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參數(shù)資料
| 型號(hào)： | UCC3958 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Single Cell Lithium-Ion Battery Protection Circuit |
| 中文描述： | 單節(jié)鋰離子電池保護(hù)電路 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大小： | 289K |
| 代理商： | UCC3958 |
4
UCC3958 -1/-2/-3/-4
APPLICATION INFORMATION
Battery Voltage Monitoring
The battery cell voltage is sampled every 12ms by con-
necting a resistor divider across it and comparing the re-
sulting voltage to a precision internal reference voltage.
Under normal conditions (cell voltage is below Over Volt-
age threshold and above Under Voltage threshold), the
UCC3958 consumes approximately 7
μ
A of current and
the internal MOSFET is turned on with an R
DSON
of
50m
. The UCC3958 contains an on-chip Charge Pump
to ensure that the internal MOSFET gate is driven high
for complete turn-on, reducing power losses. The charge
pump switches and capacitors are all internal.
When the cell voltage falls below the Under Voltage
threshold for two consecutive samples, the IC discon-
nects the load from the battery pack and enters a super
low power mode (nominally 1
μ
A). The pack will remain
in this state until it detects the application of a charger, at
which point controlled charging is enabled. The require-
ment of two consecutive readings below the UV thresh-
old filters out momentary drops in cell voltage due to load
transients, preventing nuisance trips.
If the cell voltage exceeds the Over Voltage threshold for
two consecutive samples, charging is disabled, however
discharge current is still allowed. This feature of the IC is
explained further in the section on Controlled Charge/
Discharge Mode.
PIN DESCRIPTIONS
BNEG
: Connect the negative terminal of the battery to
these pins.
CBPS:
This power supply bypass pin is connected to
PACK+ through an internal 10k resistor. An external
capacitor must be connected between this pin and
BNEG. This capacitor functions as temporary charge
storage
for
high
current
Minimum capacitor value is 0.15
μ
F. This value should be
increased if the CDLY cap is used.
conditions
(short
circuit).
CDLY:
Delay control pin for the short circuit protection
feature. A capacitor connected between this pin and the
BNEG pin will increase the time delay for sensing an
over current condition. This adjustment may be useful in
those applications where high peak load currents may
momentarily exceed the protection circuit’s threshold and
interruption of the battery current would be undesirable.
The nominal delay time is set internally at 350
μ
s
CEB:
Chip Enable Bar. This pin is pulled low (wrt BNEG)
by a 100nA current source. In order to disable the IC, the
user must pull this pin high to PACK+.
LPWARN:
Low Power Warning Indicator. This pin is
forced high when the battery voltage drops below V
TLO
(nominally 2.65V). This pin will stay high until the
detected battery voltage goes above V
TLO
, or UV
condition is declared.
OVUVB:
condition indicator. Under normal operating conditions
this pin is tristated. When an overvoltage (OV) state is
detected, this pin is pulled high. When undervoltage (UV)
condition is detected, this pin is pulled low.
This
pin
is
an
overvoltage/undervoltage
PACK+:
Connect to the positive terminal of the battery.
This pin is available to the user.
PACK-:
These pins should be connected to the negative
terminal of the battery pack (negative terminal available
to the user). The internal FET switch connects this
terminal to the BNEG terminal to give the battery pack
user appropriate access to the battery. In an overcharged
state,
only
discharge
current
overdischarged state, only charge current is permitted.
is
permitted. In
an
SUB:
Do not connect. These pins must be electrically
isolated from all other pins. These pins may be soldered
to isolated copper pads for heatsinking. This will improve
heat transfer, which may be necessary at high load
currents.
0.00
0.02
0.04
0.06
0.08
0.10
2.6
3.0
3.4
3.8
4.2
CELL VOLTAGE
O
Figure 1. Typical Rdson vs Cell Voltage (DP Package
Pin 7 to Pin 10, at 25°C, 1 Amp Load)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC3958DP-1 | 功能描述:IC L-I PROTECTOR CIRCUIT 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品變化通告:BQ77908, BQ77910 Discontinuation 20/Mar/2012 標(biāo)準(zhǔn)包裝:1 系列:- 功能:電池監(jiān)控器，過壓/欠壓保護(hù) 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:5.6 V ~ 35 V 工作溫度:-25°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:38-TFSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:38-TSSOP 包裝:剪切帶 (CT) 其它名稱:296-28784-1 |
| UCC3958DP-3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| UCC3958DP-4 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| UCC3958PWP-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| UCC3958PWP-2 | 功能描述:IC L-I PROTECTOR CIRCUIT 24TSSOP RoHS:否 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(cè)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 |
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