AAT3237IJS-3.3-T1 [SKYWORKS]
Fixed Positive LDO Regulator,;
| 型号： | AAT3237IJS-3.3-T1 |
| 厂家： | 
SKYWORKS SOLUTIONS INC. |
| 描述： | Fixed Positive LDO Regulator, |
| 文件： | 总13页 (文件大小：1127K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
General Description
Features
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The AAT3237 MicroPower low dropout (LDO) linear regu-
lator is ideally suited for portable applications where low
noise, extended battery life, and small size are critical.
The AAT3237 has been specifically designed for low out-
put noise performance, fast transient response, and high
power supply rejection ratio (PSRR).
Low Dropout: 400mV at 300mA
Guaranteed 300mA Output
High Accuracy ±1.5%
70µA Quiescent Current
High Power Supply Ripple Rejection
Power-OK (POK) Output
Fast Line and Load Transient Response
Short-Circuit Protection
Over-Temperature Protection
Uses Low Equivalent Series Resistance (ESR) Ceramic
Capacitors
Shutdown Mode for Longer Battery Life
Low Temperature Coefficient
13 Factory-Programmed Output Voltages
SOT23 6-Pin or SC70JW 8-Pin Package
Other features include low quiescent current, typically
70µA, and low dropout voltage, typically less than
400mV at full output current. The device is output short-
circuit protected and has a thermal shutdown circuit for
additional protection under extreme conditions.
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The AAT3237 also features a low-power shutdown mode
for extended battery life. A Power-OK open-drain output
signals when VOUT is in regulation.
The AAT3237 is available in a Pb-free, space-saving
6-pin SOT23 or 8-pin SC70JW package in 13 factory-
programmed voltages: 1.2V, 1.5V, 1.8V, 2.0V, 2.3V, 2.5V,
2.7V, 2.8V, 2.85V, 2.9V, 3.0V, 3.3V, or 3.5V.
Applications
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Cellular Phones
Desktop Computers
Digital Cameras
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
Typical Application
VIN
VOUT
POK
IN
OUT
AAT3237
ON/OFF
EN
POK
GND
1µF
2.2µF
GND
GND
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
Pin Descriptions
Pin Number
Symbol Function
SOT23-6
SC70JW-8
1
2, 5
5, 6
8
IN
GND
Input voltage pin; should be decoupled with 1µF or greater capacitor.
Ground connection pin.
Enable pin; this pin should not be left floating. When pulled low, the PMOS pass transistor
turns off and all internal circuitry enters low-power mode, consuming less than 1µA.
3
7
EN
Power-OK output. This open-drain output is low when OUT is out of regulation. Connect a
pull-up resistor from POK to OUT.
Output pin; should be decoupled with 2.2µF ceramic capacitor.
4
6
1
POK
OUT
2, 3, 4
Pin Configuration
SOT23-6
(Top View)
SC70JW-8
(Top View)
6
1
OUT
IN
GND
EN
8
7
6
5
1
2
3
4
GND
EN
IN
POK
OUT
OUT
OUT
2
3
5
4
GND
POK
IN
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol
Description
Value
Units
VIN, POK
VENIN(MAX)
IOUT
TJ
TLEAD
Input Voltage, POK
Maximum EN to Input Voltage
DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec.)
6
0.3
PD/(VIN - VO)
-40 to 150
300
V
mA
°C
Thermal Information2
Symbol
Description
Rating
Units
QJA
PD
Maximum Thermal Resistance (SOT23-6, SC70JW-8)
Maximum Power Dissipation (SOT23-6, SC70JW-8)
150
667
°C/W
mW
Recommended Operating Conditions
Symbol
Description
Input Voltage3
Ambient Temperature Range
Rating
Units
VIN
T
(VOUT + VDO) to 5.5
-40 to +85
V
°C
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied.
2. Mounted on a demo board.
3. To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5V.
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
Electrical Characteristics
VIN = VOUT(NOM) + 1V for VOUT options greater than 1.5V. VIN = 2.5V for VOUT ≤ 1.5V. IOUT = 1mA, COUT = 2.2µF, CIN = 1µF,
TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description
Conditions
Min Typ Max Units
TA = 25°C
TA = -40 to 85°C -2.5
300
-1.5
1.5
2.5
%
VOUT
Output Voltage Tolerance
IOUT = 1mA to 300mA
IOUT
VDO
ISC
IQ
ISD
Output Current
VOUT > 1.2V
IOUT = 300mA
VOUT < 0.4V
mA
mV
mA
Dropout Voltage1, 2
Short-Circuit Current
Ground Current
400
600
70
600
VIN = 5V, No Load, EN = VIN
VIN = 5V, EN = 0V
125
1
µA
Shutdown Current
DVOUT
VOUT*DVIN
/
Line Regulation3
VIN = VOUT + 1 to 5.0V
0.09
%/V
VIN = VOUT + 1V to VOUT + 2V,
IOUT = 300mA, TR/TF = 2µs
DVOUT(line) Dynamic Line Regulation
5
mV
DVOUT(load) Dynamic Load Regulation
IOUT = 1mA to 300mA, TR <5µs
60
VEN(L)
VEN(H)
IEN
Enable Threshold Low
Enable Threshold High
Leakage Current on Enable Pin
POK Trip Threshold
POK Hysteresis
POK Output Voltage Low
POK Output Leakage Current
0.6
V
1.5
90
VEN = 5V
VOUT Rising, TA = 25°C
1
98
µA
VPOK
94
1
% of
VOUT
VPOKHYS
VPOK(OL)
IPOK
ISINK = 1mA
VPOK < 5.5V, VOUT in Regulation
0.4
1
V
µA
1kHz
10kHz
1MHz
65
45
42
PSRR
Power Supply Rejection Ratio
IOUT = 10mA
dB
TSD
THYS
eN
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Output Noise
145
12
250
22
°C
µVrms
ppm/°C
TC
Output Voltage Temperature Coefficient
1. VDO is defined as VIN - VOUT when VOUT is 98% of nominal.
2. For VOUT < 2.1V, VDO = 2.5V - VOUT
.
3. CIN = 10µF.
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Dropout Voltage vs. Temperature
Dropout Characteristics
3.20
540
480
3.00
IL = 300mA
IOUT = 0mA
420
360
2.80
300
IOUT = 300mA
IOUT = 150mA
2.60
IL = 100mA
IL = 150mA
240
180
120
60
2.40
IOUT = 100mA
IOUT = 50mA
2.20
IOUT = 10mA
IL = 50mA
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
0
2.00
2.70
-40 -30 -20 -10
0
2.80
2.90
3.00
3.10
3.20
3.30
Input Voltage (V)
Dropout Voltage vs. Output Current
Ground Current vs. Input Voltage
90.00
500
450
400
350
300
250
200
150
100
50
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
IOUT = 300mA
85°C
IOUT = 150mA
IOUT = 50mA
25°C
IOUT = 0mA
IOUT = 10mA
-40°C
0
0
50
100
150
200
250
300
2
2.5
3
3.5
4
4.5
5
Input Voltage (V)
Output Current (mA)
Quiescent Current vs. Temperature
Output Voltage vs. Temperature
100
90
80
70
60
50
40
30
20
10
0
1.203
1.202
1.201
1.200
1.199
1.198
1.197
1.196
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100 110 120
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100
Temperature (°C)
Temperature (°C)
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Turn-On Time and POK Delay
Line Transient Response
6
5
3.25
3.20
3.15
3.10
3.05
3.00
2.95
2.90
2.85
VENABLE (2V/div)
VIN
4
VOUT (500mV/div)
VPOK (500mV/div)
3
2
1
VOUT
0
-1
-2
Time (10µs/div)
Time (100µs/div)
Load Transient Response
Load Transient Response 300mA
2.90
2.85
2.80
2.75
2.70
2.65
2.60
500
400
300
200
100
0
3.00
2.90
2.80
2.70
2.60
2.50
2.40
2.30
2.20
2.10
800
700
600
500
400
300
200
100
0
VOUT
VOUT
IOUT
IOUT
-100
-100
Time (100µs/div)
Time (10µs/div)
Over-Current Protection
AAT3237 Self Noise
1200
1000
800
600
400
200
0
10
1
0.1
0.01
-200
0.01
0.1
1
10
100
1000
Time (20ms/div)
Frequency (kHz)
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
VEN(H) and VEN(L) vs. VIN
1.250
1.225
1.200
1.175
VEN(H)
1.150
1.125
1.100
VEN(L)
1.075
1.050
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VIN (V)
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
Functional Block Diagram
IN
OUT
Over-Current
Protection
Over-Temperature
Protection
Error
Amplifier
EN
POK
Voltage
Reference
94%
GND
The device enable circuit is provided to shut down the
LDO regulator for power conservation in portable prod-
ucts. The enable circuit has an additional output capaci-
tor discharge circuit to assure sharp application circuit
turn-off upon device shutdown.
Functional Description
The AAT3237 is intended for LDO regulator applications
where output current load requirements range from no
load to 300mA.
The advanced circuit design of the AAT3237 provides
excellent transient response and fast turn-on ability. The
LDO regulator output has been specifically optimized to
function with low-cost, low-ESR ceramic capacitors.
However, the design will allow for operation over a wide
range of capacitor types.
This LDO regulator has complete short-circuit and ther-
mal protection. The integral combination of these two
internal protection circuits gives the AAT3237 a compre-
hensive safety system during extreme adverse operating
conditions. Device power dissipation is limited to the
package type and thermal dissipation properties. Refer
to the Thermal Considerations section of this datasheet
for details on device operation at maximum output cur-
rent loads.
The AAT3237 has an integrated Power-OK comparator
which indicates when the output is out of regulation.
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
Capacitor Characteristics
Applications Information
Ceramic composition capacitors are highly recommended
over all other types of capacitors for use with the
AAT3237. Ceramic capacitors offer many advantages
over their tantalum and aluminum electrolytic counter-
parts. A ceramic capacitor typically has very low ESR, is
lower cost, has a smaller PCB footprint, and is non-
polarized. Line and load transient response of the LDO
regulator is improved by using low ESR ceramic capaci-
tors. Since ceramic capacitors are non-polarized, they
are not prone to incorrect connection damage.
To assure the maximum possible performance is obtained
from the AAT3237, please refer to the following applica-
tion recommendations.
Input Capacitor
Typically, a 1µF or larger capacitor is recommended for
CIN in most applications. A CIN capacitor is not required
for basic LDO regulator operation. However, if the
AAT3237 is physically located more than three centime-
ters from an input power source, a CIN capacitor will be
needed for stable operation. CIN should be located as
closely to the device VIN pin as practically possible. CIN
values greater than 1µF will offer superior input line
transient response and will assist in maximizing the
highest possible power supply ripple rejection.
Equivalent Series Resistance: ESR is a very important
characteristic to consider when selecting a capacitor. ESR
is the internal series resistance associated with a capac-
itor that includes lead resistance, internal connections,
size and area, material composition, and ambient tem-
perature. Typically, capacitor ESR is measured in millio-
hms for ceramic capacitors and can range to more than
several ohms for tantalum or aluminum electrolytic
capacitors.
Ceramic, tantalum, or aluminum electrolytic capacitors
may be selected for CIN. There is no specific capacitor ESR
requirement for CIN. However, for 300mA LDO regulator
output operation, ceramic capacitors are recommended
for CIN due to their inherent capability over tantalum
capacitors to withstand input current surges from low
impedance sources such as batteries in portable devices.
Ceramic Capacitor Materials: Ceramic capacitors less
than 0.1µF are typically made from NPO or C0G materi-
als. NPO and C0G materials generally have tight toler-
ance and are very stable over temperature. Larger
capacitor values are usually composed of X7R, X5R, Z5U,
or Y5V dielectric materials. These two material types are
not recommended for use with LDO regulators since the
capacitor tolerance can vary more than ±50% over the
operating temperature range of the device. A 2.2µF Y5V
capacitor could be reduced to 1µF over temperature; this
could cause problems for circuit operation. X7R and X5R
dielectrics are much more desirable. The temperature
tolerance of X7R dielectric is better than ±15%.
Output Capacitor
For proper load voltage regulation and operational stabil-
ity, a capacitor is required between pins VOUT and GND.
The COUT capacitor connection to the LDO regulator
ground pin should be made as direct as practically pos-
sible for maximum device performance.
The AAT3237 has been specifically designed to function
with very low ESR ceramic capacitors. For best perfor-
mance, ceramic capacitors are recommended.
Capacitor area is another contributor to ESR. Capacitors
that are physically large in size will have a lower ESR
when compared to a smaller sized capacitor of an equiv-
alent material and capacitance value. These larger
devices can improve circuit transient response when
compared to an equal value capacitor in a smaller pack-
age size.
Typical output capacitor values for maximum output cur-
rent conditions range from 1µF to 10µF. Applications
utilizing the exceptionally low output noise and optimum
power supply ripple rejection characteristics of the
AAT3237 should use 2.2µF or greater for COUT. If desired,
COUT may be increased without limit.
Consult capacitor vendor datasheets carefully when
selecting capacitors for LDO regulators.
In low output current applications where output load is
less than 10mA, the minimum value for COUT can be as
low as 0.47µF.
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
The combination and interaction between the short-cir-
cuit and thermal protection systems allows the LDO
regulator to withstand indefinite short-circuit conditions
without sustaining permanent damage.
POK Output
The AAT3237 features an integrated Power-OK compara-
tor which can be used as an error flag. The POK open-
drain output goes low when OUT is 6% below its nominal
regulation voltage. Connect a pull-up resistor from POK
to OUT.
No-Load Stability
The AAT3237 is designed to maintain output voltage
regulation and stability under operational no-load condi-
tions. This is an important characteristic for applications
where the output current may drop to zero.
Enable Function
The AAT3237 features an LDO regulator enable/disable
function. This pin (EN) is active high and is compatible
with CMOS logic. To assure the LDO regulator will switch
on, the EN turn-on control level must be greater than
2.0V. The LDO regulator will go into the disable shut-
down mode when the voltage on the EN pin falls below
0.6V. If the enable function is not needed in a specific
application, it may be tied to VIN to keep the LDO regula-
tor in a continuously on state.
Reverse Output-to-Input
Voltage Conditions and Protection
Under normal operating conditions, a parasitic diode
exists between the output and input of the LDO regula-
tor. The input voltage should always remain greater than
the output load voltage, maintaining a reverse bias on
the internal parasitic diode. Conditions where VOUT might
exceed VIN should be avoided since this would forward
bias the internal parasitic diode and allow excessive cur-
rent flow into the VOUT pin, possibly damaging the LDO
regulator.
When the LDO regulator is in shutdown mode, an inter-
nal 1.5kW resistor is connected between VOUT and GND.
This is intended to discharge COUT when the LDO regula-
tor is disabled. The internal 1.5kW has no adverse effect
on device turn-on time.
In applications where there is a possibility of VOUT
exceeding VIN for brief amounts of time during normal
operation, the use of a larger value CIN capacitor is
highly recommended. A larger value of CIN with respect
to COUT will effect a slower CIN decay rate during shut-
down, thus preventing VOUT from exceeding VIN. In appli-
cations where there is a greater danger of VOUT exceeding
VIN for extended periods of time, it is recommended to
place a Schottky diode across VIN to VOUT (connecting the
cathode to VIN and anode to VOUT). The Schottky diode
forward voltage should be less than 0.45V.
Short-Circuit Protection
The AAT3237 contains an internal short-circuit protection
circuit that will trigger when the output load current
exceeds the internal threshold limit. Under short-circuit
conditions, the output of the LDO regulator will be cur-
rent limited until the short-circuit condition is removed
from the output or LDO regulator package power dissi-
pation exceeds the device thermal limit.
Thermal Protection
The AAT3237 has an internal thermal protection circuit
which will turn on when the device die temperature
exceeds 145°C. The internal thermal protection circuit
will actively turn off the LDO regulator output pass
device to prevent the possibility of over-temperature
damage. The LDO regulator output will remain in a shut-
down state until the internal die temperature falls back
below the 145°C trip point.
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
Ordering Information
Output Voltage
Package
Marking1
Part Number (Tape and Reel)2
1.2V
1.5V
1.8V
2.0V
2.3V
2.5V
2.7V
3.3V
3.5V
1.2V
1.5V
1.8V
2.0V
2.3V
2.5V
2.7V
2.8V
2.85V
2.9V
3.0V
3.3V
3.5V
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SC70JW-8
SC70JW-8
SC70JW-8
SC70JW-8
SC70JW-8
SC70JW-8
SC70JW-8
SC70JW-8
SC70JW-8
SC70JW-8
SC70JW-8
SC70JW-8
SC70JW-8
AAT3237IGU-1.2-T1
AAT3237IGU-1.5-T1
AAT3237IGU-1.8-T1
AAT3237IGU-2.0-T1
AAT3237IGU-2.3-T1
AAT3237IGU-2.5-T1
AAT3237IGU-2.7-T1
AAT3237IGU-3.3-T1
AAT3237IGU-3.5-T1
AAT3237IJS-1.2-T1
AAT3237IJS-1.5-T1
AAT3237IJS-1.8-T1
AAT3237IJS-2.0-T1
AAT3237IJS-2.3-T1
AAT3237IJS-2.5-T1
AAT3237IJS-2.7-T1
AAT3237IJS-2.8-T1
AAT3237IJS-2.85-T1
AAT3237IJS-2.9-T1
AAT3237IJS-3.0-T1
AAT3237IJS-3.3-T1
AAT3237IJS-3.5-T1
HRXYY
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
1. XYY = assembly and date code.
2. Sample stock is generally held on all part numbers listed in BOLD.
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•
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
Package Information
SOT23-6
2.85 0.15
1.90 BSC
0.95 BSC
0.15 0.07
GAUGE PLANE
10° 5°
0.60 REF
0.40 0.10 × 6
0.45 0.15
0.10 BSC
SC70JW-8
0.50 BSC 0.50 BSC 0.50 BSC
0.225 0.075
2.00 0.20
0.048REF
0.100
0.45 0.10
4° 4°
7° 3°
2.10 0.30
All dimensions in millimeters.
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DATA SHEET
AAT3237
300mA MicroPowerTM LDO with PowerOK
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
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responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
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THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR
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NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, IN-
CLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM
THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or en-
vironmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper
use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of pub-
lished parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
Skyworks Solutions, Inc.
• Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012
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