DATASHEET

ISL9008
NS
DESIG
W
E
N
PART
F OR
NDED ACEM ENT
E
M
M
L
ECO
RE P
Datasheet
NO T R MENDED
08A
M
O
ISL90
REC
®
March 11, 2008
FN9235.1
Low Noise LDO with Low IQ and High
PSRR
Features
ISL9008 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.
• Excellent Transient Response to Large Current Steps
• High Performance LDO With 150mA Continuous Output
The ISL9008 has a high PSRR of 65dB and output noise
less than 45µVRMS. When coupled with a no load quiescent
current of 45µA (typical), and 0.5µA shutdown current, the
ISL9008 is an ideal choice for portable wireless equipment.
The ISL9008 comes in several fixed voltage options with
±1.8% output voltage accuracy over temperature, line and
load. Other output voltage options are available on request.
• 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: 45µA
• Low Dropout Voltage: Typically 200mV @ 150mA
• Low Output Noise: Typically 45µVrms @ 100µA (1.5V)
• Stable With 1µF to 4.7µF Ceramic Capacitors
Pinout
• Shutdown Pin Turns Off LDO With 1µA (max) Standby
Current
ISL9008
(5 LD SC-70)
TOP VIEW
VIN
1
GND
2
EN
3
5
• Soft-Start Limits Input Current Surge During Enable
VO
• Current Limit and Overheat Protection
• ±1.8% Accuracy Over All Operating Conditions
• 5 Ld SC-70 Package
4
NC
• -40°C to +85°C Operating Temperature Range
• Pb-Free (RoHS compliant)
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 or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2006-2008. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
ISL9008
Ordering Information
PART NUMBER
(Notes 1, 2)
PART MARKING
VO VOLTAGE
(Note 3)
TEMP. RANGE (°C)
PACKAGE
(Pb-Free)
TAPE AND REEL
PACKAGE
DRAWING
ISL9008IENZ -T
CBB
3.3V
-40 to +85
5 Ld SC-70 Tape and Reel
P5.049
ISL9008IEMZ -T
CAY
3.0V
-40 to +85
5 Ld SC-70 Tape and Reel
P5.049
ISL9008IEKZ -T
CAW
2.85V
-40 to +85
5 Ld SC-70 Tape and Reel
P5.049
ISL9008IEJZ -T
CAV
2.8V
-40 to +85
5 Ld SC-70 Tape and Reel
P5.049
ISL9008IEHZ -T
CAT
2.75V
-40 to +85
5 Ld SC-70 Tape and Reel
P5.049
ISL9008IEFZ -T
CAS
2.5V
-40 to +85
5 Ld SC-70 Tape and Reel
P5.049
ISL9008IECZ -T
CAR
1.8V
-40 to +85
5 Ld SC-70 Tape and Reel
P5.049
ISL9008IEBZ -T
CAP
1.5V
-40 to +85
5 Ld SC-70 Tape and Reel
P5.049
NOTES:
1. Please refer to TB347 for details on reel specifications
2. For other output voltages, contact Intersil Marketing.
3. 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.
2
FN9235.1
March 11, 2008
ISL9008
Absolute Maximum Ratings
Thermal Information
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7.1V
VO Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.6V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VIN + 0.3V)
Thermal Resistance (Note 4)
Recommended Operating Conditions
Ambient Temperature Range (TA) . . . . . . . . . . . . . . .-40°C to +85°C
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 to 6.5V
θJA (°C/W)
5 Ld SC-70 Package . . . . . . . . . . . . . . . . . . . . . . . .
565
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
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.
NOTE:
4. θJA 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.
5. Limits established by characterization and are not production tested.
Electrical Specifications
PARAMETER
Unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature
range of the device as follows:
TA = -40°C to +85°C; VIN = (VO +0.5V) to 6.5V with a minimum VIN of 2.3V; CIN = 1µF; CO = 1µF
SYMBOL
TEST CONDITIONS
MIN
(Note 7
MAX
(Note 7)
UNITS
6.5
V
45
65
µA
TYP
DC CHARACTERISTICS
Supply Voltage
VIN
Ground Current
IDD
2.3
Quiescent condition: IO = 0µA
Shutdown Current
IDDS
0.5
1.2
µA
UVLO Threshold
VUV+
1.9
2.1
2.3
V
VUV-
1.6
1.8
2.0
V
Regulation Voltage Accuracy
Maximum Output Current
IMAX
Internal Current Limit
ILIM
Drop-out Voltage (Note 6)
Thermal Shutdown Temperature
Initial accuracy at VIN = VO + 0.5V, IO = 10mA, TJ = +25°C
-0.7
+0.7
%
VIN = VO + 0.5V to 6.5V, IO = 10µA to150mA, TJ =+ 25°C
-0.8
+0.8
%
VIN = VO + 0.5V to 6.5V, IO = 10µA to 150mA, TJ = -40°C to
+125°C
-1.8
+1.8
%
Continuous
150
175
mA
265
355
mA
VDO1
IO = 150mA; VO < 2.5V
300
500
mV
VDO2
IO = 150mA; 2.5V ≤ VO ≤ 2.8V
250
400
mV
VDO3
IO = 150mA; 2.8V < VO
200
325
mV
TSD+
140
°C
TSD-
110
°C
@ 1kHz
65
dB
@ 10kHz
45
dB
@ 100kHz
35
dB
BW = 10Hz to 100kHz, IO = 100µA
45
µVRMS
BW = 10Hz to 100kHz, IO = 10mA
65
µVRMS
AC CHARACTERISTICS
Ripple Rejection (Note 6)
IO = 10mA, VIN = 2.8V(min), VO = 1.8V
Output Noise Voltage (Note 6)
VO = 1.5V, TA = +25°C
DEVICE START-UP CHARACTERISTICS
Device Enable tIme
tEN
3
Time from assertion of the ENx pin to when the output voltage
reaches 95% of the VO(nom)
250
500
µs
FN9235.1
March 11, 2008
ISL9008
Electrical Specifications
PARAMETER
Unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature
range of the device as follows:
TA = -40°C to +85°C; VIN = (VO +0.5V) to 6.5V with a minimum VIN of 2.3V; CIN = 1µF; CO = 1µF (Continued)
MIN
(Note 7
SYMBOL
TEST CONDITIONS
tSSR
Slope of linear portion of LDO output voltage ramp during start-up
LDO Soft-start Ramp Rate
TYP
MAX
(Note 7)
UNITS
30
60
µs/V
EN PIN CHARACTERISTICS
Input Low Voltage
VIL
-0.3
0.4
V
Input High Voltage
VIH
1.4
VIN + 0.3
V
0.1
µA
Input Leakage Current
IIL, IIH
Pin Capacitance
CPIN
Informative
5
pF
NOTES:
6. VOx = 0.98*VOx(NOM); Valid for VOx greater than 1.85V
7. Parts are 100% tested at +25°C. Temperature limits established by characterization and are not production tested.
Typical Performance Curves
0.8
0.2
OUTPUT VOLTAGE CHANGE (%)
0.6
OUTPUT VOLTAGE, VO (%)
VO = 3.3V
+25°C
VO = 3.3V
ILOAD = 0mA
0.4
0.2
+25°C
0.0
+85°C
-0.2
-0.4
-40°C
-0.6
3.8
4.2
4.6
5.0
5.4
5.8
6.2
IO = 0mA
0.0
-0.1
IO = 75mA
IO = 150mA
-0.2
-0.3
-0.4
3.3
-0.8
3.4
0.1
6.6
3.8
INPUT VOLTAGE (V)
5.3
5.8
6.3
FIGURE 2. OUTPUT VOLTAGE CHANGE (%) vs INPUT
VOLTAGE (3.3V OUTPUT)
0.10
1.0
VIN = 3.8V
VO = 3.3V
0.6
0.06
0.4
0.2
-40°C
0.0
+25°C
-0.2
-0.4
+85°C
0.04
0.00
IO = 150mA
-0.04
-0.8
-0.08
50
75
100
125
LOAD CURRENT - IO (mA)
150
FIGURE 3. OUTPUT VOLTAGE vs LOAD CURRENT
4
175
IO = 75mA
-0.02
-0.06
25
IO = 0mA
0.02
-0.6
0
VIN = 3.8V
VO = 3.3V
0.08
OUTPUT VOLTAGE (%)
0.8
OUTPUT VOLTAGE CHANGE (%)
4.8
INPUT VOLTAGE (V)
FIGURE 1. OUTPUT VOLTAGE vs INPUT VOLTAGE
(3.3V OUTPUT)
-1.0
4.3
-0.10
-40
-25
0
25
55
85
TEMPERATURE (°C)
FIGURE 4. OUTPUT VOLTAGE vs TEMPERATURE
FN9235.1
March 11, 2008
ISL9008
Typical Performance Curves (Continued)
2.9
3.4
3.3
2.8
OUTPUT VOLTAGE, VO (V)
OUTPUT VOLTAGE, VO (V)
3.2
VO = 3.3V
+25°C
3.1
3.0
IO = 0mA
2.9
IO = 75mA
2.8
IO = 150mA
2.7
2.6
2.5
2.7
IO = 0mA
2.6
IO = 75mA
IO = 150mA
2.5
VO = 2.8V
+25°C
2.4
2.4
2.3
2.3
2.6
3.1
3.6
4.1
4.6
5.1
INPUT VOLTAGE (V)
5.6
6.1
2.5
6.6
3.5
4.0
4.5
5.0
5.5
6.0
6.5
INPUT VOLTAGE (V)
FIGURE 6. DROPOUT VOLTAGE vs INPUT VOLTAGE
(2.8V OUTPUT)
FIGURE 5. DROPOUT VOLTAGE vs INPUT VOLTAGE
(3.3V OUTPUT)
225
250
VO = 3.3V
DROP OUT VOLTAGE, VDO (mV)
200
DROP OUT VOLTAGE, VDO (mV)
3.0
200
150
VO = 2.8V
VO = 3.3V
100
50
+25°C
175
+85°C
150
125
-40°C
100
75
50
25
0
0
25
50
75
100
125
150
0
175
0
25
50
FIGURE 7. DROPOUT VOLTAGE vs LOAD CURRENT
125
150
175
140
120
GROUND CURRENT (µA)
75
GROUND CURRENT (µA)
100
FIGURE 8. DROPOUT VOLTAGE vs LOAD CURRENT
90
+85°C
60
45
+25°C
30
-40°C
15
-40°C
100
+25°C
80
+85°C
60
40
VIN = 3.8V
VO = 3.3V
20
VO = 3.3V
IO = 0µA
0
1.5
75
OUTPUT LOAD (mA)
OUTPUT LOAD (mA)
0
2.0
2.5
3.0
4.0
3.5
4.5
5.0
5.5
6.0
INPUT VOLTAGE (V)
FIGURE 9. GROUND CURRENT vs INPUT VOLTAGE
5
6.5
0
25
50
75
100
125
150
175
LOAD CURRENT (mA)
FIGURE 10. GROUND CURRENT vs LOAD
FN9235.1
March 11, 2008
ISL9008
Typical Performance Curves (Continued)
115
IL = 150mA
3
85
2
VO(V)
95
IL = 75mA
75
VIN = 3.8V
VO = 3.3V
65
55
45
IL = 0mA
35
-40 -30 -20 -10
0
10 20 30 40 50
TEMPERATURE (°C)
60
70
80
VIN = 5.0V
VO = 3.3V
IL = 150mA
CL = 1µF
1
0
VEN (V)
GROUND CURRENT (µA)
105
5
0
0
90
100
200
300
400
500
600
700
800
900 1000
TIME (µs)
FIGURE 11. GROUND CURRENT vs TEMPERATURE
FIGURE 12. TURN ON/TURN OFF RESPONSE
VO = 3.3V
ILOAD = 150mA
VO = 2.8V
ILOAD = 150mA
CLOAD = 1µF
CBYP = 0.01µF
CLOAD = 1µF
CBYP = 0.01µF
4.3V
4.2V
3.6V
3.5V
10mV/DIV
10mV/DIV
400µs/DIV
400µs/DIV
FIGURE 13. LINE TRANSIENT RESPONSE, 3.3V OUTPUT
FIGURE 14. LINE TRANSIENT RESPONSE, 2.8V OUTPUT
80
10mA
70
VO = 3.3V
VIN = 3.8V
PSRR (dB)
ILOAD
100mA
60
50
40
30
100µA
VO (10mV/DIV)
50mA
20
VIN = 3.9V
VO = 1.8V
CBYP = 0.1µF
CLoad = 1µF
10
0.1k
1.0 ms/DIV
FIGURE 15. LOAD TRANSIENT RESPONSE
6
1k
10k
100k
1M
FREQUENCY (Hz)
FIGURE 16. PSRR vs FREQUENCY
FN9235.1
March 11, 2008
ISL9008
Typical Performance Curves (Continued)
2.0
SPECTRAL NOISE DENSITY (µV/√Hz)
1.0
10mA
0.1
0.01
VIN = 3.9V
VO = 1.8V
CBYP = 0.1µF
100µA
CIN = 1µF
CLOAD = 1µF
0.001
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
FIGURE 17. SPECTRAL NOISE DENSITY vs FREQUENCY
Pin Description
PIN
NUMBER
PIN
NAME
1
VIN
Supply Voltage/LDO Input:
Connect a 1µF capacitor to GND.
2
GND
GND is the connection to system ground. Connect to PCB Ground plane.
3
EN
Output Enable. When this signal goes high, the LDO is turned on.
4
NC
No Connect
5
VO
LDO Output:
Connect a 1µF capacitor of value to GND
DESCRIPTION
Typical Application
ISL9008
5
1
VIN (2.3 TO 5V)
VIN
VOUT
VO
2
GND
ON
3
ENABLE
OFF
C1
EN
4
NC
C2
C1, C2: 1µF X5R CERAMIC CAPACITOR
C3: 0.1µF X5R CERAMIC CAPACITOR
7
FN9235.1
March 11, 2008
ISL9008
Block Diagram
VIN
VO
UVLO
CONTROL
LOGIC
SHORT CIRCUIT,
THERMAL PROTECTION,
SOFT-START
GND
+
-
SD
BANDGAP AND
TEMPERATURE
SENSOR
VOLTAGE AND
REFERENCE
GENERATOR
1.0V
0.94V
0.9V
GND
8
FN9235.1
March 11, 2008
ISL9008
Functional Description
The ISL9008 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
ISL9008 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 ISL9008 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 ISL9008 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.
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 ISL9008 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 tolerance better than 20% and ESR less
than 200mΩ. The design is performance-optimized for a 1µF
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
ISL9008 provides short-circuit protection by limiting the
output current to about 200mA (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 compared to the 1V reference for regulation.
The resistor division ratio is programmed in the factory.
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.
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 implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
9
FN9235.1
March 11, 2008
ISL9008
Small Outline Transistor Plastic Packages (SC70-5)
P5.049
D
VIEW C
e1
5 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE
INCHES
5
SYMBOL
4
E
CL
1
2
CL
3
e
E1
b
CL
0.20 (0.008) M
C
C
CL
A
A2
SEATING
PLANE
A1
-C-
PLATING
b1
0.043
0.80
1.10
-
0.004
0.00
0.10
-
A2
0.031
0.039
0.80
1.00
-
b
0.006
0.012
0.15
0.30
-
b1
0.006
0.010
0.15
0.25
c
0.003
0.009
0.08
0.22
6
c1
0.003
0.009
0.08
0.20
6
D
0.073
0.085
1.85
2.15
3
E
0.071
0.094
1.80
2.40
-
E1
0.045
0.053
1.15
1.35
3
e
0.0256 Ref
0.65 Ref
-
e1
0.0512 Ref
1.30 Ref
-
L2
c1
NOTES
0.031
0.010
0.018
0.017 Ref.
0.26
0.46
4
0.420 Ref.
0.006 BSC
0o
N
c
MAX
0.000
α
WITH
MIN
A
L
b
MILLIMETERS
MAX
A1
L1
0.10 (0.004) C
MIN
-
0.15 BSC
8o
0o
5
8o
-
5
5
R
0.004
-
0.10
-
R1
0.004
0.010
0.15
0.25
Rev. 3 7/07
NOTES:
BASE METAL
1. Dimensioning and tolerances per ASME Y14.5M-1994.
2. Package conforms to EIAJ SC70 and JEDEC MO-203AA.
4X θ1
3. Dimensions D and E1 are exclusive of mold flash, protrusions,
or gate burrs.
R1
4. Footlength L measured at reference to gauge plane.
5. “N” is the number of terminal positions.
R
GAUGE PLANE
SEATING
PLANE
L
C
L1
α
L2
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.
4X θ1
VIEW C
0.4mm
0.75mm
2.1mm
0.65mm
TYPICAL RECOMMENDED LAND PATTERN
10
FN9235.1
March 11, 2008
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