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OCP8020 데이터시트 PDF




Orient Chip에서 제조한 전자 부품 OCP8020은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 OCP8020 자료 제공

부품번호 OCP8020 기능
기능 Standalone Linear Lithium Battery Charger
제조업체 Orient Chip
로고 Orient Chip 로고


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OCP8020 데이터시트, 핀배열, 회로
„ General Description
OCP8020 is a complete constant-current and
constant-voltage linear charger for single cell
lithium-ion and Lithium-Polymer batteries. Its
SOT23-5L Package and low external component count
make OCP8020 ideally suited for portable applications.
Furthermore, the OCP8020 is specifically designed to
work within USB power specification. At the same time,
OCP8020 can also be used in the standalone
lithium-ion and Lithium-polymer battery charger.
No external sense resistor is needed, and no blocking
diode is required due to the internal MOSFET
architecture. Thermal feedback regulates the charge
current to limit the die temperature during high power
operation or high ambient temperature. The charge
voltage is fixed at 4.2V, and the charge current can be
programmed externally with a single resistor. The
OCP8020 automatically terminates the charge cycle
when the charge current drops to 1/10th the
programmed value after the final float voltage is
reached.
When the input supply (wall adapter or USB supply) is
removed, the OCP8020 automatically enters a low
current stage, dropping the battery drain current to less
than 2µA. The OCP8020 can be put into shutdown
mode, reducing the supply current to 25µA.
Other features include charge current monitor,
undervoltage lockout, automatic recharge and a status
pin to indicate termination and the presence of an input
voltage.
OCP8020
Standalone Linear Lithium Battery Charger
„ Features
z Programmable Charge Current Up to 800mA
z No MOSFET, Sense Resistor or Blocking Diode
Required
z Constant-Current/Constant-Voltage Operation
with Thermal Protection to Maximize Charge Rate
without Risk of Overheating
z Charges Single Cell Li-Ion Batteries Directly from
USB Port
z Press 4.2V Charge Voltage with ± 1% Accuracy
z 25µA. Supply Current in Shutdown
z 2.9V Trickle Charge Threshold
z Available Without Trickle Charge
z Soft-Start Limits Inrush Current
z Available in 5-pin SOT23 Package
„ Applications
z Cellular Telephones, PDA’s, MP3 Players
z Charging Docks and Cradles
z Bluetooth Applications
„ Pin Configuration
(Top View)
CHRG 1
GND 2
BAT 3
5 PROG
4 VCC
„ Block Diagram
www.DataSheet4U.net
120
TDIE
TA
CA
SHDN
CHRG 1
STANDBY
VCC
4
1x
C1
C2+
-
MA 5µA
VA+
-
R3
1V
R4
0.1V
R5
REF
1.21V
1000x
3 BAT
R1
R2
TO BAT
C3+ 2.9V
-
5
PROG
Page1 - 5
3µA
VCC
2
GND
Rev. 1.0 Jul. 25, 2006
www.micro-bridge.com




OCP8020 pdf, 반도체, 판매, 대치품
OCP8020
Standalone Linear Lithium Battery Charger
„ Application Hints
Stability Considerations
The constant-voltage mode feedback loop is stable without an output capacitor provided a battery is connected to
the charge output. With no battery present, an output capacitor is recommended to reduce ripple voltage. When
using high value, low ESR ceramic capacitors, it is recommended to add a 1 resistor in series with the capacitor.
No series resistor is needed if tantalum capacitors are used.
In constant-current mode, the PROG pin is in the feedback loop, not the battery. The constant-current mode stability
is affected by the impedance at the PROG pin. With no additional capacitance on the PROG pin, the charger is
stable with program resistor values as high as 20k. However, additional capacitance on this mode reduces the
maximum allowed program resistor. The pole frequency at the PROG pin should be kept above 100kHz.
VCC Bypass Capacitor
Many types of capacitors can be used for input bypassing, however, caution must be exercised when using
multilayer ceramic capacitors. Because of the self-resonant and high Q characteristics of some types of ceramic
capacitors, high voltage transients can be generated under some start-up conditions, such as connecting the charge
input to a live power source. Adding a 1.5 resistor in series with a ceramic capacitor will minimize start-up voltage
transients.
Power Dissipation
The conditions that cause the OCP8020 to reduce charge current through thermal feedback can be approximated
by considering the power dissipated in the IC. Nearly all of this power dissipation is generated by the internal
MOSFET-this is calculated to be approximately:
PD=(VCC-VBAT)*IBAT
The approximate ambient temperature at which the thermal feedback begins to protect the IC is:
TA=120-PDθJA
TA=120-(VCC-VBAT)*IBAT*θJA
Thermal Considerations
Because of the small size of the thin SOT23 package, it is very important to use a good thermal PC board layout to
maximize the available charge current. The thermal path for the heat generated by the IC is from the die to the
cooper lead frame, through the package leads, (especially the ground lead) to the PC board copper. The PC board
copper is the heat sink. The footprint copper pads should be as wide as possible and expand out to larger copper
areas to spread and dissipate the heat to the surrounding ambient. Other heat sources on the board, not related to
the charger, must also be considered when affect overall temperature rise and the maximum charge current.
„ Ordering Information
OCP8020XXX
www.DataSheet4U.net
Package:
W: SOT23-5L
Packing:
Blank:Tube or Bluk
A:Tape & Reel
Temperature Grade:
D: -40~85
„ Marking Information
DAYM
Page4 - 5
Date code:
Y=Year(1=2001)
M=Month(0~9,O,N,D)
Part Number:
DA: OCP8020
Rev. 1.0 Jul. 25, 2006
www.micro-bridge.com

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관련 데이터시트

부품번호상세설명 및 기능제조사
OCP8020

Standalone Linear Lithium Battery Charger

Orient Chip
Orient Chip

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