1MHz Step-Down Converter/LDO Regulator
Electrical Characteristics
1
Symbol
LDO
V
OUT
V
IN
V
DO
ΔV
OUT
/
V
OUT
*ΔV
IN
ΔV
OUT(Line)
ΔV
OUT(Load)
I
OUT
I
SC
I
QLDO
I
SHDN
PSRR
T
SD
T
HYS
e
N
T
C
AAT2500
Description
Conditions
Min
Typ Max
Units
V
IN
= V
LDO
= V
OUT(NOM)
+ 1V for V
OUT
options greater than 1.5V. V
IN
= V
LDO
= 2.5V for V
OUT
≤
1.5V. I
OUT
=
1mA, C
OUT
= 2.2µF, C
IN
= 1µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are T
A
= 25°C.
T
A
= 25°C
-1.5
1.5
Output Voltage Tolerance
I
OUT
= 1mA to 300mA T
A
= -40°C
%
-2.5
2.5
to 85°C
Input Voltage
V
OUT
+V
DO
2
5.5
V
Dropout Voltage
3, 4
I
OUT
= 300mA
400 600
mV
Line Regulation
Dynamic Line Regulation
Dynamic Load Regulation
Output Current
Short-Circuit Current
LDO Quiescent Current
Shutdown Current
Power Supply Rejection Ratio
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Output Noise
Output Voltage Temperature
Coefficient
V
IN
= V
OUT
+ 1V to 5V
I
OUT
= 300mA, V
IN
= V
OUT
+ 1V to
V
OUT
+ 2V, T
R
/T
F
= 2µS
I
OUT
= 1mA to 300mA, T
R
<5µS
V
OUT
> 1.3V
V
OUT
< 0.4V
V
IN
= 5V, No Load, ENLDO = V
IN
V
IN
= 5V; ENLDO = GND,
EN = SGND = PGND
1kHz
I
OUT
= 10mA, C
BYP
= 10nF 10kHz
1MHz
2.5
60
300
600
70
125
1.0
67
47
45
145
12
e
NBW
= 300Hz to 50kHz
50
22
0.09
%/V
mV
mV
mA
mA
µA
µA
dB
°C
°C
µV
RMS
ppm/°C
1. The AAT2500 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
2. To calculate the minimum LDO input voltage, use the following equation: V
IN(MIN)
= V
OUT(MAX)
+ V
DO(MAX)
, as long as V
IN
≥
2.5V.
3. For V
OUT
<2.1V, V
DO
= 2.5 - V
OUT
.
4. V
DO
is defined as V
IN
- V
OUT
when V
OUT
is 98% of nominal.
4
2500.2006.05.1.16
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
