Datasheet > CS1937

CS1937

更新时间： 2022-10-19 22:37:25

品牌	Logo	应用领域
SAMES		电子驱动手机便携式
页数	文件大小	规格书
6页	209K
描述
CS1937ES5是DC/DC升压型白光LED驱动IC,可以替代多种型号:LT1937,AIC1896,RT9271,LM2703,CP2126,MP3205,AT1308X等.广泛应用于手机、MP3等便携式电子设备。

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CS1937 数据手册

CS1937

Pin Function

Pin 1(SW):

Switch pin. Connect inductor and diode here. Minimize trace area at this pin to reduce

EMI.

Pin 2(GND):

Ground pin. Connect this pin to local ground plane directly.

Pin 3(FB):

Feedback pin. Reference voltage is 95mV. Connect cathode of lowest LED and

resistor here. Calculate resistor value according to following formula:

RFB=95mV/ILED

Pin 4(SHDN):

Shutdown pin. Connect 1.5V or higher to enable device; 0.4V or less to disable device.

Pin 5(GND for SOT23-6):

Ground pin. Connect to Pin 2 and to local ground plane.

Pin 5(Vin for SOT23-5):

Pin 6(Vin for SOT23-6):

Input supply pin. Must be locally bypassed.

Board Layout Consideration

As we know, for all switching regulators, we should pay attention to PCB board layout

and component placement. To maximize efficiency, switching rise/fall time should be

made as short as possible. To prevent EMI issue, proper layout of the high frequency

switching path is essential. The signal of the SW pin has sharp rise/fall edges.

Minimize the length and area of all traces connected to SW pin and always use a

ground plane under the switching regulator to minimize interplane coupling. In addition,

the ground connection for the feedback resistor R1 should be tied to GND pin directly

and not shared with any other component. Recommended component placement is

shown in following figure.

1 2 345 6

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