1
250mA Single LDO with Low I
Q
, Low Noise and High
PSRR LDO
ISL9021A
The ISL9021A is a single LDO, which provides high
performance, low input voltage and high PSRR. It delivers
guaranteed continuous 250mA load current and is stable with
1µF to 4.7µF of output capacitance (±30%) with an ESR range
of 5mΩ to 400mΩ.
The input voltage range for the ISL9021A is between 1.5V to
5.5V and the output voltage comes in many fixed voltage
options with ±1.8% accuracy over-temperature, line and load
ranges. The ISL9021A has typical PSRR of 75dB @ 10kHz and
50dB @ 1MHz.
The reverse current protection feature prevents current from
flowing back to the power source when the output voltage is
pulled higher than the input.
The ISL9021A is offered in tiny 4-bump 0.975mmx1.155mm
WLCSP and 1.6mmx1.6mm 6 Ld µTDFN packages.
Related Literature
•See FN6867, ISL9021 “250mA Single LDO with Low IQ, Low
Noise and High PSRR LDO”
Features
• High performance LDO with 250mA guaranteed continuous
output current
• Input voltage range: 1.5V to 5.5V
• Output voltage range: 1.2V to 3.3V
• High PSRR: 75dB @ 10kHz, 50dB @ 1MHz
• Low quiescent current: 35µA
• Dropout voltage: <150mV @ 250mA
• Stable with 1µF to 4.7µF output capacitance (±30%) with an
ESR range of 5mΩ to 400mΩ
• ±1.8% output accuracy over-temperature/load/line
• Soft-start limits input current surge during enable
• Current limit and overheat protection
• -40°C to +85°C operating temperature range
• Available in 0.975mmx1.155mm 4-bump WLCSP package
and 1.6mmx1.6mm 6 Ld µTDFN
• Pb-free (RoHS compliant)
Applications
• PDAs, cell phones and smart phones
• Portable instruments, MP3 players
• Handheld devices including medical handheld
C1, C2: 1µF X5R CERAMIC CAPACITOR
ISL9021A
VIN
GND
VO
VIN (1.5V TO 5.5V)
VOUT
C1 C2
EN
ENABLE
OFF
ON
FIGURE 1. TYPICAL APPLICATION
December 20, 2012
FN7845.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|Copyright Intersil Americas Inc. 2011, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
