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PDF IR3856WMPBF Data sheet ( Hoja de datos )
| Número de pieza | IR3856WMPBF | |
| Descripción | SYNCHRONOUS BUCK REGULATOR | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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PD-97506
IR3856WMPbF
SupIRBuckTM
HIGHLY EFFICIENT
INTEGRATED 6A, SYNCHRONOUS BUCK REGULATOR
Features
• Greater than 95% Maximum Efficiency
• Wide Input Voltage Range 1.5V to 16V
• 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
• 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
• -40oC to 125oC operating junction temperature
• Thermal Protection
• 4mm x 5mm Power QFN Package
• Halogen Free, Lead Free and RoHS compliant
Applications
• Server Applications
• Storage Applications
• Embedded Telecom Systems
• Distributed Point of Load Power Architectures
Description
The IR3856W 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
IR3856W a space-efficient solution, providing
accurate power delivery for low output voltage
applications.
IR3856W 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.
• Netcom Applications
• Computing Peripheral Voltage Regulators
• General DC-DC Converters
Rev 9.0
Fig. 1. Typical application diagram
1
Free Datasheet http://www.Datasheet4U.com
1 page  
Recommended Operating Conditions
PD-97506
IR3856WMPbF
Symbol
Vin
P Vcc, 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 16
4.5 5.5
4.5 5.5 V
0.7 0.9*Vin
0 6A
225
1650
kHz
-40 125 oC
Electrical Specifications
Unless otherwise specified, these specification apply over 4.5V< PVcc=Vcc<5.5V, Vin=12V
0oC<Tj< 125oC. Typical values are specified at Ta = 25oC.
Parameter
Symbol
Test Condition
Min TYP MAX
Power Loss
Power Loss
MOSFET Rds(on)
Top Switch
Bottom Switch
P loss
Rds(on)_Top
Rds(on)_Bot
Vcc=5V, Vin=12V, Vo=1.8V, Io=6A,
Fs=600kHz, L=0.82uH, Note4
VBoot -Vsw =5V, ID =6A, Tj=25oC
Vcc=5V, ID=6A, Tj=25oC
1.3
22.6
14.3
29.0
19
Reference Voltage
Feedback Voltage
Acc urac y
VFB
0oC<Tj<125oC
-40oC<Tj<125oC, Note3
-1.0
+2.0
0.7
+1.0
+2.0
Supply Current
VCC Supply Current (Standby)
Vcc Supply Current (Dyn)
PVCC Supply Current (Standby)
PVcc Supply Current (Dyn)
I CC( St and by)
ICC(Dyn)
IPCC(Standby)
I PCC(Dyn)
Under Voltage Lockout
VCC-S tart- Threshold
VCC-S top-T hreshold
Enable-St ar t-T hreshold
VCC_UVLO_Start
VCC_UVLO_Stop
Enable_UV LO _Start
Enable-Stop-Threshold
Enable_UV LO _Stop
Enable leakage current
Ien
SS=0V, No Switching, Enable low
SS=3V, Vcc=5V, Fs=500kHz
Enable high
SS=0V, No Switching, Enable low
SS=3V, PVcc=5V, Fs=500kHz
Enable high
Vcc Rising Trip Level
Vcc Falling Trip Level
Supply ramping up
Supply ramping down
E nable=3.3V
500
3
6
7
3.95
3.65
1.14
0.9
4.15
3.85
1.2
1.0
4.35
4.05
1.36
1.06
15
Units
W
mΩ
V
%
μA
mA
μA
mA
V
μA
Rev 9.0
5
Free Datasheet http://www.Datasheet4U.com
5 Page 
PD-97506
IR3856WMPbF
Typical Efficiency and Power Loss Curves
Vin=5V, Vcc=5V, Io=1A-6A, Fs=600kHz, Room Temperature, No Air Flow
The table below shows the inductors used for each of the output voltages
in the efficiency measurement.
Vo (V)
0.7
0.75
0.9
1.0
1.1
1.2
1.5
1.8
2.5
3.3
L (uH)
0.56
0.56
0.56
0.56
0.68
0.68
0.68
0.82
0.82
0.82
P/N
IHLP2525EZERR56M
IHLP2525EZERR56M
IHLP2525EZERR56M
IHLP2525EZERR56M
PCMB065T-R68MS
PCMB065T-R68MS
PCMB065T-R68MS
IHLP2525EZERR82M
IHLP2525EZERR82M
IHLP2525EZERR82M
DCR (mOhm)
3.4
3.4
3.4
3.4
3.9
3.9
3.9
4.6
4.6
4.6
96
94
92
90
88
86
84
82
80
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Load Current (A)
0.7V 0.75V 0.9V 1.0V 1.1V 1.2V 1.5V 1.8V 2.5V 3.3V
Rev 9.0
1.3
1.1
0.9
0.7
0.5
0.3
0.1
1
1.5 2
0.7Vout
1.2Vout
2.5 3 3.5 4 4.5
Load Current (A)
0.75Vout
1.5Vout
0.9Vout
1.8Vout
1.0Vout
2.5Vout
5 5.5
1.1Vout
3.3Vout
6
11
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