EUP8092AJIR1 [EUTECH]
Power Management Circuit;
| 型号： | EUP8092AJIR1 |
| 厂家： | 
EUTECH MICROELECTRONICS INC |
| 描述： | Power Management Circuit |
| 文件： | 总15页 (文件大小：909K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EUP8092X
1.5A Linear Li-Ion/Polymer Charger IC
with Integrated FET and Charger Timer
FEATURES
DESCRIPTION
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Very Low Power Dissipation
The EUP8092X series are highly integrated single cell
Li-Ion/Polymer battery charger IC designed for handheld
devices. This charger is designed to work with various
types of AC adapters or a USB port and capable of
operating with an input voltage as low as 2.65V.
Accepts Multiple Types of Adapters or USB BUS
Power
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Integrated Power FET and Current Sensor for Up
to 1.5A Charge Applications
The EUP8092X operates as a linear charger and charges
the battery in three phases: trickle current, constant current,
and constant voltage. When AC-adapter is applied, an
external resistor sets the magnitude of the charge current,
which may be programmed up to 1.5A with TDFN10
package and a current-limited adapter for lowest power
dissipation.
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Guaranteed to Operate at 2.65V After Start-Up
Charge Termination by Minimum Current and
Time
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Precharge Conditioning With Safety Timer
Reverse Leakage Protection Prevents Battery
Drainage
The EUP8092X features thermal regulation loop to control
charge current to keep safe operation when PCB lacked of
enough heat-sinking. A programmable charge timer
provides a backup safety for termination. The EUP8092X
automatically re-starts the charge if the battery voltage
falls below an internal threshold and automatically enters
sleep mode when DC supplies are removed. No external
sense resistor or blocking diode is required for charging. A
NTC thermistor interface is used for charging the battery
in a safe temperature range.
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Charge Current Thermal Regulation
Status Outputs for LED or System Interface
Indicates Charge and Fault Conditions
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Optional Battery Temperature Monitoring Before
and During Charge
Automatic Sleep Mode for Low-Power
Consumption
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Available in 3mm× 3mm TDFN-10 Package
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
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PDAs, Cell Phones and Smart Phones
Portable Instruments.
Stand-Alone Charger.
USB Bus Powered Charger.
Typical Application Circuit
Figure 1. EUP8092D
DS8092X Ver 0.1 May 2008
1
EUP8092X
Typical Application Circuit (continued)
Figure 2. EUP8092A,B,C
Block Diagram
Figure 3.
DS8092X Ver 0.1 May 2008
2
EUP8092X
Pin Configurations
Package Type
Pin Configurations
Package Type
Pin Configurations
EUP8092A.B.C
TDFN-10
EUP8092D
TDFN-10
Pin Description
PIN
A
B
C
D
DESCRIPTION
VIN
1
1
1
1
VIN is the input power source. Connect to a wall adapter.
FAULT is an open-drain output indicating fault status. This pin is pulled to
2
3
2
3
2
3
2
3
FAULT
LOW under any fault conditions.
STATUS is an open-drain output indicating charging and inhibit states. The
STATUS pin is pulled LOW when the charger is charging a battery.
The TIME pin determines the oscillation period by connecting a timing
capacitor between this pin and GND.
STATUS
TIME
4
4
4
4
The oscillator also provides a time reference for the charger.
GND
EN
5
6
5
6
5
6
5
6
GND is the connection to system ground.
EN is the enable logic input. Connect the EN pin to LOW to disable the
charger or leave it floating to enable the charger.
This is a 2.8V reference voltage output. This pin outputs a 2.8V voltage
source when the input voltage is above POR threshold and outputs zero
otherwise. The V2P8 pin can be used as an indication for adapter presence.
V2P8
IREF
7
8
9
7
8
9
7
8
9
7
8
-
This is the programming input for the constant charging current.
VSEN is the remote voltage sense pin. Connect this pin as close to the
battery positive terminal as possible. If the VSEN pin is left floating, its
voltage drops to zero volt and the charger operates in trickle mode.
TEMP is the input for an external NTC thermistor. The TEMP pin is also
used for battery removal detection.
VSEN
TEMP
VBAT
-
-
-
9
VBAT is the connection to the battery. Typically a 1µF Tantalum capacitor
10
10
10
10 is needed for stability when there is no battery attached. When a battery is
attached, only a 0.1µF ceramic capacitor is required.
DS8092X Ver 0.1 May 2008
3
EUP8092X
Ordering Information
Package
Type
Operating Temperature
Range
Order Number
Marking
VBAT (V) VSEN
TEMP TIMEOUT
xxxxx
8092A
3H
xxxxx
8092B
3H
xxxxx
8092C
3H
xxxxx
8092D
3H
EUP8092AJIR1
TDFN-10
-20 °C to 70°C
-20 °C to 70°C
-20 °C to 70°C
-20 °C to 70°C
4.2
4.2
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES
EUP8092BJIR1
EUP8092CJIR1
EUP8092DJIR1
TDFN-10
TDFN-10
TDFN-10
4.256
4.2
NO
YES
EUP8092X- □ □
□ □
Lead Free Code
1: Lead Free 0: Lead
Packing
R: Tape& Reel
Operating temperature range
I: Industry Standard
Package Type
J: TDFN-10
DS8092X Ver 0.1 May 2008
4
EUP8092X
Absolute Maximum Ratings
Supply Voltage (VIN) --------------------------------------------------------------------------------- -0.3V to 7V
Output Pin Voltage (BAT) ------------------------------------------------------------------------- -0.3V to 5.5V
Signal Input Voltage (TOEN,TIME, IREF, IMIN) ----------------------------------------------- -0.3V to 7V
Output Pin Voltage (STATUS , FAULT) ----------------------------------------------------- -0.3V to 5.5V
Junction temperature range, TJ -------------------------------------------------------------------------
150°C
Storage temperature range, Tstg ------------------------------------------------------------- -65°C to 150°C
Lead temperature (soldering, 10s) --------------------------------------------------------------------
260°C
Dissipation Ratings
Derating Factor
Above TA =25°C
TA < 40°C
Power Rating
θJA
Package
TDFN-10
48°C/W
1.5W
0.0208 W/°C
Recommended Operating Conditions
Min.
4.3
Max.
6.5
Unit
Supply voltage ,VIN
V
Ambient Temperature Range
-20
70
°C
Electrical Characteristics
Typical values are tested at VIN = 5V and +25°C Ambient Temperature, maximum and minimum values are guaranteed
over 0°C to +70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless otherwise noted.
EUP8092
Min. Typ. Max.
Symbol
Parameter
Conditions
Unit
POWER-ON RESET
Rising VIN Threshold
Falling VIN Threshold
3.0
3.4
2.4
4.0
V
V
2.25
2.65
STANDBY CURRENT
ISTANDBY
IVIN
VBAT Pin Sink Current
VIN Pin Supply Current
VIN Pin Supply Current
VIN floating or EN = LOW
-
-
-
-
30
1
3.0
µA
µA
VBAT floating and EN pulled low
VBAT floating and EN floating
-
-
IVIN
mA
VOLTAGE REGULATION
VCH
Output Voltage
Dropout Voltage
4.158 4.20 4.242
V
VBAT = 3.7V, 0.5A, 3X3 package
-
170
-
mV
CHARGE CURRENT
ICHARGE
ITRICKLE
ICHARGE
ITRICKLE
Constant Charge Current
RIREF = 80kΩ, VBAT = 3.7V
0.9
-
1.0
110
450
50
1.1
-
A
Trickle Charge Current
Constant Charge Current
Trickle Charge Current
RIREF = 80kΩ, VBAT = 2.0V
mA
mA
mA
IREF Pin Voltage > 1.2V, VBAT = 3.7V
IREF Pin Voltage > 1.2V, VBAT = 2.0V
400
-
520
-
DS8092X Ver 0.1 May 2008
5
EUP8092X
Electrical Characteristics (continued)
Typical values are tested at VIN = 5V and +25°C Ambient Temperature, maximum and minimum values are guaranteed
over 0°C to +70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless otherwise noted.
EUP8092
Min. Typ. Max.
Symbol
Parameter
Conditions
Unit
CHARGE CURRENT
ICHARGE
ITRICKLE
EOC
Constant Charge Current
IREF Pin Voltage < 0.4V, VBAT = 3.7V
IREF Pin Voltage < 0.4V, VBAT = 2.0V
-
-
-
100
-
mA
mA
mA
Trickle Charge Current
10
End-of-Charge Threshold
80
115
140
RECHARGE THRESHOLD
VRECHRG
Recharge Voltage Threshold
-
4.0
-
V
V
TRICKLE CHARGE THRESHOLD
Trickle Charge Threshold
VMIN
2.7
2.85
3
Voltage
TEMPERATURE MONITORING
Low Battery Temperature
VTMIN
V2P8 = 3.0V
V2P8 = 3.0V
1.45
0.36
-
1.51
0.38
2.25
110
1.57
0.40
-
V
V
Threshold
High Battery Temperature
VTMAX
Threshold
VRMV
TFOLD
Battery Removal Threshold V2P8 = 3.0V
V
Charge Current Foldback
℃
95
125
Threshold
OSCILLATOR
TOSC
Oscillation Period
CTIME = 15nF
2.4
3
3.6
ms
LOGIC INPUT AND OUTPUT
IREF Input High
1.2
-
-
-
-
-
0.1
-
V
V
IREF IMIN Input Low
STATUS/FAULT Sink
Pin Voltage = 0.8V
5
mA
Current
5
4
10 ×0.8V
10 × 0.8V
IO(OUT)
=
(1)
(3)
(2)
IO(PRECHG)
=
RIREF
RIREF
4
10 ×0.8V
IO(EOC)
=
RIREF
DS8092X Ver 0.1 May 2008
6
EUP8092X
Application Information
Figure 4. Operational Flow Chart
DS8092X Ver 0.1 May 2008
7
EUP8092X
Typical Operating Characteristics
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
DS8092X Ver 0.1 May 2008
8
EUP8092X
Typical Operating Characteristics (continued)
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
DS8092X Ver 0.1 May 2008
9
EUP8092X
Typical Operating Characteristics (continued)
Figure 17.
Figure 18.
Figure 19.
DS8092X Ver 0.1 May 2008
10
EUP8092X
OPERATION
The EUP8092 is an integrated charger for single-cell
Li-ion or Li-polymer batteries. As a linear charger, the
EUP8092 charges a battery in the popular constant
current (CC) and constant voltage (CV) profile. The
constant charge current IREF is programmable up to 1.5A
with an external resistor or a logic input. The charge
voltage VCH has 1% accuracy over the entire
recommended
operating
condition
range.
A
thermal-regulation feature removes the thermal concern
typically seen in linear chargers. The charger reduces the
charge current automatically as the IC internal
temperature rises above +110°C to prevent further
temperature rise. The thermal-regulation feature
guarantees safe operation when the printed circuit board
(PCB) is space limited for thermal dissipation.
Figure 20 shows the typical charge curves in a traditional
linear charger powered with a constant-voltage adapter.
From the top to bottom, the curves represent the constant
input voltage, the battery voltage, the charge current and
the power dissipation in the charger. The power
dissipation PCH is given by the following equations:
Figure 20. Typical Charge Curves Using a
Constant-Voltage Adapter
P
=
V
- V
BAT
× I
(1)
CH
IN
CHARGE
where ICHARGE is the charge current. The maximum
power dissipation occurs during the beginning of the CC
mode. The maximum power the IC is capable of
dissipating is dependent on the thermal impedance of the
printed-circuit board (PCB). Figure 20 shows, with
dotted lines, two cases that the charge currents are
limited by the maximum power dissipation capability due
to the thermal regulation.
When using a current-limited adapter, the thermal
situation in the EUP8092 is totally different. Figure 20
shows the typical charge curves when a current-limited
adapter is employed.
The operation requires the IREF to be programmed higher
than the limited current ILIM of the adapter, as shown in
Figure 21. The key difference of the charger operating
under such conditions occurs during the CC mode. The
adapter current is limited, the actual output current will
never meet what is required by the current reference.
Therefore, the main MOSFET becomes a power switch
instead of a linear regulation device. The power
dissipation in the CC mode becomes:
Figure 21. Typical Charge Curves Using a
Current Limited Adapter
Battery Pre-Conditioning
During a charge cycle if the battery voltage is below the
V(MIN) threshold, the EUP8092X applies a precharge
current, ITRICKLE, to the battery. This feature revives
deeply discharged cells. The resistor connected between
the IREF and GND, RIREF, determines the precharge rate.
4
0.8V×10
I
=
(3)
REF
R
IREF
The EUP8092X activates a safety timer, ITRICKLE, during
the conditioning phase. If VMIN threshold is not reached
within the timer period, the EUP8092X turns off the
2
(2)
P
= R
× I
DS(ON) CHARGE
CH
charger and enunciates FAULT on the FAULT pins.
where RDS(ON) is the resistance when the main MOSFET
is fully turned on. This power is typically much less than
the peak power in the traditional linear mode.
DS8092X Ver 0.1 May 2008
11
EUP8092X
Power on Reset (POR)
Battery Charge Current
The EUP8092 resets itself as the input voltage rises
above the POR rising threshold. The V2P8 pin outputs a
2.8V voltage, the internal oscillator starts to oscillate, the
internal timer is reset, and the charger begins to charge
the battery.
The EUP8092X offers on-chip current regulation with
programmable set point. The resistor connected between
the IREF and GND, RIREF, determines the AC charge rate.
There are three ways to program the charge current:
1. driving the IREF pin above 1.3V
2. driving the IREF pin below 0.35V,
3. or using the RIREF as shown in the Typical
Applications.
The EUP8092 has a typical rising POR threshold of 3.4V
and a falling POR threshold of 2.4V.
Signals in a charge cycle are illustrated in Figure 22.
The voltage of IREF is regulated to a 0.8V reference
voltage when not driven by any external source. The
charging current during the constant current mode is
100,000 times that of the current in the RIREF resistor.
Hence, depending on how IREF pin is used, the charge
current is,
V
> 1.3V
500mA
IREF
0.8V
5
R
V
×10 (A)
IREF =
IREF
R
(4)
IREF
< 0.35V
100mA
IREF
The 500mA current is a guaranteed maximum value for
high-power USB port, with the typical value of 450mA.
The 100mA current is also a guaranteed maximum value
for the low-power USB port. This design accommodates
the USB power specification.
Figure 22. Operation Waveforms
Battery Voltage Regulation
The following events initiate a new charge cycle:
• POR,
The voltage regulation feedback is through the VBAT pin.
This input is tied directly to the positive side of the
battery pack. The EUP8092X monitors the battery pack
voltage between the VBAT and GND pins. When the
battery voltage rises to VO(REG) threshold, the voltage
regulation phase begins and the charging current begins
to taper down.
• a new battery being inserted (detected by TEMP pin),
• the battery voltage drops below a recharge threshold
after completing a charge cycle,
• recovery from an battery over-temperature fault,
• or, the EN pin is toggled from GND to floating.
Sleep Mode
As a safety backup, the EUP8092X also monitors the
charge time in the charge mode. If charge is not
terminated within this time period, TIMEOUT, the
EUP8092X turns off the charger and enunciates FAULT
on the FAULT pins.
End-of-Charge (EOC) Current
The EUP8092X enters the low-power sleep mode if
AC-adapter is removed from the circuit. This feature
prevents draining the battery during the absence of input
supply.
Internal Timer
The internal oscillator establishes a timing reference. The
oscillation period is programmable with an external
timing capacitor, CTIME. The oscillator charges the timing
capacitor to 1.5V and then discharges it to 0.5V in one
period, both with 10µA current. The period TOSC is:
The end-of-charge current C/10 sets the level at which
the charger starts to indicate the end of the charge with
the STATUS pin, as shown in Figure 22. The charger
actually does not terminate charging until the end of the
TIMEOUT, as described in the Total Charge Time
section.
6
T
= 0.2 ×10 × C
(seconds)
(5)
OSC
TIME
Recharge
A 15nF capacitor results in a 3ms oscillation period. The
accuracy of the period is mainly dependent on the
accuracy of the capacitance and the internal current
source. The total charge time for the CC mode and CV
mode is limited can be calculated as:
After End-of-charge, the EUP8092X re-starts the charge
once the voltage on the VBAT pin falls below the V(RCH)
threshold. This feature keeps the battery at full capacity
at all times.
DS8092X Ver 0.1 May 2008
12
EUP8092X
C
22
TIMEOUT = 2 × T
OSC
TIME
1nF
(minutes)(6)
= 14 ×
For example, a 15nF capacitor sets the TIMEOUT to be
3.5 hours. The charger has to reach the end-of-charge
condition before the TIMEOUT, otherwise, a TIMEOUT
fault is issued. The TIMEOUT fault latches up the
charger. There are two ways to release such a latch-up:
either to recycle the input power, or toggle the EN pin to
disable the charger and then enable it again.
The trickle mode charge has a time limit of 1/8
TIMEOUT. If the battery voltage does not reach VMIN
within this limit, a TIMEOUT fault is issued and the
charger latches up.
2.8V Bias Voltage
The EUP8092 provides a 2.8V voltage for biasing the
internal control and logic circuit. This voltage is also
available for external circuits such as the NTC thermistor
circuit. The maximum allowed external load is 2mA.
Figure 24. The Internal and External circuit for The
NTC Interface
NTC Thermistor
At the low temperature limit, the TEMP pin voltage is
1.4V, which is 1/2 of the 2.8V bias. Thus,
The EUP8092 uses two comparators (CP2 and CP3) to
form a window comparator, as shown in Figure 23.
When the TEMP pin voltage is “out of the window,”
determined by the VTMIN and VTMAX, the EUP8092 stops
charging and indicates a fault condition. When the
temperature returns to the set range, the charger re-starts
a charge cycle. The temperature window is shown in
Figure 23.
RCOLD
RCOLD + RU 2.8
1.4
1
2
(7)
=
=
⇒ RCOLD = RU
where RU is the pull-up resistor as shown in Figure 24.
On the other hand, at the high temperature limit the
TEMP pin voltage is 0.35V, 1/8 of the 2.8V bias.
Therefore,
RHOT
RHOT + RU
RU
7
0.35
2.8
1
8
(8)
=
=
⇒ RHOT
=
For applications that do not need to monitor the battery
temperature, the NTC thermistor can be replaced with a
regular resistor of a half value of the pull up resistor RU.
Another option is to connect the TEMP pin to the IREF
pin that has a 0.8V output. With such connection, the
IREF pin can no longer be programmed with logic
inputs.
Charge Status Outputs
The open-drain STATUS and FAULT outputs indicate
various charger operations as shown in the following
table. These status pins can be used to drive LEDs or
communicate to the host processor. Note that OFF
indicates the open-drain transistor is turned off.
Figure 23. Critical voltage Levels for Temp Pin
As the TEMP pin voltage rises from low and exceeds the
1.4V threshold, the under temperature signal rises and
does not clear until the TEMP pin voltage falls below the
1.2V falling threshold. Similarly, the over-temperature
signal is given when the TEMP pin voltage falls below
the 0.35V threshold and does not clear until the voltage
rises above 0.398V. The actual accuracy of the 2.8V is
not important because all the thresholds and the TEMP
pin voltage are ratios determined by the resistor dividers,
as shown in Figure 24.
Table 1 summarizes the other two pins.
Table 1. STATUS INDICATIONS
FAULT STATUS
INDICATION
Charge completed with no fault
(Inhibit) or Standby
High
High
High
Low
Low Charging in one of the three modes
High Fault
DS8092X Ver 0.1 May 2008
13
EUP8092X
Current-Limited Adapter
EN Input (Charge Enable)
Figure 25 shows the ideal current-voltage characteristics
of a current-limited adapter. VNL is the no-load adapter
output voltage and VFL is the full load voltage at the
current limit ILIM. Before its output current reaches the
limit ILIM, the adapter presents the characteristics of a
voltage source. The slope rO represents the output
resistance of the voltage supply. For a well regulated
supply, the output resistance can be very small, but some
adapters naturally have a certain amount of output
resistance.
The adapter is equivalent to a current source when
running in the constant-current region. Being a current
source, its output voltage is dependent on the load, which,
in this case, is the charger and the battery.
The EN digital input is used to disable or enable the
charge process. A high-level signal on this pin enables the
charge and a low-level signal disables the charge and
places the device in a low-power mode. A low-to-high
transition on this pin also resets all timers and timer fault
conditions.
Input and Output Capacitor Selection
Typically any type of capacitors can be used for the input
and the output. Use of a 0.47µF or higher value ceramic
capacitor for the input is recommended. When the battery
is attached to the charger, the output capacitor can be any
ceramic type with the value higher than 0.1µF. However,
if there is a chance the charger will be used as an LDO
linear regulator,
recommended.
a
10µF tantalum capacitor is
Figure 25. The Equivalent Circuit of the Charging System Working with Current Limited Adapter
DS8092X Ver 0.1 May 2008
14
EUP8092X
Packaging Information
TDFN-10
MILLIMETERS
INCHES
0.067
SYMBOLS
MIN.
0.70
0.00
2.90
MAX.
0.80
0.05
MIN.
0.028
0.000
0.114
MAX.
A
A1
D
E1
E
0.031
0.002
0.122
3.10
1.70
2.90
0.30
0.18
3.10
0.50
0.30
0.114
0.012
0.007
0.122
0.020
0.012
L
b
e
D1
0.50
2.40
0.020
0.094
DS8092X Ver 0.1 May 2008
15
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