Datasheet > AS1335-BTDT-100

AS1335-BTDT-100

更新时间： 2024-01-02 06:07:00

品牌	Logo	应用领域
艾迈斯 - AMSCO		转换器
页数	文件大小	规格书
18页	1650K
描述
1.5A, 1.5MHz, Synchronous DC/DC Step-Down Converter

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AS1335-BTDT-100 技术参数

生命周期：	Unknown	Reach Compliance Code：	unknown
风险等级：	5.76	Base Number Matches：	1

AS1335-BTDT-100 数据手册

AS1335

Datasheet - Application Information

V_OUT

-------------

V_IN

1 –

(EQ 4)

⎛

⎝

⎞

----------------------

------------------------------

ΔV_OUT= V_OUT

+ ESR

⎠

L × f

8 × C_OUT× f

Higher value, low cost ceramic capacitors are available in very small case sizes, and their high ripple current, high volt-

age rating, and low ESR make them ideal for switching regulator applications. Because the AS1335 control loop is not

dependant on the output capacitor ESR for stable operation, ceramic capacitors can be used to achieve very low out-

put ripple and accommodate small circuit size.

At light loads, the converter operates in powersave mode and the output voltage ripple is in direct relation to the output

capacitor and inductor value used. Larger output capacitor and inductor values minimize the voltage ripple in power-

save mode and tighten DC output accuracy in powersave mode.

Input Capacitor Selection

In continuous mode, the source current of the PMOS is a square wave of the duty cycle VOUT/VIN. To prevent large

voltage transients while minimizing the interference with other circuits caused by high input voltage spikes, a low ESR

input capacitor sized for the maximum RMS current must be used. The maximum RMS capacitor current is given as:

(EQ 5)

V_OUT× (V_IN– V_OUT

---------------------------------------------------------

)

I_RMS= I_MAX

V_IN

where the maximum average output current IMAX equals the peak current minus half the peak-to-peak ripple current,

IMAX = ILIM - ΔIL/2

This formula has a maximum at VIN = 2VOUT where IRMS = IOUT/2. This simple worst-case condition is commonly used

for design because even significant deviations only provide negligible affects.

The input capacitor can be increased without any limit for better input voltage filtering. Take care when using small

ceramic input capacitors. When a small ceramic capacitor is used at the input, and the power is being supplied through

long wires, such as from a wall adapter, a load step at the output, or VIN step on the input, can induce ringing at the VIN

pin. This ringing can then couple to the output and be mistaken as loop instability, or could even damage the part by

exceeding the maximum ratings.

Ceramic Input and Output Capacitors

When choosing ceramic capacitors for CIN and COUT, the X5R or X7R dielectric formulations are recommended.

These dielectrics have the best temperature and voltage characteristics for a given value and size. Y5V and Z5U

dielectric capacitors, aside from their wide variation in capacitance over temperature, become resistive at high frequen-

cies and therefore should not be used.

Table 4. Recommended External Components

Name

Part Number

Value

Rating

Type

Size

Manufacturer

Kemet

COUT

T520B107M006ATE040

100µF

6.3V

Tantal

(3.5x2.8x1.9mm) www.kemet.com

Murata

0805

CIN, COUT

GRM21BR60J226ME39

22µF

6.3V

X5R

www.murata.com

Coilcraft

MOS6020-222ML

MOS6020-472ML

2.2µH

4.7µH

3.26A

1.82A

35mΩ

50mΩ

6.8x6.0x2.4mm

www.coilcraft.com

Because ceramic capacitors lose a lot of their initial capacitance at their maximum rated voltage, it is recommended

that either a higher input capacity or a capacitance with a higher rated voltage is used.

www.austriamicrosystems.com

Revision 1.02

13 - 18

1...10 11 121314 15 16...18

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