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Número de pieza | IR3856MPBF | |
Descripción | SYNCHRONOUS BUCK REGULATOR | |
Fabricantes | International Rectifier | |
Logotipo | ||
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No Preview Available ! PD-97528
IR3856MPbF
SupIRBuckTM
HIGHLY EFFICIENT
INTEGRATED 6A, SYNCHRONOUS BUCK REGULATOR
Features
• Greater than 95% Maximum Efficiency
• Wide Input Voltage Range 1.5V to 21V
• Wide Output Voltage Range 0.7V to 0.9*Vin
• Continuous 6A Load Capability
• Integrated Bootstrap-diode
• High Bandwidth E/A for excellent transient
performance
• Programmable Switching Frequency up to 1.5MHz
• Programmable Over Current Protection
• Over Voltage Protection
• Dedicated input for output voltage monitoring
• Programmable PGood output
• Hiccup Current Limit
• Precision Reference Voltage (0.7V, +/-1%)
• Programmable Soft-Start
• Enable Input with Voltage Monitoring Capability
• Enhanced Pre-Bias Start-up
• Seq input for Tracking applications
• External Synchronization
• -40oC to 125oC operating junction temperature
• Thermal Protection
• 4mm x 5mm Power QFN Package
• Halogen Free, Lead Free and RoHS compliant
Description
The IR3856 SupIRBuckTM is an easy-to-use, fully
integrated and highly efficient DC/DC
synchronous Buck regulator. The MOSFETs co-
packaged with the on-chip PWM controller make
IR3856 a space-efficient solution, providing
accurate power delivery for low output voltage
applications.
IR3856 is a versatile regulator which offers
programmability of start up time, switching
frequency and current limit while operating in
wide input and output voltage range.
The switching frequency is programmable from
250kHz to 1.5MHz for an optimum solution.
It also features important protection functions,
such as Pre-Bias startup, hiccup current limit and
thermal shutdown to give required system level
security in the event of fault conditions.
Applications
• Server Applications
• Storage Applications
• Embedded Telecom Systems
• Distributed Point of Load Power Architectures
• Netcom Applications
• Computing Peripheral Voltage Regulators
• General DC-DC Converters
Rev 4.0
Fig. 1. Typical application diagram
1
Free Datasheet http://www.datasheet4u.com/
1 page Recommended Operating Conditions
PD-97528
IR3856MPbF
Symbol
Vin
Vcc
Boot to SW
Vo
Io
Fs
Tj
Definition
Input Voltage
Supply Voltage
Supply Voltage
Output Voltage
Output Current
Switching Frequency
Junction Temperature
Min
Max
Units
1.5 21*
4.5 5.5
4.5 5.5 V
0.7 0.9*Vin
0 6A
225
1650
kHz
-40 125 oC
* Note: SW node should not exceed 25V
Electrical Specifications
Unless otherwise specified, these specification apply over 4.5V< Vcc<5.5V, Vin=12V, 0oC<Tj< 125oC.
Typical values are specified at Ta = 25oC.
PARAMETER
POWER STAGE
Power Losses
SYMBOL
TEST CONDITION
Ploss
Vcc=5V, Vin=12V, Vo=1.8V,
Io=6A, Fs=600kHz, L=1.0uH,
Note4
MIN TYP MAX UNIT
1.11
W
Top Switch
Bottom Switch
Deadband Time
Bootstrap Diode Forward
Voltage
Rds(on)_Top
Rds(on)_Bot
Tdb
VBoot -Vsw =5V, ID=6A, Tj=25oC
Vcc=5V, ID=6A, Tj=25oC
Note4
I(Boot)= 30mA
22 29 mΩ
13.4
19
5 10 30 ns
180 260 470 mV
SW leakage Current
SUPPLY CURRENT
VCC Supply Current (Standby)
Isw SW=0V, Enable=0V
SW=0V, Enable=high, SS=3V,
Vseq=0V, Note4
ICC(Standby)
SS=0V, Vcc=5V, Enable low ,
No Switching
6 uA
500 uA
VCC Supply Current (Dyn)
ICC(Dy n)
SS=3V, Vcc=5V, Enable high,
Fs=500kHz
9.25
mA
REFERENCE VOLTAGE
Feedback Voltage
Accuracy
VFB
0oC<Tj<125oC
-40oC<Tj<125oC, Note3
0.7 V
-1.0 +1.0
-2.0 -2.0 %
SOFT START / SD
Soft Start Current
ISS Source
14 20
26 uA
Soft Start Clamp Voltage
Shutdown Output Threshold
Vss(clam p)
SD
2.7 3.0
3.3
0.3
V
Rev 4.0
5
Free Datasheet http://www.datasheet4u.com/
5 Page PD-97528
IR3856MPbF
TYPICAL OPERATING CHARACTERISTICS (-40oC - 125oC) Fs=500 kHz
Icc(Standby)
Icc(Dyn)
290 13.5
270 12.5
11.5
250
10.5
230
9.5
210 8.5
190 7.5
170 6.5
150
-40 -20
0
20 40 60 80 100 120
Temp[ oC]
5.5
-40 -20 0 20 40 60 80 100 120
Temp[ oC]
550 FREQUENCY
540
530
520
510
500
490
480
470
460
450
-40 -20 0 20 40 60 80 100 120
Temp[ oC]
54.0
53.0
52.0
51.0
50.0
49.0
48.0
47.0
46.0
45.0
44.0
43.0
-40
-20
IOCSET(500kHz)
0 20 40 60
Temp[ oC]
80 100 120
4.46
4.41
4.36
4.31
4.26
4.21
4.16
4.11
4.06
-40
-20
1.36
1.34
1.32
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
-40
-20
26.0
Vcc(UVLO) Start
0 20 40 60
Temp[ oC]
Enable(UVLO) Start
0 20 40 60
Temp[ oC]
ISS
80 100 120
80 100 120
24.0
4.16
4.11
4.06
4.01
3.96
3.91
3.86
3.81
3.76
-40
-20
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0.92
0.90
-40
-20
711
Vcc(UVLO) Stop
0 20 40 60
Temp[ oC]
Enable(UVLO) Stop
0 20 40 60
Temp[ οC]
Vfb
80 100 120
80 100 120
22.0
706
20.0
701
18.0
696
16.0
691
14.0
-40 -20 0 20 40 60 80 100 120
Temp[ oC]
686
-40 -20 0 20 40 60 80 100 120
Temp[ oC]
Rev 4.0
11
Free Datasheet http://www.datasheet4u.com/
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet IR3856MPBF.PDF ] |
Número de pieza | Descripción | Fabricantes |
IR3856MPBF | SYNCHRONOUS BUCK REGULATOR | International Rectifier |
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