Rainbow Electronics MAX15028 - Manual (Page 6)

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.
5 5 EN
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.
6 6 SS
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.
7 7 FB
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)
40 0 20 100 60 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 2.5 2.0 1.5 1.0 0.5