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PDF IR3897 Data sheet ( Hoja de datos )
| Número de pieza | IR3897 | |
| Descripción | 4A HIGHLY INTERGRATED SUPLRBUCK | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IR3897 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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4A Highly Integrated SupIRBuckTM
Single‐Input Vo- l1ta-ge, Synchronous Buck Regulator
PD‐97663
IR3897
FEATURES
Single 5V to 21V application
Wide Input Voltage Range from 1.0V to 21V with
external Vcc
Output Voltage Range: 0.5V to 0.86* Vin
DESCRIPTION
The IR3897 SupIRBuckTM is an easy‐to‐use, fully
integrated and highly efficient DC/DC regulator.
The onboard PWM controller and MOSFETs make
IR3897 a space‐efficient solution, providing accurate
power delivery.
Enhanced Line/Load Regulation with Feed‐Forward
Programmable Switching Frequency up to 1.5MHz
Internal Digital Soft‐Start/Soft‐Stop
Enable input with Voltage Monitoring Capability
Thermally Compensated Current Limit with robust
hiccup mode over current protection
IR3897 is a versatile regulator which offers
programmability of switching frequency and internal
current limit while operates in wide input and output
voltage range.
The switching frequency is programmable from 300kHz
to 1.5MHz for an optimum solution.
Smart Internal LDO to improve light load and full load
efficiency
External Synchronization with Smooth Clocking
Enhanced Pre‐Bias Start‐Up
Precision Reference Voltage (0.5V+/‐0.5%) with
margining capability
Vp for Tracking Applications (Source/Sink Capability
+/‐4A)
Integrated MOSFET drivers and Bootstrap Diode
Thermal Shut Down
Programmable Power Good Output with tracking
capability
Monotonic Start‐Up
Operating temp: ‐40oC < Tj < 125oC
It also features important protection functions, such as
Pre‐Bias startup, thermally compensated current limit,
over voltage protection and thermal shutdown to give
required system level security in the event of fault
conditions.
APPLICATIONS
Netcom Applications
www.DataSheet.net/
Embedded Telecom Systems
Server Applications
Storage Applications
Distributed Point of Load Power Architectures
Small Size: 4mm x 5mm PQFN
Lead‐free, Halogen‐free and RoHS Compliant
BASIC APPLICATION
97
95
93
91
89
87
85
83
81
* 79
*
77
75 12Vin,Internal bias,Frequency 600KHz
73
0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4
Load Current (A)
* optional
1.2Vout 3.3Vout
Figure 1: IR3897 Basic Application Circuit F igure 2:IR3897 Efficiency
1 AUGUST 08, 2012 |DATA SHEET | Rev 3.3
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
4A Highly Integrated SupIRBuckTM
Single‐Input Vo- l5ta-ge, Synchronous Buck Regulator
PD‐97663
IR3897
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications are not implied.
PVin, Vin
‐0.3V to 25V
Vcc/LDO_Out
‐0.3V to 8V (Note 2)
Boot
‐0.3V to 33V
SW ‐0.3V to 25V (DC), ‐4V to 25V (AC, 100ns)
Boot to SW
‐0.3V to VCC + 0.3V (Note 1)
S_Ctrl, PGood
‐0.3V to VCC + 0.3V (Note 1)
Other Input/Output Pins
‐0.3V to +3.9V
PGnd to Gnd
‐0.3V to +0.3V
Storage Temperature Range
‐55°C to 150°C
Junction Temperature Range
‐40°C to 150°C (Note 2)
ESD Classification (HBM JESD22‐A114)
2kV
Moisture Sensitivity Level
JEDEC Level 2@260°C
Note 1: Must not exceed 8V
Note 2: Vcc must not exceed 7.5V for Junction Temperature between ‐10°C and ‐40°C
www.DataSheet.net/
5 AUGUST 08, 2012 |DATA SHEET | Rev 3.3
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
4A Highly Integrated SupIRBuckTM
Single‐Input V-o1lt1a-ge, Synchronous Buck Regulator
PD‐97663
IR3897
TYPICAL EFFICIENCY AND POWER LOSS CURVES
PVin = 12V, Vcc = External 5V, Io = 0A‐4A, Fs = 600KHz, Room Temperature, No Air Flow. Note that the efficiency and power
loss curves include the losses of IR3897, the inductor losses and the losses of the input and output capacitors. The table
below shows the inductors used for each of the output voltages in the efficiency measurement.
VOUT (V)
LOUT (µH)
P/N
DCR (mΩ)
1.0
1.5 PCMB065T-1R5MS (Cyntec)
6.7
1.2
1.5 PCMB065T-1R5MS (Cyntec)
6.7
1.8
2.2 7443340220 (Wurth Elektronik)
4.4
3.3
3.3 7443340330 (Wurth Elektronik)
6.5
5
3.3 7443340330 (Wurth Elektronik)
6.5
98
96
94
92
90
88
86
84
www.DataSheet.net/
82
80
0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4
Load Current (A)
1.0V 1.2V 1.8V 3.3V 5.0V
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4
Load Current (A)
1.0V 1.2V 1.8V 3.3V 5.0V
11 AUGUST 08, 2012 |DATA SHEET | Rev 3.3
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet IR3897.PDF ] | |
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