LTC3555_LTC3555-X| Datasheet

Datasheet preview, take a look at Datasheets before downloading (Data Sheet is available on manufacturer site)

FEATURES
Power Manager n High Efficiency Switching PowerPathTM Controller with Bat-TrackTM Adaptive Output Control n Programmable USB or Wall Current Limit (100mA/500mA/1A) n Full Featured Li-Ion/Polymer Battery Charger n 1.5A Maximum Charge Current n Internal 180m Ideal Diode + External Ideal Diode Controller Powers Load in Battery Mode n Low No-Load Quiescent Current when Powered from BAT (<32A) DC/DCs n Triple High Efficiency Step-Down DC/DCs (1A/400mA/400mA IOUT) n All Regulators Operate at 2.25MHz n Dynamic Voltage Scaling on Two Outputs n I2C or Independent Enable, V OUT Controls n Low No-Load Quiescent Current: 20A n 28-Pin (4mm 5mm 0.75mm) QFN Package

LTC3555/LTC3555-X High Efficiency USB Power Manager + Triple Step-Down DC/DC DESCRIPTION
The LTC 3555 family are highly integrated USB compatible power management and battery charger ICs for Li-Ion/Polymer battery applications. They include a high efficiency current limited switching PowerPath manager with automatic load prioritization, a battery charger, an ideal diode and three general purpose synchronous step-down switching regulators. The LTC3555 family limits input current to either 100mA or 500mA for USB applications or 1A for adapter-powered applications. Unlike linear chargers, the LTC3555 family's switching architecture transmits nearly all of the power available from the USB port to the load with minimal loss and heat which eases thermal constraints in small spaces. Two of the three general purpose switching regulators can provide up to 400mA and the third can deliver 1A. The entire product can be controlled via I2C or simple I/O. The LTC3555-1/LTC3555-3 versions offer "instant-on" power delivery to the portable product even with a very low battery voltage. The LTC3555-3 version also h
as a reduced charger float voltage of 4.100V for battery safety and longevity. The LTC3555 family is available in the low profile 28-pin (4mm 5mm 0.75mm) QFN surface mount package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118 and 6404251.

APPLICATIONS
n n n n

HDD-Based MP3 Players, PDAs, GPS, PMPs Portable Medical Products Handheld Instrumentation Other USB-Based Handheld Products

TYPICAL APPLICATION
High Efficiency PowerPath Manager and Triple Step-Down Regulator
USB/WALL 4.35V TO 5.5V USB COMPLIANT STEP-DOWN REGULATOR CURRENT CONTROL CHARGE LTC3555/LTC3555-X ALWAYS ON LDO TRIPLE HIGH EFFICIENCY STEP-DOWN SWITCHING REGULATORS I
2C PORT

TO OTHER LOADS CC/CV BATTERY CHARGER

Switching Regulator Efficiency to System Load (POUT/PBUS)
100 90 80

0V

OPTIONAL

+
T

EFFICIENCY (%)

70 60 50 40 30 20 10

BAT = 4.2V BAT = 3.3V

Li-Ion 3.3V/25mA 0.8V TO 3.6V/400mA 0.8V TO 3.6V/400mA 0.8V TO 3.6V/1A RST 2 RTC/LOW POWER LOGIC MEMORY I/O CORE PROCESSOR I C
3555 TA01

1 2 3

ENABLE CONTROLS

5

0 0.01

VBUS = 5V IBAT = 0mA 10x MODE 0.1 IOUT (A) 1
3555 TA01b

2

3555fd

1

LTC3555_LTC3555-X Datasheet linear Download PDF

Add this permalink to your bookmarks for future download of LTC3555_LTC3555-X datasheet

Permalink: http://datasheet.emcelettronica.com/linear/LTC3555_LTC3555-X

LTC3555_LTC3555-.. DATASHEET