Datasheet Linear Technology LTC3558 — Datenblatt

LTC3558
Linear USB Battery Charger
with Buck and
Buck-Boost Regulators
FEATURES DESCRIPTION Battery Charger
n Standalone USB Charger
n Up to 950mA Charge Current Programmable via
Single Resistor
n HPWR Input Selects 20% or 100% of Programmed
Charge Current
n NTC Input for Temperature Qualified Charging
n Internal Timer Terminatio Bad Battery Detection
Switching Regulators (Buck and Buck-Boost)
n Up to 400mA Output Current per Regulator
n 2.25MHz Constant-Frequency Operatio Power Saving Burst Mode® Operatio Low Profile, 20-Lead, 3mm × 3mm QFN Package The LTC®3558 is a USB battery charger with dual high efficiency switching regulators. The 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 up to 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 buckboost regulators that can provide up to 400mA of output
current each and operate at efп¬Ѓciencies greater than 90% …