Battery Charger. LTC3550-1 Datasheet

LTC3550-1 Charger. Datasheet pdf. Equivalent

Part LTC3550-1
Description Dual Input USB/AC Adapter Li-Ion Battery Charger
Feature www.DataSheet4U.com FEATURES ■ ■ ■ LTC3550-1 Dual Input USB/AC Adapter Li-Ion Battery Charger with.
Manufacture Linear Technology
Datasheet
Download LTC3550-1 Datasheet




LTC3550-1
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LTC3550-1
FEATURES
Dual Input USB/AC Adapter
Li-Ion Battery Charger with
600mA Buck Converter
DESCRIPTIO
Charges Single-Cell Li-Ion Batteries from Wall
Adapter and USB Inputs
Automatic Input Power Detection and Selection
Charge Current Programmable Up to 950mA from
Wall Adapter Input
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
Independent “Power Present” Status Outputs
Charge Status Output
Automatic Recharge
Available in a Thermally Enhanced, Low Profile
(0.75mm) 16-Lead (5mm x 3mm) DFN Package
U
APPLICATIO S
Cellular Telephones
The LTC®3550-1 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 LTC3550-1
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 LTC3550-1 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 synchronous buck converter generates a fixed output
voltage of 1.875V. The switching frequency is internally
set at 1.5MHz, allowing the use of small surface mount
inductors and capacitors.
, LTC and LT 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
TYPICAL APPLICATIO
Dual Input Battery Charger and DC/DC Converter
WALL
ADAPTER
USB
PORT
1µF
2k
1%
1µF
LTC3550-1
RUN SW
DCIN
USBIN
IUSB
VOUT
VCC
BAT
IDC ITERM
1.24k
GND
1%
2.2µH
800mA (WALL)
500mA (USB)
VOUT
1.875V
COUT 600mA
10µF
CER
4.7µF
2k
1%
+ 4.2V
SINGLE-CELL
Li-Ion BATTERY
3550-1 TA01
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
–2.5
0
CONSTANT VOLTAGE
USBIN = 5V
TA = 25°C
RIDC = 1.25k
RIUSB = 2k
0.5 1.0 1.5 2.0 2.5 3.0
TIME (HR)
3550-1 TA02
35501f
1



LTC3550-1
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LTC3550-1
ABSOLUTE AXI U RATI GS
(Note 1)
DCIN, USBIN.............................................. –0.3V to 10V
ENABLE, CHRG, PWR, USBPWR ............... –0.3V to 10V
BAT, IDC, IUSB, ITERM ................................ –0.3V to 7V
VCC............................................................... –0.3V to 6V
RUN, VOUT ..................................................–0.3V to VCC
SW (DC)........................................–0.3V to (VCC + 0.3V)
DCIN Pin Current (Note 2) ..........................................1A
USBIN Pin Current (Note 2) .................................700mA
BAT Pin Current (Note 2) ............................................1A
P-Channel SW Source Current (DC).....................800mA
N-Channel SW Source Current (DC) ....................800mA
Peak SW Sink and Source Current ...........................1.3A
Operating Temperature Range (Note 3) ... –40°C to 85°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range................... –65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
USBIN 1
IUSB 2
ITERM 3
PWR 4
CHRG 5
VOUT
VCC
GND
6
7
8
16 DCIN
15 BAT
14 IDC
13 USBPWR
17
12 ENABLE
11 RUN
10 SW
9 GND
DHC PACKAGE
16-LEAD (5mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 40°C (Note 4)
EXPOSED PAD IS GROUND (PIN 17)
MUST BE SOLDERED TO PCB
ORDER PART NUMBER
PART MARKING
LTC3550EDHC-1
35501
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VDCIN = 5V, VUSBIN = 5V, VCC = 3.6V unless otherwise noted.
SYMBOL
VDCIN
VUSBIN
VCC
VENABLE
RENABLE
VRUN
IRUN
VCHRG
VPWR
VUSBPWR
VUVDC
VUVUSB
PARAMETER
Wall Adapter Input Supply Voltage
USB Port Input Supply Voltage
Buck Regulator Input Supply Voltage
ENABLE Input Threshold Voltage
ENABLE Pulldown Resistance
RUN Threshold Voltage
RUN Leakage Current
CHRG Output Low Voltage
PWR Output Low Voltage
USBPWR Output Low Voltage
DCIN Undervoltage Lockout Voltage
USBIN Undervoltage Lockout Voltage
CONDITIONS
ICHRG = 5mA
IPWR = 5mA
IUSBPWR = 200µA
From Low to High
Hysteresis
From Low to High
Hysteresis
MIN TYP MAX UNITS
4.3
8V
4.3
8V
2.5
5.5 V
0.4 0.7 1.0
V
1.2 2
5
MΩ
0.3 1 1.5
V
±0.01 ±1
µA
0.35 0.6
V
0.35 0.6
V
0.35 0.6
V
4.0 4.15 4.3
200
V
mV
3.8 3.95 4.1
200
V
mV
35501f
2







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