IR3826
IR 8
Features
OptiMOS™ IPOL
23 A single-voltage synchronous Buck regulator
Single 5 V to 17 V application or Wide Input Voltage Range from 1.0 V to 17 V with external Vcc
Precision Reference Voltage (0.6 V
±
0.6%) for Output Voltage Range: 0.6 V to 0.86×Vin
Enhanced Line/Load Regulation with Feed-Forward
Programmable Switching Frequency up to 1.5 MHz
Monotonic Start-Up with Internal Digital Soft-Start & Enhanced Pre-Bias Start-Up
Thermally Compensated Internal Over-Current Protection with Three Selectable Settings
Enable input with Voltage Monitoring Capability & Programmable Power Good Output
Thermal Shut Down
Operating temp: -40
°C
< Tj < 125
°C
Small Size: 6 mm x 5 mm PQFN
Lead-free, Halogen-free and RoHS2 Compliant
Potential applications
Server Applications
Storage Applications
Telecom & Datacom Applications
Distributed Point of Load Power Architectures
Product validation
Qualified for industrial applications according to the relevant tests of JEDEC47/20/22
Description
The IR3826 is an easy-to-use, fully integrated and highly efficient dc-dc regulator.
The onboard PWM controller and OptiMOS™ FETs with integrated bootstrap diode make the IR
a small
footprint solution, providing high-efficiency power delivery.
The IR3826 is a versatile regulator, operating with wide input and output voltage range, offering programmable
switching frequency from 300 kHz to 1.5 MHz, and providing three selectable over current limits.
It also features important protection functions, such as pre-bias start-up, thermally compensated current limit,
over voltage protection and thermal shutdown to give required system level security in the event of fault
conditions.
Final Datasheet
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Please read the Important Notice and Warnings at the end of this document
page 1 of 53
V2.4
June 28 2019
IR 8
OptiMOS™ IPOL
23 A single-voltage synchronous Buck regulator
Table of contents
Table of contents
Features ........................................................................................................................................ 1
Potential applications ..................................................................................................................... 1
Product validation .......................................................................................................................... 1
Description .................................................................................................................................... 1
Table of contents ............................................................................................................................ 2
1
2
3
4
5
6
7
8
8.1
8.2
8.3
9
10
11
Ordering information ............................................................................................................. 4
Functional block diagram........................................................................................................ 5
Typical application diagram .................................................................................................... 6
Pin descriptions ..................................................................................................................... 7
Absolute maximum ratings ..................................................................................................... 8
Electrical specifications .......................................................................................................... 9
Electrical characteristics ........................................................................................................ 10
Typical efficiency and power loss curves .................................................................................. 13
PV
in
= V
in
= 12 V, F
s
= 600 kHz .................................................................................................................. 13
PV
in
= V
in
= 12 V, F
s
= 1000 kHz ................................................................................................................ 14
PV
in
= V
in
= Vcc = 5 V, F
s
= 600 kHz ........................................................................................................... 15
Thermal Derating curves ........................................................................................................ 16
R
DS(ON)
of MOSFET Over Temperature ........................................................................................ 17
Typical operating characteristics (-40 °C to +125 °C) .................................................................. 18
12
Theory of operation ............................................................................................................... 20
12.1
Description ............................................................................................................................................ 20
12.2
Voltage Loop Compensation design ..................................................................................................... 20
12.3
Under-Voltage Lockout and POR .......................................................................................................... 21
12.4
Enable .................................................................................................................................................... 21
12.5
Pre-Bias startup ..................................................................................................................................... 23
12.6
Soft-start ................................................................................................................................................ 23
12.7
Operating frequency ............................................................................................................................. 24
12.8
Shutdown .............................................................................................................................................. 25
12.9
Over Current Protection ........................................................................................................................ 25
12.10
Thermal shutdown ................................................................................................................................ 26
12.11
Feed-forward ......................................................................................................................................... 26
12.12
Low Dropout Regulator (LDO)............................................................................................................... 27
12.13
Power Good Output .............................................................................................................................. 27
Over-Voltage Protection (OVP) ............................................................................................................. 28
12.14
12.15
Minimum On-Time Considerations....................................................................................................... 29
Maximum Duty Ratio ............................................................................................................................. 29
12.16
Design example..................................................................................................................... 31
13
13.1
Enabling the IR3826............................................................................................................................... 31
13.2
Programming the Frequency ................................................................................................................ 31
13.3
Output Voltage Programming............................................................................................................... 32
13.4
Bootstrap Capacitor Selection.............................................................................................................. 32
13.5
Input Capacitor Selection ..................................................................................................................... 33
13.6
Inductor Selection ................................................................................................................................. 33
13.7
Output Capacitor Selection .................................................................................................................. 34
Feedback Compensation ...................................................................................................................... 35
13.8
Final Datasheet
2 of 53
V2.4
June 28 2019
IR 8
OptiMOS™ IPOL
23 A single-voltage synchronous Buck regulator
Table of contents
13.9
13.10
14
Application Diagram.............................................................................................................................. 37
Suggested Bill of Materials for the Application Circuit ........................................................................ 37
Typical Operating Waveforms ................................................................................................. 39
15
Layout Recommendations...................................................................................................... 42
15.1
PCB Metal and Component Placement ................................................................................................ 46
15.2
Solder Mask ........................................................................................................................................... 47
15.3
Stencil Design ........................................................................................................................................ 48
16
Package ............................................................................................................................... 49
16.1
Marking Information ............................................................................................................................. 49
16.2
Dimensions ............................................................................................................................................ 50
17
Environmental Qualifications ................................................................................................. 52
Revision history............................................................................................................................. 53
Final Datasheet
3 of 53
V2.4
June 28 2019
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