CS5111 데이터 시트보기 (PDF) - Cherry semiconductor

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CS5111

14.1A switching regulator with 5V,100mA linear regulator with watchdog,reset and enable

Cherry semiconductor 

PACKAGE LEAD #

24 Lead SO Wide

1

2, 3

4

5,6,7,8,17,18,19,20

9

10

11

12

13

14

15

16

21

22

23

24

Package Lead Description

LEAD SYMBOL

FUNCTION

VIN

NC

VSW

Gnd

VFB1

VFB2

SELECT

COMP

COSC

WDI

CDelay

RESET

IBIAS

VLIN

VREG

ENABLE

Supply Voltage.

No connection.

Collector of NPN power switch for switching regulator section.

Connected to the heat removing leads.

Feedback input voltage 1 (referenced to 1.25V)

Feedback input voltage 2 (referenced to 1.25V)

Logic level input that selects either VFB1 or VFB2. An open selects

VFB2. Connect to Gnd to select VFB1.

Output of the transconductance error amplifier.

A capacitor connected to Gnd sets the switching frequency.

Refer to Figure 1d.

Watchdog input. Active on falling edge.

A capacitor connected to Gnd sets the Power On Reset and

Watchdog time.

RESET output. Active low if VLIN is below the regulation limit.

If watchdog timeout is reached, a reset pulse train is issued.

A resistor connected to Gnd sets internal bias currents as well as

the COSC and CDelay charge currents.

Regulated 5V output from the linear regulator section.

Input voltage to the linear regulator and the internal supply cir-

cuitry.

Logic level input to shut down the switching regulator.

Typical Performance Characteristics

4.5mA

0A

4.0mA

-10mA

-20mA

3.5mA

0A

20mA 40mA

60mA 80mA

ILIN

Figure 1a. 5V Regulator Bias Current vs. Load Current.

100mA

1.4V

1.2V

1.0V

0.8V

0.6V

0.4V

0.2V

0.0V

0A

0.5A

1.0A

ISW

1.5A

2.0A

Figure 1c. Switch Saturation Voltage.

-30mA

-40mA

0A

0.5A

1.0A

ISW

1.5A

2.0A

Figure 1b. Supply Current vs. Switch Current.

180

160

140

120

100

80

60

40

20

0

0

500 1000 1500 2000 2500 3000

COSC (pF)

Figure 1d. Oscillator Frequency (kHz) vs. COSC (pF), assuming RBIAS =

64.9kΩ.

4

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