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PDF IR3628MPBF Data sheet ( Hoja de datos )
| Número de pieza | IR3628MPBF | |
| Descripción | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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Data Sheet No PD94725
www.DataSheet4U.com
IR3628MPbF
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 RDS(on)
sensing
• Tracking for memory application
• Precision Reference Voltage (0.6V)
• Programmable Soft-Start
• Pre-Bias Start-up
• Thermal Protection
• 12-Lead 3x4mm MLPD Package
Applications
• DDR Application
• Storage Systems
• Embedded Telecom Systems
• Distributed Point of Load Power Architectures
• Computing Peripheral Voltage Regulator
• Graphics Card
• General DC/DC Converters
Description
The IR3628 is a PWM controller designed for
high performance synchronous Buck DC/DC
applications. The IR3628 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. IR3628
provides an efficient solution for high-speed
bandwidth data bus which requires a particular
tracking scheme for best performance using the
uncommitted error amplifier.
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.
08/10/2007
Fig. 1: Typical application Circuit
ORDERING INFORMATION
PKG PACKAGE
DESIG DESCRIPTION
M IR3628MPBF
M IR3628MTRPBF
PIN
COUNT
12
12
PARTS
PER TUBE
122
--------
PARTS
PER REEL
-------
3000
T&R
ORIANTAION
Figure A
1 page  
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IR3628MPbF
Recommended Operating Conditions
Symbol
Definition
Min
Vcc Supply Voltage
Vc Supply Voltage
Tj* Junction Temperature
*The junction Temperature for 5V application is 0oC-125oC
4.5
Converter voltage + 5
-40
Max
14
28
125
Electrical Specifications
Unless otherwise specified, these specification apply over Vcc=Vc=12V, 0oC<Tj< 105oC
Parameter
SYM
Test Condition
Min TYP
Voltage Accuracy
Feedback Voltage
Accuracy
VFB
0oC<Tj<105oC
-40oC<Tj<105oC, Note1
0.6
-1.5
-2.5
Units
V
V
oC
MAX Units
+1.5
+1.5
V
%
%
Supply Current
VCC Supply Current
(Static)
VCC Supply Current
(Dynamic)
VC Supply Current
(Static)
VC Supply Current
(Dynamic)
ICC(Static)
ICC(Dynamic)
IC(Static)
IC(Dynamic)
SS=0V, No Switching
Fs=600kHz, CLOAD=1.5nF
SS=0V, No Switching
Fs=600kHz, CLOAD=1.5nF
10 13
15 25
4.5 7
17 25
mA
mA
mA
mA
Under Voltage Lockout
VCC-Start-Threshold
VCC-Stop-Threshold
VCC-Hysteresis
VC-Start-Threshold
VC-Stop-Threshold
VC-Hysteresis
VCC_UVLO(R)
VCC_UVLO(F)
VC_UVLO(R)
VC_UVLO(F)
Oscillator
Frequency
Ramp Amplitude
FS
Vramp
Min Duty Cycle
Min Pulse Width
Max Duty Cycle
Dmin
Dmin(ctrl)
Dmax
Supply ramping up
Supply ramping down
Supply ramping up and down
Supply ramping up
Supply ramping down
Supply ramping up and down
Note2
Fb=1V
Fs=600kHz, Note2
Fs=600kHz, Fb=0.5V
4.0
3.7
0.15
3.1
2.85
0.15
540
71
4.2
.9
0.25
3.3
3.05
0.2
600
1.25
4.4
4.1
0.3
3.5
3.25
0.25
660
0
80
V
V
V
V
V
V
kHz
V
%
ns
%
Note1: Cold temperature performance is guaranteed via correlation using statistical quality control.
Not tested in production.
Note2: Guaranteed by Design but not tested in production.
08/10/2007
5
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Application Information
Design Example:
The following example is a typical application for
IR3628. The application circuit is shown in
page18.
Vin = 12V,(13.2V,max )
Vo = 0.9V
Io = 10A
ΔVo ≤ 30mV (Output Voltage Ripple)
Output Voltage Programming
Output voltage is programmed by reference
voltage and external voltage divider. The Fb pin
is the inverting input of the error amplifier, which
is internally referenced to 0.6V. The divider is
ratioed to provide 0.6V at the Fb pin when the
output is at its desired value. The output voltage
is defined by using the following equation:
Vo
= Vref
∗ ⎜⎜⎝⎛1 +
R8
R9
⎟⎟⎠⎞
--( 4 )
When an external resistor divider is connected to
the output as shown in figure 10.
IRIR33662248
Fb
VOUT
R8
R9
Fig. 10: Typical application of the IR3628 for
programming the output voltage
Equation (4) can be rewritten as:
R9
=
R8
∗
⎜⎜⎝⎛
V
Vref
−VO ref
⎟⎟⎠⎞
--(5 )
For tracking applications replace Vref to Vp in
equation (5).
For the calculated values of R8 and R9 see
feedback compensation section.
08/10/2007
IR3628MPbF
Soft-Start Programming
The soft-start timing can be programmed by
selecting the soft-start capacitance value. The
start-up time of the converter can be calculated
by using:
CSS ≅ 20μA *Tstart --(1)
Where Tstart is the desired start-up time (ms)
For a start-up time of 10ms, the soft-start
capacitor will be 0.2uF. Choose a ceramic
capacitor at 0.22uF.
Vc supply for single input voltage
To drive the high side switch, it is necessary to
supply a gate voltage at least 4V grater than the
bus voltage. This is achieved by using a charge
pump configuration as shown in figure 11. This
method is simple and inexpensive. The operation
of the circuit is as follows: when the lower
MOSFET is turned on, the capacitor (C1) is
pulled down to ground and charges, up to VBUS
value, through the diode (D1). The bus voltage
will be added to this voltage when upper
MOSFET turns on in next cycle, and providing
supply voltage (Vc) through diode (D2). Vc is
approximately:
( )VC ≅ 2 ∗Vbus − VD1 +VD2 --(6 )
Capacitors in the range of 0.1uF is generally
adequate for most applications. The diodes must
be a fast recovery device to minimize the amount
of charge fed back from the charge pump
capacitor into VBUS. The diodes need to be able
to block the full power rail voltage, which is seen
when the high side MOSFET is switched on. For
low voltage application, schottky diodes can be
used to minimize forward drop across the diodes
at start up.
VBUS
D1
C3
D2
Vc
C2
VBUS
C1 Q1
L
IRIR33662284 HDrv Q2
Fig. 11: Charge pump circuit to generate
Vc voltage
11
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