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参数资料
| 型号： | TC120333EHATR |
| 元件分类： | 稳压器 |
| 英文描述： | 0.7 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP, 8 PIN |
| 文件页数： | 1/10页 |
| 文件大小： | 80K |
| 代理商： | TC120333EHATR |
1
TC120
PWM/PFM STEP-DOWN COMBINATION
REGULATOR/CONTROLLER
TC120-1 7/27/99
PWM/PFM STEP-DOWN COMBINATION REGULATOR/CONTROLLER
FEATURES
s
Internal Switching Transistor Supports 600 mA
Output Current
s
External Switching Transistor Control for Output
Currents of 2A+
s
300 KHz Oscillator Frequency Supports Small
Inductor Size
s
Short Circuit Protection
s
Built-In Undervoltage Lockout
s
High (95%, Typ) Efficiency
s
Automatic Switchover to Current-Saving PFM
Mode at Low Output Loads
s
Automatic Output Capacitor Discharge While in
Shutdown
s
Programmable Soft-Start Time
s
Power-Saving Shutdown Mode
s
Small 8-Pin SOP Package
TYPICAL APPLICATIONS
s
Portable Test Equipment
s
Local Logic Supplies
s
Portable Audio Systems
s
Portable Scanners
s
Palmtops
s
Electronic Organizers
GENERAL DESCRIPTION
TC120 is a 300 KHz PFM/PWM step-down (Buck) DC/
DC regulator/controller combination for use in systems
operating from two or more cells, or in line-powered applica-
tions. 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 con-
verter having a maximum output current of 600 mA (VIN =5V,
VOUT = 3.3V). An external switching transistor (P-channel
MOSFET) can be added to increase output current capabil-
ity to support output loads of 2A or more.
The TC120 consumes only 39
A (max) of supply
current (VOUT = 3.3V) and can be placed in shutdown mode
by bringing the shutdown input (SHDN) low. During shut-
down, the regulator is disabled, supply current is reduced to
2.5
A(max), and VOUT is internally pulled to ground, dis-
charging the output capacitor. Normal operation resumes
when SHDN is brought high. Other features include a built-
in undervoltage lockout (UVLO), an externally program-
mable 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.
TYPICAL APPLICATION
TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.
PIN CONFIGURATION
ORDERING INFORMATION
Part No.
Output
Package
Temperature
Voltage (V)
Range
TC120303EHA
3.0
8-Pin SOP – 40
°C to +85°C
TC120333EHA
3.3
8-Pin SOP – 40
°C to +85°C
TC120503EHA
5.0
8-Pin SOP – 40
°C to +85°C
TC120303
VIN
EXTW
CPC
SHDN/SS
LX
EXT
GND
SENSE
47
F/16V
Tantalum
CSS
4.7 nF
IN5817
L1
22
H
VOUT = 3V
VIN = 5V
COUT
47
F/10V
Tantalum
5V to 3.0V, 500 mA Step-Down Converter
1
2
3
4
8
7
6
5
TC120
8-Pin SOP
EXTW
CPC
SHDN/SS
VIN
GND
EXT
SENSE
LX
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| TC1207D-100M | 制造商:PRODUCTWELL 制造商全称:PRODUCTWELL 功能描述:TOROID INDUCTORS |
| TC1207D-320M | 制造商:PRODUCTWELL 制造商全称:PRODUCTWELL 功能描述:TOROID INDUCTORS |
| TC1210A | 制造商:Thomas & Betts 功能描述:Fittings Connector 4inch Steel |
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