Data Sheet No.PD94714 revA
IR3624MPBF
HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER
Features
•
•
•
•
•
•
•
•
•
Internal 600kHz Oscillator
Operates with Single 5V or 12V Supply
Programmable Over Current Protection
Hiccup Current Limit Using MOSFET R
DS(on)
sensing
Precision Reference Voltage (0.6V)
Programmable Soft-Start
Pre-Bias Start-up
Thermal Protection
10-Lead MLPD Package
Description
The IR3624 is a PWM controller designed for
high performance synchronous Buck DC/DC
applications. The IR3624 drives a pair of external
N-MOSFETs using a fixed 600kHz switching
frequency allowing the use of small external
components. The output voltage can be precisely
regulated using the internal 0.6V reference
voltage for low voltage applications. Protection
such as Pre-Bias startup, hiccup current limit and
thermal shutdown are provided to give required
system level security in the event of fault
conditions.
Applications
•
•
•
•
•
Embedded Telecom Systems
Distributed Point of Load Power Architectures
Computing Peripheral Voltage Regulator
Graphics Card
General DC/DC Converters
Vin
Vc
Vcc
HDrv
OCSet
U1
Comp
LDrv
PGnd
SS / SD
Gnd
Fb
Vout
Fig. 1: Typical application Circuit
ORDERING INFORMATION
PKG
DESIG
M
M
PACKAGE
DESCRIPTION
IR3624MPBF
IR3624MTRPBF
PIN
PARTS
PARTS
COUNT PER TUBE PER REEL
10
121
-------
10
--------
3000
T&R
ORIANTAION
Figure A
IR3624MPBF
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND)
•
•
•
•
•
•
Vcc Supply Voltage ................................................… -0.5V to 16V
Vc Supply Voltage …………………………………….. -0.5V to 30V
Storage Temperature Range ..................................... -65°C To 150°C
Operating Junction Temperature Range ................... -40°C To 150°C
ESD Classification …………………………………..… JEDEC, JESD22-A114
Moisture Sensitivity Level ……………………………. JEDEC Level 1 @ 260
o
C
Caution:
Stresses above those listed in “Absolute Maximum Rating” may cause permanent damage to the
device. These are stress ratings only and function of the device at these or any other conditions beyond those
indicated in the operational sections of the specifications is not implied. Exposure to “Absolute Maximum Rating”
conditions for extended periods may affect device reliability.
Package Information
V
CC
LDrv
PGnd
HDrv
V
C
1
2
3
4
5
10
9
OCSet
SS/SD
Gnd
Comp
Fb
Exposed Pad
8
7
6
10-Lead MLPD, 3x3mm
Θ
JA
= 33
o
C/W *
Θ
JC
= 2.1
o
C/W
*Exposed pad on underside is connected to a copper
pad through vias for 4-layer PCB board design
2
IR3624MPBF
Block Diagram
Vcc
3V
20uA
40uA
3V
Bias
Generator
3V
0.6V
Vc
Thermal
Shutdown
SS / SD
3uA
OCP
POR
UVLO
POR
HDrv
Vc
0.6V
Error Amp
PWM Comp
Vcc
R
Q
Fb
S
LDrv
Comp
0.3V
Oscillator
Set
R
Q
S
SS
POR
PBias
PGnd
Ramp
OCP
Gnd
20uA
OCSet
Fig. 2: Simplified block diagram of the IR3624
3
IR3624MPBF
Pin Description
Pin Name
1
Vcc
Description
This pin provides power for the internal blocks of the IC as well as powers
the low side driver. A minimum of 0.1uF, high frequency capacitor must
be connected from this pin to power ground.
Output driver for low side MOSFET
Power Ground. This pin serves as a separate ground for the MOSFET
drivers and should be connected to the system’s power ground plane.
Output driver for high side MOSFET
This pin powers the high side driver and must be connected to a voltage
higher than bus voltage. A minimum of 0.1uF, high frequency capacitor
must be connected from this pin to power ground.
Inverting input to the error amplifier. This pin is connected directly to the
output of the regulator via resistor divider to set the output voltage and
provide feedback to the error amplifier.
Output of error amplifier. An external resistor and capacitor network is
typically connected from this pin to ground to provide loop compensation.
Signal ground for internal reference and control circuitry.
Soft start / shutdown. This pin provides user programmable soft-start
function. Connect an external capacitor from this pin to ground to set the
start up time of the output voltage. The converter can be shutdown by
pulling this pin below 0.3V.
Current limit set point. A resistor from this pin to drain of low side
MOSFET will set the current limit threshold.
2
3
4
5
LDrv
PGnd
HDrv
Vc
6
Fb
7
8
9
Comp
Gnd
SS/SD
10
OCSet
4
IR3624MPBF
Recommended Operating Conditions
Symbol
V
cc
V
c
F
s
T
j
Definition
Supply Voltage
Supply Voltage
Operating Frequency
Junction Temperature
Min
4.5
10
-40
Max
14
28
660
125
Units
V
V
kHz
o
C
Electrical Specifications
Unless otherwise specified, these specification apply over V
cc
=V
c
=12V, 0
o
C<T
j
< 105
o
C
Parameter
Reference Voltage
Feedback Voltage
Accuracy
SYM
V
FB
Test Condition
Min
TYP
0.6
MAX
Units
V
0 C<Tj<105 C
o
o
-40 C<Tj<105 C,
Note1
o
o
-1.5
-2.5
+1.5
+1.5
%
%
Supply Current
V
CC
Supply Current
(Static)
V
CC
Supply Current
(Dynamic)
V
C
Supply Current
(Static)
V
C
Supply Current
(Dynamic)
I
CC(Static)
I
CC(Dynamic)
I
C(Static)
I
C(Dynamic)
SS=0V, No Switching
F
s
=600kHz, C
LOAD
=1.5nF
SS=0V, No Switching
F
s
=600kHz, C
LOAD
=1.5nF
6
10
3
17
8
15
6
25
mA
mA
mA
mA
Under Voltage Lockout
V
CC
-Start-Threshold
V
CC
-Stop-Threshold
V
CC
-Hysteresis
V
C
-Start-Threshold
V
C
-Stop-Threshold
V
C
-Hysteresis
V
CC
_UVLO(R)
V
CC
_UVLO(F)
V
C
_UVLO(R)
V
C
_UVLO(F)
Supply ramping up
Supply ramping down
Supply ramping up and down
Supply ramping up
Supply ramping down
Supply ramping up and down
4.0
3.7
0.15
3.1
2.85
0.15
540
Note2
0.25
0.2
600
1.25
4.4
4.1
0.3
3.5
3.25
0.25
660
V
V
V
V
V
V
kHz
V
Oscillator
Frequency
Ramp Amplitude
Min Duty Cycle
Min Pulse Width
Max Duty Cycle
F
S
V
ramp
D
min
D
min(ctrl)
D
max
Fb=1V
F
s
=600kHz,
Note2
F
s
=600kHz, Fb=0.5V
71
0
80
%
ns
%
Note1: Cold temperature performance is guaranteed via correlation using statistical quality control.
Not tested for production.
Note2: Guaranteed by Design but not tested for production.
5
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