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| 型号： | AS1326A-BTDT |
| 厂商： | AUSTRIAMICROSYSTEMS AG |
| 元件分类： | DC/DC变换器 |
| 英文描述： | Adj. 650mA, 1MHz, Boost |
| 中文描述： | 高电流0.8A的DC - DC升压转换器 |
| 文件页数： | 9/18页 |
| 文件大小： | 1108K |
| 代理商： | AS1326A-BTDT |
www.austriamicrosystems.com
Revision 1.05
9 - 18
AS1326
Datasheet - Detailed Description
8 Detailed Description
The AS1326A/AS1326B are high-efficiency, low-noise DC-DC boost converters suitable as power supplies for portable
devices. Both devices feature integrated boost switching regulator, N-channel power MOSFET, P-channel synchro-
nous rectifier, precision reference, and shutdown control circuitry
(see Figure 1 on page 1)
.
The AS1326A/AS1326B are able to boost a 1- to 3-cell battery voltage input to a fixed 3.3V output, or adjustable output
between 2.5 and 5.0V (an external Schottky diode is required for output voltages greater than 4V).
The devices are guaranteed to startup with an input voltage as low as 1.1V and remain operational down to an input of
as little as 0.7V, and are optimized for use in mobile phones and other RF applications which have low noise and low
quiescent current (extended battery life) requirements.
The integrated shutdown circuitry reduces device quiescent current down to 0.1μA.
Step-Up Converter
During boost operation, the internal N-channel MOSFET switch turns on for the first part of each cycle, allowing current
to ramp up in the inductor and store energy in a magnetic field. During the second part of each cycle, the MOSFET
turns off and inductor current flows through the synchronous rectifier to the output filter capacitor and the load. As the
energy stored in the inductor is depleted, the current ramps down and the synchronous rectifier turns off.
At light loads, the device operates at fixed-frequency or only as needed to maintain regulation, depending on the set-
ting of pin CLK/SEL
(see Table 6)
.
Operational Modes
The AS1326A/AS1326B are capable of operating in 3 different modes
(see Table 6)
as controlled by pin CLK/SEL
(see
page 2)
.
Normal Operation
When CLK/SEL is pulled low, the devices are in normal operating mode. In normal mode the devices operate in PWM
when driving medium-to-heavy loads, and automatically switches to automatic powersave mode if the load requires
less power. The use of automatic powersave mode will boost the efficiency futhermore at light-load conditions.
Forced-PWM Operation
Pulling CLK/SEL high, selects the low-noise PWM-only mode. During forced-PWM operation, the devices switch at a
constant frequency (1MHz) and modulates the MOSFET switch pulse width to control the power transferred per cycle
to regulate the output voltage. Switching harmonics generated by fixed-frequency operation are consistent and can be
filtered. See the Noise Spectrum plot in the Typical Operating Characteristics
(see Figure 14 on page 7)
.
Table 5. Typical Output Voltages and Currents
# of NiCd/NiMh Cells
Input Voltage (V)
Output Voltage (V)
Output Current (mA)
1
1.2
3.3
335
2
2.4
3.3
800
2.4
5.0
450
3
3.6
5.0
800
Table 6. Operational Modes
CLK/SEL Setting
Operational Mode
Description
0
Normal
High-efficiency at all loads; Fixed-frequency (1MHz) at heavy and
medium loads.
1
Forced PWM
Fixed-frequency (1MHz), low-noise at all loads. V
IN
≤
0.75xV
OUT
External 500kHz to
1.2MHz clock
Synchronized PWM
Fixed-frequency, low-noise at all loads. V
IN
≤
0.75xV
OUT
相关PDF资料 |
PDF描述 |
|---|---|
| AS1326B-BTDT | Adj. 650mA, 1MHz, Boost; Package Type: TDFN(3x3)-10; Miscellaneous: Logic-High On |
| AS1329A-BTTT | Adj. 315mA, 1.2MHz Boost feed.; Package Type: TSOT23-6; Miscellaneous: (medium loads); Miscellaneous: Powersave Operation |
| AS1329B-BTTT | Adj. 315mA, 1.2MHz Boost feed.; Package Type: TSOT23-6; Miscellaneous: (light loads); Miscellaneous: Powersave Operation |
| AS1329C-BTTT | Adj. 315mA, 1.2MHz Boost feed.; Package Type: TSOT23-6; Miscellaneous: Continuous Switching |
| AS1331-BTDT-AD | 300mA Buck-Boost Converter; Package Type: TDFN(3x3)-10; Output Range: 2.5 to 3.3V |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1326A-BTDT-1K | 功能描述:IC REG BST SYNC 3.3V/ADJ 10-TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:50 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:5 V ~ 25 V 输入电压:2.3 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:600kHz，1.2MHz 电流 - 输出:1A 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-TSSOP，8-MSOP（0.118"，3.00mm 宽） 包装:管件 供应商设备封装:8-MSOP |
| AS1326A-BTDU | 制造商:ams 功能描述:DC-DC Step Up, Fixed, Sync, 0.7 to 5.0V input, 3.3, 2.5 to 5.0V (650mA) Output, 96% Efficiency, 1200 kHz fmax, TDFN-10, Synchronizes to External Clock, Tray |
| AS1326A-TD_EK_ST | 功能描述:AS1326 - DC/DC, Step Up 1, Non-Isolated Outputs Evaluation Board 制造商:ams 系列:- 零件状态:有效 主要用途:DC/DC，步升 输出和类型:1，非隔离 功率 - 输出:- 电压 - 输出:3.3V 电流 - 输出:800mA 电压 - 输入:0.7 V ~ 5 V 稳压器拓扑:升压 频率 - 开关:1MHz 板类型:完全填充 所含物品:板 使用的 IC/零件:AS1326 标准包装:1 |
| AS1326B | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:High Current, 0.8A DC-DC Step-Up Converters |
| AS1326B-BTDR | 功能描述:IC REG BST SYNC 3.3V/ADJ 10TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
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