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| 型号： | AS1335-BTDT-100 |
| 厂商： | ams |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1V 1.5A 10WFDFN |
| 标准包装： | 1,000 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1V |
| 输入电压： | 2.6 V ~ 5.25 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 1.5A |
| 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-TDFN（3x3） |
AS1335
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Efficiency
The efficiency of a switching regulator is equivalent to:
Efficiency = (P OUT /P IN )x100%
(EQ 7)
For optimum design, an analysis of the AS1335 is needed to determine efficiency limitations and to determine design
changes for improved efficiency. Efficiency can be expressed as:
Efficiency = 100% – (L 1 + L 2 + L 3 + ...)
(EQ 8)
Where:
L 1 , L 2 , L 3 , etc. are the individual losses as a percentage of input power.
Althought all dissipative elements in the circuit produce losses, those four main sources should be considered for effi-
ciency calculation:
Input Voltage Quiescent Current Losses
The V IN current is the DC supply current given in the electrical characteristics which excludes MOSFET driver and con-
trol currents. V IN current results in a small (<0.1%) loss that increases with V IN , even at no load. The V IN quiescent cur-
rent loss dominates the efficiency loss at very low load currents.
I2R Losses
Most of the efficiency loss at medium to high load currents are attributed to I2R loss, and are calculated from the resis-
tances of the internal switches (R SW) and the external inductor (R L ). In continuous mode, the average output current
flowing through inductor L is split between the internal switches. Therefore, the series resistance looking into the SW
pin is a function of both NMOS & PMOS R DS(ON) as well as the the duty cycle (DC) and can be calculated as follows:
R SW = (R DS(ON)PMOS )(DC) + (R DS(ON)NMOS )(1 – DC)
(EQ 9)
The R DS(ON) for both MOSFETs can be obtained from the Electrical Characteristics on page 4 . Thus, to obtain I2R
losses calculate as follows:
I2R losses = I OUT 2(R SW + R L )
(EQ 10)
Switching Losses
The switching current is the sum of the control currents and the MOSFET driver. The MOSFET driver current results
from switching the gate capacitance of the power MOSFETs. If a MOSFET gate is switched from low to high to low
again, a packet of charge dQ moves from V IN to ground. The resulting dQ/dt is a current out of V IN that is typically
much larger than the DC bias current. In continuous mode:
I GC = f(Q PMOS + Q NMOS )
(EQ 11)
Where: Q PMOS and Q NMOS are the gate charges of the internal MOSFET switches.
The losses of the gate charges are proportional to V IN and thus their effects will be more visible at higher supply volt-
ages.
Other Losses
Basic losses in the design of a system should also be considered. Internal battery resistances and copper trace can
account for additional efficiency degradations in battery operated systems. By making sure that C IN has adequate
charge storage and very low ESR at the given switching frequency, the internal battery and fuse resistance losses can
be minimized. C IN and C OUT ESR dissipative losses and inductor core losses generally account for less than 2% total
additional loss.
Revision 1.03
14 - 18
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| AS1335-BTDT-AD | 功能描述:IC REG BUCK SYNC ADJ 10WFDFN 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 |
| AS1336A/B EB | 制造商:AMS 功能描述:BOARD EVAL FOR AS1336A/B |
| AS1336A/B-EB | 制造商:ams 功能描述:AS1336A/B Evaluation Board |
| AS1336A-BQFT | 功能描述:IC REG BST SYNC ADJ 75MA 16TQFN 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 |
| AS1336A-BQFT-AD | 制造商:AMS 功能描述:0 |
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