|
|
PDF LTC3550 Data sheet ( Hoja de datos )
| Número de pieza | LTC3550 | |
| 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 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
|
No Preview Available !
LTC3550
Dual Input USB/AC Adapter
Li-Ion Battery Charger with
600mA Buck Converter
www.datasheet4u.com
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
800mA (WALL)
500mA (USB)
301k
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
1 page  
LTC3550
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Regulated Charger Output (Float)
Voltage vs Charge Current
www.data4.s2h6 eet4u.com
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 G01
IUSB Pin Voltage vs Temperature
(Constant-Current Mode)
1.008
HPWR = 5V
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 75 100
TEMPERATURE (°C)
Charge Current
vs IUSB Pin Voltage
3550 G04
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 G06
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 G02
IUSB Pin Voltage vs Temperature
(Constant-Current Mode)
0.208
HPWR = 0V
0.206
0.204
0.202
0.200
0.198
VUSBIN = 8V
VUSBIN = 4.3V
0.196
0.194
0.192
–50 –25
0
25 50 75
TEMPERATURE (°C)
100
3550 G43
⎯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 G07
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 G03
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 G05
⎯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 G08
3550fa
5
5 Page 
LTC3550
PI FU CTIO S
DCIN (Pin 16): Wall Adapter Input Supply Pin. Provides
power to the battery charger. The maximum supply
wwwc.duartareshneteits4u9.c5om0mA. 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
HPWR 13
RHPWR
10mA MAX
PWR 4
+
4.15V
–
DCIN UVLO
+
DC
SOFT-
START
USB
SOFT-
START
+
–
USBIN UVLO
+
3.95V
OSC
FREQ
SHIFT
SLOPE
COMP
ITH
BURST
CLAMP
EA
0.6V
10mA MAX
CHRG 5
BAT –
EN 12
LOGIC
RECHRG
TRICKLE
TERM
REN
+
RECHARGE
–
TRICKLE
CHARGE
4.1V
BAT
DC_ENABLE
USB_ENABLE
CHARGER CONTROL
2.9V
+
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
5Ω
6 VFB
7 VCC
10 SW
3
ITERM
RITERM
14
IDC
RIDC
2
IUSB
RIUSB
11
RUN
8, 9, 17 3550 BD
GND
3550fa
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC3550.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC3550 | Dual Input USB/AC Adapter Li-Ion Battery Charger | Linear Technology |
| LTC3550-1 | Dual Input USB/AC Adapter Li-Ion Battery Charger | Linear Technology |
| LTC3552 | Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter | Linear Technology |
| LTC3552-1 | Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter | 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 |