EY1501DI-ADJ Datasheet, PDF (8/13 Pages) Altera Corporation – EY1501DI-ADJ High Performance 1A LDO

Page 8
Typical Operating Performance
Unless otherwise noted: V_IN = 2.2V, V_OUT = 1.8V, C_IN = C_OUT = 10µF, T_J = +25°C, I_L = 0A. (Continued)
10
V_IN = 2.25V
V_IN = 3.8V
V_IN (2V/DIV)
V_OUT (5mV/DIV)
TIME (200µs/DIV)
FIGURE 14. LINE TRANSIENT RESPONSE
Block Diagram
VIN
1
0.1
0.01
V_IN = 2.2V
V_OUT = 1.8V
C_OUT = 10µF
I_L = 1A
0.001
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FIGURE 15. OUTPUT NOISE SPECTRAL DENSITY
EN
CONTROL
LOGIC
-
FET DRIVER
EA
WITH CURRENT
REFERENCE
+
LIMIT
THERMAL
+
POK
SENSOR
SOFT-START
VOUT
SS
+
VFB
POK
-
GND
Applications Information
Input Voltage Requirements
EY1501DI-ADJ is capable of delivering output voltages from 0.8V to 5.0V. Due to the nature of an LDO, V_IN must be
some margin higher than V_OUT plus dropout at the maximum rated current of the application if active filtering (PSRR)
is expected from V_IN to V_OUT. The very low dropout specification allows applications to design for a level of efficiency
that can accommodate profiles smaller than the TO220/263.
EN Operation
The EN turn-on threshold is typically 800mV with 80mV of hysteresis. This pin must not be left floating, and should be
tied to V_IN if not used. A 1kΩ to 10kΩ pull-up resistor is required for applications that use open collector or open drain
outputs to control the EN pin. An internal pull-up or pull-down resistor to change these values is available upon
request. The EN pin may be connected directly to V_IN for applications with outputs that are always on.
Enpirion Power Datasheet EY1501DI-ADJ High Performance 1A LDO
10039
May 28, 2014
May 2014 Altera Corporation
Rev A