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參數(shù)資料
| 型號(hào)： | LTC1730-4 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Lithium-Ion Battery Pulse Charger(4.1V鋰離子電池脈沖充電器) |
| 中文描述： | 1 A BATTERY CHARGE CONTROLLER, PDSO16 |
| 封裝： | SSOP-16 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大小： | 166K |
| 代理商： | LTC1730-4 |
LTC1730-4/LTC1730-4.2
7
time-off period. The length of the timer is programmed by
an external capacitor from the TIMER pin to ground. The
total charge time is:
Time = (3 Hour)(C
TIMER
/0.1
μ
F)
The timer starts when the input voltage (at least 40mV
greater than V
BAT
) is applied and the potential at the NTC/
SHDN pin is between 0.5 V
CC
and 0.875 V
CC
. After a
time-out has occurred, the charging stops and the CHRG
pin becomes high impedance.
CHRG Status Output Pin
This output requires a pull-up resistor and can be used to
indicate three charger conditions. When fast charging
begins, an N-FET (capable of driving an LED) is turned on,
pulling this pin to ground. Once the duty cycle at the GATE
pin drops to 10%, the N-FET turns off and a 40
μ
A current
source to ground turns on. When a time-out occurs or the
input supply is removed, the CHRG pin goes high imped-
ance indicating that charging has stopped. By using two
different value resistors, a microprocessor can detect
three states from this pin: charging,
C
/10 and stop charg-
ing (see Figure 1).
expired, the CHRG pin will become high impedance and
the 620k resistor will then pull the pin high to indicate the
charging has stopped.
End-of-Charge (C/10)
The LTC1730 includes a comparator to monitor the duty
cycle at the GATE pin to detect an end-of-charge condition.
When the duty cycle falls below 10%, the comparator trips
and turns off the N-MOSFET at the CHRG pin and switches
in a weak (40
μ
A) current source to ground. The end-of-
charge comparator is disabled in trickle charge mode.
Internal Pass Transistor
An N-MOSFET (0.35
) is included in the LTC1730 as the
pass transistor. The gate of the N-FET is controlled by an
internal charge pump. The body of this N-FET is connected
to ground instead of source terminal. There is no body
diode from the BAT pin back to the V
CC
pin; therefore, no
blocking diode is required in series with the battery or the
input supply. This will not only reduce the cost but also the
heat generated while in fast charge mode. An internal
thermal shutdown circuit turns the pass transistor off
when the die temperature exceeds approximately 140
°
C
with 10
°
C of thermal hysteresis.
Gate Drive
The N-MOSFET gate drive consists of a regulated 10
μ
A
current source charge pump. A series RC network is
required from the GATE pin to the V
CC
pin. When the
N-MOSFET is turned on, the voltage at the V
CC
pin will start
slewing down to a voltage equal to V
BAT
plus the voltage
drop across the pass transistor and R
SENSE
. The slew rate
is equal to 10
μ
A/C. By ramping the V
CC
pin down slowly,
the inrush current is reduced. The resistor in series with
the capacitor is required to limit the transient current when
the input supply is first applied.
When the charge pump is turned off, a 40
μ
A current
source to ground will start pulling the GATE voltage down.
Once the pass transistor is off, the voltage at the V
CC
pin
will begin slewing up with the rate equal to 40
μ
A/C. With
this external capacitor, the voltage at the V
CC
pin is then
ramping at a controlled manner (Figure 2).
APPLICATIU
W
U
U
CHRG
1730 F01
V
CC
LTC1730
V
+
V
DD
2k
620k
3
2
OUT
IN
MICROPROCESSOR
Figure 1. Interfacing with Microprocessor
When the LTC1730 is in charge mode, the CHRG pin is
pulled down by an internal N-MOSFET. To detect this
mode, force the digital output pin, OUT, high and measure
the voltage at the CHRG pin. The N-MOSFET will pull the
pin low even with a 1k pull-up resistor. Once the charge
current drops to 10% of the full scale current (
C
/10), the
N-MOSFET is turned off and a 40
μ
A current source is
connected to the CHRG pin. By forcing the OUT pin into a
high impedance state, the current source will pull the pin
low through the 620k resistor. When the internal timer has
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| LTC1730EGN-4 | 功能描述:IC BATT PULSE CHRGR LI-ION16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1730EGN-4#PBF | 功能描述:IC BATT PULSE CHRGR LI-ION16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1730EGN-4#TR | 功能描述:IC BATT PULSE CHRGR LI-ION16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1730EGN-4#TRPBF | 功能描述:IC BATT PULSE CHRGR LI-ION16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
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