FN8770 Rev 1.00 Page 1 of 13
November 10, 2016
FN8770
Rev 1.00
November 10, 2016
ISL80505
High Performance 500mA LDO
DATASHEET
The ISL80505 is a single output Low Dropout voltage regulator
(LDO) capable of sourcing up to 500mA output current. This
LDO operates from input voltages of 1.8V to 6V. The output
voltage of ISL80505 can be programmed from 0.8V to 5.5V.
A submicron BiCMOS process is utilized for this product family
to deliver the best in class analog performance and overall
value. This CMOS LDO consumes significantly lower quiescent
current as a function of load compared to bipolar LDOs, which
translates into higher efficiency and packages with smaller
footprints.
State-of-the-art internal compensation achieves a very fast
load transient response and excellent PSRR. The ISL80505
provides an output accuracy of ±1.8% V
OUT
accuracy over all
load, line and temperature variations (T
J
= -40°C to +125°C).
An external capacitor on the soft-start pin provides an
adjustable soft starting of the output voltage ramp to control
the inrush current. The ENABLE feature allows the part to be
placed into a low quiescent current shutdown mode.
Table 1 shows the differences between the ISL80505 and
others in its family.
Features
•±1.8% V
OUT
accuracy guaranteed over line, load, and
T
J
= -40°C to +125°C
• Very low 45mV dropout voltage at V
OUT
= 2.5V
• Stable with a 4.7µF output ceramic capacitor
• Very fast transient response
• Programmable output soft-start time
• Excellent PSRR over wide frequency range
• Current limit protection
•Thermal shutdown function
• Available in an 8 Ld DFN package
• Pb-free (RoHS compliant)
Applications
• Noise sensitive instrumentation systems
• Post regulation of switched mode power supplies
• Industrial systems
• Medical equipment
• Telecommunications and networking equipment
•Servers
• Hard disk drives (HD/HDD)
Related Literature
• For a full list of related documents, visit our website
- ISL80505
product page
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PART NUMBER INPUT VOLTAGE RANGE MAX OUTPUT CURRENT
ISL80510 2.2V to 6V 1.0A
ISL80505 1.8V to 6V 0.5A
FIGURE 1. TYPICAL APPLICATION CIRCUIT FIGURE 2. PSRR
V
IN
V
OUT
ISL80505
C
SS
C
OUT
(OPTIONAL)
C
IN
R
1
R
2
2
3
4
1
5
8
7
6
V
OUT
FB
GND
V
IN
V
IN
ENABLE
SS
EPAD
V
OUT
C
PB
0
10
20
30
40
50
60
70
80
100 1k 10k 100k 1M
PSRR (dB)
FREQUENCY (Hz)
V
IN
= 2.3V
V
OUT
= 1.8V
C
PB
= 2.7nF
R
1
= 10kΩ
R
2
= 3.83kΩ
C
OUT
= 10µF
I
OUT
= 0.1A
I
OUT
= 0.3A
I
OUT
= 0.5A
ISL80505
FN8770 Rev 1.00 Page 2 of 13
November 10, 2016
Ordering Information
Block Diagram
FIGURE 3. BLOCK DIAGRAM
PART NUMBER
(Notes 1
, 2, 3)
PART
MARKING
TEMP RANGE
(°C)
PACKAGE
(RoHS Compliant)
PKG
DWG. #
ISL80505IRAJZ 0505 -40 to +125 8 Ld 3x3 DFN L8.3X3J
ISL80510EVAL1Z Evaluation Board
NOTES:
1. Add “-T” suffix for 6k unit or “-T7A” suffix for 250 unit tape and reel options. Refer to TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), see device information page for ISL80505
. For more information on MSL see Technical Brief TB363.
REFERENCE
+
SOFT-START
CONTROL
LOGIC
THERMAL
SENSO R
FET DRIVER
WITH CURRENT
LIMIT
-
+
EA
V
OUT
SS
FB
-
+
E
A
ENABLE
GND
V
IN