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PDF SC805A Data sheet ( Hoja de datos )
| Número de pieza | SC805A | |
| Descripción | Miniature Integrated High Current Lithium-Ion Battery Charger | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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SC805A
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The SC805A is a fully integrated, single cell, constant-
current (CC)/constant-voltage (CV) Lithium-Ion battery
charger in a tiny 3x3 mm thermally enhanced lead-free
MLP package. The SC805A can operate as a stand-alone
charger or in conjunction with a Power Management Inte-
grated Circuit (PMIC).
The SC805A has a pre-charge function for trickle charging
deeply discharged batteries. The fast-charge current is
enabled automatically when the battery voltage reaches
the required threshold. When the battery reaches the
constant voltage or CV portion of the charge curve, the
SC805A switches to CV regulation mode. In this mode
the output current decays as the battery charges until the
termination current is reached and the SC805A signals the
charge cycle is complete. The SC805A can be configured
to continue charging for a pre-determined time before
turning off, or to turn off immediately upon termination.
After turning off its output, the SC805A enters monitor
mode. If the battery voltage drops by 100mV from the
CV voltage a new charge cycle will begin. The timer
function also protects against charging faulty batteries by
turning off if the pre-charge time exceeds ¼ of the total
programmed charge duration.
The SC805A also provides battery detection, and a battery
NTC thermistor interface to disable charging when the
battery temperature exceeds safe-to-charge limits.
Fully integrated charger with FET pass transistor,
Reverse-blocking diode, sense resistor and thermal
protection
High accuracy charge current*
Tiny 3mm x 3mm 10-lead MLPD package
Programmable pre-charge, fast-charge and
termination current
Battery voltage controlled to 1% accuracy
Built-in timer for protection and complete charging
NTC interface with battery detection
Soft-start to reduce adapter in-rush current
Up to 1A continuous charge current
Input voltage range from 3V to 6V allows seamless
charging from current limited adapter
ApPprloicviadetisoandsapter voltage VCCIL to power external
accessories
Battery present detection and output indicator
Operates in charger or LDO-Mode without battery
0.1µA battery drain current in shutdown and monitor
modes
Over-current protection in all charging modes
CHRGB output communicates charging and
end-of-charge cycle
*US Patent 6,836,095
Applications
The SC805A can also function as a general purpose current
source or as a current source for charging nickel-cadmium
(NiCd) and nickel-metal-hydride (NiMH) batteries.
Typical Application Circuit
Cellular Phones
PDAs
Handheld Meters
Charging Stations
USB Chargers
Digital Cameras
Programmable Current Source
CHARGER VIN
March 3, 2007
C1
1µF
Adapter
Present
Indicator
D1
LED
R1
3.01k
R2
3.01k
RT1
Thermistor
SC805A Typical Application Circuit
SC805A
1 VCC
VOUT 3
2 VCCIL CHRGB 10
7 EN/NTC ITERM 5
8 NOBAT IPRGM 4
9 RTIME
GND 6
R4
3.01k
R3
39.2k
R5
3.01k
Charge
Complete
Indicator
D2
LED
R6
1k
D3
LED
R7
1k
Charging
Indicator
BATTERY
C1
2.2µF
www.semtech.com
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POWER MANAGEMENT
Pin Configuration
VCC 1
VCCIL 2
VOUT 3
IPRGM 4
ITERM 5
Top View
SC805A
T
10 CHRGB
9 RTIME
8 NOBAT
7 EN/NTC
6 GND
MLP-10 3mm x 3mm 10 Lead
SC805A
Ordering Information
Device
SC805AMLTRT(2)
SC805AEVB
Package(1)
MLP-10
Evaluation Board
Notes:
(1) Only available in tape and reel packaging. A reel contains 3000 devices.
(2) Lead-free product. This product is fully WEEE and RoHS compliant.
Marking Information
805A
yyww
xxxx
Marking for the 3x3mm MLPD-10 Lead Package:
nnnn = Part Number (Example: 805A)
yyww = Datecode (Example: 0652)
xxxx = Semtech Lot No. (Example: E901)
2007 Semtech Corp.
www.semtech.com
5 Page 
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SC805A
POWER MANAGEMENT
Applications Information (Cont.)
Over-Current and Max Temperature Protection
Over-current protection is inherent in all modes of opera-
tion. When the device is in charge-mode the output is cur-
rent-limited to either the pre-charge current limit value or
the fast-charge current limit value depending on the voltage
at the output. When the device is in LDO mode, the output
current is limited to the fast-charge current limit. Max die
temperature protection is included on the SC805A. This
feature allows the SC805A to operate with maximum power
dissipation by disabling the output current when the die
temperature reaches OT. The result is that the SC805A
will operate as a pulse charger in extreme power dissipa-
tion applications delivering the maximum allowable output
current while regulating the internal die temperature to a
safe level.
pin and the battery terminal. Keep the Adapter+ to SC805A
VCC input trace wide to minimize voltage drops that will
add to the dropout voltage of the SC805A. The GND pin
of the SC805A should be connected in a Kelvin fashion at
the battery-terminal to eliminate voltage drops in the return
path which reduce the regulated battery voltage.
The thermal performance of the SC805A package requires
a low impedance connection from the heat slug on the
bottom of the package to an external ground plane. This
is best accomplished by using a single large via under the
device connected to a ground plane on the bottom exposed
side of the PCB. The evaluation board uses 1 square inch
of copper on the bottom of the PCB and is capable of 1A
charging current.
Layout Guidelines
The two most critical aspects of the PCB layout are the
power path and thermal layout. The power path starts
at the Adapter + input and runs to the VCC input of the
SC805A, then from the VOUT pin of the SC805A to the Bat-
tery + terminal, and completes with the return trace from
the battery - terminal to the adapter - input. All of these
traces need to be designed to handle the required charging
current. The trace from VOUT of the SC805A is most critical
and should be made as wide as possible to minimize I×R
drops between the regulated voltage at the SC805A VOUT
The input and output bulk decoupling capacitors for the
SC805A should be placed near the external terminals for
the adapter and battery. This short low impedance loop
is for the high current spikes that result from input/output
hot-plugging of the charger. To minimize these current
spikes the value of the decoupling capacitor should be mini-
mized. A typical application requires a 0.1µF input/output
capacitor. If the distance from the external terminals to
the SC805A is greater than 1 inch, 0.1µF local decoupling
capacitors at the SC805A may be required.
2007 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet SC805A.PDF ] | |
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