Datasheet

MAX6469–MAX6484
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
_______________________________________________________________________________________ 5
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX6469 toc04
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
25020015010050
25
50
75
100
125
0
0 300
V
OUT
= 3.3V
C
OUT
= 3.3
µ
F
PSRR vs. FREQUENCY
MAX6469 toc05
FREQUENCY (kHz)
PSRR (dB)
1001010.1
-50
-40
-30
-20
-10
0
-60
0.01 1000
V
OUT
= 3.3V
C
OUT
= 3.3
µ
F
I
LOAD
= 30mA
REGION OF STABLE C
OUT
ESR
vs. LOAD CURRENT
MAX6469 toc06
LOAD CURRENT (mA)
C
OUT
ESR (Ω)
25020015010050
1
2
3
4
5
0
0300
C
OUT
= 4.7
µ
F
C
OUT
= 3.3
µ
F
STABLE REGION
OUTPUT NOISE
MAX6469 toc07
500µs/div
100µV/div
V
IN
= 4.5V
V
OUT
= 3.3V
I
LOAD
= 100mA
100
0
10 100 10k 100k
OUTPUT NOISE vs. FREQUENCY
20
40
80
60
MAX6469 toc08
FREQUENCY (Hz)
V
RMS
(µV)
1k
V
IN
= 2.5V
V
OUT
= 1.5V
I
OUT
= 100mA
SHUTDOWN RESPONSE
MAX6469 toc09
20ms/div
V
OUT
2V/div
V
SHDN
5V/div
I
LOAD
= 50mA
STARTUP RESPONSE
MAX6469 toc10
10µs/div
V
IN
2V/div
V
OUT
2V/div
MAX6469 toc11
100µs/div
V
OUT
20mV/div
LOAD-TRANSIENT RESPONSE
V
IN
= 5V
V
OUT
= 3.3V
I
LOAD
= 10mA TO 300mA
MAX6469 toc12
10µs/div
V
IN
= 5V
V
OUT
= 3.3V
I
LOAD
= 100mA
V
OUT
5mV/div
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
Typical Operating Characteristics (continued)
(V
IN
= 5V, V
OUT
= 3.3V, C
OUT
= 3.3µF, T
A
= +25°C, unless otherwise noted.)