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參數(shù)資料
| 型號(hào)： | TC120 |
| 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(wěn)壓器/控制器 |
| 文件頁(yè)數(shù)： | 1/14頁(yè) |
| 文件大?。?/td> | 436K |
| 代理商： | TC120 |
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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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC120333EHA | PWM/PFM Step-Down Combination Regulator/Controller |
| TC120503EHA | PWM/PFM Step-Down Combination Regulator/Controller |
| TC1223 | 50mA and 100mA CMOS LDOs with Shutdown |
| TC1223-XXVCT | 50mA and 100mA CMOS LDOs with Shutdown |
| TC1224-XXVCT | 50mA and 100mA CMOS LDOs with Shutdown |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC-120 | 制造商:PROTECTIVE CLOSURES 功能描述: |
| TC-120.000MBD-T | 功能描述:標(biāo)準(zhǔn)時(shí)鐘振蕩器 120.000MHz 3.3V 25ppm -40C to 85C RoHS:否 制造商:AVX 產(chǎn)品:Standard Clock Oscillators 封裝 / 箱體:7 mm x 5 mm 頻率:75 MHz 頻率穩(wěn)定性:50 PPM 電源電壓:2.5 V 負(fù)載電容: 端接類(lèi)型:SMD/SMT 最小工作溫度:0 C 最大工作溫度:+ 70 C 輸出格式:LVDS 尺寸: 封裝:Reel 系列: |
| TC-120.000MBE-T | 制造商:TXC Corporation 功能描述:OSC MEMS 120.000 MHZ 3.3V SMD |
| TC-120.000MCD-T | 功能描述:標(biāo)準(zhǔn)時(shí)鐘振蕩器 120.000MHz 2.5V 25ppm -40C to 85C RoHS:否 制造商:AVX 產(chǎn)品:Standard Clock Oscillators 封裝 / 箱體:7 mm x 5 mm 頻率:75 MHz 頻率穩(wěn)定性:50 PPM 電源電壓:2.5 V 負(fù)載電容: 端接類(lèi)型:SMD/SMT 最小工作溫度:0 C 最大工作溫度:+ 70 C 輸出格式:LVDS 尺寸: 封裝:Reel 系列: |
| TC-120.000MCE-T | 制造商:TXC Corporation 功能描述:OSC MEMS 120.000 MHZ 2.5V SMD |
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