IR3621F International Rectifier, IR3621F Datasheet

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IR3621F

Manufacturer Part Number
IR3621F
Description
IC PWM DUAL SYNC PREBIAS 28TSSOP
Manufacturer
International Rectifier
Datasheet

Specifications of IR3621F

Pwm Type
Voltage Mode
Number Of Outputs
2
Frequency - Max
345kHz
Duty Cycle
86.5%
Voltage - Supply
5.5 V ~ 14.5 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
-40°C ~ 125°C
Package / Case
28-TSSOP
Frequency-max
345kHz
Package
28-Pin TSSOP
Circuit
Dual Sync PWM Controller or 2Phase Single Output
Vcc (min)
4.7
Vcc (max)
16
Vout (min)
0.8
Vout (max)
Vcc * 0.90
Switch Freq (khz)
programmable to 500kHz
Pbf
PbF Option Available
For Use With
IRDC3621 - BOARD EVAL DUAL SYNC BUCK CTRLR
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
IR3621F
Manufacturer:
IR
Quantity:
20 000
Part Number:
IR3621FTR
Manufacturer:
IOR
Quantity:
7 504
FEATURES
APPLICATIONS
Figure 1 - Typical application of IR3621 in current share single output and 2-independent output voltage configuration
Embedded Networking & Telecom Systems
Distributed Point-of-Load Power Architectures
2-Phase Power Supply
Graphics Card
DDR Memory Applications
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 R
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
DESIG
PKG
M
M
F
F
Current share, single output configuration
2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH
OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
Rt
Comp1
SS1 / SD
SS2 / SD
Comp2
Gnd
PART
NUMBER
IR3621M
IR3621MTR IR3621MTRPbF
IR3621F
IR3621FTR
IR3621
OCSet1
OCSet2
PGnd2
PGnd1
HDrv1
HDrv2
LDrv1
LDrv2
DS(on)
LEADFREE
PART NUMBER
IR3621MPbF
IR3621FPbF
IR3621FTRPbF
sensing
Vin
Vin
ORDERING INFORMATION
COUNT
www.irf.com
PIN
Vout
32
32
28
28
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.
2-independent output voltage configuration
PER TUBE
PARTS
------
------
Rt
Comp1
Comp2
SS1 / SD
SS2 / SD
Gnd
73
50
IR3621
OCSet1
OCSet2
PGnd1
PGnd2
HDrv1
LDrv1
HDrv2
LDrv2
Data Sheet No.PD60231 revB
PER REEL
PARTS
IR3621 & (PbF)
6000
2500
------
------
Vin
Vin
Orientation
T & R
Fig A
Vout1
Vout2
1

Related parts for IR3621F

IR3621F Summary of contents

Page 1

... IR3621MTR IR3621MTRPbF F IR3621F IR3621FPbF F IR3621FTR IR3621FTRPbF 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 ...

Page 2

... Exposure to “Absolute Maximum Rating” conditions for extended periods may affect device reliability RECOMMENDED OPERATING CONDITIONS Parameter Definition Vcc Supply Voltage VcH1,2 Supply Voltage Fs Operating Frequency Tj Junction Temperature -40 PACKAGE INFORMATION IR3621F 28-PIN TSSOP (F) PGood Gnd REF V ...

Page 3

ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over Vcc=12V, VcH1=VcH2=V PARAMETER SYMBOL Output Voltage Accuracy Feedback Voltage Accuracy UVLO Section UVLO Threshold - Vcc UVLO Hysteresis - Vcc UVLO Threshold - VcH1,2 UVLO UVLO Hysteresis - VcH1,2 Supply Current ...

Page 4

IR3621 & (PbF) PARAMETER V Internal Regulator OUT3 Output Voltage Output Current Protection Section OVP Trip Threshold OVP Fault Prop Delay OVP OCSET Current Hiccup Duty Cycle Hiccup High Level Threshold Hiccup Low Level Threshold Thermal Shutdown Trip Point Thermal ...

Page 5

PIN DESCRIPTIONS TSSOP MLPQ PIN SYMBOL 1 PGood 29 2 Vcc OUT3 5, 2,22 SEN2 SEN1 6,22 Fb2,Fb1 3,21 7,21 Comp2, Comp1 4,20 8 SS2 / SS1 ...

Page 6

IR3621 & (PbF) BLOCK DIAGRAM Vcc 28uA 28uA 64uA Max SS2 / SD 64uA SS1 / SD POR Error Amp1 0.8V Fb1 Comp1 Rt Sync 0.8V V REF Error Amp2 V P2 Fb2 Comp2 V SEN1 V SEN2 Gnd 6 ...

Page 7

FUNCTIONAL DESCRIPTION Introduction The IR3621 is a versatile device for high performance buck converters. It consists of two synchronous buck controllers which can be operated either in two indepen- dent mode or in current share mode. The timing of the ...

Page 8

IR3621 & (PbF) Dual Soft-Start The IR3621 has programmable soft-start to control the output voltage rise and limit the inrush current during start-up. It provides a separate Soft-Start function for each outputs. This will enable to sequence the outputs by ...

Page 9

For a given start up time, the soft-start capacitor can be calculated by: C 28µA×T SS START The soft-start is part of the Over Current Protection scheme, during the overload or short circuit condition the external soft start capacitors will ...

Page 10

IR3621 & (PbF) Frequency Synchronization The IR3621 is capable of accepting an external digital synchronization signal. Synchronization will be enabled by the rising edge at an external clock. Per-channel switch- ing frequency is set by external resistor (Rt). The free ...

Page 11

APPLICATION INFORMATION Design Example: The following example is a typical application for the IR3621, the schematic is Figure19 on page18 12V 2.5V @ 10A OUT(2.5V 1.8V @ 10A OUT(1.8V) ∆V = Output voltage ...

Page 12

IR3621 & (PbF) Input Capacitor Selection The 180 0 out of phase will reduce the RMS value of the ripple current seen by input capacitors. This reduces numbers of input capacitors. The input capacitors must be selected that can handle ...

Page 13

The gate drive requirement is almost the same for both MOSFETs. Logic-level transistors can be used and cau- tion should be taken with devices at very low V vent undesired turn-on of the complementary MOSFET, which results in a shoot-through. ...

Page 14

IR3621 & (PbF) Feedback Compensation The IR3621 is a voltage mode controller; the control loop is a single voltage feedback path including error ampli- fier and error comparator. To achieve fast transient re- sponse and accurate output regulation, a compensation ...

Page 15

OSC ESR 5 9 × × Where Maximum Input Voltage Oscillator Ramp Voltage OSC F = Crossover Frequency ...

Page 16

IR3621 & (PbF ×C 2π× × × 2π× ×C 2π× ...

Page 17

Select a zero crossover frequency for control loop (F 1.25 times larger than zero crossover frequency for volt- age loop ( 1.25% ×R ×R × H(Fo 2π×Fo×L From ...

Page 18

IR3621 & (PbF) TYPICAL APPLICATION 12V PGood C10 C15 Figure 19 - Typical application of IR3621. 12V input and two independent outputs using type 2 compensation. 18 C12 VcH2 C13 V ...

Page 19

TYPICAL APPLICATION 12V Vcc C5 Hiccup Sync Comp1 R4 C9 Comp2 PGood C10 Figure 20 - 2-phase operation with inductor current sensing using type 2 compensation. C12 C13 VcH1 V VcH2 CL ...

Page 20

IR3621 & (PbF) TYPICAL OPERATING CHARACTERISTICS Vfb1 vs. Temperature 0.8060 0.8040 0.8020 0.8000 0.7980 0.7960 0.7940 - Temperature [C] VOUT3 vs. Temperature 6.24 6.22 6.2 6.18 6.16 6.14 6.12 6.1 -50 - Temperature (C) SS ...

Page 21

TYPICAL OPERATING CHARACTERISTICS Static Supply Current vs. Temperature 30 25 ICC ICH1+ICH2 -50 - Temperature (C) IOCSet vs. Temperature -50 -25 ...

Page 22

IR3621 & (PbF) TYPICAL OPERATING WAVEFORMS Test Conditions: V =12V, V =2.5V, I =0-10A OUT1 OUT1 Unless otherwise specified. Figure 21 - Start up waveforms for 2.5V output Ch1: Vin, Ch2: Vout3, Ch3: SS1, Ch4:Vo1 (2.5V) Figure 23 ...

Page 23

TYPICAL OPERATING WAVEFORMS Test Conditions: V =12V, V =2.5V, I =0-10A OUT1 OUT1 Unless otherwise specified. Figure 25 - 2.5V output Ch1: Vin, Ch2: SS1, Ch3: Vo1, Ch4: PGood Figure 27 - Gate waveforms with 180 out of ...

Page 24

IR3621 & (PbF) TYPICAL OPERATING WAVEFORMS Test Conditions: V =12V, V =2.5V, I =0-10A OUT1 OUT1 Unless otherwise specified. Figure 29 - 2.5V Waveforms Ch1: Hdrv2, Ch2: Ldrv2, Ch3: Lx2, Ch4: Inductor Current Figure 31 - 2.5V output ...

Page 25

TYPICAL OPERATING WAVEFORMS Test Conditions: V =12V, V =2.5V, I =0-10A OUT1 OUT1 Unless otherwise specified. Figure 33 - SS1 pin shorted to Gnd Ch1: SS1, Ch2: Hdrv1, Ch3: Ldrv1, Ch4:Vo2 Ch1: External Clock, Ch2: Hdrv1, Ch3: Hdrv2 ...

Page 26

IR3621 & (PbF) TYPICAL OPERATING WAVEFORMS Test Conditions: V =12V, V =2.5V, I =0-10A OUT1 OUT1 Unless otherwise specified. Figure 36 - Load Transient Respons for Vo1 (Io=0 to 10A) Ch1: Vo1, Ch4:Io1 Figure 38 - Load Transient ...

Page 27

TYPICAL PERFORMANCE CURVES Test Conditions: V =12V, V =2.5V, I =0-10A OUT1 OUT1 Unless otherwise specified Figure 40 - Efficiency for 2.5V and 1.8V outputs ...

Page 28

IR3621 & (PbF) (IR3621M & IR3621MPbF) MLPQ 5x5 Package D D/2 PIN 1 MARK AREA (See Note1) TOP VIEW SIDE VIEW 28 32-Pin E/2 E BOTTOM VIEW Note 1: Details of pin #1 are optional, but must be located within ...

Page 29

... TSSOP Package A 1.0 DIA E PIN NUMBER 28-PIN SYMBOL MIN NOM DESIG 0.65 BSC A 4.30 4. 6.40 BSC 0.19 --- D 1.00 E 1.00 F 9.60 9.70 G --- --- H 0.85 0.90 J 0.05 --- REF 12 REF M 0 --- N 1.00 REF O 0.50 0. 0.20 0.09 --- R 0.09 --- R1 NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 This product has been designed and qualified for the Industrial market ...

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