- 您现在的位置：买卖IC网 > PDF目录14075 > LT1961IMS8E#PBF (Linear Technology)IC REG BOOST ADJ 1.5A 8MSOP PDF资料下载
参数资料
| 型号： | LT1961IMS8E#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1.5A 8MSOP |
| 标准包装： | 50 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 35 V |
| 输入电压： | 3 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.25MHz |
| 电流 - 输出： | 1.5A |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-MSOP-EP |
LT1961
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:
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
capacitance properties, useful in high transient load appli-
R 1 =
R 2 ( V OUT ? 1 . 2 )
1 . 2 ? R 2 ( 0 . 2 μ A )
cations. ESR rather than absolute value defines output
ripple at 1.25MHz. 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.
Table 1. Surface Mount Solid Tantalum Capacitor ESR and
LT1961
ERROR
V SW
OUTPUT
Ripple Current
E Case Size ESR (Max, Ω ) Ripple Current (A)
AMPLIFIER
+
1.2V
AVX TPS, Sprague 593D
0.1 to 0.3
0.7 to 1.1
–
FB
R1
+
R2
AVX TAJ
D Case Size
AVX TPS, Sprague 593D
0.7 to 0.9
0.1 to 0.3
0.4
0.7 to 1.1
10k
C Case Size
V C
GND
1961 F02
AVX TPS
0.2 (typ)
0.5 (typ)
0 . 29 ( V IN ) ( OUT ? V IN )
I RIPPLE ( RMS ) =
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 LT1961 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 1 μ F to
10 μ F range. Since the absolute value of capacitance
INPUT CAPACITOR
Unlike the output capacitor, RMS ripple current in the
input capacitor is normally low enough that ripple current
rating is not an issue. The current waveform is triangular,
with an RMS value given by:
V
( L )( f )( V OUT )
At higher switching frequency, the energy storage require-
ment of the input capacitor is reduced so values in the
range of 1 μ F to 4.7 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 LT1961, a larger value may be necessary.
This is to prevent excessive ripple causing dips below the
minimum operating voltage resulting in erratic operation.
1961fa
7
相关PDF资料 |
PDF描述 |
|---|---|
| HM71-30331LFTR | HIGH PERF LOW COST INDUCTORS |
| MAX6869UK20D3S+T | IC MPU SUPERVISOR SOT23-5 |
| LTC3532EMS#TRPBF | IC REG BUCK BST SYNC 0.5A 10MSOP |
| HM71-30221LFTR | HIGH PERF LOW COST INDUCTORS |
| MAX6869UK20D4L+T | IC MPU SUPERVISOR SOT23-5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1961IMS8ETR | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A, 1.25MHz Step-Up Switching Regulator |
| LT1961IMS8ETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A, 1.25MHz Step-Up Switching Regulator |
| LT1962 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower Low Dropout Regulators with Shutdown |
| LT1962EMS8 | 功能描述:IC REG LDO ADJ .3A 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:More Information on LDOs 标准包装:50 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 15V 电压 - 压降（标准）:1.1V @ 800mA 稳压器数量:1 电流 - 输出:800mA 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-4，D²Pak（3 引线+接片），TO-263AA 供应商设备封装:D2PAK-3 包装:管件 |
| LT1962EMS8#PBF | 功能描述:IC REG LDO ADJ .3A 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:MIC5365/66 Ultra-small LDO Regulators 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:最高 5.5V 电压 - 压降（标准）:0.155V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:200mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:4-UDFN 裸露焊盘，4-TMLF? 供应商设备封装:4-TMLF?（1x1） 包装:Digi-Reel® 其它名称:576-3192-6 |
发布紧急采购，3分钟左右您将得到回复。