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参数资料
| 型号： | LTC1515CS8-3/5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 3V/5V 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： | 3V，5V |
| 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 |
LTC1515 Series
APPLICATIO N S I N FOR M ATIO N
(equivalent series resistance) in the output capacitor.
Typical output ripple (V IN < 8V) under maximum load is
100mV peak-to-peak with a low ESR, 10 μ F output capaci-
tor. For applications requiring V IN to exceed 8V, a 22 μ F or
larger C OUT capacitor is recommended to maintain maxi-
mum ripple in the 100mV range.
The magnitude of the ripple voltage depends on several
factors. High input voltages increase the output ripple
since more charge is delivered to C OUT per charging cycle.
A large C1 flying capacitor (> 0.22 μ F) also increases ripple
in step-up mode for the same reason. Large output
current load and/or a small output capacitor (<10 μ F)
results in higher ripple due to higher output voltage dV/dt.
High ESR capacitors (ESR > 0.5 ? ) on the 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 large 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 typi-
cally found with higher value (larger case size) capacitors.
A low ESR (<0.5 ? ) ceramic output capacitor will mini-
mize the high frequency ripple, but will not reduce the low
frequency ripple unless a high capacitance value is cho-
sen. 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 4).
LTC1515/
LTC1515-X
ing 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 the input supply.
Only the effective charge pump output impedance limits
the current while the charge pump is enabled. This may
disrupt input supply regulation, especially if the input
supply is a low power DC/DC converter or linear regulator.
The LTC1515 family minimizes inrush currents both at
start-up and under high V IN to V OUT operation.
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 cur-
rent 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.
Power-On Reset
The POR pin is an open-drain output that pulls low when
the output voltage is out of regulation. When the V OUT
rises to within 6.5% of regulation, an internal timer is
started which releases POR after 200ms (typ). In shut-
V OUT
8
+
15 μ F
1 μ F
V OUT
down, the POR output is pulled low. In normal operation,
an external pull-up resistor is generally used between the
LTC1515/
TANTALUM
CERAMIC
POR pin and V OUT .
LTC1515-X
+ +
8 2 ?
V OUT V OUT
10 μ F 10 μ F
TANTALUM TANTALUM
LT1515 ? F04
Figure 4. Output Ripple Reduction Techniques
Inrush Currents
A common problem with switched capacitor regulators is
inrush current—particularly during power-up and com-
Protection Features
All of the parts contain thermal shutdown and short-
circuit protection features. The parts will shut down when
the junction temperature reaches approximately 150 ° C
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 an
indefinite short to GND.
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
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| LTC1515IS8 | 功能描述:IC REG MULTI CONFIG ADJ 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 |
| LTC1515IS8#PBF | 功能描述:IC REG MULTI CONFIG ADJ 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC1515IS8#TR | 功能描述:IC REG MULTI CONFIG ADJ 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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