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| 型号： | TC120303EHA |
| 元件分类： | 稳压器 |
| 英文描述： | 0.7 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LOW PROFILE, SOP-8 |
| 文件页数： | 1/14页 |
| 文件大小： | 436K |
| 代理商： | TC120303EHA |
2002 Microchip Technology Inc.
DS21365B-page 1
TC120
Features
Internal Switching Transistor Supports 600mA
Output Current
External Switching Transistor Control for Output
Currents of 2A+
300kHz Oscillator Frequency Supports Small
Inductor Size
Short Circuit Protection
Built-In Undervoltage Lockout
95% Typical Efficiency
Automatic Switchover to Current-Saving PFM
Mode at Low Output Loads
Automatic Output Capacitor Discharge While in
Shutdown
Programmable Soft-Start
Power-Saving Shutdown Mode
Small 8-Pin SOP Package
Applications
Portable Test Equipment
Local Logic Supplies
Portable Audio Systems
Portable Scanners
Palmtops
Electronic Organizers
Device Selection Table
Package Type
General Description
TC120 is a 300kHz PFM/PWM step-down (Buck) DC/
DC regulator/controller combination for use in systems
operating from two or more cells, or in line-powered
applications. It uses PWM as the primary modulation
scheme, but automatically converts to PFM at low
output loads for greater efficiency. It requires only an
external inductor, Schottky diode, and two capacitors to
implement a step-down converter having a maximum
output current of 600mA (VIN =5V, VOUT =3.3V). An
external switching transistor (P-channel MOSFET) can
be added to increase output current capability to
support output loads of 2A or more.
The TC120 consumes only 55
A (max) of supply
current (VOUT = 3.3V) and can be placed in shutdown
mode by bringing the shutdown input (SHDN)low.
During shutdown, the regulator is disabled, supply
current is reduced to 2.5
A(max), and VOUT is
internally pulled to ground, discharging the output
capacitor. Normal operation resumes when SHDN is
brought high. Other features include a built-in under-
voltage lockout (UVLO), an externally programmable
soft start time, and output short circuit protection. The
TC120 operates from a maximum input voltage of 10V
and is available in a low-profile 8-Pin SOP package.
Functional Block Diagram
Part
Number
Output
Voltage
(V)
Package
Operating
Temp.
Range
TC120503EHA
5.0
8-Pin SOP -40°C to +85°C
TC120333EHA
3.3
8-Pin SOP -40°C to +85°C
TC120303EHA
3.0
8-Pin SOP -40°C to +85°C
1
2
3
4
8
7
6
5
TC120
8-Pin SOP
EXTW
CPC
SHDN/SS
VIN
GND
EXT
SENSE
LX
TC120XX03
VIN
EXTW
CPC
SHDN/SS
LX
EXT
GND
SENSE
CIN
D1
L1
VOUT
VIN
COUT
CSS
4.7nF
PWM/PFM Step-Down Combination Regulator/Controller
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC120303EHATR | 功能描述:开关变换器、稳压器与控制器 PWM/PFM Step-Down 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 |
| TC120333EHA | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM/PFM Step-Down Combination Regulator/Controller |
| TC120333EHATR | 功能描述:开关变换器、稳压器与控制器 PWM/PFM Step-Down 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 |
| TC120503EHA | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM/PFM Step-Down Combination Regulator/Controller |
| TC120503EHATR | 功能描述:开关变换器、稳压器与控制器 PWM/PFM Step-Down 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 |
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