User Manual

MAX15029/MAX15030
1.425V to 3.6V Input, 500mA Low-Dropout
Regulators with BIAS Input
6 _______________________________________________________________________________________
Pin Description
PIN
MAX15029 MAX15030
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
MAX15030) 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 2.2µF of ceramic
capacitance for 500mA load operation.
——EP
Exposed Pad. 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
= 500mA, T
A
= +25°C, unless otherwise noted.)
TURN-OFF WITH ENABLE RESPONSE
MAX15029 toc16
4µs/div
1V/div
V
OUT
V
EN
2V/div
0
0
I
OUT
= 500mA
TURN-ON WITH ENABLE RESPONSE
MAX15029 toc15
2ms/div
1V/div
V
OUT
V
EN
2V/div
0
0
I
OUT
= 500mA