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PDF IR3629A Data sheet ( Hoja de datos )
| Número de pieza | IR3629A | |
| Descripción | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER | |
| Fabricantes | International Rectifier | |
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Data Sheet No. PD94726
www.DataSheet4U.com
IR3629/IR3629A MPbF
HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER
WITH POWER GOOD OUTPUT
Features
• Internal 600kHz Oscillator (300kHz “A version”)
• Operates with Single 5V or 12V Supply
• Programmable Over Current Protection
• Hiccup Current Limit Using MOSFET RDS(on)
sensing
• Precision Reference Voltage (0.6V)
• Programmable Soft-Start
• Programmable PGood output
• Pre-Bias Start-up
• Thermal Protection
• 12-Lead MLP Package
Applications
• Distributed Point-of-Loads
• Embedded Systems
• Storage Systems
• DDR Applications
• Graphics Cards
• Computing Peripheral Voltage Regulators
• General DC-DC Converters
Description
The IR3629/IR3629A is a PWM controller
designed for high performance synchronous Buck
DC/DC applications. The IR3629/IR3629A drives
a pair of external N-MOSFETs using a fixed
600kHz (300kHz “A version”) 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
provide the required system level security in the
event of fault conditions.
11/26/2007
Fig. 1: Typical application Circuit
ORDERING INFORMATION
PKG PACKAGE
PIN
DESIG DESCRIPTION
COUNT
M IR3629/IR3629AMPBF 12
M IR3629/IR3629AMTRPBF 12
PARTS
PARTS
T&R
PER TUBE PER REEL ORIENTATION
122 -------
-------- 3000 Figure A
1 page  
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IR3629/IR3629A MPbF
Recommended Operating Conditions
Symbol
Definition
Min
Max
Vcc
Vc
Tj (Note1)
Supply Voltage
Supply Voltage
Junction Temperature
4.5
Converter voltage + 5V
-40
14
28
125
Note1:
The junction temperature for 5V application is 0oC-125oC
Electrical Specifications
Unless otherwise specified, these specification apply over Vcc=Vc=12V, 0oC<Tj< 105oC
Typical value are specified at Ta=25oC
Units
V
V
oC
Parameter
SYM
Test Condition
Min TYP MAX Units
Accuracy
Feedback Voltage
Accuracy
VFB
0oC<Tj<125oC
-40oC<Tj<105oC, Note2
0.6
-1.5
-2.5
+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
IR3629, CLOAD=1.5nF
IR3629A, CLOAD=1.5nF
SS=0V, No Switching
IR3629, CLOAD=1.5nF
IR3629A, CLOAD=1.5nF
10 13
15 25
15 19
4.5 7
17 25
10 15
mA
Under Voltage Lockout
VCC-Start-Threshold
VCC-Stop-Threshold
VCC-Hysteresis
VC-Start-Threshold
VC-Stop-Threshold
VC-Hysteresis
VCC_UVLO(R) Supply ramping up
4.0 4.2
VCC_UVLO(F) Supply ramping down
3.7 3.9
VCC_Hys
Supply ramping up and down 0.15 0.25
VC_UVLO(R) Supply ramping up
3.1 3.3
VC_UVLO(F) Supply ramping down
2.85 3.05
VC_Hys
Supply ramping up and down 0.15 0.2
Oscillator
Frequency
FS IR3629A
IR3629
270 300
540 600
Ramp Amplitude
Vramp
Note3
1.25
Min Duty Cycle
Min Pulse Width
Dmin
Dmin(ctrl)
Fb=1V
IR3629, Note3
IR3629A , Note3
Max Duty Cycle
Dmax
IR3629, Fb=0.5V
IR3629A, Fb=0.5V
71
78
4.4
4.1
0.3
3.5
3.25
0.25
330
660
0
80
160
V
kHz
V
%
ns
%
11/26/2007
5
5 Page 
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Application Information
Design Example:
The following example is a typical application for
IR3629. The application circuit is shown on page
18.
Vin=12V,(13.2V,max )
Vo=1.5V
Io=12 A
ΔVo≤30mV(output voltage ripple)
Fs=600 kHz
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.
IRIR33662249
Fb
VOUT
R8
R9
Fig. 10: Typical application of the IR3629 for
programming the output voltage
Equation (4) can be rewritten as:
R9
=
R8
∗
⎜⎜⎝⎛
V
Vref
−VO ref
⎟⎟⎠⎞
--(5 )
For the calculated values of R8 and R9 see
feedback compensation section.
11/26/2007
IR3629/IR3629A MPbF
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 greater 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 the upper
MOSFET turns on in the next cycle, and
providing supply voltage (Vc) through diode (D2).
Vc is approximately:
( )VC ≅ 2 ∗Vbus − VD1 +VD2 --(6 )
A capacitors in the range of 0.1uF is generally
adequate for most applications. Fast recovery
diodes must be used 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 applications, schottky diodes can be
used to minimize forward drop.
VBUS
IRIR3632692/249A
D1
C3
D2
Vc
C2
VBUS
C1 Q1
L
HDrv Q2
Fig. 11: Charge pump circuit to generate
Vc voltage
11
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| PDF Descargar | [ Datasheet IR3629A.PDF ] | |
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