LTC3558EUD#PBF

LTC3558 is a USB battery charger with dual high efficiency switching regulator. This device is ideally suited to power single-cell Li-Ion/Polymer based handheld applications needing multiple supply rails. Battery charge current is programmed via the PROG pin and the HPWR pin with capability upto 950mA of current at the BAT pin. The CHRG pin allows battery status to be monitored continuously during the charging process. An internal timer controls charger termination. The part includes monolithic synchronous buck and buck boost regulators that can provide upto 400mA of output current each and operate at efficiencies greater than 90% over the entire Li-Ion/Polymer battery range. The buck boost regulator can regulate its programmed output voltage at its rated deliverable current over the entire Li-Ion range without drop out, increasing battery runtime. It is used in application such as SD/flash-based MP3 players, low power handheld applications etc.

• Input supply voltage range is 4.3V to 5.5V
• Standalone USB charger
• HPWR input selects 20% or 100% of programmed charge current
• NTC input for temperature qualified charging
• Internal timer termination, bad battery detection
• Power saving Burst Mode® operation
• Switching frequency is 2.25MHz typical at (TA = 25°C, VCC = 5V, BAT = PVIN1 = PVIN2 = 3.6V)
• Operating temperature is -40°C to 85°C
• Package style is 20-lead plastic QFN

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