- 您现在的位置：买卖IC网 > PDF目录17360 > AS1339 EB (ams)BOARD EVAL AS1339 PDF资料下载
参数资料
| 型号： | AS1339 EB |
| 厂商： | ams |
| 文件页数： | 2/26页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL AS1339 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 3，非隔离 |
| 输出电压： | 0.8 ~ 3.75 V，2.85V，2.85V |
| 电流 - 输出： | 650mA |
| 输入电压： | 2.7 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AS1339 |
Da t as heet
AS1339
6 5 0 m A R F St e p - D o w n D C - D C f o r PA, w i t h t w o L D O s
1 General Description
2 Key Features
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 10 μ F 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
!
!
!
!
!
!
!
!
!
!
!
!
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
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. AS1339 - Typical Operating Circuit
3 Applications
The AS1339 is ideal for WCDMA/NCDMA cellular
handsets, Wireless PDAs, and Smartphones.
V IN
2.7V to 5.5V
10μF
IN1A
IN1B
PAA
PAB
LX
V PA
0.8V to 3.75V
2.2μH
4.7μF
Analog Control
PA ON/OFF
REFIN
PA_EN
AS1339
PGND
NC
LDO1 ON/OFF
LDO2 ON/OFF
NC
V IN
2.7V to 5.5V
EN1
EN2
TEST
IN2
LDO1
LDO2
2.85V
0.1μF
2.85V
1μF
AGND
Revision 1.05
0.1μF
1 - 25
相关PDF资料 |
PDF描述 |
|---|---|
| RB-1512S/H | CONV DC/DC 1W 15VIN 12VOUT |
| MIC2545A-2BM | IC SW CURR LIMIT HI SIDE 8-SOP |
| F971A336MCC | CAP TANT 33UF 10V 20% 2312 |
| RB-1509S/H | CONV DC/DC 1W 15VIN 09VOUT |
| SB350-E3/54 | DIODE SCHOTTKY 50V 3A AXIAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AS133R0HLF | 制造商:TT Electronics / IRC 功能描述:AS133R0HLF |
| AS133R0JLF | 制造商:TT Electronics / IRC 功能描述:AS133R0JLF |
| AS133R2FLF | 制造商:TT Electronics / IRC 功能描述:AS133R2FLF |
| AS133R2HLF | 制造商:TT Electronics / IRC 功能描述:AS133R2HLF |
| AS133R2JLF | 制造商:TT Electronics / IRC 功能描述:AS133R2JLF |
发布紧急采购，3分钟左右您将得到回复。