AP2008
PWM BUCK CONTROLLER
AP2008 Rev. 2 4 of 8 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Electrical Characteristics (T
A
=25ºC, V
CC
=6V, f=200 Khz)
Reference (REF)
Symbol Parameter Conditions Min Typ. Max Unit
V
REF
Comp connect to FB 0.755 0.770 0.785 V
Output voltage change with
temperature
T
A
= -20ºC ~ 25ºC -0.1 ±1 %
T
A
= 25ºC ~ 85ºC -0.2 ±1 %
Under voltage lockout (UVLO)
Symbol Parameter Conditions Min Typ. Max Unit
V
UT
Upper threshold voltage (V
CC
)
I
O(REF)
= 0.1mA
T
A
= 25ºC
2.9 V
V
LWT
Lower threshold voltage (V
CC
) 2.4 V
V
HT
Hysteresis (V
CC
) 500 mV
Short-circuit protection (SCP) control
Symbol Parameter Conditions Min Typ. Max Unit
V
IT
Input threshold voltage T
A
= 25ºC 0.60 0.67 0.75 V
V
STB
Standby voltage No pull up 100 130 160 mV
V
LT
Latched input voltage No pull up 50 100 mV
I
SCP
Input (source) current V
I
= 0.7V, T
A
= 25ºC -10 -15 -20 µA
V
CT
Comparator threshold voltage
(COMP)
1.5 V
Oscillator (OSC)
Symbol Parameter Conditions Min Typ. Max Unit
F
OSC
Frequency C
T
=270 pF 200 KHz
ΔF
OSC
Standard deviation of frequency C
T
=270 pF 10
%
Frequency change with voltage V
CC
=3.6V ~ 20V 1
Error-amplifier
Symbol
Parameter Conditions Min Typ. Max Unit
V
IO
Input offset voltage V
O
(FB)=0.77V ±6 mV
I
IO
Input offset current V
O
(FB)=0.77V ±100 nA
I
IB
Input bias current V
O
(FB)=0.77V 160 500 nA
V
CM
Common-mode input voltage range V
CC
=3.6V ~ 20V 1.05 1.45 V
AV Open-loop voltage amplification R
F
=200 kΩ 70 80 dB
GBW Unity-gain bandwidth 1.5 MHz
CMRR Common-mode rejection ratio 60 80 dB
V
OH
Max. output voltage V
ref
-0.1 V
V
OL
Min. output voltage 1 V
I
OI
Output (sink) current (COMP) V
ID
= -0.1V, V
O
= 0.77V 0.5 1.6 mA
I
OO
Output (source) current (COMP) V
ID
= 0.1V, V
O
= 0.77V -45 -70 µA
