参数资料
| 型号： | AS1337A-BTDT |
| 厂商： | ams |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 8TDFN |
| 标准包装： | 1 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 5 V |
| 输入电压： | 0.65 V ~ 4.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 200mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-TDFN（3x3） |
| 其它名称： | AS1337A-BTDTDKR |
AS1337
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Component Selection
Only three power components are required to complete the design of the buck-boost converter, except the additional two resistors for the voltage
divider to set V OUT . The high operating frequency and low peak currents of the AS1337 allow the use of low value, low profile inductors and tiny
external ceramic capacitors.
Inductor Selection
The inductor should have low ESR to reduce the I2R power losses, and must be able to handle the peak inductor current without saturating.
High-frequency ferrite core inductor materials reduce frequency dependent power losses compared to less expensive powdered iron types,
which result in improved converter efficiency.
A 4.7μH to 15μH inductor value with a >850mA current rating and low DCR is recommended. For applications where radiated noise is a con-
cern, a toroidal or shielded inductor can be used.
Capacitor Selection
A 10μF capacitor is recommend for C IN as well as a 22μF for C OUT . Small-sized ceramic capacitors are recommended. X5R and X7R ceramic
capacitors are recommend as they retain capacitance over wide ranges of voltages and temperatures.
Output Capacitor Selection
Low ESR capacitors should be used to minimize V OUT ripple. Multi-layer ceramic capacitors are recommended since they have extremely low
ESR and are available in small footprints. A 1 to 10μF output capacitor is sufficient for most applications. Larger values up to 22μF may be used
to obtain extremely low output voltage ripple and improve transient response.
An additional phase lead capacitor may be required with output capacitors larger than 10μF to maintain acceptable phase margin. X5R and X7R
dielectric materials are recommended due to their ability to maintain capacitance over wide voltage and temperature ranges.
Input Capacitor Selection
Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. Ceramic capacitors are recom-
mended for input decoupling and should be located as close to the device as is practical. A 4.7μF input capacitor is sufficient for most applica-
tions. Larger values may be used without limitations.
Table 5. Recommended External Components
Name
C IN
C OUT
L1
Part Number
GRM219R60J106KE19
GRM21BR60J226ME39
MOS6020-472ML
Value
10μF
22μF
4.7μH
Rating
6.3V
6.3V
1.82A
Type
X5R
X5R
50m Ω
Size
0805
0805
6.8x6.0x2.4mm
Manufacturer
Murata
Coilcraft
PCB Layout Guidelines
The high-speed operation of the AS1337 requires proper layout for optimum performance.
A large ground pin copper area will help to lower the device temperature.
A multi-layer board with a separate ground plane is recommended.
Traces carrying large currents should be direct.
Trace area at pin FB should be as small as is practical.
The lead-length to the battery should be as short as is practical.
Revision 1.05
11 - 15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1337A-BTDT EB | 制造商:ams 功能描述:Evaluation Board |
| AS1337A-TD_EK_ST | 功能描述:AS1337A - DC/DC, Step Up or Down 1, Non-Isolated Outputs Evaluation Board 制造商:ams 系列:- 零件状态:过期 主要用途:DC/DC，步升/步降 输出和类型:1，非隔离 功率 - 输出:- 电压 - 输出:3.3V 电流 - 输出:200mA 电压 - 输入:0.65 V ~ 4.5 V 稳压器拓扑:升压，降压 频率 - 开关:1.2MHz 板类型:完全填充 所含物品:板 使用的 IC/零件:AS1337A 标准包装:1 |
| AS1337BBTDT | 制造商:ams 功能描述:T&R / TDFN 3x3 10 |
| AS1337B-BTDT | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| AS1339 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:650mA RF Step-Down DC-DC for PA, with two LDOs |
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