Ap1635, Electrical characteristics, Pwm/pfm dual mode step-down dc/dc converter – Diodes AP1635 User Manual
Page 4

AP1635
PWM/PFM DUAL MODE STEP-DOWN DC/DC
CONVERTER
AP1635 Rev. 4
4 of 8
FEBRUARY 2009
©
Diodes Incorporated
Electrical Characteristics
V
IN
=5V, V
OUT
=2V, Load=300mA, T
A
=25°C
Symbol
Parameter
Conditions
Min
Typ.
Max
Units
V
FB
FB
0.975 1.0 1.025
V
V
IN
Input
Voltage
2.2 - 5 V
Line
Regulation V
IN
=2.2~5V, Load=10mA
-
-
0.12
%
Load
Regulation I
OUT
=10~1200mA -
-
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
- 6 -
μA
I
CL
Current
Limit
Peak current
V
IN
=5V, V
OUT
=2V
1200 1400 1600 mA
Fosc Oscillator
Frequency Load=300mA,
V
IN
=5V, V
OUT
=2V 500
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