AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
AP1121 Rev. 5 4 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Absolute Maximum Ratings
Symbol Parameter Rating Unit
V
IN
DC Supply Voltage -0.3 to 18 V V
T
ST
Storage Temperature -65 to +150
o
C
T
OP
Operating Junction Temperature Range 0 to +125
o
C
T
M
Maximum Junction Temperature 150
o
C
Electrical Characteristics (Under Operating Conditions)
Paramete
Conditions Min Typ. Max Unit
Output Voltage
AP1121_ - V
OUT1
I
OUT
= 10mA, T
A
= 25
o
C,
4.8V≤V
IN
≤12V
3.235 3.300 3.365 V
AP1121A - V
OUT2
I
OUT
= 10mA, T
A
= 25
o
C,
4V
V
IN
12V
2.450 2.500 2.550 V
AP1121B - V
OUT2
I
OUT
= 10mA, T
A
= 25
o
C,
4V≤V
IN
≤12V
1.764 1.800 1.836 V
Line Regulation I
O
= 10mA, V
OUT
+1.5V<V
IN
<12V, T
A
= 25
o
C 0.2 %
Load Regulation
AP1121 series
V
OUT1
V
IN
= 5V, 0≤I
OUT
≤1A,
T
A
= 25
o
C (Note 3, 4)
26 33 mV
AP1121 series
V
OUT2
V
IN
= 4V, 0mA<Io<1A,
T
A
= 25
o
C (Note 4, 5)
20 25 mV
Dropout Voltage
(V
IN
-V
OUT
)
I
OUT
= 1A, ΔV
OUT
= 0.1%V
OUT
1.3 1.4 V
Current Limit (V
IN
-V
OUT
) = 5V 1. 1 A
Minimum Load Current
0
o
C≤Tj≤125
o
C (Note 5)
5 10 mA
Thermal Regulation T
A
= 25
o
C, 30ms pulse 0.008 0.04 %/W
Ripple Rejection F = 120Hz, C
OUT
= 25uF Tantalum, I
OUT
= 1A 60 70 dB
Temperature Stability I
O
= 10mA 0.5 %
JA
Thermal Resistance
Junction-to-Ambient (No
heat sink; No air flow)
SOP-8L: Control Circuitry/Power Transistor
(Note 6)
CH1 or CH2 only
CH1 & CH2 and PD1 = PD2
177
158
O
C/W
JC
θ
Thermal Resistance
Junction-to-Case
SOP-8L: Control Circuitry/Power Transistor
(Note 6)
CH1 or CH2 only
CH1 & CH2 and PD1 = PD2
29
19
O
C/W
Notes: 3. See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant
junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead = 1/18” from the package.
4. Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the input/output
differentially and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.
5. Quiescent current is defined as the minimum output current that requires maintaining regulation. At 12V input/output differential the device is
guaranteed to regulate if the output current is greater than 10mA.
6. Vout1 and Vout2 are connected to the PCB copper area 5.5mm*5.5mm separately. If you need large PD or lower Tc & Tj, please connect to
the large copper area >> 5.5mm*5.5mm (like 10mm*10mm).
