Owner's manual

MAX15027/MAX15028
1.425V to 3.6V Input, 1A Low-Dropout
Regulators with BIAS Input
6 _______________________________________________________________________________________
Pin Description
PIN
MAX15027 MAX15028
NAME FUNCTION
1, 2, 3 1, 2 IN
Regulator Input. 1.425V to 3.6V voltage range. Bypass to GND with at least 1µF
of ceramic capacitance. IN is high impedance when the LDO is shut down.
— 3 BIAS
Internal Circuitry Supply Input. BIAS supplies the power for the internal circuitry.
3V to 5.5V voltage range.
4 4 I.C. Internally Connected. Connect I.C. directly to GND.
55EN
LDO Enable. Drive EN high to enable the LDO or connect to IN (BIAS for
MAX15028) for always-on operation. Drive EN low to disable the LDO and place
the IC in low-power shutdown mode.
66SS
Soft-Start Input. For typical operation, connect a 0.1µF capacitor from SS to
GND. The soft-start timing is dependent on the value of this capacitor. See the
Soft-Start section.
77FB
Feedback Input. Connect FB to the center of a resistor-divider connected
between OUT and GND to set the output voltage. See the Programming the
Output Voltage section.
8 8 GND Ground
9, 10 9, 10 OUT
Regulator Output. Bypass OUT to GND with at least 4.7µF of ceramic
capacitance for 1A load operation.
——EP
Exposed Paddle. Connect EP to GND and a large copper ground plane to
facilitate package power dissipation.
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 1.8V, V
OUT
= 1.5V, I
OUT
= 1A, T
A
= +25°C, unless otherwise noted.)
OVERCURRENT THRESHOLD
vs. TEMPERATURE
MAX15027 toc13
TEMPERATURE (
°
C)
OVERCURRENT THRESHOLD (A)
400 20 10060 80-20 120
1.62
1.70
1.72
1.64
1.74
1.66
1.76
1.68
1.78
1.80
1.60
-40 140
V
BIAS
= 3.3V
CASE TEMPERATURE RISE
vs. POWER DISSIPATION
MAX15027 toc14
POWER DISSIPATION (W)
CASE TEMPERATURE RISE (°C)
10
40
50
20
60
30
70
80
0
0 2.52.01.51.00.5