CS5112 datasheet(4/13 Pages) ONSEMI

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CS5112

http://onsemi.com

ELECTRICAL CHARACTERISTICS (5.0 V

≤ VIN ≤ 26 V and −40°C ≤ TJ ≤ 150°C, COUT = 100 mF (ESR ≤ 8.0 W), CDelay = 0.1 mF,

RBIAS = 64.9 kW, COSC = 390 pF, CCOMP = 0.1 mF; unless otherwise specified.)

Characteristic

Unit

Max

Typ

Min

Test Conditions

Switcher Section (continued)

Switcher Max Duty Cycle

VSW = 5.0 V with 50 W Load, VFB1 = VFB2 = 1.0 V

Current Sense Amp Gain

ISW = 2.3 A

−

7.0

−

V/V

Error Amp DC Gain

−

Error Amp Transconductance

−

2700

−

mA/V

ENABLE Input

VIL

−

0.8

1.24

−

VIH

−

1.3

2.0

Hysteresis

−

Input Impedance

−

Select Input

VIL (Selects VFB1)

4.9

≤ VLIN ≤ 5.1

0.8

1.25

−

VIH (Selects VFB2)

4.9

≤ VLIN ≤ 5.1

−

1.25

2.0

SELECT Pullup

SELECT = 0 V

Floating Input Voltage

−

3.5

4.5

−

PIN FUNCTION DESCRIPTION

PACKAGE PIN #

SOIC−24

PIN SYMBOL

FUNCTION

VIN

Supply voltage.

2, 3

No connection.

VSW

Collector of NPN power switch for switching regulator section.

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

GND

Connected to the heat removing leads.

VFB1

Feedback input voltage 1 (referenced to 1.25 V).

VFB2

Feedback input voltage 2 (referenced to 1.25 V).

SELECT

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

to select VFB1.

COMP

Output of the transconductance error amplifier.

COSC

A capacitor connected to GND sets the switching frequency. Refer to Figure 5.

WDI

Watchdog input. Active on falling edge.

CDelay

A capacitor connected to GND sets the Power On Reset and Watchdog time.

RESET

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

reached, a reset pulse train is issued.

IBIAS

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

charge currents.

VLIN

Regulated 5.0 V output from the linear regulator section.

VREG

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

ENABLE

Logic level input to shut down the switching regulator.

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