- 您现在的位置：买卖IC网 > PDF目录1829 > LTC3441EDE#TRPBF (Linear Technology)IC REG BUCK BOOST SYNC ADJ 12DFN PDF资料下载
参数资料
| 型号： | LTC3441EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 12DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.4 V ~ 5.25 V |
| 输入电压： | 2.4 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1.2A |
| 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： | 12-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 12-DFN（4x3） |
LTC3441
APPLICATIO S I FOR ATIO
Input Capacitor Selection
Since the V IN pin is the supply voltage for the IC it is
recommended to place at least a 4.7 μ F, low ESR bypass
capacitor.
input voltages, V IN bypassing becomes more critical;
therefore, a ceramic bypass capacitor as close to the V IN
and GND pins as possible is also required.
Operating Frequency Selection
Table 2. Capacitor Vendor Information
SUPPLIER PHONE FAX
AVX (803) 448-9411 (803) 448-1943
Sanyo (619) 661-6322 (619) 661-1055
WEB SITE
www.avxcorp.com
www.sanyovideo.com
Additional quiescent current due to the output switches
GATE charge is given by:
Buck: 800e –12 ? V IN ? f
Taiyo Yuden (408) 573-4150
(408) 573-4159
www.t-yuden.com
Boost: 400e –12 ? (V IN + V OUT ) ? f
Optional Schottky Diodes
The Schottky diodes across the synchronous switches B
and D are not required (V OUT < 4.3V), but provide a lower
drop during the break-before-make time (typically 15ns)
of the NMOS to PMOS transition, improving efficiency.
Use a Schottky diode such as an MBRM120T3 or equiva-
lent. Do not use ordinary rectifier diodes, since the slow
recovery times will compromise efficiency. For applica-
tions with an output voltage above 4.3V, a Schottky diode
Buck/Boost: f ? (1200e –12 ? V IN + 400e –12 ? V OUT )
where f = switching frequency
Closing the Feedback Loop
The LTC3441 incorporates voltage mode PWM control.
The control to output gain varies with operation region
(Buck, Boost, Buck/Boost), but is usually no greater than
15. The output filter exhibits a double pole response is
given by:
is required from SW2 to V OUT .
Output Voltage < 2.4V
f FILTER _ POLE =
1
2 ? π ? L ? C OUT
Hz
The LTC3441 can operate as a buck converter with output
voltages as low as 0.4V. The part is specified at 2.4V
where C OUT is the output filter capacitor.
The output filter zero is given by:
minimum to allow operation without the requirement of a
Schottky diode. Synchronous switch D is powered from
V OUT and the R DS(ON) will increase at low output voltages,
f FILTER _ ZERO =
1
2 ? π ? R ESR ? C OUT
Hz
therefore a Schottky diode is required from SW2 to V OUT
to provide the conduction path to the output.
Output Voltage > 4.3V
where R ESR is the capacitor equivalent series resistance.
A troublesome feature in Boost mode is the right-half
plane zero (RHP), and is given by:
A Schottky diode from SW to V OUT is required for output
voltages over 4.3V. The diode must be located as close to
the pins as possible in order to reduce the peak voltage on
f RHPZ
=
2
V IN
2 ? π ? I OUT ? L ? V OUT
Hz
SW2 due to the parasitic lead and trace inductance.
Input Voltage > 4.5V
For applications with input voltages above 4.5V which
could exhibit an overload or short-circuit condition, a
2 Ω /1nF series snubber is required between the SW1 pin
and GND. A Schottky diode from SW1 to V IN should also
be added as close to the pins as possible. For the higher
The loop gain is typically rolled off before the RHP zero
frequency.
A simple Type I compensation network can be incorpo-
rated to stabilize the loop but at a cost of reduced band-
width and slower transient response. To ensure proper
phase margin, the loop requires to be crossed over a
decade before the LC double pole.
3441fa
11
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3442EDE#TRPBF | IC REG BUCK BOOST SYNC ADJ 12DFN |
| LTC3443EDE#TRPBF | IC REG BUCK BOOST SYNC ADJ 12DFN |
| LTC3444EDD#TRPBF | IC DC/DC CONV WCDMA 8-DFN |
| LTC3447EDD#TRPBF | IC REG BUCK SYNC ADJ 0.6A 10DFN |
| LTC3448EMS8E#TRPBF | IC REG BUCK SYNC ADJ 0.6A 8MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3442 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation |
| LTC3442EDE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2.4V to 5.5V 12-Pin DFN EP |
| LTC3442EDE#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 12DFN 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 |
| LTC3442EDE#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2.4V to 5.5V 12-Pin DFN EP T/R |
| LTC3442EDE#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 12DFN 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 |
发布紧急采购，3分钟左右您将得到回复。