Diodes AP1604 Manuel d'utilisateur télécharger pdf (Page 3)

AP1604A

PWM/PFM DUAL MODE STEP-DOWN DC/DC

CONVERTER

AP1604A Rev. 2 3 of 7 FEBRUARY 2009

www.diodes.com © Diodes Incorporated

Absolute Maximum Ratings (T

A

=25°C)

Symbol Parameter Ratings Units

V

CC

/SV

CC

V

IN

Pin Voltage -0.3 ~ 6.5 V

V

OUT

V

OUT

Pin Voltage -0.3 ~ V

IN

+0.3 V

V

FB

FB Pin Voltage -0.3 ~ V

IN

+0.3 V

V

CE/SS

CE/SS Pin Voltage -0.3 ~ V

IN

+0.3 V

P

D

Continuous Total Power Dissipation Internal limited

T

OP

Operating Ambient Temperature -25 ~ +80 °C

T

ST

Storage Temperature Range -40 ~ +125 °C

Electrical Characteristics

V

IN

= 5V, V

OUT

＝2V, Load = 300mA, TA = 25°C

Sym. Parameter Conditions Min Typ. Max Units

V

FB

FB 0.975 1.0 1.025 V

V

IN

Input Voltage 2.2 - 5.5 V

Line Regulation V

IN

= 2.2 ~ 5.5V, Load = 10mA - - 0.12 %

Load Regulation I

OUT

= 10 ~ 800mA - - 1.2 %

V

UVLO

UVLO Voltage（min.

operating voltage）

V

CC

, voltage required to maintain H at

V

OUT

- - 2 V

I

CC

Operating Current CE/SS = V

IN

,No Load - 100 150 μA

I

CCQ

Supply Current

No external components,

CE/SS = V

IN

,V

FB

= 1.2V

- 90 120 μA

I

STB

Stand-by Current

No external components,

CE/SS = 0V,V

FB

= 0V

- 2 - μA

I

CL

Current Limit

peak current

V

IN

= 5V, V

OUT

= 2V

800 1000 1200 mA

Fosc Oscillator Frequency Load = 300mA, V

IN

= 5V, V

OUT

= 2V 500 600 700 kHz

MAXDTY Maximum Duty Ratio 85 90 - %

PFMDTY PFM Duty Ratio No load 15 25 35 %

V

CEH

CE/SS ”High” Voltage

Apply 1.4V (min.) to CE/SS, determine

V

OUT

”High”

1.4 - - V

V

CEL

CE/SS ”Low” Voltage Same as V

CEH

, determine V

OUT

/”Low” - - 0.6 V

EFFI Efficiency V

CC

= 5V, V

OUT

= 3.3V, Load = 300mA - 93 - %

Rdson Rdson Condition I

OUT

= 300mA, V

IN

= 5V, V

OUT

= 2V - 350 450 mΩ

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