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參數(shù)資料
| 型號： | ISL9209BIRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Charging System Safety Circuit |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封裝： | 4 X 3 MM, ROHS COMPLIANT, PLASTIC, MO-229WGED-4, DFN-12 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大小： | 597K |
| 代理商： | ISL9209BIRZ |
9
FN6400.0
March 21, 2007
Warning Indication Output
The WRN pin is an open-drain output that indicates a LOW
signal when any of the three protection events happens. This
allows the microprocessor to give an indication to the user to
further enhance the safety of the charging system.
Applications Information
The ISL9209B is designed to meet the “Lithium-Safe” criteria
when operating together with the ISL6292 family Li-ion
battery chargers. The “Lithium-Safe” criteria requires the
charger output to fall within the green region shown in
Figure 23 under normal operating conditions and NOT to fall
in the red region when there is a single fault in the charging
system. Taking into account the safety circuit in a Li-ion
battery pack, the charging system is allowed to have two
faults without creating hazardous conditions for the battery
cell. The output of any ISL6292 family chargers, such as the
ISL6292C, has a typical I-V curve shown with the blue lines
under normal operation, which is within the green region.
The function of the ISL9209B is to add a redundant
protection layer such that, under any single fault condition,
the charging system output does not exceed the I-V limits
shown with the red lines. As a result, the charging system
adopting the ISL9209B and the ISL6292C chip set can
easily pass the “Lithium-Safe” criteria test procedures.
The ISL9209B is a simple device that requires only three
external components, in addition to the ISL6292 charger
circuit, to meet the “Lithium-Safe” criteria, as shown in the
“Typical Application Circuit” on page 1. The selection of the
current limit resistor R
ILIM
is given in the “Overcurrent
Protection (OCP)” on page 8.
R
VB
Selection
The R
VB
prevents a large current from the VB pin to the
battery terminal in case the ISL9209B fails. The
recommended value should be between 200k
Ω
to 1M
Ω
.
With 200k
Ω
resistance, the worst case current flowing from
the VB pin to the charger output is:
assuming the VB pin voltage is 30V under a failure mode
and the battery voltage is 4.2V. Such a small current can be
easily absorbed by the bias current of other components in
the handheld system. Increasing the R
VB
value reduces the
worst case current, but at the same time increases the error
for the 4.34V battery OVP threshold.
The error of the battery OVP threshold is the original
accuracy at the VB pin (given in “Electrical Specifications” on
page 2) plus the voltage built across the R
VB
by the VB pin
leakage current. The VB pin leakage current is less than
20nA, as given in “Electrical Specifications” on page 2. With
the 200k
Ω
resistor, the worst-case additional error is 4mV
and with a 1M
Ω
resistor, the worst-case additional error is
20mV.
Interfacing to MCU
The ISL9209B has the enable (EN) and the warning (WRN)
digital signals that can be interfaced to a microcontroller unit
(MCU). Both signals can be left floating if not used. When
interfacing to an MCU, it is highly recommended to insert a
resistor between the ISL9209B signal pin and the MCU
GPIO pin, as shown in Figure 24. The resistor creates an
isolation to limit the current, in case a high voltage shows up
at the ISL9209B pins under a failure mode. The
recommended resistance ranges from 10k
Ω
to 100k
Ω
. The
selection of the R
EN
is dependent on the IO voltage (VIO) of
the MCU. R
EN
should be selected so that the ISL9209B EN
pin voltage is above the disable threshold when the GPIO
output of the MCU is high.
Capacitor Selection
The input capacitor (C
1
in the “Typical Application Circuit” on
page 1) is for decoupling. Higher value reduces the voltage
drop or the over shoot during transients.
30V
4.2V
–
(
)
200k
Ω
(
)
130
μ
A
=
(EQ. 2)
FIGURE 23. LITHIUM-SAFE OPERATING REGIONS
5
0
1000
BATTERY VOLTAGE (V)
C
1
2
3
4
ISL9209
LIMITS
ISL6292C
LIMITS
6
FIGURE 24. DIGITAL SIGNAL INTERFACE BETWEEN
ISL9209B AND MCU
R
5
R
5
Q
4
Q
5
ISL9209
MCU
R
PU
R
PU
R
R
WRN
R
EN
VIO
WRN
EN
R
EN
Q
5
ISL9209B
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| ISL9209 | Charging System Safety Circuit |
| ISL9209IRZ | Charging System Safety Circuit |
| ISL9209IRZ-T | Charging System Safety Circuit |
| ISL9212A | Charging System Safety Circuit |
| ISL9212AIRZ | Charging System Safety Circuit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL9209BIRZ-T | 功能描述:IC SAFETY SYSTEM CHARGER 12-TDFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| ISL9209C | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Charging System Safety Circuit |
| ISL9209CIRZ | 功能描述:IC SAFETY SYSTEM CHARGER 12-TDFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
| ISL9209CIRZ-T | 功能描述:IC SAFETY SYSTEM CHARGER 12-TDFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
| ISL9209IRZ | 功能描述:IC SAFETY SYSTEM CHARGER 12-TDFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
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