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PDF IR3859MPBF Data sheet ( Hoja de datos )

Número de pieza IR3859MPBF
Descripción SYNCHRONOUS BUCK REGULATOR
Fabricantes International Rectifier 
Logotipo International Rectifier Logotipo



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PD-97514
IR3859MPbF
SupIRBuckTM
HIGHLY EFFICIENT
INTEGRATED 9A, 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 9A 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 IR3859 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
IR3859 a space-efficient solution, providing
accurate power delivery for low output voltage
applications.
IR3859 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 5.0
Fig. 1. Typical application diagram
1
Free Datasheet http://www.datasheet4u.com/

1 page




IR3859MPBF pdf
Recommended Operating Conditions
PD-97514
IR3859MPbF
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 9A
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
SYMBOL
TEST CONDITION
MIN TYP MAX UNIT
POWER STAGE
Power Losses
Ploss
Vcc=5V, Vin=12V, Vo=1.8V,
Io=9A, Fs=600kHz, L=0.68uH,
Note4
2.1
W
Top Switch
Bottom Switch
Deadband Time
Bootstrap Diode Forward
Voltage
Rds(on)_Top
Rds(on)_Bot
Tdb
VBoot -Vsw =5V, ID=9A, Tj=25oC
Vcc=5V, ID=9A, Tj=25oC
Note4
I(Boot)= 30mA
21 29 mΩ
11 16
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(Dyn) SS=3V, Vcc=5V, Enable high, 5.5 9.97 14 mA
Fs=500kHz
REFERENCE VOLTAGE
Feedback Voltage
VFB
0.7 V
Accuracy
0oC<Tj<125oC
-40oC<Tj<125oC, Note3
-1.0
-2.0
+1.0
-2.0
%
SOFT START / SD
Soft Start Current
ISS Source
14 20
26 uA
Soft Start Clamp Voltage
Shutdown Output Threshold
Vss(clamp)
SD
2.7 3.0
3.3
0.3
V
Rev 5.0
5
Free Datasheet http://www.datasheet4u.com/

5 Page





IR3859MPBF arduino
PD-97514
IR3859MPbF
TYPICAL OPERATING CHARACTERISTICS (-40oC - 125oC) Fs=500 kHz
Icc(Standby)
Icc(Dyn)
290 13.5
270 12.5
250
230
210
190
170
150
-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]
11.5
10.5
9.5
8.5
7.5
6.5
5.5
-40
-20
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
0 20 40 60
Temp[ oC]
IOCSET(500kHz)
0 20 40 60
Temp[ oC]
80 100 120
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 5.0
11
Free Datasheet http://www.datasheet4u.com/

11 Page







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