CS5111 Datasheet PDF ( Pinout ) - 1.4A Switching Regulator

CS5111 Datasheet PDF - ON Semiconductor

Part Number	*CS5111*
Description	1.4A Switching Regulator
Manufacturers	ON Semiconductor
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CS5111

1.4 A Switching Regulator

with 5.0 V, 100 mA Linear

Regulator with Watchdog,

RESET and ENABLE

The CS5111 is a dual output power supply integrated circuit. It

contains a 5.0 V ± 2%, 100 mA linear regulator, a watchdog timer, a

linear output voltage monitor to provide a Power On Reset (POR) and

a 1.4 A current mode PWM switching regulator.

The 5.0 V linear regulator is comprised of an error amplifier, reference,

and supervisory functions. It has low internal supply current consumption

and provides 1.2 V (typical) dropout voltage at maximum load current.

The watchdog timer circuitry monitors an input signal (WDI) from

the microprocessor. It responds to the falling edge of this watchdog

signal. If a correct watchdog signal is not received within the

externally programmable time, a reset signal is issued.

The externally programmable active reset circuit operates correctly

for an output voltage (VLIN) as low as 1.0 V. During power up, or if the

output voltage shifts below the regulation limit, RESET toggles low

and remains low for the duration of the delay after proper output

voltage regulation is restored. Additionally a reset pulse is issued if the

correct watchdog is not received within the programmed time. Reset

pulses continue until the correct watchdog signal is received. The reset

pulse width and frequency, as well as the Power On Reset delay, are set

by one external RC network.

The current mode PWM switching regulator is comprised of an

error amplifier with selectable feedback inputs, a current sense

amplifier, an adjustable oscillator, and a 1.4 A output power switch

with anti–saturation control. The switching regulator can be

configured in a variety of topologies.

The CS5111 is load dump capable and has protection circuitry

which includes overvoltage shutdown, current limit on the linear and

switcher outputs, and an overtemperature limiter.

Features

• Linear Regulator

– 5.0 V ± 2% @ 100 mA

• Switching Regulator

– 1.4 A Peak Internal Switch

– 120 kHz Maximum Switching Frequency

– 5.0 V to 26 V Operating Supply Range

• Smart Functions

– Watchdog

– RESET

– ENABLE

• Protection

– Overvoltage

– Overtemperature

– Current Limit

• 54 V Peak Transient Capability

• Internally Fused Leads in SO–24L Package

January, 2001 – Rev. 9

http://onsemi.com

SO–24L

DWF SUFFIX

CASE 751E

MARKING

DIAGRAM

CS5111

AWLYYWW

A = Assembly Location

WL, L = Wafer Lot

YY, Y = Year

WW, W = Work Week

PIN CONNECTIONS

VIN

VSW

GND

VFB1

VFB2

SELECT

COMP

ENABLE

VREG

VLIN

IBIAS

GND

RESET

CDelay

WDI

COSC

ORDERING INFORMATION

Device

Package

Shipping

CS5111YDWF24

SO–24L 31 Units/Rail

CS5111YDWFR24 SO–24L 1000 Tape & Reel

Publication Order Number:

CS5111/D

CS5111

PIN FUNCTION DESCRIPTION (continued)

PACKAGE PIN #

SO–24L

PIN SYMBOL

21 IBIAS

22 VLIN

23 VREG

24 ENABLE

FUNCTION

A resistor connected to GND sets internal bias currents as well as the COSC and

CDelay charge currents.

Regulated 5.0 V output from the linear regulator section.

Input voltage to the linear regulator and the internal supply circuitry.

Logic level input to shut down the switching regulator.

TYPICAL PERFORMANCE CHARACTERISTICS

4.5 0

–10

4.0 –20

–30

3.5

20 40 60 80 100

ILIN (mA)

Figure 2. 5.0 V Regulator Bias Current vs. Load Current

–40

0.5 1.0 1.5

ISW (A)

2.0

Figure 3. Supply Current vs. Switch Current

1.4 180

1.2 160

140

1.0

120

0.8 100

0.6 80

0.4

0.2 20

0 0.5 1.0 1.5 2.0

ISW (A)

Figure 4. Switch Saturation Voltage

0 500 1000 1500 2000 2500 3000

COSC (pF)

Figure 5. Oscillator Frequency (kHz) vs.

COSC (pF), Assuming RBIAS = 64.9 kW

http://onsemi.com

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CS5111 Datasheet PDF - ON Semiconductor

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