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參數資料
| 型號： | TC1303B-EN0EMFTR |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| 中文描述： | 500毫安同步降壓穩壓器，300 mA的LDO具有電源就緒輸出 |
| 文件頁數： | 1/30頁 |
| 文件大小： | 441K |
| 代理商： | TC1303B-EN0EMFTR |
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2005 Microchip Technology Inc.
DS21949A-page 1
TC1303B
Features
Dual-Output Regulator (500 mA Buck Regulator
and 300 mA Low-Dropout Regulator)
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
- 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)
Low-Dropout Regulator:
- Low-Dropout Voltage = 137 mV Typ. @
200 mA
- Standard Fixed Output Voltages
(1.5V, 1.8V, 2.5V, 3.3V)
Power-Good Function:
- Monitors LDO Output Function (
TC1303B
)
- 300 ms Delay Used for Processor Reset
Small 10-pin 3X3 DFN or MSOP Package
Options
Operating Junction Temperature Range:
- -40°C to +125°C
Undervoltage Lockout (UVLO)
Output Short Circuit Protection
Overtemperature Protection
Applications
Cellular Phones
Portable Computers
USB Powered Devices
Handheld Medical Instruments
Organizers and PDAs
Description
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.
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.
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.
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.
The TC1303B is available in either the 10-pin DFN or
MSOP package.
Additional
protection
features
overtemperature and overcurrent protection on both
outputs.
For a complete listing of TC1303B standard parts, con-
sult your Microchip representative.
include:
UVLO,
Package Type
10-Lead DFN
1
2
6
8
7
9
10
5
4
3
SHDN2
V
IN2
V
OUT2
A
GND
P
GND
L
X
V
IN1
SHDN1
V
FB1
/V
OUT1
PG
10-Lead MSOP
1
2
3
6
8
7
9
10
5
4
SHDN2
V
IN2
V
OUT2
A
GND
P
GND
L
X
V
IN1
SHDN1
V
FB1
/V
OUT1
PG
500 mA Synchronous Buck Regulator,
+ 300 mA LDO with Power-Good Output
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| TC1303B-EN0EUN | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
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| TC1303B-EO2EUNTR | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303B-EO3EMF | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303B-EO3EMFTR | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TC1303B-IA0EMF | 功能描述:低壓差穩壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1303B-IA0EMFTR | 功能描述:低壓差穩壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1303B-IA0EUN | 功能描述:低壓差穩壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1303B-IA0EUNTR | 功能描述:低壓差穩壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1303B-PA0EMF | 功能描述:低壓差穩壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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