PD97401
IR3640MPBF
HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER
Features
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4.5V to 5.5V external supply
Wide Input voltage from 1.5V to 24V
Output voltage range: 0.7V to 0.9*Vin
Programmable switching frequency up to 1.5MHz
Programmable Soft-start
Hiccup mode over current protection using Rds(on)
sensing
Programmable OCP
Reference voltage 0.7V (+/-1%, 0
o
C <Tj<125
o
C)
Enhanced Pre-bias start up
Output voltage tracking
Integrated MOSFET drivers and bootstrap diode
Operating temp: -40
o
C <Tj<125
o
C
External synchronization
Power Good output
Thermal shut down
Over voltage protection
Enable Input with voltage monitoring capability
Pb-Free & Halogen-Free (RoHS Compliant)
20 -Lead MLPQ package (3mmx4mm)
Point of Load Power Architectures
Server & Netcom Applications
Game Consoles
General DC/DC Converters
Description
The IR3640M is a synchronous Buck PWM controller
designed
for
performance
The
single
demanding
loop
voltage
DC/DC
mode
applications.
architecture simplifies design while delivery precise
output voltage regulation and fast transient response.
Because of its wide input and output voltage range it
can be used in a large variety of point of load
applications within a system and across different
markets.
The part is designed to drive a pair of N-Channel
MOSFETs
from
250kHz
to
1.5Mhz
switching
frequency giving designers the flexibility to optimize
the solution for best efficiency or smallest footprint.
The output voltage can be precisely regulated from as
low as 0.7V within a tolerance of +/-1% over
temperature, line and load variations.
The device also integrates a diversity of features
including; programmable soft start, pre-bias start up,
voltage tracking, external synchronization, enable
input and Power Good output.
Fault protection
features include thermal shutdown, over voltage and
over current shutdown and under voltage lock out.
Applications
Typical Application
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1
IR3640MPBF
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND unless otherwise specified)
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Vcc and PVcc ……………….….…………….……..……. -0.3V to 8V
(Note2)
Boot
SW
……………………………………..……….…….... -0.3V to 40V
…………………………………………..………..... -4V (100ns), -0.3V(DC) to 31V
……..…………………………….…..……... -0.3V to Vcc+0.3V
(Note1)
Boot to SW
LDrv to PGND ………………………………….………….. -0.3V to Vcc+0.3V
(Note1)
HDrv to SW ……………………………………….……….. -0.3V to BOOT+0.3V
(Note1)
OCSet
………………………………………….……….. -0.3V to 30V, 30mA
…………………………………......... -0.3V to Vcc+0.3V
(Note1)
Input / output Pins
PGND to GND ……………...…………………………….. -0.3V to +0.3V
Storage Temperature Range .......................................... -55°C To 150°C
Junction Temperature Range ......................................... -40°C To 150°C
(Note2)
ESD Classification …………………………….………….. JEDEC Class 1C
Moisture sensitivity level………………...………………… JEDEC Level 2@260 °C
Note1:
Must not exceed 8V
Note2:
Vcc must not exceed 7.5V for Junction Temperature between -10
o
C and -40
o
C
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
20-Lead MLPQ
(3x4)mm
Θ
JA
= 36
o
C/W *
Θ
JC
= 4
o
C/W
*Exposed pad on underside
is connected to a copper
pad through vias for 4-layer
PCB board design
Ordering Information
PKG DESIG
M
06/15/2009
PACKAGE
DESCRIPTION
IR3640MTRPbF
PIN COUNT
20
PARTS PER
REEL
3000
2
IR3640MPBF
Fig. 2. Simplified block diagram of the IR3640
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IR3640MPBF
Pin Description
Pin
Number
Pin Name
NC
LDrv
PGnd
SW
HDrv
NC
Boot
Enable
Seq
Fb
Vsns
Comp
Gnd
Rt
SS/SD
OCset
PGood
Sync
Vcc
PVcc
No Connect
Description
1
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3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Output driver for Low-side MOSFET
Power Ground
Switch Node
Output driver for High-side MOSFET
No Connect
Supply Voltage for High-side Driver
User programmable Enable
Sequence. If it is not used connect to Vcc
Inverting Pin of E/A
OVP / PGood Sense
Output of Error Amplifier
IC Ground
Set the Switching Frequency
Soft Start/Shutdown
External Resistor connection to set the
Over Current Limit
Power Good Output. Open Drain
External Synchronization
Supply Voltage for IC Bias
Supply Voltage for Driver section
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IR3640MPBF
Recommended Operating Conditions
Symbol
Vcc and PVcc
Fs
Tj
Definition
Supply voltages
Operating frequency
Junction temperature
Min
4.5
225
-40
Max
5.5
1650
125
Units
V
kHz
o
C
Electrical Specifications
Unless otherwise specified, these specification apply over 4.5V<V
cc
<5.5V, 0
o
C<T
j
<125
o
C
Typical values are specified at 25
o
C
Parameter
Voltage Accuracy
Regulated voltage at Fb
Accuracy
VFb
0 C<Tj<125 C
-40 C<Tj<125 C,
Note3
o
o
o
o
SYM
Test Condition
Min
TYP
MAX
Units
0.7
-1.0
-2
+1.0
V
%
+2
Supply Current
V
cc
Supply Current
(Standby)
V
cc
Supply Current
(Dyn)
V
cc
Supply current
I
cc
(Standby)
I
cc
(Dynamic)
I
bias
No Switching, Enable low
Vcc=5V, Freq=600kHz,
Enable high, C
LOAD_H
=2.2nF
C
LOAD_L
=4.4nF
Vcc=5V, Freq=600kHz,
Enable high, Cload=Open
500
40
mA
6
μA
Under Voltage Lockout / Enable
Vcc-Threshold-Start
Vcc-Threshold-Stop
Vcc-Hysteresis
Enable Threshold-Start
Enable Threshold-Stop
Enable-Hysteresis
Enable
Current
Leakage
Vcc_UVLO_Start
Vcc_UVLO_Stop
Vcc-Hys
En_UVLO_Start
En_UVLO_Stop
En_Hys
Ien
Enable=3.3V
Enable Rising Trip Level
Enable Falling Trip Level
Vcc Rising Trip Level
Vcc Falling Trip Level
4.06
3.76
0.25
1.14
0.9
0.16
4.26
3.96
0.3
1.2
1.0
0.20
4.46
4.16
0.38
V
1.36
1.06
0.25
18
μA
Oscillator
Rt Voltage
Frequency
F
S
Rt=59K
Rt=28.7K
Rt=9.31K
0.665
225
450
1350
0.7
250
500
1500
1.8
0.6
0.735
275
550
1650
V
kHz
Vp-p
V
Ramp Amplitude
Ramp Offset
Vramp
Ramp (os)
Note4
Note4
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