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参数资料
| 型号： | LTC3441EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16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
OPERATIO
The LTC3441 provides high efficiency, low noise power for
applications such as portable instrumentation. The LTC
proprietary topology allows input voltages above, below or
equal to the output voltage by properly phasing the output
switches. The error amp output voltage on the V C pin de-
termines the output duty cycle of the switches. Since the
V C pin is a filtered signal, it provides rejection of frequen-
cies from well below the switching frequency. The low
R DS(ON) , low gate charge synchronous switches provide
high frequency pulse width modulation control at high
efficiency. Schottky diodes across the synchronous switch
D and synchronous switch B are not required, but provide
a lower drop during the break-before-make time (typically
15ns). The addition of the Schottky diodes will improve peak
efficiency by typically 1% to 2%. High efficiency is achieved
at light loads when Burst Mode operation is entered and
when the IC’s quiescent current is a low 25 μ A.
LOW NOISE FIXED FREQUENCY OPERATION
Reverse Current Limit
The reverse current limit amplifier monitors the inductor
current from the output through switch D. Once a negative
inductor current exceeds – 800mA typical, the IC will shut
off switch D.
Output Switch Control
Figure 1 shows a simplified diagram of how the four
internal switches are connected to the inductor, V IN , V OUT
and GND. Figure 2 shows the regions of operation for the
LTC3441 as a function of the internal control voltage, V CI .
The V CI voltage is a level shifted voltage from the output of
the error amp (V C pin) (see Figure 5). The output switches
are properly phased so the transfer between operation
modes is continuous, filtered and transparent to the user.
When V IN approaches V OUT the Buck/Boost region is
reached where the conduction time of the four switch
region is typically 150ns. Referring to Figures 1 and 2, the
various regions of operation will now be described.
Oscillator
PV IN
V OUT
The frequency of operation is factory trimmed to 1MHz.
9
8
V OUT
The oscillator can be synchronized with an external clock
applied to the MODE/SYNC pin. A clock frequency of twice
the desired switching frequency and with a pulse width of
at least 100ns is applied. The oscillator sync range is
PMOS A
SW1
4
NMOS B
SW2
5
PMOS D
NMOS C
1.15MHz to 1.7MHz (2.3MHz to 3.4MHz sync frequency).
3441 F01
Error Amp
The error amplifier is a voltage mode amplifier. The loop
Figure 1. Simplified Diagram of Output Switches
compensation components are configured around the
amplifier to obtain stability of the converter. The SHDN/SS
pin will clamp the error amp output, V C , to provide a soft-
start function.
Supply Current Limit
75%
D MAX
BOOST
D MIN
BOOST
D MAX
BUCK
A ON, B OFF
PWM CD SWITCHES
FOUR SWITCH PWM
BOOST REGION
BUCK/BOOST REGION
V4 ( ≈ 2.05V)
V3 ( ≈ 1.65V)
V2 ( ≈ 1.55V)
The current limit amplifier will shut PMOS switch A off
once the current exceeds 4A typical. Before the switch
current limit, the average current limit amp (3.2A typical)
will source current into the FB pin to drop the output
voltage. The current amplifier delay to output is typically
0%
DUTY
CYCLE
D ON, C OFF
PWM AB SWITCHES BUCK REGION
3441 F02
V1 ( ≈ 0.9V)
INTERNAL
CONTROL
VOLTAGE, V CI
50ns.
Figure 2. Switch Control vs Internal Control Voltage, V CI
3441fa
7
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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 |
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