LINEAR TECHNOLOGY - LTC3559 Data Sheet User Guide Manual
Summary
The LTC3559 is a high-performance USB battery charger featuring dual, highly efficient synchronous buck regulators and sophisticated charge management for single-cell Li-Ion/Polymer batteries. This technical manual provides comprehensive details on its operation, including programmable charging up to 950mA, NTC temperature monitoring, and power-saving modes. It is the ideal solution for embedded systems developers designing low-power handheld electronics and portable devices requiring precise management of multiple regulated supply rails.
Page 1 Text Content
LTC3559/LTC3559-1
Linear USB Battery Charger with Dual Buck Regulators
FEATURES DESCRIPTION Battery Charger
The LTC®3559/LTC3559-1 are USB battery chargers with
n Standalone USB Charger
dual high effi ciency buck regulators. The parts are ideally
n Up to 950m A Charge Current Programmable via
suited to power single-cell Li-Ion/Polymer based handheld
Single Resistor applications needing multiple supply rails. n HPWR Input Selects 20% or 100% of Programmed
Battery charge current is programmed via the PROG pin
Charge Current
and the HPWR pin, with capability up to 950m A at the BAT
n NTC Input for Temperature Qualifi ed Charging
pin. The battery charger has an NTC input for temperature
n Internal Timer Termination
qualifi ed charging. The CHRG pin allows battery status to
n Bad Battery Detection
be monitored continuously during the charging process.
n CHRG Indicates C/10 or Timeout
An internal timer controls charger termination.
Buck Regulators
Each monolithic synchronous buck regulator provides up
n 400m A Output Current
to 400m A of output current while operating at effi ciencies
n 2.25MHz Constant Frequency Operation
greater than 90% over the entire Li-Ion/Polymer range.
n Zero Current in Shutdown
A MODE pin provides the fl exibility to place both buck
n Low Noise Pulse Skip Operation or Power Saving
regulators in a power saving Burst Mode® operation or a
Burst Mode Operation
low noise pulse skip mode.
n Low No-Load Quiescent Current: 35μA
n Available in a Low Profi le Thermally Enhanced The LTC3559/LTC3559-1 are offered in a low profi le ther-
16-Lead 3mm × 3mm QFN Package mally enhanced 16-lead (3mm × 3mm) QFN package. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. APPLICATIONS All other trademarks are the property of their respective owners.
n SD/Flash-Based MP3 Players
n Low Power Handheld Applications
TYPICAL APPLICATION USB Charger Plus Dual Buck Regulators
UP TO 500m A
VCC BATUSB (4.3V TO 5.5V) SINGLE
OR AC ADAPTOR
1μF Li-lon CELL
(2.7V TO 4.2V)
NTC 2.2μF
LTC3559
PROG SW1
CHRG FB1
DIGITAL
HPWR 4.7μH
CONTROL 1.2V
EN2 FB2
MODE 649k
EXPOSED
GND PAD
3559 TA01
3559fb
Page Summary Contents For LINEAR TECHNOLOGY - LTC3559 Data Sheet User Guide Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 315.58 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What is the programmable charge current for the battery charger?
The battery charge current is programmable via the PROG pin and the HPWR pin, with a capability up to 950mA at the BAT pin.
Does the device offer temperature-qualified charging?
Yes, it has an NTC input for temperature qualified charging through the CHRG pin.
How do I manage power consumption or reduce noise in operation?
Use the MODE pin to place both buck regulators into a low noise pulse skip mode (Burst Mode Operation) or Power Saving Burst Mode operation.
What are the operating temperature ranges for this component?
The product has an Operating Temperature Range of –40°C to 85°C, and a Storage Temperature range of –65°C to 125°C.