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International Rectifier Electronic Components Datasheet

IR3621PBF Datasheet

2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER

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Data Sheet No.PD60231 revA
IR3621 & (PbF)
2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH
OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
FEATURES
Dual Synchronous Controller with 180!
Out of Phase Operation
Configurable to 2-Independent Outputs or
Current Share Single Output
Voltage Mode Control
Current Sharing Using Inductor's DCR
Selectable Hiccup or Latched Current
Limit using MOSFET's RDS(on) sensing
Latched Over-Voltage Protection
Pre-Bias Start Up
Programmable Switching Frequency up to 500KHz
Two Independent Soft-Starts/Shutdowns
Precision Reference Voltage 0.8V
Power Good Output
External Frequency Synchronization
Thermal Protection
APPLICATIONS
Embedded Networking & Telecom Systems
Distributed Point-of-Load Power Architectures
2-Phase Power Supply
Graphics Card
DDR Memory Applications
DESCRIPTION
The IR3621 IC combines a dual synchronous buck control-
ler and drivers, providing a cost-effective, high performance
and flexible solution. The IR3621 operates in 2-Phase mode
to produce either 2-independent output voltages or current
share single output for high current application. The 180!
out-of-phase operation allows the reduction of input and
output capacitance.
Other key features include two independently programmable
soft-start functions to allow system level sequencing of out-
put voltages in various configurations. The pre-bias protec-
tion feature prevents the discharge of the output voltage and
possible damage to the load during start-up when a pre-
existing voltage is present at the output. Programmable
switching frequency up to 500KHz per phase allows flexibil-
ity to tune the operation of the IC to meet system level re-
quirements, and synchronization allows the simplification
of system level filter design. Protection features such as
selectable hiccup or latched current limit, and under voltage
lock-out are provided to give required system level security
in the event of a fault condition.
Vin Vin
Rt
Comp1
HDrv1
OCSet1
LDrv1
PGnd1
Comp2 IR3621
SS1 / SD
SS2 / SD
Gnd
HDrv2
OCSet2
LDrv2
PGnd2
Vin
Rt
Comp1
HDrv1
OCSet1
LDrv1
PGnd1
Vout
Comp2 IR3621
Vin
SS1 / SD
SS2 / SD
Gnd
HDrv2
OCSet2
LDrv2
PGnd2
Vout1
Vout2
Current share, single output configuration
2-independent output voltage configuration
Figure 1 - Typical application of IR3621 in current share single output and 2-independent output voltage configuration
PKG
DESIG
M
M
F
F
ORDERING INFORMATION
PART
NUMBER
IR3621M
IR3621MTR
IR3621F
IR3621FTR
LEADFREE
PART NUMBER
IR3621MPbF
IR3621MTRPbF
N/A
N/A
PIN
COUNT
32
32
28
28
PARTS
PER TUBE
73
------
50
------
PARTS
PER REEL
------
6000
------
2500
T&R
Orientation
Fig A
www.irf.com
1


International Rectifier Electronic Components Datasheet

IR3621PBF Datasheet

2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER

No Preview Available !

IR3621 & (PbF)
ABSOLUTE MAXIMUM RATINGS
Vcc, VCL Supply Voltage ........................................... -0.5V To 16V
VcH1 and VcH2 Supply Voltage ................................ -0.5V To 25V
PGOOD.................................................................... -0.5V To 16V
Storage Temperature Range ...................................... -55°C To 150°C
Junction Temperature Range ..................................... -40°C To 150°C
ESD Classification ................................................... JEDEC, JESD22-A114
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 specifica-
tions is not implied. Exposure to “Absolute Maximum Rating” conditions for extended periods may affect device reliability
RECOMMENDED OPERATING CONDITIONS
Parameter Definition
Min
Vcc Supply Voltage
5.5
VcH1,2 Supply Voltage
10
Fs Operating Frequency 200
Tj Junction Temperature -40
Max
14.5
20
500
125
Units
V
V
kHz
°C
PACKAGE INFORMATION
IR3621F
28-PIN TSSOP (F)
PGood 1
VCC 2
VOUT3 3
Rt 4
VSEN2 5
Fb2 6
Comp2 7
SS2 / SD 8
OCSet2 9
VcH2 10
HDrv2 11
PGnd2 12
LDrv2 13
VCL 14
28 Gnd
27 VREF
26 VP2
25 Hiccup
24 Sync
23 VSEN1
22 Fb1
21 Comp1
20 SS1 / SD
19 OCSet1
18 VcH1
17 HDrv1
16 PGnd1
15 LDrv1
θJA = 75.5 °C/W
θJC =13.3 °C/W
IR3621M & IR3621MPbF
32-Lead MLPQ 5mmx5mm (M)
32 31 30 29 28 27 26 25
Rt 1
24 Hiccup
VSEN2 2
23 Sync
Fb2 3
Comp2 4
SS2/SD2 5
Pad
22 VSEN1
21 Fb1
20 Comp1
OCSet2 6
19 SS1/SD1
VCH2 7
HDrv2 8
9
18 OCSet1
17 VcH1
10 11 12 13 14 15 16
θJA = 36.0 °C/W
θJC = 1.0 °C/W
Exposed pad on underside is connected to a copper
pad through vias for 4-layer PCB board design.
2 www.irf.com


Part Number IR3621PBF
Description 2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER
Maker International Rectifier
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