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参数资料
| 型号： | LT3436EFE |
| 厂商： | Linear Technology |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 3A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 34 V |
| 输入电压： | 3 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 800kHz |
| 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： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
LT3436
APPLICATIO N S I N FOR M ATIO N
FB RESISTOR NETWORK
The suggested resistance (R2) from FB to ground is 10k
1%. This reduces the contribution of FB input bias current
to output voltage to less than 0.2%. The formula for the
resistor (R1) from V OUT to FB is:
to 22 μ F range. Since the absolute value of capacitance
defines the pole frequency of the output stage, an X7R or
X5R type ceramic, which have good temperature stability,
is recommended.
Tantalum capacitors are usually chosen for their bulk
R 1 =
R2 ( V OUT ? 1. 2 )
1 . 2 ? R 2 ( 0 . 2 μ A )
capacitance properties, useful in high transient load appli-
cations. ESR rather than absolute value defines output
ripple at 800kHz. Values in the 22 μ F to 100 μ F range are
generally needed to minimize ESR and meet ripple current
ratings. Care should be taken to ensure the ripple ratings
are not exceeded.
LT3436
ERROR
AMPLIFIER
+
1.2V
V SW
OUTPUT
Table 1. Surface Mount Solid Tantalum Capacitor ESR and
Ripple Current
E Case Size ESR (Max, ? ) Ripple Current (A)
–
FB
R1
+
R2
AVX TPS, Sprague 593D
D Case Size
AVX TPS, Sprague 593D
0.1 to 0.3
0.1 to 0.3
0.7 to 1.1
0.7 to 1.1
10k
C Case Size
V C
GND
3436 F02
AVX TPS
0.2 (typ)
0.5 (typ)
0 . 29 ( V IN ) ( V OUT ? V IN )
( L )( f )( V OUT )
Figure 2. Feedback Network
OUTPUT CAPACITOR
Step-up regulators supply current to the output in pulses.
The rise and fall times of these pulses are very fast. The
output capacitor is required to reduce the voltage ripple
this causes. The RMS ripple current can be calculated
from:
I RIPPLE ( RMS ) = I OUT ( V OUT ? V IN ) / V IN
The LT3436 will operate with both ceramic and tantalum
output capacitors. Ceramic capacitors are generally cho-
sen for their small size, very low ESR (effective series
resistance), and good high frequency operation, reducing
output ripple voltage. Their low ESR removes a useful zero
in the loop frequency response, common to tantalum
capacitors. To compensate for this, the V C loop compen-
sation pole frequency must typically be reduced by a factor
of 10. Typical ceramic output capacitors are in the 4.7 μ F
INPUT CAPACITOR
Unlike the output capacitor, RMS ripple current in the
inputcapacitorisnormallylowenoughthatripplecurrent
rating is not an issue. The current waveform is triangular,
with an RMS value given by:
I RIPPLE ( RMS ) =
At higher switching frequency, the energy storage require-
ment of the input capacitor is reduced so values in the
range of 2.2 μ F to 10 μ F are suitable for most applications.
Y5V or similar type ceramics can be used since the
absolute value of capacitance is less important and has no
significant effect on loop stability. If operation is required
close to the minimum input voltage required by either the
output or the LT3436, a larger value may be necessary.
This is to prevent excessive ripple causing dips below the
minimum operating voltage resulting in erratic operation.
3436fa
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3436EFE#PBF | 功能描述:IC REG BOOST ADJ 3A 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 |
| LT3436EFE#TR | 功能描述:IC REG BOOST ADJ 3A 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 |
| LT3436EFE#TRPBF | 功能描述:IC REG BOOST ADJ 3A 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: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 |
| LT3436EFEPBF | 制造商:Linear Technology 功能描述:LT3436 adj 3A SU boost dc-dc converter |
| LT3437 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage 500mA, 200kHz Step-Down Switching Regulator with 100μA Quiescent Current |
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