OCP8020.pdf 데이터시트 (총 5 페이지) - 파일 다운로드 OCP8020 데이타시트 다운로드

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„ 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
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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
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OCP8020
Standalone Linear Lithium Battery Charger
„ Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Input Supply Voltage
PROG Voltage
BAT Voltage
CHRG Voltage
BAT Short-Circuit Duration
VCC
VPROG
VBAT
VCHRG
BAT Pin Current
PROG Pin Current
Maximum Junction Temperature
IBAT
IPROG
TJ
Storage Temperature
TS
Lead Temperature(Soldering, 10sec)
Note 1: Exceeding the absolute maximum rating may damage the device.
„ Operating Rating (Note 2)
Rating
10
VCC+0.3
7
10
Continuous
800
800
125
-65 to +125
300
Unit
V
V
V
V
mA
µA
Parameter
Symbol
Input Supply Voltage
VIN
Operating Temperature Range
TOP
Note 2: The device is not guaranteed to function outside its operating rating.
Rating
-0.3 to 10
-40 to +85
Unit
V
„ Electrical Characteristics
(VIN=5V, VOUT=1.8V, TJ=25, Unless otherwise noted)
Symbol
VCC
Parameter
Input Supply Voltage
ICC Input Supply Current
VFLOAT
Regulated Output
(Float) Voltage
IBAT BAT Pin Current
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ITRIKL
VTRIKL
VUV
VUVHYS
VMSD
VASD
ITERM
Trickle Charge Current
Trickle Charge
Threshold Voltage
VCC Undervoltage
Lockout Threshold
VCC Undervoltage
Lockout Hysteresis
Manual Shutdown
Threshold Voltage
VCC-VBAT Lockout
Threshold Voltage
C/10 Termination
Current Threshold
Conditions
Charge Mode(Note 3), RPROG=10K
Standby Mode(Charge Terminated)
Shutdown Mode (RPROG Not Connected,
VCCVBAT, or VCCVUV)
0℃≤TJ85, IBAT=40mA
Current Mode , RPROG=10K
Current Mode , RPROG=2K
Standby Mode, VBAT=4.2V
Shutdown Mode(RPROG Not Connected)
Sleep Mode, VCC=-0V
VBATVTRIKL, RPORG=10K
RPROG=10K, VBAT Rising
From VCC Low to High
PROG Pin Rising
PROG Pin Falling
VCC from Low to High
VCC from High to Low
RPROG=10K(Note 4)
RPROG=2K
Min.
4.25
Typ.
190
85
25
Max.
6.5
Unit
V
µA
µA
µA
4.2 V
110 mA
500 mA
4 µA
±1 µA
±1 µA
12 mA
2.9 V
3.4 V
170
1.25
1.2
100
30
0.1
0.1
mV
V
V
mV
mV
mA/mA
mA/mA
Page2 - 5
Rev. 1.0 Jul. 25, 2006
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OCP8020
Standalone Linear Lithium Battery Charger
„ Electrical Characteristics (Continued)
(VIN=5V, VOUT=1.8V, TJ=25, Unless otherwise noted)
Symbol
VPROG
Parameter
PROG Pin Voltage
Conditions
Current Mode, RPROG=10K
Min. Typ. Max. Unit
1.03 V
ICHRG
CHRG Pin Weak Pull
Down Current
VCHRG=5V
20 µA
VCHRG
CHRG Pin Output Low
Voltage
ICHRG=5mA
0.35 V
ΔVRECHRG
Recharge Battery
Threshold Voltage
VFLOAT-VRECHRG
100 mV
TLIM
Thermal Protection
Temperature
120
tss
tRECHRG
Soft-Start Time
Recharge Comparator
Filter Time
IBAT=0 to 1000V/RPROG
VBAT High to Low
100 µs
2 ms
tTERM
Termination Comparator
Filter Time
IBAT Falling Below ICHG/10
1000
µs
IPROG
PROG Pin Pull-Up
Current
1 µA
Note 3: Supply current includes PROG pin current (approximately 100µA) but does not include any current delivered
to the battery through the BAT pin (approximately 100mA).
Note 4: ITERM is expressed as a fraction of measured full charge current with indicated PROG resistor.
„ Application Circuit
VIN=4.5V to 6.5V
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LED
330
VCC
BAT
CHRG
PROG
GND
600mA
1.65k
4.2V Li-Ion Battery
600mA Single Cell Li-Ion Charger
Page3 - 5
Rev. 1.0 Jul. 25, 2006
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