- 您现在的位置：买卖IC网 > PDF目录97720 > TC125501ECTRT 0.4 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO5 PDF资料下载
参数资料
| 型号： | TC125501ECTRT |
| 元件分类： | 稳压器 |
| 英文描述： | 0.4 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | EIAJ, SC-74A, SOT-23A, 5 PIN |
| 文件页数： | 4/10页 |
| 文件大小： | 84K |
| 代理商： | TC125501ECTRT |
3
TC125
TC126
PFM Step-Up DC/DC Regulators
TC125/6-1 8/3/99
2001 Microchip Technology Inc
DS21372A
PIN DESCRIPTION
TC125 Pin #
TC126 Pin #
Name
Description
1
—
SHDN
Shutdown Input. A logic low on this input suspends device operation
and reduces supply current to less than 0.5
A. Device operation
resumes when SHDN is brought high.
—
1
SENSE
Voltage Sense Input. This input provides feedback voltage
sensing to the internal error amplifier. It must be connected to the
output voltage node, preferably the single point in the system where
tight voltage regulation is most beneficial.
2
—
PS
Power and Voltage Sense Input. This dual function input provides
both feedback voltage sensing and internal chip power. It should be
connected to the regulator output. (See Figure 1).
—
2
VDD
Power Supply Input.
3
NC
Not Connected.
4
GND
Ground Terminal.
5
LX
Inductor Switch Output. LX is the drain of an internal N-channel
switching transistor. This terminal drives the external inductor, which
ultimately provides current to the load.
TC125/6 OVERVIEW
The TC125/6 are PFM step-up DC/DC regulators for
use in systems operating from two or more cells or in low
voltage, line powered applications. Because Pulse Fre-
quency Modulation (PFM) is used, the TC125/6 switching
frequency (and therefore supply current) is minimized at low
output loads. This is especially important in battery operated
applications (such as pagers) that operate in standby mode
most of the time. For example, a TC125/6 with a 3V output
and no load will consume a maximum supply current of only
10
A versus a supply current of 40 A maximum when
IOUT = 30 mA. Both devices require only an external inductor,
diode, and capacitor to implement a complete DC/DC
converter.
The TC125 is recommended for applications requiring
shutdown mode as a means of reducing system supply
current. The TC125 is powered from the PS input, which
must be connected to the regulated output as shown in
Figure 1. PS also senses output voltage for closed-loop
regulation. Start-up current is furnished through the inductor
when input voltage is initially applied. This action starts the
oscillator, causing the voltage at the PS input to rise,
bootstrapping the regulator into full operation.
The TC126 (Figure 2) is recommended for all applica-
tions not requiring shutdown mode. It has separate VDD and
SENSE inputs, allowing it to be powered from any source of
2.2V to 10V in the system. The VDD input of the TC126 may
be connected to the VIN, VOUT, or an external DC voltage.
Lower values of VDD result in lower supply current, but lower
efficiency due to higher switch ON resistance. Higher VDD
values increase supply current, but drive the internal switch-
ing transistor harder (lowering RDSON), thereby increasing
efficiency.
Figure 1.Typical TC125 Circuit
Figure 2. Typical TC126 Circuit
L1
D1
SHUTDOWN
1
2
3
5
4
TC125
LX
SHDN
NC
PS
GND
1.5V
ON
OFF
CONTROL
100
H SUMIDA CD54
MA735
VOUT
3.3V @ 40mA
C1
47
F/16V
TANTALUM
L1
D1
1
2
3
4
5
TC126
LX
SENSE
NC
VDD
GND
3.3V
100
H SUMIDA CD54
MA735
VOUT
5V @ 80mA
C1
47
F/16V
TANTALUM
LINE
SUPPLY
相关PDF资料 |
PDF描述 |
|---|---|
| TC1684EUA | SWITCHED CAPACITOR CONVERTER, 170 kHz SWITCHING FREQ-MAX, PDSO8 |
| TC3402VQRRT/723 | 4-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16 |
| TC3402VQRRT/723 | 4-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16 |
| TC3402VQRTR/713 | 4-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16 |
| TC3402VQRTR/713 | 4-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC125501ECTTR | 功能描述:开关变换器、稳压器与控制器 PFM Step-up DC/DC RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TC125A | 制造商:Thomas & Betts 功能描述:Fittings Connector 1.5inch Steel |
| TC125SC-1 | 制造商:Thomas & Betts 功能描述:1-1/2 EMT SET SCREW CONN,EA |
| TC125-TB | 制造商:Thomas & Betts 功能描述:CABLE TIES |
| TC126 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PFM Step-Up DC/DC Regulators |
发布紧急采购，3分钟左右您将得到回复。