LTC3559EUD#PBF

LTC3559 is a USB battery charger with dual high efficiency buck regulator. The parts are 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 at the BAT pin. The battery charger has an NTC input for temperature qualified charging. The CHRG pin allows battery status to be monitored continuously during the charging process. An internal timer controls charger termination. Each monolithic synchronous buck regulator provides upto 400mA of output current while operating at efficiencies greater than 90% over the entire Li-Ion/Polymer range. A MODE pin provides the flexibility to place both buck regulators in a power saving Burst Mode® operation or a low noise pulse skip mode. It is used in application such as SD/flash-based MP3 players, low power handheld applications etc.

• Standalone USB charger, internal timer termination
• HPWR input selects 20% or 100% of programmed charge current
• Bad battery detection, CHRG indicates C/10 or timeout
• Zero current in shutdown
• Low noise pulse skip operation or power saving burst mode operation
• Switching frequency is 2.25MHz typical at (MODE = 0V, t TA = 25°C)
• Burst mode supply current is 35μA typ at (MODE = 1, one buck enabled, TA = 25°C)
• Operating temperature is -40°C to 85°C
• Package style is 16-lead plastic QFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party