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參數資料
| 型號： | TC120503EHA |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | PWM/PFM Step-Down Combination Regulator/Controller |
| 中文描述： | PWM / PFM切換降壓組合穩壓器/控制器 |
| 文件頁數： | 1/14頁 |
| 文件大小： | 436K |
| 代理商： | TC120503EHA |
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 (V
IN
= 5V, V
OUT
= 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
μ
A (max) of supply
current (V
OUT
= 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
μ
A (max), and V
OUT
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
TC120333EHA
TC120303EHA
5.0
3.3
3.0
8-Pin SOP -40°C to +85°C
8-Pin SOP -40°C to +85°C
8-Pin SOP -40°C to +85°C
1
2
3
4
8
7
6
5
TC120
8-Pin SOP
EXTW
CPC
SHDN/SS
V
IN
GND
EXT
SENSE
L
X
TC120XX03
CPC
V
IN
EXTW
SHDN/SS
L
X
EXT
GND
SENSE
C
IN
D1
L1
V
OUT
V
IN
C
OUT
C
4.7nF
PWM/PFM Step-Down Combination Regulator/Controller
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TC120503EHATR | 功能描述:開關變換器、穩壓器與控制器 PWM/PFM Step-Down RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TC1207D-100M | 制造商:PRODUCTWELL 制造商全稱:PRODUCTWELL 功能描述:TOROID INDUCTORS |
| TC1207D-320M | 制造商:PRODUCTWELL 制造商全稱:PRODUCTWELL 功能描述:TOROID INDUCTORS |
| TC1210A | 制造商:Thomas & Betts 功能描述:Fittings Connector 4inch Steel |
| TC12-11CGKWA | 制造商:Kingbright Corporation 功能描述:DOT MATRIX 1.2" CMN CATHODE GREEN 制造商:Kingbright Corporation 功能描述:DOT MATRIX, 1.2" CMN CATHODE, GREEN 制造商:Kingbright Corporation 功能描述:DOT MATRIX, 1.2" CMN CATHODE, GREEN; Display Dots x Lines:5 x 7; LED Color:Green; Luminous Intensity:73mcd; LED Display Type:Dot Matrix; Peak Wavelength:574nm; Forward Voltage:2.1V; Display Size:22.9mm x 39mm ;RoHS Compliant: Yes |
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