Diodes AP3156 Manuel d'utilisateur télécharger pdf (Page 5)

AP3156

HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP

FOR WHITE LED APPLICATIONS

AP3156 Rev. 1 5 of 15 SEPTEMBER 2009

www.diodes.com © Diodes Incorporated

Electrical Characteristics

= C

OUT

= C

= 1.0µF; T

= 25°C, V

= 3.5V. Unless otherwise noted.

Symbol Paramete

Test Conditions Min Typ. Max Unit

Quiescent Current

1X Mode, 3.0

≤V

≤5.5, Active,

No Load Current

0.3 1

1.5X Mode, 3.0≤V

≤5.5, Active,

No Load Current

2.0 3

2X Mode, 3.0≤V

≤5.5, Active,

No Load Current

1.5 3

50µA Setting, 1X Mode 50 µA

SHDN

Shutdown Current SDI = 0 1 µA

SINK

Current Accuracy

(Note 4)

SET

= 20mA (Note 5), T

= 25°C

18.6 20 21.4 mA

SET

= 4mA (Note 5), T

= 25°C

3.6 4 4.4 mA

D-Match

Current Matching Between Any

Two Current Sink Inputs

(Note 6)

D1:D6 = 3.6V

0.5 %

1X to 1.5X or 1.5X to 2X

Transition Threshold at Any

SINK

SET

= 25mA 150 mV

Charge Pump Section

Soft-Start Time 40 µs

CLK

Clock Frequency

0.5/

MHz

SDI

(

)

SDI Threshold Low V

= 2.7V 0.4 V

SDI

(

)

SDI Threshold High V

= 5.5V 1.4 V

SLO

SDI Low Time 0.3 50 µs

SHI

SDI High Time 0.05 50 µs

OFF

SDI Off Timeout 256 µs

SEP

SDI Valid Sequence Timeout 256 µs

SDI

SDI Input Leakage -1 1 µA

Thermal Resistance

Junction-to-Ambient

QFN4040-16 (Note 7) 46

C/W

Notes: 4. Determined by the average current levels of all active channels

5. Sequence setting set to give nominal 20mA max output current and 4mA output current.

6. Defined as the deviation of any sink current from the average of all active current channels

7. Device mounted on FR-4 substrate, 2"*2", 2oz, copper, double-sided PC board,

1 2 3 4 5 6 7 8 9 10 ... 14 15

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Diodes AP3156 Manuel d'utilisateur Page 5

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