ABSOLUTE MAXIMUM RATINGS

(Voltages to GND unless otherwise stated)

30V

500mA

Power dissipation (PD)

300mW

-40 to 85°C

-55 to 150°C

125°C

ZXLD1615

SEMICO NDUC TORS

ISSUE 3 - AUGUST 2004

2

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Input voltage

2.5

5.5

V

Supply current

Quiescent

Shutdown

60

<10

100

100

µA

nA

FB pin control voltage

0.98

1.07

V

Operating frequency

600

kHz

LX output ‘OFF’ time

350

500

ns

(2)

LX output ‘ON’ time

5µs

Switch peak current limit

320

mA

Switch 'On' resistance

1.75

Switch leakage current

1

µA

EN pin high level Input voltage Device active

1.5

V

EN pin low level Input voltage

Device in shutdown

0.4

V

EN pin low level input current

-100

nA

1

A

(3)

EN pin turn off delay

120

µs

T/T

PWM duty cycle range at

‘EN’ input for dc output

voltage control

20

100

%

Internal PWM low pass filter

cut-off frequency

4

kHz

Filter attenuation

f=30kHz

52.5

dB

(1)

)

NOTES:

1 Production testing of the device is performed at 25°C. Functional operation of the device over a –40°C to +85°C temperature range is

guaranteed by design, characterization and process control.

3 This is the time for which the device remains active after the EN pin has been asserted low. This delay is necessary to allow the output to be

maintained during dc PWM mode operation.

4 The maximum PWM signal frequency during this mode of operation should be kept as low as possible to minimize errors due to the turn-off

delay