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參數(shù)資料
| 型號： | LT3060EDC#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | FIXED POSITIVE LDO REGULATOR, PDSO8 |
| 封裝： | 2 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, DFN-8 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 277K |
| 代理商： | LT3060EDC#PBF |
LT3060
12
3060f
Bypass Capacitance, Output Voltage Noise and
Transient Response
The LT3060 regulator provides low output voltage noise
over the 10Hz to 100kHz bandwidth while operating at
full load with the addition of a reference bypass capacitor
(CREF/BYP) from the REF/BYP pin to GND. A good quality,
low leakage capacitor is recommended. This capacitor will
bypass the internal reference of the regulator, providing a
low frequency noise pole. With the use of 10nF for CREF/BYP,
the output voltage noise decreases to as low as 30μVRMS
when the output voltage is set for 0.6V. For higher output
voltages (generated by using a feedback resistor divider),
the output voltage noise gains up accordingly when using
CREF/BYP by itself.
To lower the output voltage noise for higher output voltages,
include a feedforward capacitor (CFF) from VOUT to the ADJ
pin. A good quality, low leakage capacitor is recommended.
This capacitor will bypass the error amplier of the regulator,
providing a low frequency noise pole. With the use of 10nF
for both CFF and CREF/BYP, output voltage noise decreases
to 30μVRMS when the output voltage is set to 5V by a 5μA
feedback resistor divider. If the current in the feedback
resistor divider is doubled, CFF must also be doubled to
achieve equivalent noise performance.
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 LT3060’s output. Power supply ripple
rejection must also be considered. The LT3060 regulator
does not have unlimited power supply rejection and passes
a small portion of the input noise through to the output.
Using a feedforward capacitor (CFF) from VOUT to the ADJ
pin has the added benet of improving transient response
for output voltages greater than 0.6V. With no feedforward
capacitor, the settling time will increase as the output
voltage is raised above 0.6V. Use the equation in Figure 2
to determine the minimum value of CFF to achieve a
transient response that is similar to 0.6V output voltage
performance regardless of the chosen output voltage
(See Figure 3 and Transient Response in the Typical Perf-
ormance Characteristics section).
During start-up, the internal reference will soft-start if a
reference bypass capacitor is present. Regulator start-
up time is directly proportional to the size of the bypass
capacitor, slowing to 6ms with a 10nF bypass capacitor
(See Start-up Time vs REF/BYP Capacitor in the Typical
Performance Characteristics section). The reference
bypass capacitor is actively drained during shutdown to
reset the internal reference soft-start.
Figure 2. Feedforward Capacitor for Fast Transient Response
Figure 3. Transient Response vs Feedforward Capacitor
APPLICATIONS INFORMATION
3060 F02
IN
SHDN
OUT
ADJ
GND REF/BYP
LT3060
VIN
VOUT
CREF/BYP
CFF
COUT
R2
R1
100μs/DIV
VOUT = 5V
COUT = 10μF
IFB-DIVIDER = 5μA
0
1nF
10nF
LOAD CURRENT
100mA/DIV
FEEDFOR
W
ARD
CAP
ACITOR,
C
FF
100pF
3060 F03
V
OUT
50mV
/DIV
Start-uptimeisalsoaffectedbythepresenceofafeedforward
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,slowingto15mswitha4.7nFfeedforwardcapacitor
and a 10μF output capacitor for an output voltage set to
5V by a 5μA feedback resistor divider.
Output Capacitance
The LT3060 regulator is stable with a wide range of output
capacitors. The ESR of the output capacitor affects stability,
most notably with small capacitors. Use a minimum output
capacitor of 2.2μF with an ESR of 3Ω or less to prevent
oscillations. If a feedforward capacitor is used with output
C
nF
μA
I
V
R
FF
FB DIVIDER
OUT
≥
()
=
47
5
.
1
12
+R
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|---|---|
| LT3060EDCTR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator |
| LT3060EDCTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator |
| LT3060ETS8 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator |
| LT3060ETS8#PBF | 制造商:Linear Technology 功能描述:IC ADJ LDO REG 0.6V TO 44.5V 0.1A TSOT-8; Primary Input Voltage:45V; Dropout Voltage Vdo:300mV; No. of Pins:8; Output Current:100mA; Operating Temperature Min:-40C; Operating Temperature Max:125C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes |
| LT3060ETS8#TRMPBF | 功能描述:IC REG LDO ADJ .1A 8TSOT RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓模塊:MIC5365/66 Ultra-small LDO Regulators 標準包裝:1 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:3V 輸入電壓:最高 5.5V 電壓 - 壓降（標準）:0.155V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最小）:200mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:4-UDFN 裸露焊盤，4-TMLF? 供應(yīng)商設(shè)備封裝:4-TMLF?（1x1） 包裝:Digi-Reel® 其它名稱:576-3192-6 |
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