 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
AS1339 датащи(PDF) 1 Page - ams AG |
|
|
|||||||||||||||||||||||||||||
AS1339 датащи(HTML) 1 Page - ams AG |
|
|
1 / 25 page  AS1339 650mA RF Step-Down DC-DC for PA , with two LDOs Datash eet www.austriamicrosystems.com Revision 1.04 1 - 25 1 General Description The AS1339 is a high-frequency step-down converter optimized for dynamically powering the power amplifier (PA) in WCDMA or NCDMA handsets. The device uses a 110m Ω typical bypass FET to power the PA directly from the battery during high-power transmission. The IC integrates two 10mA low-noise, low-dropout regulators (LDOs) for PA biasing. With a switching frequency of 2MHz, the device allows optimization for smallest solution size or highest efficiency. The AS1339 supports fast switching using small ceramic 10μF input and 4.7µF output capacitors to maintain low ripple voltage. The AS1339 uses an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment. The gain from REFIN to OUT is 2.5V/V. At high-duty cycle, the device automatically switches to a bypass mode, connecting the input to the output through a low-impedance MOSFET. The LDOs are designed for low-noise operation, wherein each LDO in the device is individually enabled through its own logic control interface. The device is available in a 16-pin WLP (2x2mm) package. Figure 1. Typical Operating Circuit 2 Key Features ! Fixed Switching Frequency: 2MHz ! PA Step-Down Converter ! Low Dropout Voltage ! Low Output-Voltage Ripple ! Dynamic Output Voltage Control (0.8V to 3.75V) ! 30µs Settling Time for 0.8V to 3.4V Output Voltage Change ! 650mA Output Drive Capability ! Two 10mA Low-Noise LDOs ! Low Shutdown Current ! Supply Voltage Range: 2.7V to 5.5V ! Thermal Shutdown ! 16-pin WLP (2x2mm) package 3 Applications The AS1339 is ideal for WCDMA/NCDMA cellular handsets, Wireless PDAs, and Smartphones. LDO2 ON/OFF LDO1 ON/OFF Analog Control PA ON/OFF IN2 EN2 EN1 REFIN PA_EN IN1B IN1A PAB PAA LX PGND NC LDO1 LDO2 2.85V 2.85V VPA 0.8V to 3.75V VIN 2.7V to 5.5V 4.7µF 10µF VIN 2.7V to 5.5V 2.2µH AS1339 AGND 0.1µF 0.1µF 1µF TEST NC |
Аналогичный номер детали - AS1339 |
|
Аналогичное описание - AS1339 |
|
|
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
