User guide

MAX8902A/MAX8902B
Low-Noise 500mA LDO Regulators
in a 2mm x 2mm TDFN Package
4 _______________________________________________________________________________________
Typical Operating Characteristics
(MAX8902A, V
IN
= 3.6V, V
OUT
= 2.5V, T
A
= +25°C, unless otherwise noted.)
0
40
20
80
60
120
100
140
023145
QUIESCENT CURRENT
EN = HIGH, NO LOAD
MAX8902A/02B toc01
INPUT VOLTAGE (V)
INPUT CURRENT (μA)
2.500
2.502
2.501
2.504
2.503
2.505
2.506
0200100 300 400 500
LOAD REGULATION
MAX8902A/02B toc02
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
3.6V INPUT
2.490
2.496
2.494
2.492
2.498
2.500
2.502
2.504
2.506
2.508
2.510
1.5 2.5 3.5 4.5 5.5
LINE REGULATION
MAX8902A/02B toc03
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
200mA LOAD
40ms/div
LOAD TRANSIENT RESPONSE
50mA TO 500mA TO 50mA
V
OUT
100mV/div
200mA/div
MAX8902A/02B toc04
I
OUT
t
RISE
= t
FALL
= 1
μ
s
10μs/div
LOAD TRANSIENT RESPONSE
V
IN
2V/div
2mV/div
MAX8902A/02B toc05
V
OUT
2.5V OUTPUT
5Ω LOAD
5V
4V
5V
100μs/div
STARTUP WAVEFORM
V
EN
500mV/div
2V/div
200mA/div
MAX8902A/02B toc06
I
IN
V
OUT
5Ω LOAD
C
BYP
= 0.01μF
0
10
20
30
40
50
60
70
80
0 100 200 300 400 500
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8902A/02B toc07
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
3.6V INPUT, 4.6V OUTPUT PRESET
THE SLOPE OF THE LINE INDICATES
A 129mΩ ON-RESISTANCE IN
DROPOUT
PSRR vs. FREQUENCY
MAX8902A/02B toc08
10k1k10010 100k
FREQUENCY (Hz)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
PSRR (dB)
MAX8902A LDO OUTPUT-NOISE SPECTRAL
DENSITY vs. FREQUENCY
MAX8902A/02B toc09
FREQUENCY (Hz)
100k10k1k100
100E+0
1E+3
10E+3
10E+0
10 1M
NOISE DENSITY (nV √Hz)