AAT2500M
400mA Step-Down Converter and 300mA LDO
Electrical Characteristics
1
V
IN_BUCK
= V
IN_LDO
= 5.0V. T
A
= -40°C to +85°C unless noted otherwise. Typical values are at T
A
= +25°C.
Symbol
Description
Conditions
Min
Typ
Max
Units
Power Supply
V
INBUCK
,
Input Voltage
V
INLDO
V
UVLO
I
Q
Under-Voltage Lockout
V
IN
Rising
V
IN
Falling
V
EN
= V
IN
, No Load
V
EN
= GND
No Load, T
A
= 25°C
I
OUT
= 0 to 400mA; V
IN
= 2.7 to 5.5V
V
IN
= 5.5V, V
LX
= 0 to V
IN
, V
EN
= GND
V
FB
= 1.0 V
2.7
5.5
2.7
2.35
130
1.0
V
V
V
µA
µA
V
%
µA
µA
A
Ω
Ω
%
%
MHz
µs
V
%
V
mA
A
mV
%
%
µs
V
V
µA
°C
°C
Quiescent Current
I
SHDN
Shutdown Current
Step-Down Converter
Feedback Voltage Tolerance
`
I
LXLEAK
LX Reverse Leakage Current
I
FB
Feedback Leakage
I
LIM
P-Channel Current Limit
R
DS(ON)H
High Side Switch On Resistance
R
DS(ON)L
Low Side Switch On Resistance
∆V
OUT
/V
OUT
Load Regulation
∆V
OUT
/V
OUT
Line Regulation
F
OSC
Oscillator Frequency
T
S
Start-Up Time
LDO (V
OUT
= 3.3V)
V
OUT
Output Voltage Tolerance
V
OUT
Output Voltage Range
V
IN
Input Voltage
V
FB
0.591
-3
-1.0
1.2
0.4
0.25
0.25
0.3
1.8
120
3.24
-3
V
OUT
+
V
DO
2
300
3.30
0.609
+3
1.0
0.2
I
LOAD
= 0 to 400mA
V
IN
= 2.7V to 5.5V
From Enable to Output Regulation
No Load, 25°C
I
OUT
= 0 to 300mA
3.36
3
5.5
I
OUT
Output Current
I
LIM
Current Limit
V
DO
Dropout Voltage
3
∆V
OUT
/V
OUT
Load Regulation
∆V
OUT
/V
OUT
Line Regulation
T
S
Start-Up Time
Logic Signals
V
EN(L)
Enable Threshold Low
V
EN(H)
Enable Threshold High
I
EN(H)
Enable Current Consumption
Over-Temperature Shutdown
T
SD
Threshold
Over-Temperature Shutdown
T
HYS
Hysteresis
I
OUT
= 300mA
I
LOAD
= 0 to 300mA
V
IN
= 3.7V to 5.5V
From Enable to Output Regulation
1
160
1.2
0.6
100
240
0.6
1.5
-1.0
150
15
1.0
1. Specification over the -40°C to +85°C operating temperature ranges is assured by design, characterization and correlation with sta-
tistical process controls.
2. To calculate the minimum LDO input voltage, use the following equation: V
IN(MIN)
= V
OUT(MAX)
+ V
DO(MAX)
.
3. V
DO
is defined as V
IN
- V
OUT
when V
OUT
is 98% of nominal.
4
2500M.2007.06.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
