ISL9008IENZ-T [INTERSIL]
Low Noise LDO with Low IQ and High PSRR;
| 型号： | ISL9008IENZ-T |
| 厂家： | 
Intersil |
| 描述： | Low Noise LDO with Low IQ and High PSRR |
| 文件： | 总10页 (文件大小：181K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ISL9008
®
et
March 11, 2008
FN9235.1
Low Noise LDO with Low I and High
Q
PSRR
Features
• High Performance LDO With 150mA Continuous Output
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
• Excellent Load Regulation:
< 0.1% Voltage Change Across Full Range of Load
Current
The ISL9008 has a high PSRR of 65dB and output noise
• High PSRR: 65dB @ 1kHz
less than 45µV
. When coupled with a no load quiescent
RMS
• Wide Input Voltage Capability: 2.3V to 6.5V
• Very Low Quiescent Current: 45µA
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.
• 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
• 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
VO
NC
VIN
GND
EN
1
2
3
5
4
• -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
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.
1
All other trademarks mentioned are the property of their respective owners.
ISL9008
Ordering Information
PACKAGE
(Pb-Free)
TAPE AND REEL
PART NUMBER
(Notes 1, 2)
VO VOLTAGE
PACKAGE
DRAWING
PART MARKING
(Note 3)
TEMP. RANGE (°C)
-40 to +85
ISL9008IENZ -T
CBB
CAY
CAW
CAV
CAT
CAS
CAR
CAP
3.3V
5 Ld SC-70 Tape and Reel
5 Ld SC-70 Tape and Reel
5 Ld SC-70 Tape and Reel
5 Ld SC-70 Tape and Reel
5 Ld SC-70 Tape and Reel
5 Ld SC-70 Tape and Reel
5 Ld SC-70 Tape and Reel
5 Ld SC-70 Tape and Reel
P5.049
ISL9008IEMZ -T
ISL9008IEKZ -T
ISL9008IEJZ -T
ISL9008IEHZ -T
ISL9008IEFZ -T
ISL9008IECZ -T
ISL9008IEBZ -T
NOTES:
3.0V
-40 to +85
P5.049
P5.049
P5.049
P5.049
P5.049
P5.049
P5.049
2.85V
2.8V
-40 to +85
-40 to +85
2.75V
2.5V
-40 to +85
-40 to +85
1.8V
-40 to +85
1.5V
-40 to +85
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.
FN9235.1
March 11, 2008
2
ISL9008
Absolute Maximum Ratings
Thermal Information
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7.1V
Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.6V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VIN + 0.3V)
Thermal Resistance (Note 4)
θ
(°C/W)
565
JA
V
O
5 Ld SC-70 Package . . . . . . . . . . . . . . . . . . . . . . . .
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 ) . . . . . . . . . . . . . . .-40°C to +85°C
A
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 to 6.5V
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. θ is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
JA
Tech Brief TB379.
5. Limits established by characterization and are not production tested.
Electrical Specifications Unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature
range of the device as follows:
T
= -40°C to +85°C; V = (V +0.5V) to 6.5V with a minimum V of 2.3V; C = 1µF; C = 1µF
IN IN IN
A
O
O
MIN
MAX
PARAMETER
DC CHARACTERISTICS
Supply Voltage
SYMBOL
TEST CONDITIONS
(Note 7 TYP (Note 7) UNITS
V
2.3
6.5
65
V
µA
µA
V
IN
Ground Current
I
Quiescent condition: I = 0µA
45
0.5
2.1
1.8
DD
O
Shutdown Current
UVLO Threshold
I
1.2
DDS
V
1.9
1.6
2.3
UV+
V
2.0
V
UV-
Regulation Voltage Accuracy
Initial accuracy at V = V + 0.5V, I = 10mA, T = +25°C
IN
-0.7
-0.8
-1.8
+0.7
+0.8
+1.8
%
%
%
O
O
J
V
= V + 0.5V to 6.5V, I = 10µA to150mA, T =+ 25°C
O O J
IN
V
= V + 0.5V to 6.5V, I = 10µA to 150mA, T = -40°C to
IN
O
O
J
+125°C
Maximum Output Current
Internal Current Limit
I
Continuous
150
175
mA
mA
mV
mV
mV
°C
MAX
I
V
V
V
T
265
300
250
200
140
110
355
500
400
325
LIM
Drop-out Voltage (Note 6)
I
I
I
= 150mA; V < 2.5V
O
DO1
DO2
DO3
SD+
O
O
O
= 150mA; 2.5V ≤ V ≤ 2.8V
O
= 150mA; 2.8V < V
O
Thermal Shutdown Temperature
T
°C
SD-
AC CHARACTERISTICS
Ripple Rejection (Note 6)
I
= 10mA, V = 2.8V(min), V = 1.8V
IN
O
O
@ 1kHz
65
45
35
dB
dB
dB
@ 10kHz
@ 100kHz
Output Noise Voltage (Note 6)
V = 1.5V, T = +25°C
O A
BW = 10Hz to 100kHz, I = 100µA
45
65
µV
O
RMS
RMS
BW = 10Hz to 100kHz, I = 10mA
µV
O
DEVICE START-UP CHARACTERISTICS
Device Enable tIme
t
Time from assertion of the ENx pin to when the output voltage
reaches 95% of the VO(nom)
250
500
µs
EN
FN9235.1
March 11, 2008
3
ISL9008
Electrical Specifications Unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature
range of the device as follows:
T
= -40°C to +85°C; V = (V +0.5V) to 6.5V with a minimum V of 2.3V; C = 1µF; C = 1µF (Continued)
IN IN IN
A
O
O
MIN
MAX
PARAMETER
LDO Soft-start Ramp Rate
EN PIN CHARACTERISTICS
Input Low Voltage
SYMBOL
TEST CONDITIONS
Slope of linear portion of LDO output voltage ramp during start-up
(Note 7 TYP (Note 7) UNITS
t
30
60
µs/V
SSR
V
-0.3
1.4
0.4
V
V
IL
Input High Voltage
V
V
+ 0.3
IH
IN
Input Leakage Current
Pin Capacitance
I , I
IL IH
0.1
µA
pF
C
Informative
5
PIN
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
VO = 3.3V
+25°C
V
I
= 3.3V
O
= 0mA
0.6
0.4
LOAD
0.1
0.0
I
= 0mA
O
0.2
+25°C
0.0
-0.1
-0.2
-0.3
-0.4
I
= 75mA
O
+85°C
-0.2
-0.4
-0.6
-0.8
I
= 150mA
O
-40°C
3.3
3.8
4.3
4.8
5.3
5.8
6.3
3.4
3.8
4.2
4.6
5.0
5.4
5.8
6.2
6.6
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
FIGURE 2. OUTPUT VOLTAGE CHANGE (%) vs INPUT
VOLTAGE (3.3V OUTPUT)
FIGURE 1. OUTPUT VOLTAGE vs INPUT VOLTAGE
(3.3V OUTPUT)
0.10
1.0
V
V
= 3.8V
= 3.3V
IN
O
V
V
= 3.8V
= 3.3V
0.08
0.06
0.04
0.02
0.00
-0.02
-0.04
-0.06
0.8
0.6
IN
O
0.4
I
= 0mA
O
0.2
-40°C
I
= 75mA
O
0.0
+25°C
+85°C
-0.2
-0.4
-0.6
-0.8
-1.0
I
= 150mA
O
-0.08
-0.10
-40
-25
0
25
55
85
0
25
50
75
100
125
150
175
TEMPERATURE (°C)
LOAD CURRENT - I (mA)
O
FIGURE 4. OUTPUT VOLTAGE vs TEMPERATURE
FIGURE 3. OUTPUT VOLTAGE vs LOAD CURRENT
FN9235.1
March 11, 2008
4
ISL9008
Typical Performance Curves (Continued)
2.9
2.8
2.7
2.6
2.5
2.4
2.3
3.4
3.3
3.2
V
= 3.3V
O
3.1
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
+25°C
I
= 0mA
O
I
= 0mA
O
I
= 75mA
O
I
= 75mA
O
I
= 150mA
O
I
= 150mA
O
V
= 2.8V
O
+25°C
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
2.6
3.1
3.6
4.1
4.6
5.1
5.6
6.1
6.6
INPUT VOLTAGE (V)
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
200
150
VO = 3.3V
200
+25°C
175
150
125
100
75
+85°C
-40°C
V
= 2.8V
O
V
= 3.3V
O
100
50
0
50
25
0
0
25
50
75
100
125
150
175
0
25
50
75
100
125
150
175
OUTPUT LOAD (mA)
OUTPUT LOAD (mA)
FIGURE 7. DROPOUT VOLTAGE vs LOAD CURRENT
FIGURE 8. DROPOUT VOLTAGE vs LOAD CURRENT
140
90
120
100
80
60
40
20
0
75
60
45
30
15
0
-40°C
+25°C
+85°C
+85°C
+25°C
-40°C
V
V
= 3.8V
= 3.3V
IN
V
I
= 3.3V
= 0µA
O
O
O
0
25
50
75
100
125
150
175
1.5
2.0
2.5
3.0
3.5
4.0 4.5
5.0
5.5
6.0
6.5
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
FIGURE 10. GROUND CURRENT vs LOAD
FIGURE 9. GROUND CURRENT vs INPUT VOLTAGE
FN9235.1
March 11, 2008
5
ISL9008
Typical Performance Curves (Continued)
115
IL = 150mA
105
95
85
75
65
55
45
35
V
V
= 5.0V
= 3.3V
= 150mA
IN
O
3
2
1
0
5
0
I
L
C
= 1µF
L
IL = 75mA
V
V
= 3.8V
= 3.3V
IN
O
IL = 0mA
0
100 200 300 400 500 600 700 800 900 1000
TIME (µs)
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
TEMPERATURE (°C)
FIGURE 11. GROUND CURRENT vs TEMPERATURE
FIGURE 12. TURN ON/TURN OFF RESPONSE
V
I
= 3.3V
V
I
= 2.8V
O
O
= 150mA
= 150mA
LOAD
LOAD
C
C
= 1µF
= 0.01µF
C
C
= 1µF
= 0.01µF
LOAD
LOAD
BYP
BYP
4.3V
3.6V
4.2V
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
V
= 3.3V
= 3.8V
O
V
IN
60
50mA
I
50
40
30
LOAD
100mA
100µA
V
V
= 3.9V
= 1.8V
IN
O
C
= 0.1µF
20
10
BYP
VO (10mV/DIV)
1.0 ms/DIV
C
= 1µF
Load
0.1k
1k
10k
100k
1M
FREQUENCY (Hz)
FIGURE 16. PSRR vs FREQUENCY
FIGURE 15. LOAD TRANSIENT RESPONSE
FN9235.1
March 11, 2008
6
ISL9008
Typical Performance Curves (Continued)
2.0
1.0
10mA
0.1
V
V
= 3.9V
= 1.8V
IN
O
100µA
0.01
C
C
C
= 0.1µF
BYP
= 1µF
IN
LOAD
= 1µF
100
0.001
10
1k
10k
100k
1M
FREQUENCY (Hz)
FIGURE 17. SPECTRAL NOISE DENSITY vs FREQUENCY
Pin Description
PIN
PIN
NUMBER
NAME
DESCRIPTION
1
VIN
Supply Voltage/LDO Input:
Connect a 1µF capacitor to GND.
2
3
4
5
GND
EN
GND is the connection to system ground. Connect to PCB Ground plane.
Output Enable. When this signal goes high, the LDO is turned on.
No Connect
NC
VO
LDO Output:
Connect a 1µF capacitor of value to GND
Typical Application
ISL9008
5
4
1
2
3
VIN (2.3 TO 5V)
VOUT
VIN
VO
NC
GND
EN
ON
ENABLE
OFF
C1
C2
C1, C2: 1µF X5R CERAMIC CAPACITOR
C3: 0.1µF X5R CERAMIC CAPACITOR
FN9235.1
March 11, 2008
7
ISL9008
Block Diagram
VIN
VO
SHORT CIRCUIT,
THERMAL PROTECTION,
SOFT-START
CONTROL
LOGIC
UVLO
GND
SD
+
-
1.0V
0.94V
0.9V
BANDGAP AND
TEMPERATURE
SENSOR
VOLTAGE AND
REFERENCE
GENERATOR
GND
FN9235.1
March 11, 2008
8
ISL9008
references required for current generation and
over-temperature detection.
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.
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.
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.
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.
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.
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.
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
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
FN9235.1
March 11, 2008
9
ISL9008
Small Outline Transistor Plastic Packages (SC70-5)
D
P5.049
VIEW C
5 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE
INCHES MILLIMETERS
MIN
e1
SYMBOL
MAX
0.043
0.004
0.039
0.012
0.010
0.009
0.009
0.085
0.094
0.053
MIN
0.80
0.00
0.80
0.15
0.15
0.08
0.08
1.85
1.80
1.15
MAX
1.10
0.10
1.00
0.30
0.25
0.22
0.20
2.15
2.40
1.35
NOTES
5
1
4
A
A1
A2
b
0.031
0.000
0.031
0.006
0.006
0.003
0.003
0.073
0.071
0.045
-
-
-
-
E
C
L
C
E1
L
2
3
b
b1
c
e
6
6
3
-
C
L
c1
D
0.20 (0.008) M
C
C
C
L
E
E1
e
3
-
SEATING
PLANE
0.0256 Ref
0.0512 Ref
0.010 0.018
0.65 Ref
1.30 Ref
0.26 0.46
A2
A1
A
e1
L
-
-C-
4
-
L1
L2
0.017 Ref.
0.420 Ref.
0.10 (0.004)
C
0.006 BSC
o
0.15 BSC
o
o
o
0
8
0
8
-
α
N
b
WITH
5
5
5
PLATING
b1
R
0.004
0.004
-
0.10
0.15
-
R1
0.010
0.25
c
c1
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
6. These Dimensions apply to the flat section of the lead between
0.08mm and 0.15mm from the lead tip.
GAUGE PLANE
SEATING
PLANE
7. Controlling dimension: MILLIMETER. Converted inch dimen-
sions are for reference only.
L
C
α
L2
L1
4X θ1
VIEW C
0.4mm
0.75mm
2.1mm
0.65mm
TYPICAL RECOMMENDED LAND PATTERN
FN9235.1
March 11, 2008
10
相关型号：
ISL9011AIRBBZ-T
Dual LDO with Low Noise, Low IQ, and High PSRR; DFN10; Temp Range: -40° to 85°C
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ISL9011AIRBJZ-T
Dual LDO with Low Noise, Low IQ, and High PSRR; DFN10; Temp Range: -40° to 85°C
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