- 您现在的位置：买卖IC网 > PDF目录14042 > LTC3619BIMSE#PBF (Linear Technology)IC REG BUCK SYNC ADJ DL 10MSOP PDF资料下载
参数资料
| 型号： | LTC3619BIMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 10MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 400mA，800mA |
| 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： | 管件 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
LTC3619B
APPLICATIONS INFORMATION
R2 = ? OUT ? 1 ? ? R1 = 118k
DesignExample
As a design example, consider using the LTC3619B in a
USB-GSM application, with V IN = 5V, I INMAX = 500mA, with
the output of channel 2 charging a SuperCap of 4.4mF.
The load on each channel requires a maximum of 400mA
and 800mA in active mode and 2mA in standby mode.
The output voltages are V OUT1 = 1.8V and V OUT2 = 3.4V.
Start with channel 1. First, calculate the inductor value
for about 40% ripple current (160mA in this example) at
maximum V IN . Using a derivation of Equation 1:
0.6V feedback voltage makes R1~60k. A close standard
1% resistor is 59k. Using Equation 2.
? V ?
? 0.6 ?
An optional 22pF feedback capacitor (C F1 ) may be used
to improve transient response.
Using the same analysis for channel 2 (V OUT2 = 3.4V),
the results are:
L2 = 1.5μH
? ? 1 ?
? = 3.2μH
L1 =
1.8V
2.25MHz ? (160mA)
?
?
1.8V ?
5V ?
R3 = 59k
R4 = 276k
For the inductor, use the closest standard value of 3.3μH.
A 10μF ceramic capacitor should be more than sufficient
for this output capacitor. As for the input capacitor, a
typical value of C IN = 10μF should suffice, if the source
impedance is very low.
The feedback resistors program the output voltage. To
maintain high efficiency at light loads, the current in these
resistors should be kept small. Choosing 10μA with the
A feed forward capacitor is not used on channel 2 since
the 4.4mF SuperCap will inhibit any fast output voltage
transients. Figure 4 shows the complete schematic for
this example, along with the efficiency curve and transient
response. Input current limit is set at 475mA average cur-
rent, R LIM = 116k, C LIM = 2200pF. See Programming Input
Current Limit section for selecting R LIM and Selection of
C LIM Capacitance section for C LIM .
V IN
USB INPUT 5V
C IN
10μF
RUN2 V IN RUN1
V OUT2
3.4V AT
800mA
L2
1.5μH
PGOOD2 PGOOD1
LTC3619B
SW2 SW1
L1
3.3μH
C F1 , 22pF
V OUT1
1.8V AT
400mA
+
R4
276k
C OUT2
2.2mF
× 2
SuperCap
R3
59k
V FB2
RLIM
R LIM
116k
V FB1
GND
C LIM
2200pF
R1 R2
59k 118k
C OUT1
10μF
3619B F04a
I LIM = 475mA
C IN , C OUT1 : AVX 08056D106KAT2A
C OUT2 : VISHAY 592D228X96R3X2T20H
L1: COILCRAFT LPS4012-332ML
L2: COILCRAFT LPS4012-152ML
Figure 4a. Design Example Circuit
3619bfb
16
相关PDF资料 |
PDF描述 |
|---|---|
| V24B24E200B2 | CONVERTER MOD DC/DC 24V 200W |
| LTC3619BIDD#PBF | IC REG BUCK SYNC ADJ DL 10DFN |
| LT3990EMSE-5#TRPBF | IC REG BUCK ADJ 0.35A 16MSOP |
| LT3990EMSE-3.3#TRPBF | IC REG BUCK ADJ 0.35A 16MSOP |
| V24B24E200B | CONVERTER MOD DC/DC 24V 200W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3619EDD#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LTC3619EDD#PBF | 制造商:Linear Technology 功能描述:IC SYNC STEP-DOWN DC/DC CONVERTER DFN-10 |
| LTC3619EDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ DL 10DFN 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3619EMSE#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 10MSOP 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3619EMSE#PBF | 制造商:Linear Technology 功能描述:IC SYNC STEP-DOWN DC/DC CONVERTER MSOP10 |
发布紧急采购，3分钟左右您将得到回复。