Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- CONTENTS
- DESCRIPTION
- DEVICE RATINGS
- ABSOLUTE MAXIMUM RATINGS
- RECOMMENDED OPERATING CONDITIONS
- ELECTROSTATIC DISCHARGE (ESD) PROTECTION
- PACKAGE DISSIPATION RATINGS
- ELECTRICAL CHARACTERISTICS
- TYPICAL CHARACTERISTICS
- DEVICE INFORMATION
- BLOCK DIAGRAM
- APPLICATION INFORMATION
- FUNCTIONAL DESCRIPTION
- Voltage Reference
- Oscillator
- Input Undervoltage Lockout (UVLO) and Startup
- Enable and Timed Turn On of the Outputs
- Output Voltage Sequencing
- Soft Start
- Output Voltage Regulation
- Feedback Loop and Inductor-Capacitor (L-C) Filter Selection
- Inductor-Capacitor (L-C) Selection
- Maximum Output Capacitance
- Minimum Output Capacitance
- Modifying The Feedback Loop
- Example: TPS54386 Buck Converter Operating at 12-V Input, 3.3-V Output and 400-mA(P-P) Ripple Current
- Bootstrap for the N-Channel MOSFET
- Light Load Operation
- SW Node Ringing
- Output Overload Protection
- Operating Near Maximum Duty Cycle
- Dual Supply Operation
- Cascading Supply Operation
- Multiphase Operation
- Bypass and FIltering
- Over-Temperature Protection and Junction Temperature Rise
- Power Derating
- PowerPAD Package
- PCB Layout Guidelines
- FUNCTIONAL DESCRIPTION
- DESIGN EXAMPLES
- ADDITIONAL REFERENCES

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50
200
250
300
350
400
100
0 0.2 0.4 0.6 0.8 1.0 1.4
T
A
= 0°C
I
L
- Load Current - A
t
ON
- Minimum Controllable Pulse Width - ns
–40
0
25
85
T
A
(°C)
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
1.2
150
-50 -25 0 25 50 75 100 125
T
J
- Junction Temperature - °C
I
SW(off)
- Switching Node Leakage Current - mA
2
3
1
4
5
4 8 12 16 20 24 28
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
OCL = 4.5 A
OCL = 3.0 A
OCL = 1.5 A
V
DD
- Supply Voltage - V
I
OC
- Overcurrent Limit - A
TPS54383 , , TPS54386
SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007
TYPICAL CHARACTERISTICS (continued)
SWITCHING NODE LEAKAGE CURRENT MINUMUM CONTROLLABLE PULSE WIDTH
vs vs
JUNCTION TEMPERATURE LOAD CURRENT
Figure 13. Figure 14.
OVERCURRENT LIMIT
vs
SUPPLY VOLTAGE
Figure 15.
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Product Folder Link(s): TPS54383 TPS54386