DATASHEET
ISL9021A
250mA Single LDO with Low I
Q
, Low Noise and High PSRR LDO
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 5m to 400m.
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.
FN7845
Rev 3.00
December 20, 2012
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 5m to 400m
• ±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)
Related Literature
• See
FN6867,
ISL9021 “250mA Single LDO with Low IQ, Low
Noise and High PSRR LDO”
Applications
• PDAs, cell phones and smart phones
• Portable instruments, MP3 players
• Handheld devices including medical handheld
ISL9021A
VIN (1.5V TO 5.5V)
ON
ENABLE
OFF
C1
EN
GND
VIN
VO
VOUT
C2
C1, C2: 1µF X5R CERAMIC CAPACITOR
FIGURE 1. TYPICAL APPLICATION
FN7845 Rev 3.00
December 20, 2012
Page 1 of 12
ISL9021A
Block Diagram
PASS ELEMENT
VIN
VOUT
EN
TEMP
SENSOR
CONTROL
LOGIC
SHORT-CIRCUIT
PROTECTION
THERMAL PROTECTION
SOFT-START
VOLTAGE
AND
REFERENCE
GENERATOR
+
BANDGAP
GND
Pin Configurations
ISL9021A
(6 LD 1.6x1.6 µTDFN)
TOP VIEW
VIN 1
NC 2
EN 3
6
5
VO
NC
Pin Descriptions
PIN µTDFN WLCSP
NAME PIN #
PIN #
VIN
NC
GND
1
2, 5
4
3
6
-
B1
-
A2
A1
B2
-
DESCRIPTION
IC Supply/LDO Input. Connect a 1µF
capacitor to GND.
No Connect.
System ground pin.
LDO Enable. When this signal goes high,
the LDO is turned on.
LDO Output. Connect a 1µF to 4.7µF
capacitor to GND.
For µTDFN package option only. Connect it
to the system ground.
4 GND
EN
VO,
VOUT
PAD
ISL9021A
(4 BALL 0.975x1.155 WLCSP)
TOP VIEW
GND
EN
A2
A1
B2
B1
VOUT
VIN
FN7845 Rev 3.00
December 20, 2012
Page 2 of 12
ISL9021A
Ordering Information
PART NUMBER
(Notes 1, 4)
ISL9021AIINZ-T (Note 2)
ISL9021AIIUZ-T (Note 2)
ISL9021AIIMZ-T (Note 2)
ISL9021AIIKZ-T (Note 2)
ISL9021AIIFZ-T (Note 2)
ISL9021AIICZ-T (Note 2)
ISL9021AIIBZ-T (Note 2)
ISL9021AIIWZ-T (Note 2)
ISL9021AIRUNZ-T (Note 3)
ISL9021AIRUNZ-T7A (Note 3)
ISL9021AIRUMZ-T (Note 3)
ISL9021AIRUMZ-T7A (Note 3)
ISL9021AIRUKZ-T (Note 3)
ISL9021AIRUKZ-T7A (Note 3)
ISL9021AIRUJZ-T (Note 3)
ISL9021AIRUJZ-T7A (Note 3)
ISL9021AIRUFZ-T (Note 3)
ISL9021AIRUFZ-T7A (Note 3)
ISL9021AIRUCZ-T (Note 3)
ISL9021AIRUCZ-T7A (Note 3)
ISL9021AIRUBZ-T (Note 3)
ISL9021AIRUBZ-T7A (Note 3)
ISL9021AIRUWZ-T (Note 3)
ISL9021AIRUWZ-T7A (Note 3)
ISL9021AIRUYZ-T (Note 3)
ISL9021AIRUYZ-T7A (Note 3)
ISL9021AIINZ-EVZ
ISL9021AIIUZ-EVZ
ISL9021AIIMZ-EVZ
ISL9021AIIKZ-EVZ
ISL9021AIIFZ-EVZ
ISL9021AIICZ-EVZ
ISL9021AIIBZ-EVZ
ISL9021AIIWZ-EVZ
ISL9021AIRUNZ-EVZ
ISL9021AIRUMZ-EVZ
ISL9021AIRUKZ-EVZ
ISL9021AIRUJZ-EVZ
PART
MARKING
21AN
21AU
21AM
21AK
21AF
21AC
21AB
21AW
V6
V6
V5
V5
V4
V4
V3
V3
V2
V2
V1
V1
V0
V0
V7
V7
V8
V8
V
O
VOLTAGE
(V)
3.3
3.1
3.0
2.85
2.5
1.8
1.5
1.2
3.3
3.3
3.0
3.0
2.85
2.85
2.8
2.8
2.5
2.5
1.8
1.8
1.5
1.5
1.2
1.2
0.9
0.9
TEMP RANGE
(°C)
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PACKAGE
Tape & Reel
(Pb-free)
4 Ball 0.975x1.155 WLCSP
4 Ball 0.975x1.155 WLCSP
4 Ball 0.975x1.155 WLCSP
4 Ball 0.975x1.155 WLCSP
4 Ball 0.975x1.155 WLCSP
4 Ball 0.975x1.155 WLCSP
4 Ball 0.975x1.155 WLCSP
4 Ball 0.975x1.155 WLCSP
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
6 Ld µTDFN
PKG.
DWG. #
W2x2.4
W2x2.4
W2x2.4
W2x2.4
W2x2.4
W2x2.4
W2x2.4
W2x2.4
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
L6.1.6x1.6
Evaluation Board for ISL9021AIINZ
Evaluation Board for ISL9021AIIUZ
Evaluation Board for ISL9021AIIMZ
Evaluation Board for ISL9021AIIKZ
Evaluation Board for ISL9021AIIFZ
Evaluation Board for ISL9021AIICZ
Evaluation Board for ISL9021AIIBZ
Evaluation Board for ISL9021AIIWZ
Evaluation Board for ISL9021AIRUNZ
Evaluation Board for ISL9021AIRUMZ
Evaluation Board for ISL9021AIRUKZ
Evaluation Board for ISL9021AIRUJZ
FN7845 Rev 3.00
December 20, 2012
Page 3 of 12
ISL9021A
Ordering Information
(Continued)
PART NUMBER
(Notes 1, 4)
ISL9021AIRUFZ-EVZ
ISL9021AIRUCZ-EVZ
ISL9021AIRUBZ-EVZ
ISL9021AIRUWZ-EVZ
ISL9021AIRUYZ-EVZ
NOTES:
1. Please refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free WLCSP and BGA packaged products employ special Pb-free material sets; molding compounds/die attach materials and
SnAgCu - e1 solder ball terminals, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free
WLCSP and BGA packaged 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. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu plate
- e4 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.
4. For Moisture Sensitivity Level (MSL), please see device information page for
ISL9021A.
For more information on MSL please see techbrief
TB363.
PART
MARKING
V
O
VOLTAGE
(V)
TEMP RANGE
(°C)
PACKAGE
Tape & Reel
(Pb-free)
PKG.
DWG. #
Evaluation Board for ISL9021AIRUFZ
Evaluation Board for ISL9021AIRUCZ
Evaluation Board for ISL9021AIRUBZ
Evaluation Board for ISL9021AIRUWZ
Evaluation Board for ISL9021AIRUYZ
FN7845 Rev 3.00
December 20, 2012
Page 4 of 12
ISL9021A
Absolute Maximum Ratings
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6.5V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN + 0.3)V
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
4 Ball WLCSP (Note 5) . . . . . . . . . . . . . . . . .
135.64
N/A
6 Lead µTDFN (Notes 6, 7) . . . . . . . . . . . . .
230
93
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Ambient Temperature Range (T
A
) . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Supply Voltage (V
IN
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 to 5.5V
ESD Rating
Human Body Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5000V
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250V
Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2200V
Latch-Up Passed at +85°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
5.
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief
TB379.
6.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
7. For
JC
, the “case temp” location is taken at the package top center.
Electrical Specifications
PARAMETER
T
A
= -40°C to +85°C; V
IN
= (V
O
+ 0.5V) to 5.5V with a minimum V
IN
of 1.5V; C
IN
= 1µF; C
O
= 1µF. Boldface
limits apply over the operating temperature range, -40°C to +85°C.
SYMBOL
TEST CONDITIONS
MIN
(Note 10)
TYP
MAX
(Note 10)
UNIT
DC CHARACTERISTICS
Supply Voltage
V
IN
Undervoltage Lockout
Threshold
Ground Current
Shutdown Current
Output Voltage Accuracy
V
IN
V
UVLO+
V
UVLO-
I
DD
I
DDS
V
IN
Rising
V
IN
Falling
Output Enabled; I
O
= 0; V
IN
= 1.5V to 5.5V
V
IN
= 5.5V, EN = Low, I
O
= 0
V
IN
= V
O
+ 0.5V to 5.5V, I
O
= 1mA to 250mA, T
J
= +25
°
C
V
IN
= V
O
+ 0.5V to 5.5V, I
O
= 1mA to 250mA, T
J
= -40
°
C to +125
°
C
Maximum Output Current
Internal Current Limit
Dropout Voltage (Notes 8, 9)
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
I
MAX
I
LIM
V
DO
T
SD
I
O
= 250mA; V
O
> 1.8V
Continuous
-0.8
-1.8
250
260
150
160
20
250
1.3
1.5
1.425
1.375
35
0.1
50
1.0
+0.8
+1.8
5.5
1.5
V
V
V
µA
µA
%
%
mA
mA
mV
°C
°C
AC CHARACTERISTICS
Ripple Rejection (Note 8)
V
IN
= 4.5V, V
O
= 3.3V @ 1kHz
V
IN
= 4.5V, V
O
= 3.3V @ 10kHz
V
IN
= 4.5V, V
O
= 3.3V @ 1MHz
Output Noise Voltage (Note 8)
V
IN
= 4.2V, T
A
= +25
°
C, BW = 10Hz to 100kHz, I
O
= 10mA
60
75
50
8.5*V
O
dB
dB
dB
µV
RMS
DEVICE START-UP CHARACTERISTICS
Device Enable Time
LDO Soft-start Ramp Rate
t
EN
t
SSR
Time from assertion of the EN pin to when the output voltage
reaches 95% of the V
O
(nom)
Slope of linear portion of LDO output voltage ramp during start-up
250
30
600
60
µs
µs/V
FN7845 Rev 3.00
December 20, 2012
Page 5 of 12
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