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IR3475 Datasheet(PDF) 7 Page - International Rectifier

Part # IR3475
Description  10A Highly Integrated SupIRBuck Constant On.Time Control
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3475 Datasheet(HTML) 7 Page - International Rectifier

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March 27, 2013  |  V2.2  |  PD97602
7
IR3475 
10A Highly Integrated SupIRBuck
TM 
ELECTRICAL SPECIFICATIONS 
RECOMMENDED OPERATING CONDITIONS FOR RELIABLE OPERATION WITH MARGIN 
 
SYMBOL 
MIN 
MAX 
UNITS
Recommended VIN Range 
VIN 
27* 
Recommended VCC Range 
VCC 
4.5 
5.5 
Recommended Output Voltage Range 
VOUT 
0.5 
12 
Recommended Output Current Range 
IOUT 
10 
Recommended Switching Frequency 
FS 
N/A 
750 
kHz 
Recommended Operating Junction Temperature 
TJ ‐40 
125 
°C 
* PHASE pin must not exceed 30V. 
ELECTRICAL CHARACTERISTICS 
Unless otherwise specified, these specifications apply over VIN = 12V, 4.5V < VCC < 5.5V, 0°C ≤ TJ ≤ 125°C. 
PARAMETER 
SYMBOL 
CONDITIONS 
MIN 
TYP 
MAX 
UNIT 
Control Loop 
Reference Accuracy 
VREF 
VFB = 0.5V 
0.495 
0.5 
0.505 
On‐Time Accuracy   
RFF = 180K, TJ = 65°C 
280 
300 
320 
ns 
Min. Off Time   
  
  
500 
580  
ns 
Soft‐Start Current   
EN = High 
10 
12 
µA 
DCM Comparator Offset   
Measure at VPHASE ‐4.5 ‐2.5 
mV  
Feedback Input Current  
VFB = 0.5V, TA = 25°C, Note 1  
0.01 
0.2 
µA 
Supply Current 
VCC Supply Current (standby)   
EN = Low, No Switching   
23   
µA 
VCC Supply Current (dynamic)  
EN = High, FS = 300kHz   
7   
mA 
FF Shutdown Current   
EN = Low, RFF = 180K  
  
µA 
Forced Continuous Conduction Mode (FCCM) 
FCCM Start Threshold 
  
  
  
  
FCCM Stop Threshold 
  
  
  
  
0.6 
Gate Drive 
Deadtime   
Monitor body diode 
conduction on PHASE pin, 
Note 1 
5  
30 
ns 
Bootstrap PFET 
Forward Voltage 
 
I(BOOT) = 10mA  
300  
mV 
Upper MOSFET 
Static Drain‐to‐Source On‐Resistance   
VCC = 5V, ID = 10A, TJ = 25°C  
25 
32 
mΩ 
Lower MOSFET  
Static Drain‐to‐Source On‐Resistance   
VCC = 5V, ID = 10A, TJ = 25°C 
 
13 
17 
mΩ 


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