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Linear Technology Electronic Components Datasheet

LTC4077EDD Datasheet

Dual Input Standalone Li-Ion Battery Charger

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FEATURES
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
C/10 Charge Current Termination
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
Preset Charge Voltage with ±0.6% Accuracy
18µA USB Suspend Current in Shutdown
Power Present Status Output
Charge Status Output
Automatic Recharge
Available in a Thermally Enhanced, Low Profile
(0.75mm) 10-Lead (3mm × 3mm) DFN Package
U
APPLICATIO S
Cellular Telephones
Handheld Computers
Portable MP3 Players
Digital Cameras
LTC4077
Dual Input Standalone
Li-Ion Battery Charger
DESCRIPTIO
The LTC®4077 is a standalone linear charger that is capable
of charging a single-cell Li-Ion battery from both wall
adapter and USB inputs. The charger can detect power at
the inputs and automatically select the appropriate power
source for charging.
No external sense resistor or blocking diode is required
for charging due to the internal MOSFET architecture.
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 current
is programmed with an external resistor. The LTC4077
terminates the charge cycle when the charge current drops
below the termination threshold after the final float voltage
is reached. The LTC4077 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 even with power applied to both inputs.
Other features include automatic recharge, undervoltage
lockout, charge status output, power present status output
to indicate the presence of wall adapter or USB power and
high power/low power adjustable mode for USB compat-
ible applications.
, 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, including 6522118
TYPICAL APPLICATIO
Dual Input Battery Charger for Single-Cell Li-Ion
WALL
ADAPTER
USB
PORT
1F
LTC4077
DCIN
BAT
USBIN HPWR
1F
IUSB
2k
IDC
IUSBL
1% 1.24k
GND
1%
800mA (WALL)
500mA (USB)
+ 4.2V
SINGLE CELL
Li-Ion BATTERY
2k
1%
4077 TA01
Complete Charge Cycle (1100mAh Battery)
1000
800
600
400
200
0
4.2
4.0
3.8
3.6
3.4
5.0
2.5
0
CONSTANT VOLTAGE
USBIN = 5V
TA = 25°C
RIDC = 1.24k
RIUSB = 2k
HPWR = 5V
0 0.5 1.0 1.5 2.0 2.5 3.0
TIME (HR)
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Linear Technology Electronic Components Datasheet

LTC4077EDD Datasheet

Dual Input Standalone Li-Ion Battery Charger

No Preview Available !

LTC4077
ABSOLUTE AXI U RATI GS
(Notes 1, 9)
Input Supply Voltage (DCIN, USBIN) ......... –0.3V to 10V
EN, CHRG, PWR, HPWR ............................ –0.3V to 10V
BAT, IDC, IUSB, IUSBL................................. –0.3V to 7V
DCIN Pin Current (Note 6) ..........................................1A
USBIN Pin Current (Note 6) .................................700mA
BAT Pin Current (Note 6) ............................................1A
BAT Short-Circuit Duration............................ Continuous
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2) .. –40°C to 85°C
Storage Temperature Range.................. –65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
USBIN 1
IUSB 2
IUSBL 3
PWR 4
CHRG 5
10 DCIN
9 BAT
11
8 IDC
7 HPWR
6 EN
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 40°C/W (NOTE 3)
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER DD PART MARKING
LTC4077EDD
LBWD
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, HPWR = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VDCIN
VUSBIN
IDCIN
IUSBIN
VFLOAT
IBAT
VIDC
VIUSB
VIUSBL
IC/IO
Supply Voltage
4.3
8
V
Supply Voltage
4.3
8
V
DCIN Supply Current
Charge Mode (Note 4), RIDC = 10k
Standby Mode; Charge Terminated
Shutdown Mode (EN = 5V)
150
700
µA
50
100
µA
20
40
µA
USBIN Supply Current
Regulated Output (Float) Voltage
BAT Pin Current
IDC Pin Regulated Voltage
Charge Mode (Note 5), RIUSB = RIUSBL = 10k,
VDCIN = 0V
Standby Mode; Charge Terminated, VDCIN = 0V
Shutdown (VDCIN = 0V, EN = 5V)
VDCIN > VUSBIN
150
700
µA
50
100
µA
18
36
µA
10
20
µA
IBAT = 1mA (Note 9)
4.175 4.2 4.225
V
IBAT = 1mA, 0°C < TA < 85°C, 4.3V < VCC < 8V
4.158 4.2 4.242
V
RIDC = 1.25k, Constant-Current Mode
RIUSB = 2.1k, Constant-Current Mode
RIDC = 10k or RIUSB = 10k
RIUSBL = 4k, HPWR = 0
Standby Mode, Charge Terminated
760
800
840
mA
450
476
500
mA
92
100
108
mA
44
50
56
mA
–3
–6
µA
Shutdown Mode (Charger Disabled)
–1
–2
µA
Sleep Mode (VDCIN = 0V, VUSBIN = 0V)
±1
±2
µA
Constant-Current Mode
0.95
1
1.05
V
IUSB Pin Regulated Voltage
Constant-Current Mode
0.95
1
1.05
V
IUSBL Pin Regulated Voltage
Constant-Current Mode
0.18
0.2
0.22
V
Charge Current Termination Threshold VDCIN = 5V, RIDC = 1.25k (Note 7)
VUSBIN = 5V, VDCIN = 0V
0.09
0.1
0.11 mA/mA
0.09
0.1
0.11 mA/mA
4077fa
2


Part Number LTC4077EDD
Description Dual Input Standalone Li-Ion Battery Charger
Maker Linear
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LTC4077EDD Datasheet PDF






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