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| 型号： | AS7620B-BQFT |
| 厂商： | ams |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 0.5A 12MLPQ |
| 设计资源： | Design Support Tool |
| 标准包装： | 6,000 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 3.6 V ~ 32 V |
| PWM 型： | 混合物 |
| 电流 - 输出： | 500mA |
| 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： | 12-VQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 12-MLPQ（4x4） |
AS7620
Datasheet - D e t a i l e d D e s c r i p t i o n
The AS7620-B features a 3.3V fixed output voltage. The AS7620-A provides an adjustable output from 1.2V (V REF ) up to virtually V IN (see
100% Duty Cycle Operation on page 11) . To select the desired V OUT , the related resistor divider has to be tuned according to the following
formula:
V OUT = V REF ? ? 1 + ------- ?
Rl ?
?
Rh
(EQ 1)
Where:
Rh is the high side resistor of the output divider
Rl is the resistor of the output divider
Note: It is suggested to select resistors in the range of hundreds of k ? in order to limit the current consumption.
8.5 Current Limit
The current is sensed during the on time of the internal PMOS. Three different current limit thresholds can be selected by the ILIM pin:
1. 240mA (typ) ILIM shorted to GND
2. 720mA (typ) ILIM shorted to V OUT (from 1.5V to 3.6V)
3. 1000mA (typ) ILIM floating
This threshold is intended as peak current limit. If the current reaches the threshold during the on time, the PMOS is turned off and it will be
turned on again only when the current approaches 0A and the feedback voltage is equal or lower than V REF . The maximum output current is
ILIM/2.
8.6 Switching Frequency
The switching frequency (f sw ) changes according to the application conditions and, in particular, to the output current in order to optimize the
efficiency in any load condition. Anyway, it is always possible to estimate the f sw during the design process. As described in the Regulation (refer
to page 8) – the converter always works in DCM and, normally, the peak current into the inductor is the CL threshold (ILIM). The average of the
inductor current must be equal to the output current. The following formula provides the relationship between inductor current and output current:
ILIM ? L ? V
I OUT = ---------- ? --- ? --------------------------------------------------
2 ? I OUT ? ( V IN – V OUT ) ? V OUT
Fsw = ----------------------------------------------------------------------------
ILIM ? L ? V IN
2
1 1 IN
Tsw 2 ( V IN – V OUT ) ? V OUT
Consequently, the f sw can be expressed as following:
2
Figure 18. Chart Illustrating the Fsw vs. I OUT in a Standard Application (V IN =24V, V OUT =3.3V, L=10μH, ILIM=1A)
Fsw vs. Iout
300
250
200
150
100
50
0
(EQ 2)
(EQ 3)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
Iout (A)
www.ams.com/DC-DC_Step-Up/AS7620
Revision 1.18
9 - 16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS7620BBQFT500 | 制造商:AMS 功能描述:IC STEP-DOWN DC/DC CONVERTER MLPQ-12 制造商:AMS 功能描述:IC, STEP-DOWN DC/DC CONVERTER, MLPQ-12; Primary Input Voltage:24V; No. of Outputs:1; Output Voltage:3.3V; Output Current:500mA; No. of Pins:12; Operating Temperature Min:-40C; Operating Temperature Max:125C; Package / Case:12-MLPQ ;RoHS Compliant: Yes |
| AS7620B-BQFT-500 | 功能描述:IC REG BUCK 3.3V 0.5A 12MLPQ 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| AS7620EB | 制造商:AMS 功能描述:Evaluation Board for AS7620 High Voltage Step-Down Converter |
| AS7620QF_EK_ST | 功能描述:AS7620 - DC/DC, Step Down with LDO 1, Non-Isolated Outputs Evaluation Board 制造商:ams 系列:- 零件状态:有效 主要用途:DC/DC，LDO 步降 输出和类型:1，非隔离 功率 - 输出:- 电压 - 输出:- 电流 - 输出:- 电压 - 输入:3.6 V ~ 32 V 稳压器拓扑:降压 频率 - 开关:- 板类型:完全填充 所含物品:板 使用的 IC/零件:AS7620 标准包装:1 |
| AS762R0FLF | 制造商:TT Electronics / IRC 功能描述:AS762R0FLF |
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