C, Note 4
VBoot – VSW = 6.8V,
ID = 25A, Tj = 25°C
VCC =6.8V, ID = 25A,
Tj = 25°C
3.62 W
4 5.2
mΩ
1.8 2.3
Reference Voltage
Feedback Voltage
Accuracy
VFB 0.6 V
Vref=0.6V,
0°C < Tj < 105°C
Vref=0.6V,
-40°C < Tj < 125°C
-0.5
-1.0
+0.5
%
+1.0
Supply Current
Vin Supply Current
(Standby)
Iin(Standby)
Vin=21V, Enable low,
No Switching
300 425 µA
Vin Supply Current (Dyn)
Iin(Dyn)
Vin=21V, Enable high,
Fs = 600kHz
40 mA
6 Rev 3.7
May 17, 2016
6 Page | |||
ページ | 合計 : 30 ページ | ||
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PDF ダウンロード | [ IR3447 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
IR3447 | Synchronous Buck Regulator | International Rectifier |
IR3447 | Synchronous Buck Regulator | Infineon |
IR3448 | Synchronous Buck Regulator | International Rectifier |
IR3448 | Synchronous Buck Regulator | Infineon |