TPS61251

illustrate

The TPS61251 device provides a power solution for products powered by a three-cell, nickel-cadmium or nickel-metal hydride battery or a single-cell lithium-ion or lithium-polymer battery. The wide input voltage range is ideal for portable applications such as mobile phones, solid-state drives (SSDs) and wireless modem power supplies. The converter is designed to be responsible for Farad large capacitance and supports battery backup applications. The TPS61251 operating in the capacitor charging source is as a constant current up to V_outputReach its programmed value. The charging current can be passed through an external resistor R_ILIM，It also provides an average input current ± 10% current limit accuracy.

In combination with reservoir capacitors TPS61251 converters can provide high current pules that will exceed the capabilities of suppling circuits (PC slots, USB) and keep the slots within their ability to be power safe.

characteristic

• Resistor programmable input current limit
  • 10% current accuracy ± over temperature over 500mA
  • Programmable from 100mA to 1,500 mA
• Snooze mode draws only 2μA (typical) of quiescent current
• As charged in Farad with a large capacitance value range
• Up to 92% efficiency
• Power Good indicates an appropriate output voltage level, even at shutdown
• V IN_targetThe range is from 2.3V to 6.0V
• The output voltage is adjustable to 6.5V
• 100% duty cycle mode as V_{The output is > in Vin}
• Load disconnect and reverse current protection
• Short-circuit protection
• The typical operating frequency is 3.5 MHz
• Available in 2 × 2mm QFN-8 packages
• apply
  • Applications with limited high peak power load currents
    (SSD, PCMCIA Launch Burst, Memory Function, GPRS/GSM Texas)
  • Lithium-ion battery applications
  • Application of battery backup
  • Audio apps
  • RF power amplifier buffer