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PDF IR3475 Data sheet ( Hoja de datos )
| Número de pieza | IR3475 | |
| Descripción | 10A Highly Integrated SupIRBuck | |
| Fabricantes | International Rectifier | |
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Hay una vista previa y un enlace de descarga de IR3475 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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10A Highly Integrated SupIRBuckTM IR3475
FEATURES
• Input Voltage Range: 3V to 27V
• Output Voltage Range: 0.5V to 12V
• Continuous 10A Load Capability
• Constant On‐Time Control
• Compensation Loop not Required
• Excellent Efficiency at Very Low Output Currents
• Programmable Switching Frequency and Soft Start
• Thermally Compensated Over Current Protection
• Power Good Output
• Precision Voltage Reference (0.5V, +/‐1%)
• Enable Input with Voltage Monitoring Capability
• Pre‐bias Start Up
• Thermal Shut Down
• Under/Over Voltage Fault Protection
• Forced Continuous Conduction Mode Option
• Very Small, Low Profile 4mm x 5mm QFN Package
BASIC APPLICATION
DESCRIPTION
The IR3475 SupIRBuckTM is an easy‐to‐use, fully integrated
and highly efficient DC/DC voltage regulator. The onboard
constant on time hysteretic controller and MOSFETs make
IR3475 a space‐efficient solution that delivers up to 10A of
precisely controlled output voltage.
Programmable switching frequency, soft start, and
thermally compensated over current protection allows for
a very flexible solution suitable for many different
applications and an ideal choice for battery powered
applications.
Additional features include pre‐bias startup, very precise
0.5V reference, under/over voltage shutdown, thermal
protection, power good output, and enable input with
voltage monitoring capability.
APPLICATIONS
• Notebook and Desktop Computers
• Consumer Electronics – STB, LCD, TV, Printers
• 12V and 24V Distributed Power Systems
• General Purpose POL DC‐DC Converters
• Game Consoles and Graphics Cards
EFFICIENCY
Figure 1: IR3475 Basic Application Circuit
95%
90%
85%
80%
75%
70%
65%
60%
55%
50%
45%
0.01
VIN = 19V
VIN = 12V
VIN = 8V
0.1 1
Load Current (A)
Figure 2: IR3475 Efficiency
10
1 March 27, 2013 | V2.2 | PD97602
Free Datasheet http://www.datasheet4u.com/
1 page  
10A Highly Integrated SupIRBuckTM IR3475
PIN DESCRIPTIONS
PIN #
1
2
3
4, 17
5
6
7
8
9
10
11
12
13
14
15
16
PIN NAME
FCCM
ISET
PGOOD
GND
FB
SS
NC
3VCBP
NC
VCC
PGND
PHASE
VIN
BOOT
FF
EN
I/O LEVEL
PIN DESCRIPTION
3.3V
5V
Reference
3.3V
3.3V
‐
3.3V
‐
5V
Reference
VIN
VIN
VIN + VCC
VIN
5V
Forced Continuous Conduction Mode (CCM). Ground this pin to enable diode
emulation mode or discontinuous conduction mode (DCM). Pull this pin to 3.3V
to operate in CCM under all load conditions.
Connecting resistor to PHASE pin sets over current trip point.
Power good open drain output – pull up with a resistor to 3.3V
Bias return and signal reference.
Inverting input to PWM comparator, OVP / PGOOD sense.
Soft start/shutdown. This pin provides user programmable soft‐start function.
Connect an external capacitor from this pin to GND to set the startup time of the
output voltage. The converter can be shutdown by pulling this pin below 0.3V.
‐
For internal LDO. Bypass with a 1.0µF capacitor to AGND. A resistor in series with
the bypass capacitor may be required in single‐ground plane designs. Refer to
Layout Recommendation for details.
‐
VCC input. Gate drive supply. A minimum of 1.0µF ceramic capacitor is required.
Power return.
Phase node (or switching node) of MOSFET half bridge.
Input voltage for the system.
Bootstrapped gate drive supply – connect a capacitor to PHASE.
Input voltage feed forward – sets on‐time with a resistor to VIN.
Enable pin to turn on and off the device. Use two external resistors to set the
turn on threshold (see Electrical Specifications) for input voltage monitoring.
5 March 27, 2013 | V2.2 | PD97602
Free Datasheet http://www.datasheet4u.com/
5 Page 
10A Highly Integrated SupIRBuckTM IR3475
TYPICAL OPERATING DATA
Tested with demoboard shown in Figure 4, VIN = 12V, VCC = 5V, VOUT = 1.05V, Fs = 300kHz, TA = 25oC, no airflow, unless
otherwise specified.
VOUT
VOUT
PHASE
PHASE
iL iL
20mV/div 5V/div 2A/div
50µs/div
20mV/div 5V/div 5A/div
50µs/div
Figure 17: Load Transient 0‐4A
Figure 18: Load Transient 6‐10A
FCCM
PHASE
FCCM
PHASE
VOUT
iL
VOUT
iL
5V/div 10V/div 500mV/div 5A/div
10µs/div
Figure 19: DCM/FCCM Transition
2V/div 10V/div 500mV/div 5A/div
5µs/div
Figure 20: FCCM/DCM Transition
Figure 21: Thermal Image at VIN = 12V, IOUT = 10A
(IR3475: 95oC, Inductor: 57oC, PCB: 44oC)
11 March 27, 2013 | V2.2 | PD97602
Figure 22: Thermal Image at VIN = 19V, IOUT = 10A
(IR3475: 97oC, Inductor: 58oC, PCB: 44oC)
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet IR3475.PDF ] | |
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