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PDF EUP8218JIR1 Data sheet ( Hoja de datos )
| Número de pieza | EUP8218JIR1 | |
| Descripción | 2A Single Cell Switchmode Li-Ion/Polymer Battery Charger | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
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Preliminary
EUP8218
2A Single Cell Switchmode Li-Ion/Polymer Battery Charger with
System Power-Path Selection and Automatic USB/Charger Detection
DESCRIPTION
The EUP8218 is a highly integrated single cell Li-ion and
Li-polymer battery charger. It integrates a constant-
frequency PWM controller with high accuracy regulation
of input current, charge current, and voltage. It also
provides battery detection, pre-conditioning, charge
termination, and charge status monitoring.
The EUP8218 provides power path selection function.
When the qualified adapter is present, the system is
powered by the adapter. Otherwise, the system is powered
by the battery. It also integrates an USB-
connection-monitoring device used to determine if a
standard USB device or a battery-charging device is
connected.
The EUP8218 charges the battery in three phases:
pre-conditioning, fast-charge constant current and constant
voltage. In all stages, an internal control loop monitors the
IC junction temperature and reduce charge current if the
internal temperature threshold (120°C) is exceeded.
Additionally, a battery pack thermistor monitoring input
(TS) is included that monitors battery temperature for
safety charging.
Charge is terminated when the current reaches 10% of the
fast charge rate. A programmable charge timer offers a
safety back up. The EUP8218 automatically restarts the
charge cycle if the battery voltage falls below an internal
threshold, and enters a low-quiescent current sleep mode
when the input voltage falls below the battery voltage.
The EUP8218 features Dynamic Power Management
(DPM) to reduce the charge current when the input power
limit is reached to avoid over-loading the adapter. A
highly-accurate current-sense amplifier enables precise
measurement of input current from adapter to monitor
overall system power.
The EUP8218 is available in a 28-pin, 4mm × 4mm TQFN
package.
FEATURES
4.5V-20V Input Operating Range
High Integration
- Automatic Power Path Selector Between
Adapter and Battery
- Automatic USB/Charger Detection
- Dynamic Power Management
- Integrated 20V High Side Switching MOSFET
Safety
- Thermal Regulation Loop Throttles Back
Current to Limit Tj=120°C
- Thermal Shutdown
- Battery Thermistor Sense Hot/Cold Charge
Suspend & Battery Detect
- Input Over-Voltage Protection with
Programmable Thereshold
Accuracy
- ±1% Charge Voltage Regulation
- ±10% Charge Current Regulation
- ±10% Input Current Regulation
Less than 25µA Battery Current with Adapter
Removed
Less than 5mA Input Current with Adapter Present
and Charge Disabled
4mm × 4mm TQFN-28 Package
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
Mobile and Smart Phones
Tablet PC
Handheld Devices
DS8218 Ver 0.1 Mar. 2012
1
1 page  
Preliminary
EUP8218
Pin Description (continued)
PIN
ISET
CELL
SRN
SRP
ACSET
OVPSET
COMP
BTST
TQFN-28
13
14
15
16
17
18
20
21
I/O/P
I
I
I
I/P
I
I
O
P
DESCRIPTION
Fast charge current set point. Use a voltage divider from VREF to ISET to AGND
to set the fast charge current:
ICHG=VISET/(20*RSR)
The pre-charge and termination current is internally as one tenth of the charge
current. The charger is disabled when ISET pin voltage is below 40mV and
enabled when ISET pin voltage is above 120mV.
Cell selection pin. Set CELL pin LOW for 1-cell with a fixed 4.2V.
Battery Sense Input. A bypass capacitor of 20µF is required to minimize ripple
voltage. When VBAT is within 90mV of AVCC, the EUP8218 is forced into sleep
mode.
Current Amplifier Sense Input. A sense resistor, RSENSE, must be connected
between the SRN and SRP pins.
Input current set point. Use a voltage divider from VREF to ACSET to AGND to
set this value:
IDPM=VACSET/(20*RAC)
Valid input voltage set point. Use a voltage divider from input to OVPSET to
AGND to set this voltage. The voltage above internal 1.6V reference indicates
input over-voltage, and the voltage below internal 0.5V reference indicates input
under-voltage. LED driven by STAT pin keeps blinking, reporting fault condition.
Compensation, Soft-Start Pin. Charging begins when the COMP pin reaches
850mV. The recommended compensation components are a 2.2µF (or larger)
capacitor and a 0.5k series resistor. A 100µA current into the compensation
capacitor also sets the soft-start slew rate.
PWM high side driver positive supply.
AGND
PGND
22
23
SW
PVCC
24,25
26, 27
AVCC
28
NC
Thermal
Pad
12,19
AGND
P Analog Ground.
Power ground. Ground connection for high-current power converter node. On
P
PCB layout, connect directly to ground connection of input and output capacitors
of the charger. Only connect to AGND through the Thermal Pad underneath the
IC.
P
Switching node, charge current output inductor connection. Connect the 0.047µF
bootstrap capacitor from SW to BTST.
P
Charger input voltage. Connect at least 10µF ceramic capacitor from PVCC to
PGND and place it as close as possible to IC.
IC power positive supply. Place a 1µF ceramic capacitor from AVCC to AGND
P/I and place it as close as possible to IC. Place a 10Ω resistor from input side to
AVCC pin to filter the noise. For 5V input, a 5Ω resistor is recommended.
No connect
Exposed pad beneath the IC. Always solder Thermal Pad to the board, and have
P vias on the Thermal Pad plane star-connecting to AGND and ground plane for
high-current power converter. It dissipates the heat from the IC.
DS8218 Ver 0.1 Mar. 2012
5
5 Page 
Preliminary
EUP8218
Electrical Characteristics (continued)
4.5V ≤V(PVCC, AVCC) ≤20V, –40°C < TJ <+ 125°C, typical values are at TA = 25°C, with respect to AGND (unless
otherwise noted).
Symbol
Parameter
Conditions
TTC INPUT
tprechrg
tfastchrg
Precharge Safety Timer
Fast Charge Timer Range
Fast Charge Timer
Accuracy
Precharge time before fault occurs
Tchg=CTTC*KTTC
KTTC
Timer Multiplier
VTTC_LOW TTC Low Threshold
TTC falling
ITTC TTC Source/Sink Current
VTTC_OSC_HI
TTC oscillator high
threshold
VTTC_OSC_LO
TTC oscillator low
threshold
AC SWITCH (RevFET) DRIVER
VACDRV_REG
Gate Drive Voltage on
RevFET
BATTERY DETECTION
VACDRV -VCMSRC when VAVCC >
VUVLO
tWAKE
Wake timer
Max time charge is enabled
IWAKE
Wake current
RSENSE = 10 mΩ
tDISCHARGE Discharge timer
Max time discharge current is applied
IDISCHARGE Discharge current
IFAULT
Fault current after a timeout
fault
VWAKE
Wake threshold with respect
to VREG To detect battery Measure on SRN
absent during WAKE
VDISCH
Discharge Threshold to
detect battery absent during
discharge
Measure on SRN
INTERNAL PWM
fsw PWM Switching Frequency
CHARGER SECTION POWER-UP SEQUENCING
tCE_DELAY
Delay from ISET above
120mV to start charging
battery
LOGIC IO PIN CHARACTERISTICS
VOUT_LO
STAT Output Low
Saturation Voltage
Sink Current = 5mA
LOGIC IO PIN CHARACTERISTICS
VCELL_LO
CELL pin input low
threshold, 1 cell
CELL pin voltage falling edge
INPUT CHARACTERISTICS
Ioff D+
Off Leakage Current
D+=5V
Ioff D-
Off Leakage Current
D-=5V
OUTPUT CHARACTERISTICS
VOL FLAG1
Maximum LOW Output
Voltage
VAVCC=5V, IOL=20µA
EUP8218
Min. Typ. Max.
1620
1
-10%
1800
1980
10
10%
5.6
0.4
45 50 55
1.5
1
4
500
50 125 200
1
8
2
100
2.9
450 500 550
1.5
0.5
0.5
1
1
0.3
Unit
Sec
hr
min
/nF
V
µA
V
V
V
ms
mA
sec
mA
mA
mV/c
ell
V/cell
kHz
s
V
V
µA
µA
V
DS8218 Ver 0.1 Mar. 2012
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet EUP8218JIR1.PDF ] | |
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