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Linear Technology Electronic Components Datasheet

LTC3550EDHC Datasheet

Dual Input USB/AC Adapter Li-Ion Battery Charger

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LTC3550
Dual Input USB/AC Adapter
Li-Ion Battery Charger with
600mA Buck Converter
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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
U
APPLICATIO S
Cellular Telephones
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
TYPICAL APPLICATIO
Dual Input Battery Charger and DC/DC Converter
WALL
ADAPTER
USB
PORT
1µF
1µF
SW
LTC3550
DCIN
VFB
RUN
USBIN VCC
IUSB BAT
2k
1%
IDC ITERM
1.24k
GND
1%
2.2µH
22pF 301k
VOUT
1.2V
COUT 600mA
10µF
CER
301k
800mA (WALL)
500mA (USB)
4.7µF
2k
1%
+ 4.2V
SINGLE-CELL
Li-Ion BATTERY
3550 TA01
1000
800
600
400
200
0
4.2
4.0
3.8
3.6
3.4
5.0
2.5
0
0
Complete Charge Cycle
(1100mA Battery)
CONSTANT VOLTAGE
USBIN = 5V
TA = 25°C
RIDC = 1.24k
RIUSB = 2k
0.5 1.0 1.5 2.0 2.5 3.0
TIME (HR)
3550 TA02
3550fa
1


Linear Technology Electronic Components Datasheet

LTC3550EDHC Datasheet

Dual Input USB/AC Adapter Li-Ion Battery Charger

No Preview Available !

LTC3550
ABSOLUTE AXI U RATI GS
(Note 1)
DCIN, USBIN.............................................. –0.3V to 10V
wwwE.dNat,aCshHeeRt4Gu,.cPoWm R, HPWR ............................ –0.3V to 10V
BAT, IDC, IUSB, ITERM ................................ –0.3V to 7V
VCC............................................................... –0.3V to 6V
RUN, VFB.....................................................–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
VFB 6
VCC 7
GND 8
16 DCIN
15 BAT
14 IDC
13 HPWR
17
12 EN
11 RUN
10 SW
9 GND
DHC PACKAGE
16-LEAD (5mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 40°C (NOTE 4)
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER DHC PART MARKING
LTC3550EDHC
3550
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
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VDCIN
VUSBIN
VCC
VEN
REN
VRUN
IRUN
VCHRG
VPWR
VHPWR
RHPWR
VUVDC
Wall Adapter Input Supply Voltage
USB Port Input Supply Voltage
Buck Regulator Input Supply Voltage
EN Input Threshold Voltage
EN Pull-Down Resistance
RUN Threshold Voltage
RUN Leakage Current
CHRG Output Low Voltage
PWR Output Low Voltage
HPWR Input Threshold Voltage
HPWR Pull-Down Resistance
DCIN Undervoltage Lockout Voltage
ICHRG = 5mA
IPWR = 5mA
From Low to High
Hysteresis
4.3
8
V
4.3
8
V
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
0.4
0.7
1
V
1
2
5
MΩ
4.0
4.15
4.3
V
200
mV
VUVUSB
USBIN Undervoltage Lockout Voltage From Low to High
Hysteresis
3.8
3.95
4.1
V
200
mV
VASD-DC
VASD-USB
VDCIN – VBAT Lockout Threshold Voltage
VUSBIN – VBAT Lockout Threshold
Voltage
VDCIN from Low to High, VBAT = 4.2V
VDCIN from High to Low, VBAT = 4.2V
VUSBIN from Low to High, VBAT = 4.2V
VUSBIN from High to Low, VBAT = 4.2V
140
180
220
mV
20
50
80
mV
140
180
220
mV
20
50
80
mV
3550fa
2


Part Number LTC3550EDHC
Description Dual Input USB/AC Adapter Li-Ion Battery Charger
Maker Linear
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LTC3550EDHC Datasheet PDF






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