|
|
PDF LTC3550-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC3550-1 | |
| Descripción | Dual Input USB/AC Adapter Li-Ion Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC3550-1 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
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
1 page  
www.DataSheet4U.com
LTC3550-1
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Regulated Charger Output (Float)
Voltage vs Charge Current
4.26
VDCIN = VUSBIN = 5V
4.24
4.22
4.20
4.18
4.16 RIDC = RIUSB = 2k RIDC = 1.25k
4.14
4.12
4.10
0
100 200 300 400 500 600 700 800
CHARGE CURRENT (mA)
3550-1 G01
IUSB Pin Voltage vs Temperature
(Constant-Current Mode)
1.008
1.006
1.004
1.002
1.000
0.998
VUSBIN = 8V
VUSBIN = 4.3V
0.996
0.994
0.992
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
3550-1 G04
Regulated Charger Output (Float)
Voltage vs Temperature
4.220
4.215
VDCIN = VUSBIN = 5V
4.210
4.205
4.200
4.195
4.190
4.185
4.180
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
3550-1 G02
Charge Current vs IDC Pin Voltage
900
VDCIN = 5V
800
700
RIDC = 1.25k
600
RIDC = 2k
500
400
300
200
RIDC = 10k
100
0
0 0.2 0.4 0.6 0.8 1.0 1.2
VIDC (V)
3550-1 G05
IDC Pin Voltage vs Temperature
(Constant-Current Mode)
1.008
1.006
1.004
1.002
1.000
0.998
VDCIN = 8V
VDCIN = 4.3V
0.996
0.994
0.992
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
3550-1 G03
Charge Current
vs IUSB Pin Voltage
900
VUSBIN = 5V
800
700
RIUSB = 1.25k
600
RIUSB = 2k
500
400
300
200
RIUSB = 10k
100
0
0 0.2 0.4 0.6 0.8 1.0 1.2
VIUSB (V)
3550-1 G06
⎯P⎯W⎯R Pin I-V Curve
35
VDCIN = VUSBIN = 5V
30
25
20
TA = – 40°C
TA = 25°C
TA = 90°C
15
10
5
0
01
2 34 5
VPWR (V)
67
3550-1 G07
⎯C⎯H⎯R⎯G Pin I-V Curve
35
VDCIN = VUSBIN = 5V
30
25
20
TA = – 40°C
TA = 25°C
TA = 90°C
15
10
5
0
01
2 34 5
VCHRG (V)
67
3550-1 G08
USBPWR Pin I-V Curve
6
VDCIN = 5V
VUSBIN = 0V
5
4
TA = – 40°C
TA = 25°C
TA = 90°C
3
2
1
0
01
2 34 5
VUSBPWR (V)
67
3550-1 G09
35501f
5
5 Page 
www.DataSheet4U.com
LTC3550-1
PI FU CTIO S
DCIN (Pin 16): Wall Adapter Input Supply Pin. Provides
power to the battery charger. The maximum supply
current is 950mA. This should be bypassed with a 1µF
capacitor.
Exposed Pad (Pin 17): GND. The exposed backside of the
package is ground and must be soldered to the PCB ground
for electrical connection and maximum heat transfer.
BLOCK DIAGRA
DCIN
16
BAT USBIN
15 1
CC/CV
REGULATOR
CC/CV
REGULATOR
1mA MAX
USBPWR 13
10mA MAX
PWR 4
+
4.15V
–
DCIN UVLO
+
DC
SOFT-
START
USB
SOFT-
START
+
–
USBIN UVLO
+
3.95V
SLOPE
COMP
OSC
ITH
BURST
CLAMP
EA
10mA MAX
CHRG 5
BAT –
ENABLE 12
RECHRG
LOGIC
TERM
RENABLE
+
RECHARGE
–
4.1V
BAT
DC_ENABLE USB_ENABLE
CHARGER CONTROL
+
TERMINATION
–
100mV
IBAT
/1000
IBAT
/1000
IBAT
/1000
– BAT
–+
ICOMP
SQ
RQ
RS LATCH
+
THERMAL
REGULATION
–
TDIE
105°C
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
IRCMP
FREQ
SHIFT
6 VOUT
R1
0.6V
R2
7 VCC
5Ω
10 SW
3
ITERM
RITERM
14
IDC
RIDC
2
IUSB
RIUSB
11
RUN
8, 9, 17
GND
35501f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC3550-1.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC3550-1 | Dual Input USB/AC Adapter Li-Ion Battery Charger | Linear Technology |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |