Rainbow Electronics MAX15030 - Manual (Page 6)

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.
5 5 EN
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.
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 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
4 µs/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