Overview
The TPS61251DSGT, produced by Texas Instruments, is a high-efficiency boost converter designed for battery backup charging and other applications requiring adjustable constant current and low quiescent current. This device is ideal for portable applications such as mobile phones, solid-state drives (SSD), and wireless modems. It operates with a wide input voltage range from 2.3 V to 6 V and can be programmed to output voltages up to 6.5 V. The TPS61251 features a quasi-constant frequency adaptive on-time controller, ensuring high efficiency and minimal output voltage ripple.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VIN Range | 2.3 | - | 6 | V |
| VOUT Range | - | - | 6.5 | V |
| Input Current Limit | 100 mA | - | 1500 mA | - |
| Current Accuracy | - | ±10% at 500 mA | - | - |
| Oscillator Frequency | - | 3.5 MHz | - | - |
| Efficiency | - | Up to 92% | - | - |
| Quiescent Current in Snooze Mode | - | 2 μA | - | - |
| Package Type | - | WSON-8 | - | - |
| Operating Junction Temperature | -40 | - | 125 | °C |
Key Features
- Programmable input current limit with ±10% accuracy at 500 mA over the full temperature range.
- Snooze mode with a quiescent current of 2 μA.
- Designed to charge large capacitor values in the Farad range.
- Up to 92% efficiency.
- Power good output indicates appropriate output voltage level even in shutdown.
- Load disconnect and reverse current protection.
- Short-circuit protection.
- 100% Duty-cycle mode when VIN > VOUT.
- Internal softstart and loop compensation to simplify the design process.
- Available in a 2 × 2-mm WSON-8 package.
Applications
- Current limited applications with high peak power loads (e.g., SSD, PCMCIA Tx bursts, memory, GPRS/GSM Tx).
- Li-Ion battery applications.
- Battery backup applications.
- Audio applications.
- RF power amplifier (RF-PA) buffer applications.
Q & A
- What is the input voltage range of the TPS61251?
The input voltage range is from 2.3 V to 6 V.
- What is the maximum output voltage of the TPS61251?
The maximum output voltage can be programmed up to 6.5 V.
- How accurate is the input current limit of the TPS61251?
The input current limit has an accuracy of ±10% at 500 mA.
- What is the quiescent current in snooze mode?
The quiescent current in snooze mode is 2 μA.
- What is the typical operating frequency of the TPS61251?
The typical operating frequency is 3.5 MHz.
- Does the TPS61251 have built-in protection features?
Yes, it includes load disconnect, reverse current protection, and short-circuit protection.
- What package type is the TPS61251 available in?
The TPS61251 is available in a 2 × 2-mm WSON-8 package.
- What are some typical applications of the TPS61251?
Typical applications include current limited applications, Li-Ion battery applications, battery backup applications, audio applications, and RF-PA buffer applications.
- How does the TPS61251 handle high current pulses?
The device can provide high current pulses by using a reservoir capacitor, ensuring the input source is not overloaded.
- Does the TPS61251 have an internal softstart feature?
Yes, it has an internal softstart feature to prevent inrush current and simplify the design process.
