参数资料
| 型号： | LT3015EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO NEG ADJ 1.5A 8DFN |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 负，可调式 |
| 输出电压： | -1.22 V ~ -29.5 V |
| 输入电压： | -1.8 V ~ -30 V |
| 电压 - 压降（标准）： | 0.31V @ 1.5A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.5A |
| 电流 - 限制（最小）： | 1.7A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x3） |
| 包装： | 带卷 (TR) |
LT3015 Series
APPLICATIONS INFORMATION
Table 1 shows 1% resistor divider values for some com-
mon output voltages with a resistor divider current of
approximately 100μA.
to –1.22V output voltage performance regardless of the
chosen output voltage (see Transient Response and Output
Noise in the Typical Performance Characteristics section).
Table 1. Output Voltage Resistor Divider Values
V OUT R1
(V) (kΩ)
–2.5 12.1
–3.0 12.1
–3.3 12.1
–5.0 12.1
–12.0 12.1
R2
(kΩ)
12.7
17.8
20.5
37.4
107
It is important to note that the start-up time is affected by
the use of a feedforward capacitor. Start-up time is directly
proportional to the size of the feedforward capacitor and
the output voltage, and is inversely proportional to the
feedback resistor divider current. In particular, it slows
to 860μs with a 10nF feedforward capacitor and a 10μF
output capacitor for an output voltage set to –5V by a
100μA feedback resistor divider current.
–15.0
12.4
140
Feedforward Capacitance: Output Voltage Noise,
Transient Performance, and PSRR
C IN
GND
LT3015
R1
C OUT
The LT3015 regulators provide low output voltage noise
over the 10Hz to 100kHz bandwidth while operating at
full load current. Output voltage noise is approximately
240nV/√ Hz over this frequency while operating in unity-gain
configuration. For higher output voltages (using a resistor
divider), the output voltage noise gains up accordingly. To
lower the output voltage noise for higher output voltages,
include a feedforward capacitor (C FF ) from V OUT to V ADJ .
A good quality, low leakage, capacitor is recommended.
This capacitor bypasses the resistor divider network at high
frequencies; and hence, reduces the output noise. With
the use of a 10nF feedforward capacitor, the output noise
decreases from 220μV RMS to 70μV RMS when the output
voltage is set to –5V by a 100μA feedback resistor divider.
Higher values of output voltage noise are often measured
if care is not exercised with regard to circuit layout and
testing. Crosstalk from nearby traces induces unwanted
noise onto the LT3015’s output. Moreover, power supply
ripple rejection (PSRR) must also be considered, as the
LT3015 does not exhibit unlimited PSRR; and thus, a
small portion of the input noise propagates to the output.
Using a feedforward capacitor (C FF ) from V OUT to V ADJ has
the added benefit of improving transient response and PSRR
for output voltages greater than –1.22V. With no feedforward
capacitor, the response and settling times will increase as
the output voltage is raised above –1.22V. Use the equa-
tion in Figure 3 to determine the minimum value of C FF to
achieve a transient (and noise) performance that is similar
16
SHDN ADJ
V IN R2 C FF
IN OUT V OUT
3015 F03
C FF ≥ 10nF/100μA ? I FB-DIVIDER
I FB-DIVIDER = V OUT /(R1+R2)
Figure 3. Feedforward Capacitor for Fast Transient
Response, Low Noise, and High PSRR
Output Capacitance and Transient Performance
The LT3015 regulators are stable with a wide range of
output capacitors. The ESR of the output capacitor affects
stability, most notably with small capacitors. Use a mini-
mum output capacitor of 10μF with an ESR of 500mΩ or
less to prevent oscillations. The LT3015’s load transient
response is a function of output capacitance. Larger val-
ues of output capacitance decrease the peak deviations
and provide improved transient response for larger load
current changes.
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior across
temperature and applied voltage. The most common
dielectrics used are specified with EIA temperature char-
acteristic codes of Z5U, Y5V, X5R, and X7R. The Z5U and
Y5V dielectrics are good for providing high capacitances
in a small package, but they tend to have strong voltage
and temperature coefficients as shown in Figures 4 and 5.
3015fb
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相关代理商/技术参数 |
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| LT3015EMSE | 制造商:Linear Technology 功能描述:LDO NEG 1.5A 12MSOP 制造商:Linear Technology 功能描述:LDO, NEG, 1.5A, 12MSOP |
| LT3015EMSE#PBF | 功能描述:IC REG LDO NEG ADJ 1.5A 12MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:8V 输入电压:10.5 V ~ 23 V 电压 - 压降（标准）:1.7V @ 40mA 稳压器数量:1 电流 - 输出:100mA（最小值） 电流 - 限制（最小）:- 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:剪切带 (CT) 产品目录页面:1075 (CN2011-ZH PDF) 其它名称:296-24390-1 |
| LT3015EMSE#TRPBF | 功能描述:IC REG LDO NEG ADJ 1.5A 12MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
| LT3015EMSE-12#PBF | 功能描述:IC REG LDO -12V 1.5A 12-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
| LT3015EMSE-12#TRPBF | 功能描述:IC REG LDO -12V 1.5A 12-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
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