ISL80101A Datasheet, PDF (1/12 Pages) Intersil Corporation – High Performance 1A Linear Regulator with Programmable Current Limiting

High Performance 1A Linear Regulator with
Programmable Current Limiting
ISL80101A
The ISL80101A is a low dropout voltage, single output LDO
with programmable current limiting. This LDO operates from
input voltages of 2.2V to 6V, and is capable of providing output
voltages of 0.8V to 5V. Other custom voltage options are
available upon request.
A sub-micron BiCMOS process is utilized for this product family
to deliver the best in class analog performance and overall
value. The programmable current limiting improves system
reliability of end applications. An external capacitor on the
soft-start pin provides an adjustable soft-starting ramp. The
ENABLE feature allows the part to be placed into a low
quiescent current shutdown mode.
This CMOS LDO will consume significantly lower quiescent
current as a function of load compared to bipolar LDOs, which
translates into higher efficiency and packages with smaller
footprints. Quiescent current is modestly compromised to
achieve a very fast load transient response.
Table 1 shows the differences between the ISL80101A and
others in its family:
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PART NUMBER
ISL80101
I_LIMIT (DEFAULT)
1.75A
PROGRAMMABLE I_SET
No
ISL80101A
1.62A
Yes
ISL80121-5
0.75A
Yes
Features
• ±2% V_ADJ Accuracy Guaranteed Over Line, Load and
T_J = -40°C to +125°C
• Very Low 212mV Dropout Voltage at V_IN = 4.5V
• High Accuracy Current Limit Programmable up to 1.75A
• Very Fast Transient Response
• 100µV_RMS Output Noise
• Power-Good Output
• Programmable Soft-Start
• Over-Temperature Protection
• Small 10 Ld DFN Package
Applications
• Telecommunications and Networking
• Medical Equipment
• Instrumentation Systems
• USB Devices
• Gaming
• Routers and Switchers
5.0V ± 5%
10µF
C_IN
10k
R₁
R_SET
10 _VIN
9 _VIN
V_OUT ¹
V_OUT ²
100pF
C_PB
8
I_SET
3
ADJ
ISL80101A
7 _ENABLE
4
PG
0.01µF
C_SS
6 _SS
GND
5
3.3V
2.61k
R₃
10µF
C_OUT
0.464k
R₂
100k
1.5
1.2
0.9
0.6
0.3
0.0
10
V_IN = 4.5V
V_IN = 5.5V
V_IN = 5.0V
100
R_SET (kΩ)
ILIMIT
=
1.62
–
2-----.--9-----x-----(_{---2-----x----V-----I---N-------}–_------1-----)_-
RSET(kΩ)
FIGURE 1. TYPICAL APPLICATION
1000
February 24, 2011
1
FN7712.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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