TPS51125

Description

The TPS51125 is a cost-effective, dual-synchronous buck controller targeted for notebook system power supply solutions. The device provides 5-V and 3.3-V LDOs and requires few external components. The 270-kHz VCLK output can be used to drive an external charge pump, thus generating gate drive voltage for the load switches without reducing the efficiency of the main converter. The TPS51125 supports high-efficiency, fast-transient response and provides a combined power-good signal. Out-of-Audio mode light-load operation enables low acoustic noise at much higher efficiency than conventional forced PWM operation. Adaptive on-time D-CAP control provides convenient and efficient operation. The part operates with supply input voltages ranging from 5.5 V to 28 V and supports output voltages from 2 V to 5.5 V. The TPS51125 is available in a 24-pin QFN package and is specified from –40°C to 85°C ambient temperature range.

Features

• Wide Input Voltage Range: 5.5 V to 28 V
• Output Voltage Range: 2 V to 5.5 V
• Built-In 100-mA, 5-V and 3.3-V LDO With Switches
• Built-In 1% 2-V Reference Output
• With or Without Out-of-Audio™ Mode Selectable 
  Light-Load and PWM-Only Operation
• Internal 1.6-ms Voltage Servo Soft-Start
• Adaptive On-Time Control Architecture With Four 
  Selectable Frequency Setting
• 4500 ppm/\xC2°C RDS(on) Current Sensing
• Built-In Output Discharge
• Powergood Output
• Built-In OVP/UVP/OCP
• Thermal Shutdown (Nonlatch)
• QFN, 24-Pin (RGE)
• APPLICATIONS
  • Notebook Computers
  • I/O Supplies
  • System Power Supplies

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Parametrics Compare all products in Step-Down (Buck) Controller

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Regulated Outputs (#)
Topology
Market Segment
Control Mode
Special Features
Rating
Operating Temperature Range (C)
Iout2 (A)
Pin/Package
Approx. Price (US$)

TPS51120	TPS51123	TPS51124	TPS51125A	TPS51220	TPS51220A
4.5	5.5	3	5.5	4.5	4.5
28	28	28	28	28	32
1	2	0.76	2	1	1
5.5	5.5	5.5	5.5	12	12
20	20	15	20	20	20
180	200	240	300	200	200
500	460	420	460	1000	1000
0.75	0.55	0.35	0.55	1.3	1.3
88	93	88	93	99	99
2	2	2	2	2	2
Buck	Buck	Buck	Buck	Buck	Buck
Mobile Computing	Mobile Computing	Mobile Computing	Mobile Computing	Mobile Computing	Mobile Computing
Current Mode D-CAP	D-CAP	D-CAP	D-CAP	Current Mode D-CAP	Current Mode D-CAP
Enable Power Good Light Load Efficiency Synchronous Rectification	Enable Power Good Light Load Efficiency Synchronous Rectification	Enable Power Good Light Load Efficiency Synchronous Rectification	Enable Light Load Efficiency Power Good Synchronous Rectification	Power Good Enable Frequency Synchronization Light Load Efficiency Phase Interleaving Synchronous Rectification	Power Good Enable Frequency Synchronization Light Load Efficiency Phase Interleaving Synchronous Rectification
Catalog	Catalog	Catalog	Catalog	Catalog	Catalog
-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
20	20	20	20	20	20
32VQFN	24VQFN	24VQFN	24VQFN	32VQFN	32QFN 32WQFN
2.31 | 1ku	1.95 | 1ku	1.94 | 1ku