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參數(shù)資料
| 型號： | LTC1682IS8-3.3 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Replaced by TLV5618A : Dual 12-Bit DAC, Pgrmable 8-SOIC |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 620 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 186K |
| 代理商： | LTC1682IS8-3.3 |
8
LTC1682/LTC1682-3.3/LTC1682-5
Operation
The LTC1682 uses a switched-capacitor charge pump to
generate a CPO voltage of approximately 2(V
IN
). CPO
powers an internal low dropout linear regulator that sup-
plies a regulated output at V
OUT
. Internal comparators are
used to sense CPO and V
IN
voltages for power-up condi-
tioning. The output current is sensed to determine the
charge pump operating mode. A trimmed internal bandgap
is used as the voltage reference and a trimmed internal
oscillator is used to control the charge pump switches.
The charge pump is a doubler configuration that uses one
external flying capacitor. When enabled, a 2-phase
nonoverlapping clock controls the charge pump switches.
At start-up, the LDO is disabled and the load is removed
from CPO. When CPO reaches 1.75(V
IN
) the LDO is
enabled. If CPO falls below 1.45(V
IN
) the LDO will be
disabled. Generally, the charge pump runs open loop with
continuous clocking for low noise. If CPO is greater than
1.95(V
IN
) and I
OUT
is less than 100
μ
A, the charge pump
will operate in Burst Mode operation for increased effi-
ciency but slightly higher output noise. In Burst Mode
operation, the clock is disabled when CPO reaches 1.95(V
IN
)
and enabled when CPO droops by about 100mV. The
switching frequency is precisely controlled to ensure that
the frequency is above 455kHz and at the optimum rate to
ensure maximum efficiency. The switch edge rates are
also controlled to minimize noise. The effective output
resistance at CPO is dependent on the voltage at V
IN
, CPO
and the junction temperature. A low ESR capacitor of
≥
2
μ
F
should be used at CPO for minimum noise.
The LDO is used to filter the ripple on CPO and to set an
output voltage independent of CPO. V
OUT
is set by an
external or internal resistor divider. The LDO requires a
capacitor on V
OUT
for stability and improved load transient
response. A low ESR capacitor of
≥
2
μ
F should be used.
Output Voltage Selection
The LTC1682-3.3/LTC1682-5 versions have internal
resistor networks to set the regulated output voltage. The
LTC1682 output voltage is set using an external resistor
divider (see Figure 3). The output voltage is determined
using the following formula:
V
OUT
= 1.235V(1 + R1/R2)
The output voltage range is 2.5V to 5.5V.
Maximum V
OUT
and I
OUT
Calculations
The maximum available output voltage and current can be
calculated based on the open circuit CPO voltage, the
dropout voltage of the LDO and the effective output
resistance of the charge pump. The open circuit CPO
voltage is approximately 2(V
IN
) (see Figure 4).
Figure 3. Powering an Auxiliary Regulator from CPO
APPLICATIO
S I
N
FOR
ATIO
U
W
U
R1
56k
R2
18k
C1
0.22
μ
F
C4
4.7
μ
F
1682 F03
V
IN
3.6V
C3
4.7
μ
F
5.1V
V
RIPPLE
= 800
μ
V
P-P
1
2
3
4
8
7
6
5
V
OUT
SHDN
FB
GND
CPO
C
+
V
IN
C
–
LTC1682
C2
4.7
μ
F
IN
3.3V
OUT
GND
C5
EXTERNAL LDO
V
OUT
= 1.235V(1 + R1/R2)
+
2V
IN
R
CPO
C
CPO
V
CPO
V
OUT
I
LOAD
1682 F04
R
DROPOUT
+
V
DROPOUT
–
Figure 4. Equivalent Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1682IS8-5 | Doubler Charge Pumps with Low Noise Linear Regulator |
| LTC1682 | Doubler Charge Pumps with Low Noise Linear Regulator(可調(diào)輸出，帶低噪聲線性穩(wěn)壓器的倍壓器電荷泵) |
| LTC1682-5 | Doubler Charge Pumps with Low Noise Linear Regulator(5V輸出，帶低噪聲線性穩(wěn)壓器的倍壓器電荷泵) |
| LTC1685 | 52Mbps, Precision Delay, RS485 Fail-Safe Transceiver |
| LTC1685CS8 | 52Mbps, Precision Delay, RS485 Fail-Safe Transceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1682IS8-5 | 功能描述:IC REG MULTI CONFIG 5V 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1682IS8-5#PBF | 功能描述:IC REG MULTI CONFIG 5V 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC1682IS8-5#TR | 功能描述:IC REG MULTI CONFIG 5V 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1682IS8-5#TRPBF | 功能描述:IC REG MULTI CONFIG 5V 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1685CS8 | 功能描述:IC TXRX RS485 PREC DELAY 8-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
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