Linear Technology LT1761 Manual

DESCRIPTIO
Demonstration circuit DC330 comprises two low noise
micropower voltage regulators using the LT
5-lead SOT-23 package. These circuits are primarily used
in cellular phones, voltage controlled oscillators, RF power
PERFORmANCE SU
(JP1 or JP3 set on pins 1 and 2), unless otherwise specified.
PARAMETER
Input Voltage Range
Output Voltage (Note 1)
Output Voltage (Note 1)
Output Voltage (Note 1)
Output Voltage (Note 1)
Output Voltage (Note 1)
Output Voltage (Note 1)
Output Voltage (Note 1)
Output Voltage (Note 1)
Line Regulation
Quiescent Current
Load Regulation
SHDN Pin Threshold (LT1761-SD)
Output Voltage Noise (LT1761-BYP)
Note 1: Output voltage variations include ±1% tolerance of feedback divider network. For tighter voltage range,
use lower tolerance resistors or use fixed voltage output devices.
TYPICAL PERFORM
Typical Dropout Voltage
500
450
400
350
T
J
300
250
T
J
200
150
100
50
0
10 20 30 40 50 60 70 80 90 100
0
OUTPUT CURRENT (mA)
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ARY
CONDITIONS
V = 2.8V, JP1 or JP3 on Pins 5 and 6
IN
V = 3V, JP1 or JP3 on Pins 7 and 8
IN
V = 3.5V, JP1 or JP3 on Pins 9 and 10
IN
V = 3.8V, JP1 or JP3 on Pins 11 and 12
IN
V = 4V, JP1 or JP3 on Pins 13 and 14
IN
V = 4.3V, JP1 or JP3 on Pins 15 and 16
IN
V = 5V, JP1 or JP3 on Pins 17 and 18
IN
∆V
= 2.3V to 20V
IN
I = 0mA
LOAD
∆I
= 1mA to 100mA
LOAD
On-to-Off
Off-to-On, I
I = 100mA, BW = 10Hz to 100kHz
LOAD
ANCE CHARACTERISTICS AND BOARD PHOTO
= 125°C
V
OUT
100µV/DIV
= 25°C
1761 G00
LT1761 100mA Low Noise
Micropower LDO Regulators
supplies and as local regulators in larger systems. Their
®
1761 in the ability to tolerate a wide variety of output capacitors makes
them ideal in space- and cost-sensitive systems.
, LTC and LT are registered trademarks of Linear Technology Corporation.
T = 25°C, V = 2.3V, V
A IN SHDN
= 100mA
LOAD
LT1761-BYP (5V Output)
10Hz to 100Hz Output Noise
I = 100mA
1ms/DIV
L
DEMO MANUAL DC330
LOW DROPOUT REGULATOR
= 5V, I = 1mA, V = 1.22V
LOAD OUT
MIN TYP
2.3
1.205 1.220
1.764 1.802
1.954 1.999
2.455 2.506
2.742 2.817
2.936 3.019
3.207 3.300
4.848 5.006
1
20
0.2
0.45 0.65
0.8
20
DC330 Board Photo
MAX UNITS
20 V
1.235 V
1.839 V
2.044 V
2.571 V
2.894 V
3.103 V
3.396 V
5.167 V
5 mV
µA
35
1 %
V
1.8 V
µV
RMS
DC330 BP
1