PD-97605
IR3863MPBF
SupIRBuck
Features
TM
6A HIGHLY INTEGRATED
WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR
Description
The IR3863
SupIRBuck
TM
is an easy-to-use, fully
integrated and highly efficient DC/DC voltage
regulator. The onboard constant on-time
hysteretic controller and MOSFETs make IR3863
a space-efficient solution that delivers up to 6A of
precisely controlled output voltage.
Programmable switching frequency, soft start,
and thermally compensated over current
protection allows for a very flexible solution
suitable for many different applications and an
ideal choice for battery powered applications.
Additional features include pre-bias startup, very
precise 0.5V reference, over/under voltage shut
down, power good output, and enable input with
voltage monitoring capability.
Input Voltage Range: 3V to 21V
Output Voltage Range: 0.5V to 12V
Continuous 6A Load Capability
Constant On-Time Control
Compensation Loop not Required
Excellent Efficiency at Very Low Output Currents
Programmable Switching Frequency and Soft
Start
Thermally Compensated Over Current
Protection
Power Good Output
Precision Voltage Reference (0.5V, +/-1%)
Enable Input with Voltage Monitoring Capability
Pre-bias Start Up
Thermal Shut Down
Under/Over Voltage Fault Protection
Forced Continuous Conduction Mode Option
Very Small, Low Profile 4mm x 5mm QFN
Package
Applications
Notebook and Desktop Computers
Game Consoles
Consumer Electronics – STB, LCD, TV, Printers
General Purpose POL DC-DC Converters
8/8/2012 Rev3.2
1
IR3863MPBF
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND unless otherwise specified)
•
•
•
•
•
•
•
•
•
•
•
•
VIN, FF …………………………………………………. -0.3V to 25V
VCC, PGOOD, EN …………………………………..... -0.3V to 8.0V
BOOT …………………………………………………… -0.3V to 33V
PHASE …………………………………………………. -0.3V to 25V(DC), -5V(100ns)
BOOT to PHASE ………………………………………. -0.3V to 8V
ISET …………………………………………………….. -0.3V to 25V, 30mA
PGND to GND …………………………………………. -0.3V to +0.3V
All other pins …………………………………………… -0.3V to 3.9V
Storage Temperature Range ………………………… -65°C To 150°C
Junction Temperature Range ………………………… -40°C To 150°C
ESD Classification …………………………………….. JEDEC Class 1C
Moisture Sensitivity Level ……………………..……… JEDEC Level 2 @ 260°C (Note 2)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress ratings only and functional operation of the device at these or any other
conditions beyond those indicated in the operational sections of the specifications are not implied.
PACKAGE INFORMATION
4mm x 5mm POWER QFN
JA
½
32
o
C
/
W
J
-
PCB
½
2
o
C
/
W
ORDERING INFORMATION
PKG DESIG
M
M
8/8/2012 Rev3.2
PACKAGE
DESCRIPTION
IR3863MTRPbF
IR3863MTR1PbF
PIN COUNT
17
17
PARTS PER
REEL
4000
750
2
IR3863MPBF
Simplified Block Diagram
8/8/2012 Rev3.2
3
IR3863MPBF
Pin Description
NAME
FCCM
NUMBER
1
I/O
LEVEL
3.3V
DESCRIPTION
Forced Continuous Conduction Mode (CCM). Ground this pin
to enable diode emulation mode or discontinuous conduction
mode (DCM). Pull this pin to 3.3V to operate in CCM under all
load conditions.
Connecting resistor to PHASE pin sets over current trip point.
5V
Reference
3.3V
3.3V
Power good open drain output – pull up with a resistor to 3.3V
Bias return and signal reference.
Inverting input to PWM comparator, OVP / PGOOD sense.
Soft start/shutdown. This pin provides user programmable soft-
start function. Connect an external capacitor from this pin to
GND to set the startup time of the output voltage. The converter
can be shutdown by pulling this pin below 0.3V.
-
For internal LDO. Bypass with a 1.0µF capacitor to AGND. A
resistor in series with the bypass capacitor may be required in
single-ground plane designs. Refer to
Layout
Recommendations
for details.
-
VCC input. Gate drive supply. A minimum of 1.0µF ceramic
capacitor is required.
Power return.
Phase node (or switching node) of MOSFET half bridge.
Input voltage for the system.
Bootstrapped gate drive supply – connect a capacitor to
PHASE.
Input voltage feed forward – sets on-time with a resistor to VIN.
Enable pin to turn on and off the device. Use two external
resistors to set the turn on threshold (see
Electrical
Specifications)
for input voltage monitoring.
ISET
PGOOD
GND
FB
SS
2
3
4,17
5
6
NC
3VCBP
7
8
-
3.3V
NC
VCC
PGND
PHASE
VIN
BOOT
FF
EN
9
10
11
12
13
14
15
16
-
5V
Reference
VIN
VIN
VIN +VCC
VIN
5V
8/8/2012 Rev3.2
4
IR3863MPBF
Recommended Operating Conditions
Symbol
VIN
VCC
V
OUT
I
OUT
Fs
T
J
Definition
Input Voltage
Supply Voltage
Output Voltage
Output Current
Switching Frequency
Junction Temperature
Min
3
4.5
0.5
0
N/A
-40
Max
21*
5.5
12
6
750
125
Unit
V
A
kHz
o
C
*
PHASE pin must not exceed 25V.
Electrical Specifications
Unless otherwise specified, these specification apply over VIN = 12V, 4.5V<VCC<5.5V, 0
o
C ≤ T
J
≤ 125
o
C.
PARAMETER
CONTROL LOOP
Reference Accuracy, V
REF
On-Time Accuracy
Min Off Time
Soft-Start Current
DCM Comparator Offset
SUPPLY CURRENT
VCC Supply Current
(standby)
VCC Supply Current
(dynamic)
FF Shutdown Current
EN = Low, No Switching
EN = High, Fs = 300kHz
EN = Low
2
0.6
23
6
2
µA
mA
µA
V
V
NOTE
TEST CONDITION
V
FB
= 0.5V
R
FF
= 180K, T
J
= 65
o
C
EN = High
Measure at V
PHASE
MIN
0.495
280
8
-4.5
TYP
0.5
300
500
10
-2.5
MAX
0.505
320
12
0
UNIT
V
ns
ns
µA
mV
FORCED CONTINUOUS CONDUCTION MODE (FCCM)
FCCM Start Threshold
FCCM Stop Threshold
8/8/2012 Rev3.2
5
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