ISL80121-5_1109 Datasheet, PDF (1/11 Pages) Intersil Corporation – 1A Ultra Low Dropout Linear Regulator with Programmable Current Limiting

1A Ultra Low Dropout Linear Regulator with
Programmable Current Limiting
ISL80121-5
The ISL80121-5 is a low dropout voltage, single output LDO with
programmable current limiting. This LDO operates from input
voltages of 2.2V to 6V. The ISL80121-5 has a nominal output
voltage of 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. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PART NUMBER
ISL80101-ADJ
PROGRAMMABLE
I_LIMIT
No
I_LIMIT
(DEFAULT)
1.75A
ADJ or FIXED
V_OUT
ADJ
ISL80101
No
1.75A
1.8V, 2.5V,
3.3V, 5.0V
ISL80101A
Yes
1.62A
ADJ
ISL80121-5
Yes
0.75A
5.0V
Features
• ±1.8% V_OUT Accuracy Guaranteed Over Line, Load and
T_J = -40°C to +125°C
• Very Low 130mV Dropout Voltage at V_IN = 5.0V
• High Accuracy Current Limit Programmable up to 1.75A
• Very Fast Transient Response
• 210µV_RMS Output Noise
• Power-Good Output
• Programmable Soft-Start
• Over-Temperature Protection
• Small 10 Ld DFN Package
Applications
• USB devices
• Telecommunications and Networking
• Medical Equipment
• Instrumentation Systems
• Routers and Switchers
• Gaming
Typical Applications
5.4V ±10%
V_IN
C_IN
10µF
ISL80121-5
10
V_IN
9
V_IN
1
V_OUT
V_OUT ²
8
I_SET
3
SENSE
ON
OFF
7
ENABLE
4
PG
6
SS _GND
C_SS
5
5.0V ±1.8%
V_OUT
C_OUT
10µF
R_PG
100kΩ
5.4V ±10%
V_IN
C_IN
10µF
R_SET
10kΩ
ON
OFF
C_SS
ISL80121-5
10
V_IN
9
V_IN
8
I_SET
1
V_OUT
V_OUT ²
SENSE ³
7
ENABLE
6
SS GND
5
4
PG
R_SENSE
10Ω
C_OUT
10µF
5.0V ±1.8%
V_OUT
R_PG
100kΩ
ILIMIT = 0.75A
(default)
September 29, 2011
1
FN7713.4
ILIMIT = 0.75 + _{R------S-----E--2---T--.--9(}----k-----_Ω------₎-
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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