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参数资料
| 型号： | LT3469ETS8#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC AMP DVR W/REG 1.3MHZ TSOT23-8 |
| 标准包装： | 500 |
| 类型： | AB 类 |
| 输出类型： | 1-通道（单声道） |
| 电源电压： | 2.5 V ~ 16 V |
| 特点： | 差分输入 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | TSOT-23-8 |
| 封装/外壳： | SOT-23-8 薄型，TSOT-23-8 |
| 包装： | 带卷 (TR) |
| 其它名称： | LT3469ETS8#PBF LT3469ETS8#PBF-ND |
LT3469
7
3469f
as short as possible. To prevent electromagnetic interfer-
ence (EMI) problems, proper layout of the high frequency
switching path is essential. The voltage signal of the SW
pin has sharp rise and fall edges. The SW pin should be
surrounded on three sides by metal connected to VCC to
shield +IN and –IN. Minimize the area of all traces con-
nected to the SW pin and always use a ground plane under
the switching regulator to minimize interplane coupling. In
addition, the ground connection for the feedback resistor
R1 should be tied directly to the GND pin and not shared
with any other component, ensuring a clean, noise-free
connection. The ground return of the piezoceramic
microactuator should also have a direct and unshared
connection to the GND pin. The GND connection to R5
should be tied directly to the ground of the source gener-
ating the INPUT signal to avoid error induced by voltage
drops along the GND line. Recommended component
placement is shown in Figure 6.
Thermal Considerations and Power Dissipation
The LT3469 combines large output drive with a small
package. Because of the high supply voltage capability, it
is possible to operate the part under conditions that
exceed the maximum junction temperature. Maximum
junction temperature (TJ) is calculated from the ambient
temperature (TA) and power dissipation (PD) as follows:
TJ = TA + (PD 250°C/W)
Worst-case power dissipation occurs at maximum output
swing, frequency, capacitance and VCC. For a square wave
input, power dissipation is calculated from the amplifier
quiescent current (IQ), input frequency (f), output swing
(VOUT(P-P)), capacitive load (CL), amplifier supply voltage
(VCC) and switching regulator efficiency (η) as follows:
P
IfV
C
V
D
QL
CC
=
+
()()
OUT(P-P)
η
Example: LT3469 at TA = 70°C, VCC = 35V, CL = 200nF,
f = 3kHz, VOUT(P-P) = 4V, η = 80%:
P
mA
kHz
V
nF
V
mW
T
C
mW
C W
C
D
J
=
+
()( )
=
=° +
°
() =°
2 5
3
4
200
35
080
214
70
214
250
124
.
.
/
Do not exceed the maximum junction temperature of
125
°C.
Figure 6. Recommended Component Placement
R4
INPUT
R5
R1
R3
R2
C1
C2
VIN
VIAS TO GROUND PLANE
PIEZ0
ACTUATOR
GND
L
3469 F06
OPERATIO
U
Piezo Speaker Driver
+
–
+IN
35
6
2
4
1
8
7
GND
FB
VCC
SW
LT3469
VIN
294k
17.4k
C2
0.47
F
35V
VOUT
1V TO 20V
C1, C2: X5R OR X7R DIELECTRIC
L1: MURATA LQH32CN470
SOUND PRESSURE LEVEL: 87dB AT 750Hz/10VP-P/10cm
WITH A 55nF PIEZO SPEAKER. IVIN WITH VIN = 3.3V:
24mA AT 750Hz/10VP-P WITH A 55nF PIEZO SPEAKER
PIEZO
SPEAKER
8nF < C < 300nF
20k
+
–
16.9k
113k
L1
47
H
–IN
OUT
3469 TA01
VIN
3V TO 6V
INPUT
0V TO 3V
C1
1
F
U
TYPICAL APPLICATIO
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.
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相关代理商/技术参数 |
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|---|---|
| LT3470 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Micropower Buck Regulator with Integrated Boost and Catch Diodes |
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| LT3470AEDDB#TRMPBF | 功能描述:IC REG BUCK ADJ 0.25A 8DFN 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 |
| LT3470AEDDB#TRPBF | 功能描述:IC REG BUCK ADJ 0.25A 8DFN 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 |
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