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LTC3550EDHC#TR

Description
Battery Management LTC3550 - Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter
CategoryPower/power management    The power supply circuit   
File Size300KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC3550EDHC#TR Overview

Battery Management LTC3550 - Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter

LTC3550EDHC#TR Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instructionHVSON,
Reach Compliance Codenot_compliant
ECCN codeEAR99
Adjustable thresholdYES
Analog Integrated Circuits - Other TypesPOWER SUPPLY SUPPORT CIRCUIT
JESD-30 codeR-PDSO-N16
JESD-609 codee0
length5 mm
Humidity sensitivity level1
Number of channels2
Number of functions1
Number of terminals16
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeHVSON
Package shapeRECTANGULAR
Package formSMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height0.8 mm
Maximum supply voltage (Vsup)8 V
Minimum supply voltage (Vsup)4.3 V
Nominal supply voltage (Vsup)5 V
surface mountYES
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3 mm
LTC3550
Dual Input USB/AC Adapter
Li-Ion Battery Charger with
600mA Buck Converter
FEATURES
DESCRIPTIO
Charges Single-Cell Li-Ion Battery from Wall
Adapter and USB Inputs
Automatic Input Power Detection and Selection
Charge Current Programmable Up to 950mA from
Wall Adapter Input
Adjustable Output, High Efficiency 600mA
Synchronous DC/DC Converter
No External MOSFET, Sense Resistor or Blocking
Diode Needed
Thermal Regulation Maximizes Charge Rate Without
Risk of Overheating*
Preset Charge Voltage with ±0.6% Accuracy
Programmable Charge Current Termination
1.5MHz Constant Frequency Operation (Step-Down
Converter)
18μA USB Suspend Current in Shutdown
“Power Present” Status Output
Charge Status Output
Automatic Recharge
Available in a Thermally Enhanced, Low Profile
(0.75mm) 16-Lead (5mm
×
3mm) DFN Package
The LTC
®
3550 is a standalone linear charger with a 600mA
monolithic synchronous buck converter. It is capable of
charging a single-cell Li-Ion battery from both wall adapter
and USB inputs. The charger automatically selects the
appropriate power source for charging.
Internal thermal feedback regulates the battery charge
current to maintain a constant die temperature during high
power operation or high ambient temperature conditions.
The float voltage is fixed at 4.2V and the charge currents
are programmed with external resistors. The LTC3550
terminates the charge cycle when the charge current
drops below the programmed termination threshold after
the final float voltage is reached. With power applied to
both inputs, the LTC3550 can be put into shutdown mode
reducing the DCIN supply current to 20μA, the USBIN
supply current to 10μA, and the battery drain current to
less than 2μA.
The DC/DC converter switching frequency is internally
set at 1.5MHz, allowing the use of small surface mount
inductors and capacitors.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. patents, includng 6522118, 6700364, 6580258, 5481178, 6304066,
6127815, 6498466, 6611131
APPLICATIO S
Cellular Telephones
TYPICAL APPLICATIO
2.2µH
SW
LTC3550
WALL
ADAPTER
USB
PORT
DCIN
USBIN
1µF
2k
1%
1µF
1.24k
1%
IUSB
IDC
V
FB
RUN
V
CC
BAT
ITERM
GND
800mA (WALL)
500mA (USB)
4.7µF
2k
1%
301k
22pF
301k
C
OUT
10µF
CER
V
OUT
1.2V
600mA
BATTERY
CHARGE
VOLTAGE (V) CURRENT (mA)
Dual Input Battery Charger and DC/DC Converter
DCIN
VOLTAGE (V)
+
4.2V
SINGLE-CELL
Li-Ion BATTERY
3550 TA01
U
Complete Charge Cycle
(1100mA Battery)
1000
800
600
400
200
0
4.2
4.0
3.8
3.6
3.4
5.0
2.5
0
0
0.5
1.0
2.0
1.5
TIME (HR)
2.5
3.0
3550fa
U
U
CONSTANT VOLTAGE
USBIN = 5V
T
A
= 25°C
R
IDC
= 1.24k
R
IUSB
= 2k
3550 TA02
1
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