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| 型号： | TC120503EHATR |
| 厂商： | Microchip Technology |
| 文件页数： | 1/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 0.6A 8SOP |
| 标准包装： | 1,000 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 1.8 V ~ 10 V |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOP |
TC120
PWM/PFM Step-Down Combination Regulator/Controller
Features
? Internal Switching Transistor Supports 600mA
Output Current
Package Type
8-Pin SOP
? External Switching Transistor Control for Output
V IN 1
8
L X
Currents of 2A+
? 300kHz Oscillator Frequency Supports Small
Inductor Size
? Short Circuit Protection
EXTW 2
CPC 3
SHDN/SS 4
TC120
7
6
5
EXT
GND
SENSE
? 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
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
?
?
?
?
?
Local Logic Supplies
Portable Audio Systems
Portable Scanners
Palmtops
Electronic Organizers
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
Device Selection Table
current is reduced to 2.5 μ A (max), and V OUT is
internally pulled to ground, discharging the output
Part
Number
Output
Voltage
(V)
Package
Operating
Temp.
Range
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
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
TC120 operates from a maximum input voltage of 10V
and is available in a low-profile 8-Pin SOP package.
Functional Block Diagram
V IN
2002 Microchip Technology Inc.
C IN
C SS
4.7nF
L X
V IN
EXTW
EXT
TC120XX03
GND
CPC
SHDN/SS
SENSE
D1
L1
V OUT
C OUT
DS21365B-page 1
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