Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- DISSIPATION RATINGS
- RECOMMENDED OPERATING CONDITIONS
- ELECTRICAL CHARACTERISTICS
- DEVICE INFORMATION
- TYPICAL CHARACTERISTICS
- APPLICATION INFORMATION
- PWM Operations
- Adaptive On-Time Control and PWM Frequency
- Loop Compensation
- Ramp Signal
- Light Load Condition in Auto-Skip Operation
- Out-of-Audio™ Light-Load Operation
- Enable and Soft Start
- VREG5/VREG3 Linear Regulators
- VREG5 Switch Over
- VREG3 Switch Over
- Powergood
- Output Discharge Control
- Low-Side Driver
- High-Side Driver
- Current Protection
- Overvoltage and Undervoltage Protection
- UVLO Protection
- Thermal Shutdown
- External Parts Selection
- Layout Considerations
- Application Circuit
- Revision History

3.3-VOUTPUTVOLTAGE
vs
OUTPUTCURRENT
3.240
3.270
3.300
3.330
3.360
0.001 0.01 0.1 1 10
I
OUT2
-3.3-VOutputCurrent- A
V
OUT2
- 3.3-V Output Voltage - V
PWMOnly
Auto-skip
OOA
5-VOUTPUTVOLTAGE
vs
INPUTVOLTAGE
4.950
4.975
5.000
5.025
5.050
5.075
6 8 10 12 14 16 18 20 22 24 26
V
IN
-InputVoltage-V
V
OUT1
- 5-V Output Voltage - V
I
O
=0A
I
O
=6A
VREF OUTPUT VOLTAGE
vs
OUTPUT CURRENT
1.980
1.985
1.990
1.995
2.000
2.005
2.010
2.015
2.020
0 20 40 60 80 100
I
VREF
- VREF Output Current - mA
V
VREF
- VREF Output Voltage - V
5-V OUTPUT VOLTAGE
vs
OUTPUT CURRENT
4.950
4.975
5.000
5.025
5.050
5.075
0.001 0.01 0.1 1 10
I
OUT1
- 5-V Output Current - A
V
OUT1
- 5-V Output Voltage - V
PWM Only
Auto-skip
OOA
TPS51123
www.ti.com
SLUS890E –DECEMBER 2008–REVISED JANUARY 2013
TYPICAL CHARACTERISTICS (continued)
Figure 21. Figure 22.
Figure 23. Figure 24.
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