ISL9008A is a high performance single low noise, high
PSRR LDO that delivers a continuous 150mA of load
current. It has a low standby current and is stable with 1μF of
MLCC output capacitance with an ESR of up to 200mΩ.
The ISL9008A has a high PSRR of 65dB and output noise
less than 45μV
. When coupled with a no load quiescent
RMS
current of 46μA (typical), and 0.5μA shutdown current, the
ISL9008A is an ideal choice for portable wireless equipment.
The ISL9008A comes in several fixed voltage options with
±1.8% output voltage accuracy over-temperature, line and
load. Other output voltage options may be available upon
request.
Pinouts
ISL9008A
(5 LD SC-70)
TOP VIEW
VIN
GND
EN
1
2
354
VO
NC
FN6300.4
Features
• High performance LDO with 150mA continuous output
• Excellent transient response to large current steps
• Excellent load regulation:
<0.1% voltage change across full range of load current
• High PSRR: 65dB @ 1kHz
• Wide input voltage capability: 2.3V to 6.5V
• Very low quiescent current: 46µA
• Low dropout voltage: typically 200mV @ 150mA
• Low output noise: typically 45µV
• Stable with 1µF to 4.7µF ceramic capacitors
• Shutdown pin turns off LDO with 1µA (max) standby
current
• Soft-start limits input current surge during enable
• Current limit and overheat protection
• ±1.8% accuracy over all operating conditions
• 5 Ld SC-70 package or 6 Ld µTDFN package
• -40°C to +85°C operating temperature range
• Pb-free (RoHS compliant)
@ 100µA (1.5V)
RMS
ISL9008A
(6 LD 1.6x1.6 µTDFN)
TOP VIEW
VO
GND
NC
1
2
3
6
5
4
VIN
NC5
EN
Applications
• PDAs, cell phones and smart phones
• Portable instruments, MP3 players
• Handheld devices including medical handhelds
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or1-888-468-3774
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
Page 2
ISL9008A
www.BDTIC.com/Intersil
Ordering Information
PART NUMBER
(Note 4)
ISL9008AIENZ-T
(Note 2)
ISL9008AIEMZ-T
(Note 2)
ISL9008AIEKZ-T
(Note 2)
ISL9008AIEJZ-T
(Note 2)
ISL9008AIEHZ-T
(Note 2)
ISL9008AIEFZ-T
(Note 2)
ISL9008AIETZ-T
(Note 2)
ISL9008AIECZ-T
(Note 2)
ISL9008AIEBZ-T
(Note 2)
ISL9008AIRUBZ-T
(Note 3)
ISL9008AIRUCZ-T
(Note 3)
ISL9008AIRUFZ-T
(Note 3)
ISL9008AIRUHZ-T
(Note 3)
ISL9008AIRUJZ-T
(Note 3)
ISL9008AIRUKZ-T
(Note 3)
ISL9008AIRUMZ-T
(Note 3)
ISL9008AIRUNZ-T
(Note 3)
NOTES:
1. For other output voltages, contact Intersil Marketing.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte
tin plate PLUS ANNEAL - e3 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.
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. Please refer to TB347 for details on reel specifications.
Ambient Temperature Range (TA) . . . . . . . . . . . . . . .-40°C to +85°C
Supply Voltage (V
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:
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
5. θ
JA
6. θ
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
7. Limits established by characterization and are not production tested.
8. VOx = 0.98*VOx(NOM); Valid for VOx greater than 1.85V.
9. Parts are 100% tested at +25°C. Temperature limits established by characterization and are not production tested.
Typical Performance Curves
(%)
O
0.8
0.6
0.4
0.2
+25°C
VO = 3.3V
I
= 0mA
LOAD
0.2
0.1
0.0
VO = 3.3V
+25°C
IO = 0mA
0.0
-0.2
-0.4
OUTPUT VOLTAGE, V
-0.6
-0.8
3.84.26.25.8
+85°C
-40°C
INPUT VOLTAGE (V)
FIGURE 1. OUTPUT VOLT AGE vs INPUT VOL T AGE
(3.3V OUTPUT)
1.0
V
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
OUTPUT VOLTAGE CHANGE (%)
-0.8
-1.0
0255075100125150175
-40°C
+25°C
LOAD CURRENT - IO (mA)
IN
V
= 3.3V
O
+85°C
= 3.8V
6.63.44.65.05.4
-0.1
-0.2
-0.3
OUTPUT VOLTAGE CHANGE (%)
-0.4
3.33.84.34.85.35.86.3
IO = 75mA
= 150mA
I
O
INPUT VOLTAGE (V)
FIGURE 2. OUTPUT VOLT AGE CHANGE (%) vs INPUT
VOLTAGE (3.3V OUTPUT)
0.10
I
= 150mA
O
VIN = 3.8V
V
OUTPUT VOLTAGE (%)
0.08
0.06
0.04
0.02
0.00
-0.02
-0.04
-0.06
-0.08
-0.10
IO = 0mA
IO = 75mA
-2502585-40
TEMPERATURE (°C)
FIGURE 3. OUTPUT VOLTAGE vs LOAD CURRENTFIGURE 4. OUTPUT VOLTAGE vs TEMPERATURE
= 3.3V
O
55
4
FN6300.4
March 11, 2008
Page 5
Typical Performance Curves (Continued)
www.BDTIC.com/Intersil
3.4
3.3
3.2
3.1
(V)
O
3.0
2.9
2.8
2.7
2.6
OUTPUT VOLTAGE, V
2.5
2.4
2.3
2.63.13.64.14.65.15.66.16.6
IO = 0mA
IO = 75mA
IO = 150mA
INPUT VOLTAGE (V)
FIGURE 5. DROPOUT VOL TAGE vs INPUT VOLTAGE
(3.3V OUTPUT)
VO = 3.3V
+25°C
ISL9008A
2.9
2.8
(V)
O
2.7
2.6
2.5
OUTPUT VOLTAGE, V
2.4
2.3
IO = 0mA
IO = 75mA
IO = 150mA
VO = 2.8V
2.53.03.54.04.55.05.56.06.5
INPUT VOLTAGE (V)
FIGURE 6. DROPOUT VOLT AG E vs INPUT VOL TAGE
(2.8V OUTPUT)
+25°C
250
200
(mV)
DO
150
VO = 2.8V
100
50
DROP OUT VOLTAGE, V
0
0255075100125150175
OUTPUT LOAD (mA)
VO = 3.3V
FIGURE 7. DROPOUT VOLTAGE vs LOAD CURRENT
90
75
60
45
30
GROUND CURRENT (µA)
15
0
1.52.03.04.04.56.05.56.5
2.53.55.0
+85°C
-40°C
INPUT VOLTAGE (V)
+25°C
V
O
IO = 0µA
= 3.3V
225
VO = 3.3V
200
175
(mV)
DO
DROP OUT VOLTAGE, V
150
125
100
75
50
25
0
2550751001251501750
OUTPUT LOAD (mA)
+85°C
-40°C
+25°C
FIGURE 8. DROPOUT VOLTAGE vs LOAD CURRENT
140
120
100
+85°C
80
60
40
GROUND CURRENT (µA)
20
0
-40°C
2550751001250
LOAD CURRENT (mA)
+25°C
= 3.8V
V
IN
VO = 3.3V
175150
FIGURE 9. GROUND CURRENT vs INPUT VOLTAGEFIGURE 10. GROUND CURRENT vs LOAD
5
FN6300.4
March 11, 2008
Page 6
Typical Performance Curves (Continued)
www.BDTIC.com/Intersil
115
105
95
IL = 150mA
ISL9008A
VIN = 5.0V
VO = 3.3V
IL = 150mA
C
= 1µF
3
L
85
75
65
GROUND CURRENT (µA)
55
45
35
-30-101040305070
IL = 75mA
IL = 0mA
-2002060-40
TEMPERATURE (°C)
FIGURE 11. GROUND CURRENT vs TEMPERATURE
4.3V
3.6V
10mV/DIV
I
LOAD
C
C
BYP
VIN = 3.8V
= 3.3V
V
O
VO = 3.3V
= 150mA
= 1μF
LOAD
= 0.01μF
80 90
VO(V)VEN (V)
4.2V
3.5V
10mV/DIV
2
1
0
5
0
100 200 300 400 500 600 700 8000
TIME (µs)
FIGURE 12. TURN ON/TURN OFF RESPONSE
I
LOAD
C
LOAD
C
BYP
900 1000
VO = 2.8V
= 150mA
= 1μF
= 0.01μF
400µs/DIV
FIGURE 13. LINE TRANSIENT RESPONSE, 3.3V OUTPUT
= 3.3V
V
O
VIN = 3.8V
I
100mA
100μA
LOAD
VO (10mV/DIV)
1.0 ms/DIV
FIGURE 14. LINE TRANSIENT RESPONSE, 2.8V OUTPUT
80
70
60
50
40
PSRR (dB)
30
20
10
0.1k1k10k100k1M
10mA
50mA
VIN = 3.9V
V
= 1.8V
O
= 1μF
C
LOAD
FREQUENCY (Hz)
FIGURE 15. LOAD TRANSIENT RESPONSEFIGURE 16. PSRR vs FREQUENCY
6
400µs/DIV
FN6300.4
March 11, 2008
Page 7
Typical Performance Curves (Continued)
www.BDTIC.com/Intersil
2.000
1.000
ISL9008A
0.100
0.010
SPECTRAL NOISE DENSITY (μV/√Hz)
0.001
VIN = 3.9V
V
= 1.8V
O
= 1µF
C
IN
= 1µF
C
LOAD
101001k10k100k1M
FREQUENCY (Hz)
100µA
10mA
FIGURE 17. SPECTRAL NOISE DENSITY vs FREQUENCY
Pin Description
5 LD SC-70
PIN NUMBER
51VOLDO Output. Connect a 1µF capacitor of value to GND
22GNDGND is the connection to system ground. Connect to PCB Ground plane.
43 and 5NCNo connect.
34ENOutput Enable. When this signal goes high, the LDO is turned on.
16VINSupply Voltage/LDO Input. Connect a 1µF capacitor to GND.
6 LD µTDFN
PIN NUMBERPIN NAMEDESCRIPTION
Typical Application
V
(2.3 TO 5V)
IN
ENABLE
OFF
ON
VOUT
C1
C2
ISL9008A
1
VIN
2
GND
3
EN
ISL9008A (µTDFN)
1
VO
2
GND
3
NC
VO
NC
VIN
NC
EN
5
4
C2
6
5
4
VIN (2.3 TO 5V)
ENABLE
C1
V
OUT
C1, C2: 1µF X5R CERAMIC CAPACITOR
ON
OFF
C1, C2: 1µF X5R CERAMIC CAPACITOR
7
FN6300.4
March 11, 2008
Page 8
Block Diagram
www.BDTIC.com/Intersil
ISL9008A
VIN
SHORT CIRCUIT,
THERMAL PROTECTION,
GND
SD
UVLO
CONTROL
LOGIC
BANDGAP AND
TEMPERATURE
SENSOR
Functional Description
The ISL9008A contains all circuitry required to implement a
high performance LDO. High performance is achieved
through a circuit that delivers fast transient response to
varying load conditions. In a quiescent condition, the
ISL9008A adjusts its biasing to achieve the lowest standby
current consumption.
The device also integrates current limit protection, smart
thermal shutdown protection, and soft-start. Smart Thermal
shutdown protects the device against overheating. Soft-start
minimizes start-up input current surges without causing
excessive device turn-on time.
Power Control
The ISL9008A has an enable pin, EN, to control power to the
LDO output. When EN is low, the device is in shutdown
mode. In this condition, all on-chip circuits are off, and the
device draws minimum current, typically less than 0.3μA.
When the EN pin goes high, the device first polls the output
of the UVLO detector to ensure that VIN voltage is at least
2.1V (typical). Once verified, the device initiates a start-up
sequence. During the start-up sequence, trim settings are
first read and latched. Then, sequentially, the bandgap,
reference voltage and current generation circuitry turn on.
Once the references are stable, the LDO powers up.
During operation, whenever the VIN voltage drops below
about 1.84V, the ISL9008A immediately disables the LDO
output. When VIN rises back above 2.1V (assuming the EN
pin is high), the device re-initiates its start-up sequence and
LDO operation resumes automatically.
SOFT-START
+
-
VOLTAGE AND
REFERENCE
GENERATOR
VO
1.0V
0.94V
0.9V
GND
Reference Generation
The reference generation circuitry includes a trimmed
bandgap, a trimmed voltage reference divider, a trimmed
current reference generator, and an RC noise filter.
The bandgap generates a zero temperature coefficient (TC)
voltage for the regulator reference and other voltage references
required for current generation and over-temperature detection.
A current generator provides references required for
adaptive biasing as well as references for LDO output
current limit and thermal shutdown determination.
LDO Regulation and Programmable Output Divider
The LDO Regulator is implemented with a high-gain
operational amplifier driving a PMOS pass transistor. The
design of the ISL9008A provides a regulator that has low
quiescent current, fast transient response, and overall
stability across all operating and load current conditions.
LDO stability is guaranteed for a 1µF to 4.7µF output
capacitor that has a toleranc e better than 2 0% and ESR less
than 200m
capacitor. Unless limited by the application, use of an output
capacitor value above 4.7µF is not recommended as LDO
performance improvement is minimal.
Soft-start circuitry integrated into each LDO limits the initial
ramp-up rate to about 30µs/V to minimize current surge. The
ISL9008A provides short-circuit protection by limiting the
output current to about 265mA (typ).
The LDO uses an independently trimmed 1V reference as its
input. An internal resistor divider drops the LDO output
voltage down to 1V. This is compar ed to the 1V refe rence for
regulation. The resistor division ratio is programmed in the
factory.
Ω. The design is performance-optimized for a 1µF
8
FN6300.4
March 11, 2008
Page 9
ISL9008A
www.BDTIC.com/Intersil
Overheat Detection
The bandgap outputs a proportional-to-temperature current
that is indicative of the temperature of the silicon. This
current is compared with references to determine if the
device is in danger of damage due to overheating. When the
die temperature reaches about +140°C, the LDO
momentarily shuts down until the die cools sufficiently. In the
overheat condition, if the LDO sources more than 50mA it
will be shut off. Once the die temperature falls back below
about +110°C, the disabled LDO is re-enabled and soft-start
automatically takes place.
6 LEAD ULTRA THIN DUAL FLAT NO-LEAD PLASTIC PACKAGE
MILLIMETERS
SYMBOL
NOTESMINNOMINALMAX
A0.450.500.55A1--0.05A30.127 REF-
A1
b0.150.200.25-
D1.551.601.654
D20.400.450.50-
E1.551.601.654
E20.951.001.05-
e0.50 BSC-
L0.250.300.35-
M
NOTES:
Rev. 1 6/06
1. Dimensions are in mm. Angles in degrees.
2. Coplanarity applies to the exposed pad as well as the terminals.
Coplanarity shall not exceed 0.08mm.
3. Warpage shall not exceed 0.10mm.
4. Package length/package width are considered as special
characteristics.
5. JEDEC Reference MO-229.
6. For additional information, to assist with the PCB Land Pattern
Design effort, see Intersil Technical Brief TB389.
0.127±0.008
0.127 +0.058
-0.008
TERMINAL THICKNESS
A1
DETAIL A
0.25
0.50
1.00
1.00
1.25
0.45
0.30
LAND PATTERN
2.00
6
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implic atio n or other wise u nde r any p a tent or patent rights of Intersil or it s sub sidi aries.
For information regarding Intersil Corporation and its products, see www.intersil.com
10
FN6300.4
March 11, 2008
Page 11
ISL9008A
www.BDTIC.com/Intersil
Small Outline Transistor Plastic Packages (SC70-5)
E
A2
A
SEATING
PLANE
D
e1
123
e
C
L
0.20 (0.008) M
PLATING
4X θ1
C
4X θ1
C
L
WITH
C
c
BASE METAL
45
C
L
b
A1
0.10 (0.004) C
b
b1
R1
L
α
L1
C
L
SEATING
PLANE
-C-
R
c1
VIEW C
GAUGE PLANE
L2
E1
P5.049
5 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE
INCHESMILLIMETERS
SYMBOL
A0.0310.0430.801.10-
A10.0000.0040.000.10-
A20.0310.0390.801.00-
b0.0060.0120.150.30-
b10.0060.0100.150.25
c0.0030.0090.080.226
c10.0030.0090.080.206
C
D0.0730.0851.852.153
E0.0710.0941.802.40-
E10.0450.0531.151.353
e0.0256 Ref0.65 Ref-
e10.0512 Ref1.30 Ref-
L0.0100.0180.260.464
L10.017 Ref.0.420 Ref.-
L20.006 BSC0.15 BSC
o
α
0
o
8
o
0
N555
R0.004-0.10-
R10.0040.0100.150.25
NOTES:
1. Dimensioning and tolerances per ASME Y14.5M-1994.
2. Package conforms to EIAJ SC70 and JEDEC MO-203AA.
3. Dimensions D and E1 are exclusive of mold flash, protrusions,
or gate burrs.
4. Footlength L measured at reference to gauge plane.
5. “N” is the number of terminal positions.
6. These Dimensions apply to the flat section of the lead between
0.08mm and 0.15mm from the lead tip.
7. Controlling dimension: MILLIMETER. Converted inch dimensions are for reference only.
o
8
NOTESMINMAXMINMAX
-
Rev. 3 7/07
VIEW C
0.4mm
0.75mm
2.1mm
0.65mm
TYPICAL RECOMMENDED LAND PATTERN
11
FN6300.4
March 11, 2008
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