IR3621F International Rectifier, IR3621F Datasheet - Page 6

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

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

SS2 / SD
SS1 / SD
Comp1
Comp2
IR3621 & (PbF)
BLOCK DIAGRAM
6
V
V
V
Sync
SEN1
SEN2
POR
Gnd
Fb1
Vcc
Fb2
REF
V
Rt
P2
0.8V
28uA
28uA
0.8V
64uA
64uA
Max
Error Amp1
Error Amp2
Figure 3 - IR3621Block Diagram
Ramp2
Ramp1
Mode
VcH1
VcH2
PGood / OVP
Regulator
PWM Comp1
PWM Comp2
0.8V
Two Phase
SS
Oscillator
www.irf.com
2
Generator
Control
Bias
0.3V
Mode
SS2
Set1
Set2
UVLO
Shutdown
Thermal
Reset Dom
Reset Dom
S
R
R
S
OVP
HDrv OFF / LDrv ON
POR
POR
Q
Q
Mode
POR
3V
0.8V
Mode
SS1
SS2
0.3V
SS1
Control
Hiccup
SS1
S
R
Q
SS2
3uA
3uA
POR
PBias2
PBias1
20uA
20uA
S
R
Q
PBias1
PGnd1
PGnd2
OCSet1
Hiccup
OCSet2
PGood
V
VcH1
V
LDrv1
VcH2
HDrv2
LDrv2
HDrv1
OUT3
CL