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PDF IR3847 Data sheet ( Hoja de datos )
| Número de pieza | IR3847 | |
| Descripción | Synchronous Buck Regulator | |
| Fabricantes | International Rectifier | |
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Single-Input Voltage, Synchronous Buck Regulator
25A Highly Integrated SupIRBuckTM
IR3847
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
Vp for tracking applications and sequencing
Vref is available externally to enable margining
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 with tracking
Small Size 5mm x 6mm PQFN
Operating Junction Temp: -40oC<Tj<125oC
Lead-free, Halogen-free and RoHS Compliant
DESCRIPTION
The IR3847 SupIRBuckTM is an easy-to-use, fully
integrated and highly efficient DC/DC regulator. The
onboard PWM controller and MOSFETs make IR3847
a space-efficient solution, providing accurate power
delivery for low output voltage and high current
applications.
IR3847 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
Netcom Applications
Embedded Telecom Systems
Server Application
Distributed Point of Load Power Architectures
Storage Applications
ORDERING INFORMATION
Base Part
Number
Package Type
IR3847
PQFN 5mm x 6mm
IR3847
PQFN 5mm x 6mm
Standard Pack
Form
Quantity
Tape and Reel
750
Tape and Reel
4000
Orderable Part
Number
IR3847MTR1PBF
IR3847MTRPBF
1 www.irf.com © 2013 International Rectifier
May 20, 2013
Free Datasheet http://www.datasheet4u.com/
1 page  
IR3847
PIN DESCRIPTIONS
PIN #
1
2
3
4
5
6
7
8
9
10, 26, 27,
29
11
12
13
14
15
16
17
18
19, 28, 30,
31, 33
20, 21, 22,
23, 24, 25,
32
PIN NAME
PVin
Boot
Enable
Rt/Sync
OCset
Vsns
FB
COMP
RSo
PGND
LGND
RS-
RS+
Vref
Vp
PGD
Vin
VCC/LDO_out
NC
SW
PIN DESCRIPTION
Input voltage for power stage. Bypass capacitors between PVin and
PGND should be connected very close to this pin and PGND; also forms
input to feedforward block
Supply voltage for high side driver
Enable pin to turning on and off the IC.
Use an external resistor from this pin to LGND to set the switching
frequency, very close to the pin. This pin can also be used for external
synchronization.
Current limit setpoint. This pin allows the trip point to be set to one of
three possible settings by either floating this pin, tying it to VCC or tying it
to PGnd.
Sense pin for OVP and PGood
Inverting input to the error amplifier. This pin is connected directly to the
output of the regulator or to the output of the remote sense amplifier, via
resistor divider to set the output voltage and provide feedback to the
error amplifier.
Output of error amplifier. An external resistor and capacitor network is
typically connected from this pin to FB to provide loop compensation.
Remote Sense Amplifier Output
Power ground. This pin should be connected to the system’s power
ground plane. Bypass capacitors between PVin and PGND should be
connected very close to PVIN pin (pin 1) and this pin.
Signal ground for internal reference and control circuitry.
Remote Sense Amplifier input. Connect to ground at the load.
Remote Sense Amplifier input. Connect to output at the load.
External reference voltage can be used for margining operation. A
capacitor between 100pF and 180pF should be connected between this
pin and LGnd. Tie to LGnd for tracking function.
Used for voltage sequencing and tracking. Leave open if sequencing or
tracking is not needed, ensuring that there is no capacitor on the pin.
Power Good status pin. Output is open drain. Connect a pull up resistor
from this pin to VCC.
Input Voltage for LDO.
Bias Voltage for IC and driver section, output of LDO. Add a minimum of
4.7uF bypass cap from this pin to PGnd.
No Connect
Switch node. This pin is connected to the output inductor.
5 www.irf.com © 2013 International Rectifier
May 20, 2013
Free Datasheet http://www.datasheet4u.com/
5 Page 
PARAMETER
SYMBOL
CONDITIONS
IR3847
MIN TYP MAX UNIT
Over-Current Protection
OC Trip Current
Hiccup blanking time
Thermal Shutdown
Thermal Shutdown
Hysteresis
ITRIP
Tblk_Hiccup
OCSet=VCC, VCC =
6.8V, TJ = 25°C
OCSet=floating, VCC =
6.8V, TJ = 25°C
OCSet=PGnd, VCC
=6.8V, TJ = 25°C
Note 4
Note 4
Note 4
Notes:
4. Guaranteed by design but not tested in production.
29.25 32.5 35.75 A
23.4 26 28.6 A
17.55 19.5 21.85
20.48
A
ms
145 °C
20 °C
11 www.irf.com © 2013 International Rectifier
May 20, 2013
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet IR3847.PDF ] | |
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