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| 型号： | LTC1514CS8-3.3 |
| 厂商： | Linear Technology |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 3.3V 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压），升压（升压），切换电容（充电泵） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 2 V ~ 10 V |
| 频率 - 开关： | 650kHz |
| 电流 - 输出： | 50mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
LTC1514-3.3/LTC1514-5
APPLICATIO N S I N FOR M ATIO N
output pin cause high frequency voltage spikes on V OUT
with every clock cycle.
There are several ways to reduce the output voltage
ripple. A larger C OUT capacitor (22 μ F or greater) will
reduce both the low and high frequency ripple due to the
lower C OUT charging and discharging dV/dt and the lower
ESR typically found with higher value (larger case size)
capacitors. A low ESR ceramic output capacitor will
minimize the high frequency ripple, but will not reduce
the low frequency ripple unless a high capacitance value
is chosen. A reasonable compromise is to use a 10 μ F to
22 μ F tantalum capacitor in parallel with a 1 μ F to 3.3 μ F
ceramic capacitor on V OUT to reduce both the low and
high frequency ripple. An RC or LC filter may also be used
to reduce high frequency voltage spikes (see Figure 1).
Internal soft start circuitry controls the rate at which V OUT
may be charged from 0V to its final regulated value. The
typical start-up time from V OUT = 0V to 5V is 4ms. This
corresponds to an effective V OUT charging current of only
12.5mA for a 10 μ F output capacitor (27.5mA for 22 μ F,
etc). Note that any output current load present during
start-up will add directly to the charging currents men-
tioned above. The soft start circuitry limits start-up
current both at initial power-up and when coming out of
shutdown.
As the V IN (or boosted V IN ) to V OUT voltage differential
grows, the effective output impedance of the charge
pump is automatically increased by internal voltage
sensing circuitry. This feature minimizes the current
spikes pulled from V IN whenever the charge pump is
enabled and helps to reduce both input and output ripple.
V OUT
LTC1514-X
8
+
15 μ F
TANTALUM
1 μ F
CERAMIC
V OUT
Protection Features
The LTC1514-X contain thermal shutdown and short-
circuit protection features. The parts will shut down when
the junction temperature reaches approximately 150 ° C
V OUT
LTC1514-X
8
+
2 ?
10 μ F
TANTALUM
+
V OUT
10 μ F
TANTALUM
and will resume operation once the junction temperature
has dropped back to approximately 140 ° C. The parts will
limit output current to 12mA (typ) when a short-circuit
condition (V OUT < 100mV) exists. The parts can survive
1514 F01
Figure 1. Output Ripple Reduction Techniques
Inrush Currents
A common problem with switched capacitor regulators
is inrush current — particularly during power-up and
coming out of shutdown mode. Whenever large V IN (or
boosted V IN ) to V OUT voltage differentials are present,
most charge pumps will pull large current spikes from
an indefinite short to GND. The LTC1514-X devices use
a low thermal resistance SO-8 package (110 ° C/W vs
150 ° C/W for standard SO-8). This permits full output
current, even at high input supply voltages.
Low-Battery Comparator
The internal low-battery comparator trips at 1.145 ± 3%
(LBI ramping negative). Programming the comparator to
trip at a higher voltage can easily be done with an external
the input supply. Only the effective charge pump output
impedance limits the current while the charge pump is
V BAT
1
LTC1514-X
SHDN V OUT
8
enabled. This may disrupt input supply regulation, espe-
cially if the input supply is a low power DC/DC converter
or linear regulator. The LTC1514-3.3/LTC1514-5 mini-
R1
R2
2
3
4
LBO
LBI
GND
V IN
C1 +
C1 –
7
6
5
V TRIP = 1.145V(1 + R1/R2)
(LBI RAMPING NEGATIVE)
mize inrush currents both at start-up and under normal
1514 F02
high V IN to V OUT operation.
Figure 2. Programming the Low-Battery Comparator Trip Voltage
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1514CS8-5 | 功能描述:IC REG MULTI CONFIG 5V 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1514CS8-5#PBF | 功能描述:IC REG MULTI CONFIG 5V 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LTC1514CS8-5#TR | 功能描述:IC REG MULTI CONFIG 5V 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1514CS8-5#TRPBF | 功能描述:IC REG MULTI CONFIG 5V 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1514IS8-3.3 | 功能描述:IC REG MULTI CONFIG 3.3V 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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