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LTC3550EDHC#PBF

Description
IC CHARGER BATT DUAL 16-DFN
Categorysemiconductor    Power management   
File Size307KB,6 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric Compare View All

LTC3550EDHC#PBF Overview

IC CHARGER BATT DUAL 16-DFN

LTC3550EDHC#PBF Parametric

Parameter NameAttribute value
battery chemistrylithium ion
Number of batteries1
Current - chargingConstant current - programmable
Programmable featurescurrent
failsafeovervoltage
Charging current - maximum950mA
Battery pack voltage4.2V
Voltage - Power Supply (Highest)8V
interfaceUSB
Operating temperature-40°C ~ 85°C(TA)
Package/casing16-WFDFN Exposed Pad
Supplier device packaging16-DFN(5x3)
DUAL INPUT LI-ION BATTERY CHARGER WITH SYNCHRONOUS BUCK REGULATOR
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1068A
LTC3550
Demonstration circuit 1068A is a complete sin-
gle cell Lithium-Ion battery charger and a syn-
chronous buck voltage regulator with adjustable
output voltage. Operating at a frequency of
1.5MHz, the regulator can be powered from ei-
ther the Li-Ion battery or from the AC adapter
(selected by a jumper). The battery charger
automatically selects input power from the AC
adapter or USB port, which ever is appropriate.
This demonstration circuit allows the user to
quickly evaluate the LTC3550 performance. In-
dividual jumpers are provided for shutting down
the charger from either input power source,
shutting down the regulator and for selecting
several regulated output voltages.
LEDs indicate charger information (input power
and charge status) and terminals on the board
allow easy hookup to input supplies and battery
or battery simulator. Provisions are provided for
programming and monitoring charge current
Table 1. Typical Specifications (25°
C)
from each input power source individually, pro-
gramming the minimum charge current termina-
tion level and two charge current levels when
charging from USB power.
The high switching frequency of the DC/DC
converter allow tiny LC components to be used
and the 16-Pin 5mm x 3mm DFN thermally en-
hanced package with the metal backside allow
the linear charger to provide up to 950mA of
charge current in addition to the regulators out-
put current. The charge current on this board is
set for either 100mA or 500mA when powered
from USB power and 800mA when used with an
AC adapter.
Design files for this circuit board are available.
Call the LTC factory.
LTC and Burst Mode are trademarks of Linear
Technology Corporation
Adapter and USB Input Voltage Range (
Buck regulator powered from Battery
)
Adapter Input Voltage Range (
Buck regulator powered from Adapter Input
)
Charger Output Float Voltage, VBAT (
constant voltage mode
)
Charge Current, IBAT from Adapter Input (
constant current mode
)
Charge Current, IBAT from USB Input (
constant current mode
) HPWR terminal High/Low
Trickle Charge Current, IBAT from Adapter Input (
Battery Voltage <2.9V)
Adapter and USB Current Monitor Output
Charge Termination Threshold Current
C/x Output Indication Level LED (CHRG)
VOUT Regulator Output Voltage — 1.2V, 1.8V, 2.5V (
100mA Load
)
VOUT Ripple Voltage — (
400mA Load
)
VOUT Ripple Voltage — Burst mode (
Light Load
)
Regulator Maximum Output Current
4.25V to 8V
4.25V to 5.5V
4.2V ±0.5%
800mA ± 6%
500mA/100mA ± 6%
80mA ± 6%
1V ±2.5% @ Full Current
50mA ±10%
50mA ±10%
± 2.5%
18mV p-p
80mV p-p
600mA
1

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