
AP2004
PWM Buck Controller
Electrical Characteristics
(Continued)
(T
A
=25oC, V
CC
=6V, f=200 Khz)
Error-amplifier
Symbol
Parameter
V
IO
Input offset voltage
I
IO
Input offset current
I
IB
Input bias current
Common-mode input voltage
range
Open-loop voltage
amplification
GBW
Unity-gain bandwidth
CMRR
Common-mode rejection ratio
V
OH
Max. output voltage
V
OL
Min. output voltage
I
OI
Output (sink) current (COMP) V
ID
= -0.1V, V
O
= 1.25V
Output (source) current
(COMP)
Output section
Symbol
Parameter
Anachip Corp.
www.anachip.com.tw Rev. 0.4 Apr 6, 2004
4/8
Conditions
Min.
Typ.
160
Max.
±6
±100
500
Unit
mV
nA
nA
V
O
(FB)=1.25V
V
O
(FB)=1.25V
V
O
(FB)=1.25V
V
CM
V
CC
=3.6V ~ 20V
1.05
1.45
V
AV
R
F
=200 k
70
80
dB
1.5
80
1.6
MHz
dB
V
V
mA
60
V
ref
-0.1
1
0.5
I
OO
V
ID
= 0.1V, V
O
= 1.25V
-45
-70
μA
Conditions
Min.
Typ.
Max.
Unit
I
LEAK
Leakage current
V
O
= 25V
V
IN
= 20V
V
IN
= 20V
I
O
= 10 mA
V
O
= 6V
10
μA
Sink current
200
mA
I
DRV
Source current
200
mA
V
SAT
I
SC
Output saturation voltage
1.0
1.5
V
Short-circuit output current
120
mA
PWM comparator
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
V
T0
V
T100
CT
0.6
0.7
V
Input threshold voltage at f =
10 KHz (COMP)
Maximum duty cycle
1.2
1.3
V
Total device
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
I
CCA
Average supply current
C
T
= 270pF
6
10
mA
Soft Start
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
V
SS
I
SS
Soft-start Voltage
2.3
V
Constant Charge Current
20
μA