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參數(shù)資料
| 型號(hào)： | ISL6292DCR4-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Li-ion/Li Polymer Battery Charger |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | 4 X 4 MM, PLASTIC, MO-220-VGGC, QFN-16 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 461K |
| 代理商： | ISL6292DCR4-T |
8
where I
CHARGE
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 2 shows, with dotted lines, two cases
that the charge currents are limited by the maximum power
dissipation capability due to the thermal foldback.
When using a current-limited adapter, the thermal situation
in the ISL6292D is totally different. Figure 3 shows the
typical charge curves when a current-limited adapter is
employed. The operation requires the I
REF
to be
programmed higher than the limited current I
LIM
of the
adapter, as shown in Figure 3. The key difference of the
charger operating under such conditions occurs during the
CC mode.
The Block Diagram, Figure 1, aids in understanding the
operation. The current loop consists of the current amplifier
CA and the sense MOSFET Q
SEN
. The current reference I
R
is programmed by the IREF pin. The current amplifier CA
regulates the gate of the sense MOSFET Q
SEN
so that the
sensed current I
SEN
matches the reference current I
R
. The
main MOSFET Q
MAIN
and the sense MOSFET Q
SEN
form a
current mirror with a ratio of 100,000:1, that is, the output
charge current is 100,000 times I
R
. In the CC mode, the
current loop tries to increase the charge current by
enhancing the sense MOSFET Q
SEN
, so that the sensed
current matches the reference current. On the other hand,
the adapter current is limited, the actual output current will
never meet what is required by the current reference. As a
result, the current error amplifier CA keeps enhancing the
Q
SEN
as well as the main MOSFET Q
MAIN
, until they are
fully turned on. Therefore, the main MOSFET becomes a
power switch instead of a linear regulation device. The
power dissipation in the CC mode becomes:
(EQ. 2)
where r
DS(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.
The worst power dissipation when using a current-limited
adapter typically occurs at the beginning of the CV mode, as
shown in Figure 3. The equation EQ.1 applies during the CV
mode. When using a very small PCB whose thermal
impedance is relatively large, it is possible that the internal
temperature can still reach the thermal foldback threshold. In
that case, the IC is thermally protected by lowering the
charge current, as shown with the dotted lines in the charge
current and power curves. Appropriate design of the adapter
can further reduce the peak power dissipation of the
ISL6292D. See the Application Information section for more
information.
Figure 4 illustrates the typical signal waveforms for the linear
charger from the power-up to a recharge cycle. More
detailed Applications Information is given below.
Applications Information
Power on Reset (POR)
The ISL6292D 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 two indication pins, STAT1 and STAT2, indicate LOW.
Figure 4 illustrates the start up of the charger between t
0
to
t
2
The ISL6292D has a typical rising POR threshold of 3.4V
and a falling POR threshold of 2.4V. The 2.4V falling
threshold guarantees charger operation with a current-
limited adapter to minimize the thermal dissipation.
Charge Cycle
A charge cycle consists of three charge modes: trickle mode,
constant current (CC) mode, and constant voltage (CV)
mode. The charge cycle always starts with the trickle mode
until the battery voltage stays above V
MIN
(2.8V typical) for
15 consecutive cycles of the internal oscillator. If the battery
voltage drops below V
MIN
during the 15 cycles, the 15-cycle
counter is reset and the charger stays in the trickle mode.
The charger moves to the CC mode after verifying the
battery voltage. As the battery-pack terminal voltage rises to
the final charge voltage V
CH
, the CV mode begins. The
terminal voltage is regulated at the constant V
CH
in the CV
mode and the charge current is expected to decline. After
the charge current drops below I
MIN
, the ISL6292D indicates
the end-of-charge (EOC) with the STAT1 or STAT2 pin and
terminates. Signals in a charge cycle are illustrated in
Figure 4 between points t
2
to t
5
.
P
CH
R
DS ON
)
I
CHARGE
2
=
FIGURE 4. OPERATION WAVEFORMS
VIN
V2P8
STAT1
STAT2
VBAT
I
CHARGE
15 Cycles to
1/8 TIMEOUT
15 Cycles
POR Threshold
2.8V V
MIN
V
RECHRG
t
0
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
Charge Cycle
Charge Cycle
I
MIN
ISL6292D
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6292DCRZ | 功能描述:電池管理 LINEAR SINGLE CELL LI-ION CHRGR 16LD RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| ISL6292DCRZ-T | 功能描述:電池管理 LINEAR SINGLE CELL LI-ION CHRGR 16LD RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| ISL6292EVAL1 | 功能描述:EVALUATION BOARD 1 ISL6292 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時(shí)/停產(chǎn)零件編號(hào) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ISL6292EVAL1Z | 功能描述:EVAL BOARD 1 FOR ISL6292 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:* 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| ISL6292EVAL2 | 功能描述:EVALUATION BOARD 2 ISL6292 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
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