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PDF IR3853MPBF Data sheet ( Hoja de datos )
| Número de pieza | IR3853MPBF | |
| Descripción | SYNCHRONOUS BUCK REGULATOR | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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PD-97516
IR3853MPbF
SupIRBuckTM
HIGHLY EFFICIENT
INTEGRATED 4A, 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 4A 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 IR3853 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
IR3853 a space-efficient solution, providing
accurate power delivery for low output voltage
applications.
IR3853 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,
over-voltage, 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-97516
IR3853MPbF
Symbol
Definition
Vin
Vcc
Boot to SW
Vo
Io
Fs
Tj
Input Voltage
Supply Voltage
Supply Voltage
Output Voltage
Output Current
Switching Frequency
Junction Temperature
*SW node should not exceed 25V
Min Max Units
1.5 21*
4.5 5.5
4.5 5.5 V
0.7 0.9*Vin
0 4A
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.
P ARAMET ER
POWER STAGE
Power Losses
Top Switch
Bottom Switch
Deadband Time
Bootstrap Diode Forward
Voltage
S YMBO L
TEST CONDITION
Ploss
R ds( o n) _Top
R ds( o n)_ Bo t
Tdb
Vcc=5V, Vin=12V, Vo=1.8V,
Io=4A, Fs=600kHz, L=2.2uH,
Note4
VBoot -Vsw =5V, ID=4A, Tj=25oC
Vcc=5V, ID=4A, Tj=25oC
Note4
I(Boot)= 30mA
MIN TYP MAX UNIT
0.642
W
21
19.75
29
26.5
mΩ
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
I CC( Sta nd by)
SS=0V, Vcc=5V, Enable low ,
No Switching
6 uA
500 uA
VCC Supply Current (Dyn)
ICC(Dyn)
SS=3V, Vcc=5V, Enable high,
Fs =500k Hz
6
11 mA
REFERENCE VOLTAGE
Feedback Voltage
Acc ur ac y
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
V
0.3
Rev 4.0
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
PD-97516
IR3853MPbF
Rdson of MOSFETs Over Temperature at Vcc=5V
27
26
25
24
23
22
21
20
19
18
17
16
-40 -20
0
20 40 60
Temperature [ °C]
80 100 120
Sync-FET
Ctrl-FET
Rev 4.0
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 35 Páginas | |
| PDF Descargar | [ Datasheet IR3853MPBF.PDF ] | |
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