ISL80505 Datasheet, PDF (1/14 Pages) Intersil Corporation – High Performance 500mA LDO

DATASHEET
High Performance 500mA LDO
ISL80505
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 variation (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.
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
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
UG044, “ISL80510EVAL1Z Evaluation Board User Guide”
V_IN
C_IN
C_SS
V_{IN 8}
V_{IN 7}
SS ₆
ENABLE
5
ISL80505
EPAD
1 ^VOUT
2 ^VOUT
FB
3
4 ^GND
V_OUT
R₁
C_OUT
C_PB
(OPTIONAL)
R₂
FIGURE 1. TYPICAL APPLICATION CIRCUIT
80
70
60
50
40
30
20
10
0
100
I_OUT = 0.1A
I_OUT = 0.3A
I_OUT = 0.5A
1k
10k
FREQUENCY (Hz)
FIGURE 2. PSRR
V_IN = 2.3V
V_OUT = 1.8V
C_OUT = 10µF
C_PB= 2.7nF
R₁ = 10kΩ
R₂ = 3.83kΩ
100k
1M
September 8, 2015
1
FN8770.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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