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PDF IR3843WMPBF Data sheet ( Hoja de datos )
| Número de pieza | IR3843WMPBF | |
| Descripción | HIGHLY EFFICIENT INTEGRATED 2A SYNCHRONOUS BUCK REGULATOR | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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PD-97507
IR3843WMPbFwww.DataSheet4U.com
SupIRBuckTM
HIGHLY EFFICIENT
INTEGRATED 2A SYNCHRONOUS BUCK REGULATOR
Features
• Wide Input Voltage Range 1.5V to 16V
• Wide Output Voltage Range 0.7V to 0.9*Vin
• Continuous 2A 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
• Multiple current ratings in pin compatible footprint
• 5mm x 6mm Power QFN Package, 0.9 mm height
• Lead-free, halogen-free and RoHS compliant
Description
The IR3843W 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
IR3843W a space-efficient solution, providing
accurate power delivery for low output voltage
applications.
IR3843W 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
1.5V <Vin<16V
4.5V <Vcc<5.5V
PGood
Seq Enable
Vcc
PGood
Rt
SS/ SD Gnd
Vin Boot
SW
OCSet
Fb
Comp
PGnd
Vo
Rev 10.0
Fig. 1. Typical application diagram
1
1 page  
Recommended Operating Conditions
PD-97507
IR3843WMPbFwww.DataSheet4U.com
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 16
4.5 5.5
4.5 5.5 V
0.7 0.9*Vin
0 2A
225
1650
kHz
-40 125 oC
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
Symbol
Test Condition
Min TYP MAX Units
Power Loss
Power Loss
MOSFET Rds(on)
Top Switch
Bottom Switch
Ploss
Rds(on)_Top
Rds(on)_Bot
Vcc=5V, Vin=12V, Vo=1.8V, Io=2A,
Fs=600kHz, L=3.3uH, Note4
VBoot -Vsw =5V, ID=2A, Tj=25oC
Vcc=5V, ID=2A, Tj=25oC
0.394
24.5 32
24.5 29.5
W
mΩ
Reference Voltage
Feedback Voltage
Accuracy
VFB
0oC<Tj<125oC
-40oC<Tj<125oC, Note3
0.7
-1.0 +1.0
-2.0 +2.0
V
%
Supply Current
VCC Supply Current (Standby)
Vcc Supply Current (Dyn)
Under Voltage Lockout
VCC-Start-Threshold
VCC-Stop-Threshold
Enable-Start-Threshold
Enable-Stop-Threshold
Enable leakage current
ICC(Standby)
ICC(Dyn)
VCC_UVLO_Start
VCC_UVLO_Stop
Enable_UVLO_Start
Enable_UVLO_Stop
Ien
SS=0V, No Switching, Enable low
SS=3V, Vcc=5V, Fs=500kHz
Enable high
Vcc Rising Trip Level
Vcc Falling Trip Level
Supply ramping up
Supply ramping down
Enable=3.3V
500
10
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
μA
mA
V
μA
Rev 10.0
5
5 Page 
PD-97507
IR3843WMPbFwww.DataSheet4U.com
Typical Efficiency and Power Loss Curves
Vin=5V, Vcc=5V, Io=0.2A-2A, Fs=600kHz, Room Temperature, No Air Flow
The table below shows the inductors used for each of the output voltages
in the efficiency measurement.
Vout (V) L (uH)
P/N
0.7 1.5 PCMB065T-1R5MS
0.75
1.5 PCMB065T-1R5MS
0.9 1.5 PCMB065T-1R5MS
1 2.2 IHLP2525EZ-01 2.2uH
1.1 2.2 IHLP2525EZ-01 2.2uH
1.2 2.2 IHLP2525EZ-01 2.2uH
1.5 2.2 IHLP2525EZ-01 2.2uH
1.8 2.2 IHLP2525EZ-01 2.2uH
2.5 3.3 IHLP2525EZ-01 3.3uH
3.3 2.2 IHLP2525EZ-01 2.2uH
DCR
(mΩ)
6.7
6.7
6.7
13
13
13
13
13
19.9
13
100
95
90
85
80
75
70
65
0.2 0.4 0.6 0.8
1 1.2 1.4 1.6
Iout (A)
0.7V 0.75V 0.9V 1V 1.1V 1.2V 1.5V 1.8V
1.8
2.5V
2
3.3V
Rev 10.0
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0.2
0.4
0.7V 0.75V
0.6
0.9V
0.8 1 1.2 1.4 1.6 1.8 2
Iout (A)
1V 1.1V 1.2V 1.5V 1.8V 2.5V 3.3V
11
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