CS5111

http://onsemi.com

4

Characteristic

Unit

Max

Typ

Min

Test Conditions

Switcher Section (continued)

–

1.206

1.25

1.294

V

–

1.206

1.25

1.294

V

–

–

1.0

µA

Oscillator Charge Current

35

40

45

µA

Oscillator Discharge Current

270

320

370

µA

35

40

45

µA

Switcher Max Duty Cycle

72

85

95

%

Current Sense Amp Gain

–

7.0

–

V/V

Error Amp DC Gain

–

–

67

–

dB

Error Amp Transconductance

–

–

2700

–

µA/V

ENABLE Input

VIL

–

0.8

1.24

–

V

VIH

–

–

1.3

2.0

V

Hysteresis

–

–

60

–

mV

Input Impedance

–

10

20

40

k

Ω

Select Input

4.9

0.8

1.25

–

V

4.9

–

1.25

2.0

V

SELECT Pull–Up

SELECT = 0 V

10

24

50

k

Ω

Floating Input Voltage

–

3.5

4.5

–

V

PIN FUNCTION DESCRIPTION

PACKAGE PIN #

SO–24L

PIN SYMBOL

FUNCTION

1

Supply voltage.

2, 3

NC

No connection.

4

Collector of NPN power switch for switching regulator section.

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

GND

Connected to the heat removing leads.

9

Feedback input voltage 1 (referenced to 1.25 V).

10

Feedback input voltage 2 (referenced to 1.25 V).

11

SELECT

12

COMP

Output of the transconductance error amplifier.

13

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

14

WDI

Watchdog input. Active on falling edge.

15

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

16

RESET

is reached, a reset pulse train is issued.