參數(shù)資料
型號(hào)： LTC4060
廠商： Linear Integrated Systems
英文描述： Standalone Linear NiMH/NiCd Fast Battery Charger
中文描述： 獨(dú)立線性鎳氫/鎳鎘電池快速充電器
文件頁(yè)數(shù)： 13/20頁(yè)
文件大?。?/td> 195K
代理商： LTC4060
13
LTC4060
4060f
resistor to the PROG pin can also be used to program
current. Note that this will alter the timer periods unless
alternate TIMER pin capacitors are also programmed
through an analog switch.
The PROG pin provides a reference voltage of 1.5V (V
PROG
)
that may be tapped for system use. Current loading on
PROG is multiplied by 930 and appears as increased I
MAX.
This may be compensated by adjustment of
R
PROG
. Total
PROG pin current must be limited to 2.3mA otherwise
absolute maximum ratings will be exceeded. When the
LTC4060 is in the shutdown mode, the PROG pin is forced
to ground potential to save power.
Programming the Timer
All LTC4060 internal timing is derived from the internal
oscillator that is programmed with an external capacitor at
the TIMER pin. The time periods shown in Table 1 scale
directly with the timer period. The programmable safety
timer is used to put a time limit on the entire charge cycle
for the case when charging has not otherwise terminated.
The time limit is programmed by an external capacitor at
the TIMER pin and is also dependent on the current set by
the programming resistor connected to the PROG pin. The
time limit is determined by the following equation:
t
MAX
(Hours) = 1.567 10
6
R
PROG
(
) C
TIMER
(F)
C
F
t
Hours
R
TIMER
MAX
PROG
( )
(
)
.
( )
=
1 567 10
6
Some typical timing values are detailed in Table 1. The
timer begins at the start of a charge cycle. After the time-
out occurs, the charge current stops and the CHRG output
assumes a high impedance state to indicate that the
charging has stopped.
Excessively short time-out periods may not allow enough
time for the battery to receive full charge or may result in
premature –
V termination due to too short a battery
voltage stabilization hold-off period. Excessively long time-
out periods may indicate too low a charge current which
may not allow voltage-based termination (–
V) to work
properly. Time-out limits of less than 0.75 hour for faster
2C charge rates, or more than 3.5 hours for slower C/2
APPLICATIU
W
U
U
charge rates, are generally not recommended. Consult the
battery manufacturer for recommended periods.
An external timing source can also be used to drive the
TIMER pin for precise or programmed control. The high
level must be between 2.5V and V
CC
and the low level must
be between 0V and 0.25V. Also, the driving source must be
able to overdrive the internal current source and sink
which is 5% of the current through R
PROG
.
Battery Temperature Sensing
Temperature sensing is optional in LTC4060 applications.
To disable temperature qualification of all charging opera-
tions, the NTC
pin must be wired to ground. A circuit for
temperature sensing using a thermistor with a negative
temperature coefficient (NTC) is shown in Figure 2. Inter-
nally derived V
CC
proportional voltages (V
CLD
, V
HTI
, V
HTC
)
are compared to the voltage on the NTC input pin to test the
temperature thresholds. The battery temperature is mea-
sured by placing the thermistor close to the battery pack.
In Figure 2, a common 10k NTC thermistor such as a
Murata NTH4G series NTH4G39A103F can be used. R
HOT
should be a 1% resistor with a value equal to the value of
the chosen NTC thermistor at 45
°
C (V
NTC
= V
HTI
= 0.5 V
CC
typ). Another temperature may be chosen to suit the
battery requirements. The LTC4060 will not initiate a
charge cycle or continue with a precharge if the value of the
thermistor falls below 4.42k which is a temperature rising
to approximately 45
°
C. However, once fast charging is in
progress, it will not be stopped until the thermistor drops
below 3k which is a temperature rising to approximately
55
°
C (V
NTC
= V
HTC
= 0.4 V
CC
typ). Once reaching this
charge cutoff threshold, charging is suspended until the
value of the thermistor rises above approximately 4.8k
(falling temperature) or approximately 43
°
C (45
°
C – 2
°
C
hysteresis at V
CC
= 5V) and then charging is resumed.
Hysteresis avoids possible oscillation about the trip points.
Note that the comparator hysteresis voltages are constant
and when V
CC
increases the signal level from the ther-
mistor increases thus making the temperature hysteresis
look smaller.
During suspension the charge current is turned off and the
safety timer is frozen. The LTC4060 is also designed to
suspend when the thermistor rises above 34k (falling
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LTC4060EDHC#TRPBF 功能描述:IC BATT CHARGER NIMH/NICD 16DFN 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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