Diodes AP1604 - Manual (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, T
A = 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 m Ω