参数资料
| 型号： | LT3431IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 48 V |
| 输入电压： | 5.5 V ~ 60 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
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LT3431
APPLICATIO S I FOR ATIO
reduced. This type of subharmonic switching only occurs
at input voltages less than twice output voltage. Higher
inductor values will tend to eliminate this problem. See
Frequency Compensation section for a discussion of an
entirely different cause of subharmonic switching before
assuming that the cause is insufficient slope compensa-
tion. Application Note 19 has more details on the theory
of slope compensation.
At power-up, when V C is being clamped by the FB pin (see
Figure 2, Q2), the sync function is disabled. This allows the
frequency foldback to operate in the shorted output con-
dition. During normal operation, switching frequency is
controlled by the internal oscillator until the FB pin reaches
nanosecond range. To prevent noise both radiated and
conducted, the high speed switching current path, shown
in Figure 5, must be kept as short as possible. This is imple-
mented in the suggested layout of Figure 6. Shortening
this path will also reduce the parasitic trace inductance of
approximately 25nH/inch. At switch off, this parasitic in-
ductance produces a flyback spike across the LT3431
switch. When operating at higher currents and input volt-
ages, with poor layout, this spike can generate voltages
across the LT3431 that may exceed its absolute maximum
rating. A ground plane should always be used under the
switcher circuitry to prevent interplane coupling and over-
all noise.
0.6V, after which the SYNC pin becomes operational. If no
LT3431
L1
synchronization is required, this pin should be connected
to ground.
HIGH
5V
V IN
C3
FREQUENCY
CIRCULATING
D1
C1
LOAD
LAYOUT CONSIDERATIONS
As with all high frequency switchers, when considering
layout, care must be taken in order to achieve optimal elec-
trical, thermal and noise performance. For maximum
efficiency, switch rise and fall times are typically in the
1 GND
2 SW
3 V IN
PATH
Figure 5. High Speed Switching Path
CONNECT TO
GROUND PLANE
3431 F05
4 V IN
5 SW
LT3431
GND
6 BOOST
L1
SOLDER THE EXPOSED PAD
V IN PINS 3 AND 4
ARE SHORTED TOGETHER.
SW PINS 2 AND 5 ARE ALSO
SHORTED TOGETHER (USING
AVAILABLE SPACE UNDERNEATH
MINIMIZE LT3430
C3-D1 LOOP
GND
D1
C2
D2
C1
V OUT
TO THE ENTIRE COPPER
GROUND PLANE UNDERNEATH
THE DEVICE. NOTE: THE BOOST
AND BIAS COPPER TRACES ARE
ON A SEPARATE LAYER FROM
THE GROUND PLANE
THE DEVICE BETWEEN PINS AND
GND PLANE)
1 GND
2 SW
GND 16
15
SHDN
KELVIN SENSE
V OUT
3 V IN
14
C3
4 V IN
5 SW
LT3431
13
FB 12
SYNC
CFB
R1
6 BOOST
V C 11
R2
KEEP FB AND V C COMPONENTS
AWAY FROM HIGH FREQUENCY,
V IN
7
8 GND
BIAS 10
GND 9
C F
C C
R C
HIGH CURRENT COMPONENTS
PLACE FEEDTHROUGH AROUND
GROUND PINS (4 CORNERS) FOR
GOOD THERMAL CONDUCTIVITY
3431 F06
Figure 6. Suggested Layout
sn3431 3431fs
17
相关PDF资料 |
PDF描述 |
|---|---|
| LT3433IFE#TRPBF | IC REG BUCK BST ADJ 0.5A 16TSSOP |
| LT3434IFE#TRPBF | IC REG BUCK ADJ 3A 16TSSOP |
| LT3435IFE#TRPBF | IC REG BUCK ADJ 3A 16TSSOP |
| LT3436EFE#TRPBF | IC REG BOOST ADJ 3A 16TSSOP |
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相关代理商/技术参数 |
参数描述 |
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| LT3433 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Step-Up/Step-Down DC/DC Converter |
| LT3433_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Step-Up/Step-Down DC/DC Converter |
| LT3433EFE | 功能描述:IC REG BUCK BST ADJ 0.5A 16TSSOP 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 |
| LT3433EFE#PBF | 功能描述:IC REG BUCK BST ADJ 0.5A 16TSSOP 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 |
| LT3433EFE#TR | 功能描述:IC REG BUCK BST ADJ 0.5A 16TSSOP 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 |
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