ZXLD1322 datasheet(5/17 Pages) DIODES

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ZXLD1322

Document number: DS32166 Rev. 3 - 2

5 of 17

www.diodes.com

April 2010

A Product Line of

Diodes Incorporated

Electrical Characteristics (Test conditions: VIN = 4V, TAMB = 25°C unless otherwise stated

(a)

)

DC-DC Converter Supply Parameters

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

VIN

Supply Voltage

Normal Operation

2.5

VIN(Start)

Supply voltage for start-up(b)

Start-up mode

1.2

2.4

VUV-

Under-voltage detection threshold

normal operation to start-up mode

VIN falling

1.8

VUV+

Under-voltage detection threshold

start-up mode to normal operation

VIN rising

2.2

Quiescent Current

Measured into VIN ADJ pin floating.

Excluding switch base current).

1.5

ISTBY

Standby Current

Measured into VIN. ADJ pin grounded

µA

VREF

Internal Reference Voltage

ADJ pin floating

2.5V<VIN<15V

480

500

520

TCO(REF)

Internal Reference Temperature

Coefficient

ppm/K

Notes:

(a) Production testing of the device is performed at 25°C. Functional operation of the device and parameters specified from -40°C to +125°C are

guaranteed by design, characterization and process control.

(b) Between 1.2V and 2.2V the device will run in the Low Voltage Startup Mode (for details refer to section "Low Voltage Operation")

DC-DC Converter Input Parameters

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

VSENSE

Peak switch current sense voltage

Measured on ISENSE pin CFB pin

at 0V

VSENSE

(SU)

Peak switch current sense voltage in

start-up mode

Measured on ISENSE pin. Start-up

mode VIN = 1.2V

10.5

ISENSE

Sense input current

Measured into ISENSE with pin at

0V. CFB pin at 0V

-15

-7

-1

µA

CFB

Control loop compensation capacitor

VADJ

External DC control voltage applied to

ADJ pin to adjust output current

DC brightness control mode

500

VADJ(th)

Switching threshold of ADJ pin

Standby state to normal operation

TCO

(VADJ)

Temperature coefficient of VADJ(th)

+0.3

%/K

RADJ

Internal resistor between VREF and

ADJ

VADJ<550mV

100

Ω

VADJ

(CLMP)

Clamp voltage on ADJ pin

100

μA injected into ADJ pin

575

DC-DC Converter Output Parameters

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

Toff(100)

Discharge pulse width

100% Output current

0.7

1.2

1.7

µs

Toff(10)

Discharge pulse width

10% Output current

µs

fLXMAX

Maximum operating frequency

600

KHz

fSU

Switching frequency in start-up mode

VIN = 1.2V

KHz

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