IR3837MPbF Datasheet PDF - International Rectifier
| Part Number | IR3837MPbF | |
| Description | SYNCHRONOUS BUCK REGULATOR | |
| Manufacturers | International Rectifier | |
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PD97511
IR3837MPbF
SupIRBuckTM
HIGHLY INTEGRATED 14A
SINGLE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR
Features
• Greater than 96% Maximum Efficiency
• Single 16V Application
• Single 5V Application
• Wide Output Voltage Range: 0.6V to 0.9*Vin
• Continuous 14A Load Capability
• Programmable Switching Frequency up to 1.5MHz
• Internal Digital Soft-Start
• Enable Input with Voltage Monitoring Capability
• Hiccup Mode Over Current Protection
• Internal LDO
• External Synchronization
• Enhanced PreBias Start up
• External Reference for Margining Purposes
• Input for Tracking Applications
• Integrated MOSFET Drivers and Bootstrap Diode
• Operating Junction Temp: -40oC <Tj<125oC
• Thermal Shut Down
• Power Good Output with Tracking Capability
• Over Voltage Detection Feature
• Pin Compatible with 6A and 10A Versions
• Small Size 5mmx6mm PQFN, 0.9 mm Height
• Lead-free, Halogen-free and RoHS Compliant
Description
The IR3837 SupIRBuckTM is an easy-to-use, fully
integrated and highly efficient DC/DC regulator.
The onboard PWM controller and MOSFETs
make IR3837 a space-efficient solution, providing
accurate power delivery for low output voltage
applications.
IR3837 is a versatile regulator which offers
programmability of switching frequency and
current limit while operates 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.
IR3837 offers margining capability through Vref
pin. During the margining operation, PGood
tracks Vref via feedback to ensure correct status
of the output voltage.
Applications
• Netcom and Telecom Applications
• Data Center Applications
• Distributed Point of Load Power Architectures
The internal LDO enables the device to operate
from a single supply. This internal LDO can be
bypassed when an external bias voltage is
available.
Rev 1.31
Fig. 1. Typical application diagram
1
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Recommended Operating Conditions
IR3837MPbF
Symbol
PVin
Vin
Vcc/LDO_out
Boot to SW
Vo
Io
Fs
Tj
Definition
Input Voltage for power stage
Input Voltage for internal LDO *
Supply Voltage *
Supply Voltage
Output Voltage
Output Current
Switching Frequency
Junction Temperature
Min
1.5
7.0
4.5
4.5
0.6
0
225
-40
Max
16
16
6.5
7.5
0.9*Vin
14
1650
125
Units
V
A
kHz
oC
* Vcc/LDO_out can be connected to an external regulated supply (≈ 5V). If so, the Vin input should be
left unconnected.
Electrical Specifications
Unless otherwise specified, these specification apply over, 7.0V<Vin=PVin<16V, Vref=0.6V
in 0oC<Tj< 125oC. Typical values are specified at Ta = 25oC.
PARAMETER
POWER STAGE
Power Losses
Top Switch
Bottom Switch
Bootstrap Diode Forward
Voltage
SW leakage Current
SYMBOL
TEST CONDITION
Ploss
Rds(on)_Top
Rds(on)_Bot
Vin=12V, Vo=1.8V, Io=14A,
Fs=600kHz, L=0.51uH, Note4
VBoot -Vsw =5.0V,
ID=14A,Tj=25C
Vcc=5.0V, ID=14A
I(Boot)= 30mA
Isw SW=0V, Enable=0V
SW=0V, Enable=high, Vp=0V
MIN TYP MAX UNIT
3
12 16
5.3 7
180 260 470
6
14
W
mΩ
mV
µA
SUPPLY CURRENT
Vin Supply Current (Standby)
Vin Supply Current (Dyn)
Iin(Standby)
Iin(Dyn)
INTERNAL REGULATOR (LDO)
Output Voltage
IntVcc
IntVcc Dropout
Short Circuit Current
IntVcc_drop
Ishort
Enable low , No Switching,
Enable high, Fs=500kHz,
Vin=12V
Vin(min)=7.0V, Io=0-50mA,
Cload=2.2uF
Io=50mA, Cload=2.2uF
400 µA
17 mA
4.7 5.2 5.7
V
50 150 mV
70 mA
INTERNAL DIGITAL SOFT START
Soft Start Clock Frequency
Clk(SS)
Soft Start Ramp Rate
Ramp(SS)
Note4
168 200 254
kHz
0.2 mV/us
Rev 1.31
5
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| Information | Total 30 Pages | |
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