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TC1303B

更新时间: 2024-09-20 07:04:11
品牌 Logo 应用领域
美国微芯 - MICROCHIP 稳压器
页数 文件大小 规格书
30页 581K
描述
500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output

TC1303B 数据手册

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TC1303B  
500 mA Synchronous Buck Regulator,  
+ 300 mA LDO with Power-Good Output  
Features  
Description  
• Dual-Output Regulator (500 mA Buck Regulator  
and 300 mA Low-Dropout Regulator)  
The TC1303B combines a 500 mA synchronous buck  
regulator and 300 mA Low-Dropout Regulator (LDO)  
with a power-good monitor to provide a highly  
integrated solution for devices that require multiple  
supply voltages. The unique combination of an  
integrated buck switching regulator and low-dropout  
linear regulator provides the lowest system cost for  
dual-output voltage applications that require one lower  
processor core voltage and one higher bias voltage.  
• Power-Good Output with 300 ms Delay  
Total Device Quiescent Current = 65 µA, Typ.  
• Independent Shutdown for Buck and LDO  
Outputs  
• Both Outputs Internally Compensated  
• Synchronous Buck Regulator:  
- Over 90% Typical Efficiency  
The 500 mA synchronous buck regulator switches at a  
fixed frequency of 2.0 MHz when the load is heavy  
providing a low noise, small-size solution. When the  
load on the buck output is reduced to light levels, it  
changes operation to a Pulse Frequency Modulation  
(PFM) mode to minimize quiescent current draw from  
the battery. No intervention is necessary for smooth  
transition from one mode to another.  
- 2.0 MHz Fixed Frequency PWM  
(Heavy Load)  
- Low Output Noise  
- Automatic PWM to PFM mode transition  
- Adjustable (0.8V to 4.5V) and Standard Fixed  
Output Voltages (0.8V, 1.2V, 1.5V, 1.8V, 2.5V,  
3.3V)  
The LDO provides a 300 mA auxiliary output that  
requires a single 1 µF ceramic output capacitor,  
minimizing board area and cost. The typical dropout  
voltage for the LDO output is 137 mV for a 200 mA  
load.  
• Low-Dropout Regulator:  
- Low-Dropout Voltage = 137 mV Typ. @  
200 mA  
- Standard Fixed Output Voltages  
(1.5V, 1.8V, 2.5V, 3.3V)  
For the TC1303B, the power-good output logic level is  
based on the regulation of the LDO output only. The  
buck regulator can be turned on and off without affecting  
the power-good signal.  
• Power-Good Function:  
- Monitors LDO Output Function (TC1303B)  
- 300 ms Delay Used for Processor Reset  
• Small 10-pin 3X3 DFN or MSOP Package  
Options  
The TC1303B is available in either the 10-pin DFN or  
MSOP package.  
• Operating Junction Temperature Range:  
- -40°C to +125°C  
Additional protection features include: UVLO,  
overtemperature and overcurrent protection on both  
outputs.  
• Undervoltage Lockout (UVLO)  
• Output Short Circuit Protection  
• Overtemperature Protection  
For a complete listing of TC1303B standard parts, con-  
sult your Microchip representative.  
Applications  
Package Type  
• Cellular Phones  
10-Lead DFN  
10-Lead MSOP  
• Portable Computers  
• USB Powered Devices  
• Handheld Medical Instruments  
• Organizers and PDAs  
P
10  
9
SHDN2  
1
2
3
4
5
P
GND  
SHDN2  
1
2
3
4
5
10  
9
GND  
V
L
V
L
IN2  
X
IN2  
X
V
V
8
IN1  
V
OUT2  
OUT2  
V
IN1  
8
7
SHDN1  
PG  
7
SHDN1  
PG  
V
/V  
A
6
FB1 OUT1  
GND  
A
6
GND  
V
/V  
FB1 OUT1  
© 2005 Microchip Technology Inc.  
DS21949A-page 1  

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