- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377766 > LTC1980EGN (LINEAR TECHNOLOGY CORP) Combination Battery Charger and DC/DC Converter PDF資料下載
參數(shù)資料
| 型號(hào)： | LTC1980EGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Combination Battery Charger and DC/DC Converter |
| 中文描述： | BATTERY CHARGE CONTROLLER, 340 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-24 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 463K |
| 代理商： | LTC1980EGN |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)當(dāng)前第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
LTC1980
11
1980i
Transformer current is sensed across R
S
, gained up via U6
and sampled through switch SW1. The current in R7 is a
scaled-down replica of the battery charging current pulses
from the transformer. During battery charging, switch
SW2 is in the down position connecting R7, R8, R9 and C4
to the inverting input of amplifier U10 forming an integra-
tor which closes the outer loop of the converter and
establishes constant current charging. U12 is a g
m
ampli-
fier that clamps U10 as the battery float voltage is reached.
R10 and R11 set the float voltage and C5 compensates this
loop and provides a soft-start function.
OPERATIOU
DC/DC Converter Operation
When the LTC1980 is operating as a DC/DC converter, M1
turns on at the start of the oscillator cycle. When trans-
former current reaches a predetermined level set by U10’s
output voltage, M1 turns off and M2 turns on. SW2 is in the
up position forming an integrator with zero, which com-
pares the output voltage (via R1 and R2 to reference U11
establishing the output voltage.
APPLICATIOU
Setting Battery Charge Current
Referring to the simplified schematic in Figure 4, the
average current through R7 must equal the current through
R
TRKL
with switch SW3 open. This leads to the equation
for setting the trickle charge current:
W
U
U
R
V
R
R
I
A
TRKL
REF
TRICKLE
S
V
=
7
Normal charge current is set via the parallel combination
of R
TRKL
and R
CHRG
which leads to the following equation
for R
CHRG
R
V
–
R
I
I
R
A
CHRG
REF
NORMAL
TRICKLE
S
V
=
(
)
7
–
+
21
U6
A
V
= 2.5
–
+
U10
R
S
I
SENSE
22
20
CAOUT
2
1
PROGT
V
1.218V
22
V
C
C4
R7
10k
R
TRKL
SW1
20
GND
I
R
CHRG
PROG
SW3
1980 F04
Figure 4. Battery Charger Current Control Loop
where A
V
= 2.44 and V
REF
= 1.225V. The suggested value
for R7 is 10k.
Setting the Float Voltage
Pin selectable 4.1V, 4.2V, 8.2V, and 8.4V Li-Ion float
voltages are available. Other float voltages may be set via
external resistors. The following combinations of logic
inputs BATT1 and BATT2 determine the float voltage.
BATT2
0
0
1
1
Don’t Care
BATT1
0
1
0
1
Open
FLOAT VOLTAGE
4.1V
4.2V
8.2V
8.4V
Externally Set via OVP
where logic 0 = GND and logic 1 = V
BIAS2
(Pin 19)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1982ES6 | Single and Dual Micropower High Side Switch Controllers in SOT-23 |
| LTC1981 | Single and Dual Micropower High Side Switch Controllers in SOT-23 |
| LTC1981ES5 | Single and Dual Micropower High Side Switch Controllers in SOT-23 |
| LTC1982 | Single and Dual Micropower High Side Switch Controllers in SOT-23 |
| LTC1983-3 | 100mA REGULATED CHARGE-PUMP INVERTERS IN THINSOT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1980EGN#PBF | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP 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) |
| LTC1980EGN#TR | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP RoHS:否 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) |
| LTC1980EGN#TRPBF | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP 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) |
| LTC1981ES5 | 制造商:Linear Technology 功能描述:MOSFET DRVR 1-OUT Hi Side 5-Pin TSOT-23 |
| LTC1981ES5#PBF | 制造商:Linear Technology 功能描述:MOSFET DRVR 1-OUT Hi Side 5-Pin TSOT-23 制造商:Linear Technology 功能描述:DP-Power Controller, CUT TAPE Single Micropower Hi Side Sw Controller 制造商:Linear Technology 功能描述:DRIVER, MOSFET, HIGH/LOW SIDE, SOT-23, Device Type:MOSFET, Module Configuration:High Side, Low Side, Supply Voltage Min:1.8V, Supply Voltage Max:5.5V, Driver Case Style:SOT-23, No. of Pins:5, Operating Temperature Min:-40C , RoHS Compliant: Yes |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。