IR3888
IR3888 OptiMOS™
IPOL
25 A single-voltage synchronous Buck regulator
Features
Single 4.3 V to 17 V application or Wide Input Voltage Range from 2.0 V to 17 V with an External VCC
Precision Reference Voltage (0.6 V +/- 0.5%)
Enhanced Fast COT engine stable with Ceramic Output Capacitors and No External Compensation
Optional Forced Continuous Conduction Mode and Diode Emulation for Enhanced Light Load Efficiency
Programmable Switching Frequency from 600 kHz to 2 MHz
Monotonic Start-Up with Four Selectable Soft-Start Time & Enhanced Pre-Bias Start-Up
Thermally Compensated Internal Over Current Protection with Four Selectable Settings
Enable input with Voltage Monitoring Capability & Power Good Output
Thermal Shut Down
Operating Temp: -40
°C
< T
j
< 125
°C
Small Size: 6 mm x 5 mm PQFN
Halogen-free and RoHS2 Compliant with Exemption 7a
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 IR3888 is an easy-to-use, fully integrated dc - dc Buck regulator. The onboard
PWM controller and OptiMOS™
FETs with integrated bootstrap diode make IR3888 a small footprint solution, providing high-efficient power
delivery. Furthermore, it uses a fast Constant On-Time (COT) control scheme, which simplifies the design efforts
and achieves fast control response.
The IR3888 has an internal low dropout voltage regulator, allowing operations with a single supply. It can also
operate with an external bias supply, extending the operating input voltage (PVin) range.
The IR3888 is a versatile regulator, offering programmable switching frequency from 600 kHz to 2 MHz, four
selectable current limits, four selectable soft-start time, Forced Continuous Conduction Mode (FCCM) and Diode
Emulation Mode (DEM) operation.
It also features important protection functions, such as pre-bias start-up, thermally compensated current limits,
over voltage and under voltage protection, and thermal shutdown to give required system level security in the
event of fault conditions.
Final Datasheet
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IR 888 OptiMOS™ IPOL
25 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
6.1
7
7.1
7.2
8
8.1
8.2
8.3
8.4
9
10
11
Ordering information ............................................................................................................. 4
Functional block diagram........................................................................................................ 5
Typical application diagram .................................................................................................... 6
Pin descriptions ..................................................................................................................... 7
Absolute maximum ratings ..................................................................................................... 9
Thermal Characteristics ......................................................................................................... 10
Thermal Characteristics ........................................................................................................................ 10
Electrical specifications ......................................................................................................... 11
Recommended operating conditions................................................................................................... 11
Electrical characteristics ....................................................................................................................... 12
Typical efficiency and power loss curves.................................................................................. 15
PV
in
= V
in
= 12 V, F
sw
= 600 kHz ................................................................................................................ 15
PV
in
= V
in
= 12 V, F
sw
= 800 kHz ................................................................................................................ 16
PV
in
= V
in
= 12 V, F
sw
= 1000 kHz............................................................................................................... 17
PV
in
= V
in
= VCC = 5 V, F
sw
= 600 kHz ........................................................................................................ 18
Thermal De-rating curves ....................................................................................................... 19
R
DS(ON)
of MOSFET Over Temperature ........................................................................................ 20
Typical operating characteristics (-40 °C
≤
T
j
≤
+125 °C) .............................................................. 21
12
Theory of operation ............................................................................................................... 24
12.1
Fast Constant On-Time Control ............................................................................................................ 24
12.2
Enable .................................................................................................................................................... 24
12.3
FCCM and DEM Operation ..................................................................................................................... 25
12.4
Pseudo Constant Switching Frequency................................................................................................ 25
12.5
Soft-start ................................................................................................................................................ 26
12.6
Pre-bias Start-up ................................................................................................................................... 27
12.7
Internal Low
–
Dropout (LDO) Regulator .............................................................................................. 27
12.8
Over Current Protection (OCP) ............................................................................................................. 28
12.9
Under Voltage Protection (UVP) ........................................................................................................... 29
12.10
Over Voltage Protection (OVP) .............................................................................................................. 29
12.11
Over Temperature Protection (OTP) .................................................................................................... 30
Power Good (Pgood) Output ................................................................................................................ 30
12.12
Minimum On
–
Time and Minimum Off
–
Time ..................................................................................... 31
12.13
12.14
Selection of Feedforward Capacitor and Feedback Resistors ............................................................. 31
12.15
Resistors for Configuration Pins ........................................................................................................... 32
13
Design example..................................................................................................................... 33
13.1
Enabling the IR3888............................................................................................................................... 33
13.2
Programming the Switching Frequency and Operation Mode ............................................................ 33
Selecting Input Capacitors .................................................................................................................... 33
13.3
Inductor Selection ................................................................................................................................. 34
13.4
Final Datasheet
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IR 888 OptiMOS™ IPOL
25 A single-voltage synchronous Buck regulator
Table of contents
13.5
13.6
13.7
13.8
13.9
Output Capacitor Selection .................................................................................................................. 34
Output Voltage Programming............................................................................................................... 35
Feedforward Capacitor ......................................................................................................................... 35
Bootstrap Capacitor .............................................................................................................................. 35
VIN and VCC/LDO bypass Capacitor ..................................................................................................... 35
14
Application Information ......................................................................................................... 36
14.1
Application Diagram.............................................................................................................................. 36
14.2
Typical Operating Waveforms............................................................................................................... 36
15
Layout Recommendations...................................................................................................... 39
15.1
Solder Mask ........................................................................................................................................... 43
15.2
Stencil Design ........................................................................................................................................ 44
16
Package ............................................................................................................................... 45
16.1
Marking Information ............................................................................................................................. 45
16.2
Dimensions ............................................................................................................................................ 45
16.3
Tape and Reel Information ................................................................................................................... 46
17
18
Environmental Qualifications ................................................................................................. 47
Evaluation Boards and Support Documentation ....................................................................... 48
Revision history............................................................................................................................. 49
Final Datasheet
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IR 888 OptiMOS™ IPOL
25 A single-voltage synchronous Buck regulator
Ordering information
1
1.
Ordering information
Ordering Information
Sales Product Name
IR3888MTRPBF
Package Type
QFN 6 mm x 5 mm
Standard Pack Form and Qty
Tape and Reel
5000
Orderable Part Number
IR3888MTRPBFAUMA1
IR3888MTRPBF
A1
Designator
Packing type
UM
Moisture
protection packing
Packing size
Halogen Free
RoHS compliant
Total lead free
Tape & Reel
Dry
330 mm
Yes
Yes
No
A
NC
22
EN
21
BOOT
20
PVIN
19
PVIN
18
PVIN
17
FB
1
SS/ Latch
2
VSENM
3
16
SW
AGND
AGND
4
23
15
SW
Ton/ Mode
5
14
SW
ILIM
6
PGOOD
7
8
9
10
11
12
13
VSNS
VIN VCC/ LDO
PGND
PGND
PGND
Figure 1 Package Top View
Final Datasheet
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IR 888 OptiMOS™ IPOL
25 A single-voltage synchronous Buck regulator
Functional block diagram
2
Functional block diagram
AGND
AGND
PGood
Vin
VCC/LDO
VREF
*70%
POR
UVP OTP
+
-
Fault
AGND
EN
LDO
VCC
LDrVin
+
OVP
Hysteresis
=5%
BOOT
VREF
*120%
VSNS
-
Turn-on Delay
PVIN
Q
S
R
Prebias
PGood
+
Q
Fault
HDrVin
HDrv
VREF
*90%
-
Hysteresis
=5%
POR
VCC
4.0V
+
-
POR
Hiccup
OVP
OTP
GATE
DRIVE
LOGIC
VCC
SW
EN
1.2V
+
-
Fault
LDrVin
PWM
LDrv
SS/Latch
SOFT
START
SS
PWM
COMP
+
-
-
+
SET
ADAPTIVE
ON-TIME
GENERATOR
ZC
Zero Cross
DETECTION
PGND
SW
PGND
FB
VREF
+
-
OCP
Floor
GENERATOR
VSENM
+
RAMP
GENERATOR
+
-
OVP
Latch Off
UVP
S
R
Q
Hiccup
TON/
MODE
ILIM
ILIM Ref
SW
20ms
Delay
Figure 2 Block diagram
Final Datasheet
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