DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
General Description
Features
The AAT3258 combines a high performance, low noise,
300mA low dropout (LDO) linear regulator with a microprocessor reset monitor. The 300mA output capability of
the LDO regulator makes this device ideal for use with
microprocessors and DSP cores in portable products. The
microprocessor reset monitor section has very low quiescent current consumption and has an active low reset
output. The AAT3258 has separate input pins for the
reset monitor and LDO regulator so they may be operated from independent sources for increased design flexibility. This device features very low quiescent current,
typically less than 71µA.
• Integrated LDO Regulator with µP Reset
• 300mA Output LDO Regulator
• Low Dropout Regulator, 400mV at 300mA
• High LDO Output Voltage Accuracy, Typically 1.5%
• Very Low Noise and High Power Supply Rejection Ratio
(PSRR) LDO
• Low Quiescent Current at 71µA
• LDO Over-Current/Short-Circuit Protection
• LDO Over-Temperature Protection
• LDO Power Saving Shutdown Mode
• Independent Device Power Inputs
• High Accuracy Reset Monitor Threshold: ±1.5%
• Active Low Push-Pull Monitor Reset Output
• 1.2V
VOUT < 0.4V
VIN = 5V, No Load, SHDN = VIN
VIN = 5V, SHDN = 0V
VIN = VOUT + 1 to 5.0V
DVOUT (line)
Dynamic Line Regulation
IOUT = 300mA, TR/TR = 2µs, VIN = VOUT + 1V
to VOUT + 2V
2.5
mV
VOUT (load)
TENDLY
VDO
VIL
VIH
IIL
IIH
Dynamic Load Regulation
Enable Delay Time
Dropout Voltage2
Input Low Voltage
Input High Voltage
Input Low Current
Input High Current
IOUT = 1mA to 300mA, TR < 5µs
BYP = Open
IOUT = 300mA
60
15
400
mV
µs
mV
V
V
µA
µA
VOUT
IOUT
ISC
IGND
ISHDN
DVOUT/VOUT*DVIN
PSRR
TSD
THYS
eN
TC
Power Supply Rejection Ratio
600
70
125
1.0
0.09
600
0.6
1.5
1.0
1.0
IOUT = 10mA,
CBYP = 10nF
1kHz
10kHz
100kHz
67
47
45
145
12
50
22
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Output Noise
Output Voltage Temperature Coefficient
%
mA
mA
µA
µA
%/V
dB
°C
°C
µVRMS
ppm/°C
Microprocessor Reset Monitor
VDET
IQ
Input Voltage Range
Quiescent Current
TA = 0°C to +70°C
TA = -40°C to +85°C
1.05
3.0
0.85
0.85
2.0
2.0
1.0
2.67
2.49
IDD
IDOFF
Operating Supply Current
Reset Leakage Current
VTH
Reset Threshold Voltage
TA = 25°C
Reset Threshold Tempco
Reset Propagation Delay
Reset Active Timeout Period
MR Minimum Pulse Width
MR Glitch Immunity
MR Pull-Up Resistance
TMD
MR to Reset Propagation Delay
VIH
VIL
MR Input Threshold (high)
MR Input Threshold (low)
VOL
Reset Low Voltage
VOH
Reset High Voltage
5.5
5.5
VCC = 5.5V
VCC = 3.0V
VDET = 3.0V
VDET > VTH
DVTH/°C
TP
TRDY
TMR
MRGI
RMR
1
1.2
AAT3258xxx-x.x-R
AAT3258xxx-x.x-Y
2.59
2.41
VDET = VTH to (VTH - 100mV)
150
10
30
2.63
2.45
40
15
250
400
100
65
90
0.5
VDET = VTH(MAX)
VDET = VTH(MAX)
ISINK = 1.2mA, VDET = VTH(MIN), VTH ≤ 3.08V,
Reset Asserted
ISINK = 3.2mA, VDET = VTH(MIN), VTH > 3.08V,
Reset Asserted
0.7 · VDET
ISOURCE = 800µA, VDET > 3.08V, VDET > VTH(MAX)
VDET - 1.5
ISOURCE = 500µA, VDET > VTH(MAX), VTH ≤ 3.08V
0.8 · VDET
V
µA
µA
µA
V
ppm/°C
µs
ms
µs
ns
kW
µs
0.25 · VDET
0.3
0.4
V
V
V
V
1. The AAT3258 is guaranteed to meet performance specifications over the -40°C to 85°C operating temperature range and is assured by design, characterization, and correlation
with statistical process controls.
2. VDO is defined as VIN - VOUT when VOUT is 98% of nominal.
4
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DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Dropout Characteristics
Dropout Voltage vs. Temperature
3.20
IL = 300mA
480
Output Voltage (V)
Dropout Voltage (mV)
540
420
360
300
IL = 100mA
IL = 150mA
240
180
120
60
-40 -30 -20 -10 0
2.80
IOUT = 300mA
IOUT = 150mA
2.60
2.40
IOUT = 10mA
2.20
IL = 50mA
0
IOUT = 0mA
3.00
2.00
2.70
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
2.80
3.00
3.10
3.20
3.30
Ground Current vs. Input Voltage
90.00
500
Ground Current (µA)
450
Dropout Voltage (mV)
2.90
Input Voltage (V)
Dropout Voltage vs. Output Current
400
350
300
85°C
250
200
25°C
150
-40°C
100
50
80.00
70.00
60.00
0
50
100
150
200
250
IOUT = 150mA
IOUT = 50mA
40.00
IOUT = 0mA
30.00
IOUT = 10mA
20.00
10.00
0.00
300
Output Current (mA)
IOUT = 300mA
50.00
0
2
2.5
3
3.5
4
4.5
5
Input Voltage (V)
Quiescent Current vs. Temperature
Output Voltage vs. Temperature
1.203
100
90
1.202
80
Output Voltage (V)
Quiescent Current (µA)
IOUT = 100mA
IOUT = 50mA
70
60
50
40
30
20
10
0
-40 -30 -20 -10
0
1.200
1.199
1.198
1.197
1.196
-40 -30 -20 -10
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
1.201
0
10 20
30
40
50 60
70 80
90 100
Temperature (°C)
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5
DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Turn-Off Response Time
Initial Power-Up Response Time
(CBYP = 10nF)
(CBYP = 10nF)
VSHDN (5V/div)
VSHDN (5V/div)
VOUT (1V/div)
VOUT (1V/div)
Time (400µs/div)
Time (50µs/div)
Turn-On Time From Enable (VIN present)
Line Transient Response
(CBYP = 10nF)
6
VSHDN (5V/div)
3.04
Input Voltage (V)
4
3.02
3
3.01
2
3.00
VOUT
1
VIN = 4V
VOUT = 1V/div
2.98
Time (100µs/div)
Load Transient Response 300mA
500
2.85
400
2.75
200
2.70
2.65
2.60
100
0
IOUT
6
800
2.90
700
2.80
2.70
600
VOUT
500
2.60
400
2.50
300
2.40
2.30
200
IOUT
100
2.20
-100
Time (100µs/div)
3.00
0
2.10
-100
Time (10µs/div)
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Output Current (mA)
300
Output Voltage (V)
2.90
Output Current (mA)
Output Voltage (V)
Load Transient Response
2.80
2.99
0
Time (5µs/div)
VOUT
3.03
VIN
Output Voltage (V)
5
DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
AAT3258 Self Noise
Over-Current Protection
1200
Output Current (mA)
Noise Amplitude (µV/rtHz)
(COUT = 10µF, ceramic)
10
1
0.1
Band Power:
300Hz to 50kHz = 44.6µVrms/rtHz
100Hz to 100kHz = 56.3µVrms/rtHz
0.01
0.001
0.01
1000
800
600
400
200
0
-200
0.1
1
10
100
1000
Time (20ms/div)
10000
Frequency (kHz)
Normalized Reset Threshold
vs. Temperature
LDO SHDN VIH and V IL vs. VIN
1.250
VIH
1.175
1.150
1.125
VIL
1.100
1.075
1.050
2.5
3.0
3.5
1.003
Normalized Threshold
1.225
1.200
4.0
4.5
5.0
1.002
1.001
1.000
0.999
0.998
0.997
-40
5.5
Reset Propagation Delay (µs)
Power-Up Reset
Timeout (ms)
300
280
260
240
220
200
180
160
20
40
40
60
80
Power-Down Reset Propagation
Delay vs. Temperature
320
0
20
Power-Up Reset Timeout
vs. Temperature
-20
0
Temperature (°C)
Input Voltage (V)
-40
-20
60
80
100
Temperature (°C)
30
25
VDO = 10mV
20
15
10
VDO = 100mV
5
0
-40
-20
0
20
40
60
80
Temperature (°C)
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7
DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Maximum Transient Duration
vs. Reset Threshold Overdrive
Maximum Transient
Duration (µs)
400
350
300
250
200
150
100
50
0
1
10
100
Reset Threshold Overdrive,
VTH-VCC (mV)
1000
8
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DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
Functional Block Diagram
OUT
VIN
Over-Current
Protection
OverTemperature
Protection
+
Error
Amplifier
-
Voltage
Reference
BYP
SHDN
VDET
MR
+
Reset Generator
and Timer
RESET
-
Voltage
Reference
Oscillator
GND
Functional Description
The AAT3258 is intended for LDO regulator applications
where output current load requirements range from no
load to 300mA.
Fast turn-off response time is achieved by an active output pull-down circuit, which is enabled when the LDO
regulator is placed in the shutdown mode. This active
fast shutdown circuit has no adverse effect on normal
device operation.
The advanced circuit design of the AAT3258 has been
specifically optimized for very fast start-up and shutdown timing. This proprietary CMOS LDO has also been
tailored for superior transient response characteristics.
These traits are particularly important for applications
that require fast power supply timing, such as GSM cellular telephone handsets.
The AAT3258 has very fast transient response characteristics, which is an important feature for applications
where fast line and load transient response is required.
This rapid transient response behavior is accomplished
through the implementation of an active error amplifier
feedback control. This proprietary circuit design is unique
to this MicroPower LDO regulator.
The high-speed turn-on capability is enabled through the
implementation of a fast start control circuit, which
accelerates the power-up behavior of fundamental control and feedback circuits within the LDO regulator.
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.
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9
DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
A bypass pin has been provided to allow the addition of
an optional voltage reference bypass capacitor to reduce
output self noise and increase power supply ripple rejection. Device self noise and PSRR will be improved by the
addition of a small ceramic capacitor in this pin. However,
increased values of CBYPASS may slow down the LDO regulator turn-on time.
This LDO regulator has complete short-circuit and thermal protection. The integral combination of these two
internal protection circuits gives the AAT3258 a comprehensive safety system to guard against 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 current loads.
The microprocessor reset section monitors the supply
voltage to a microprocessor and asserts a reset signal
whenever the VDET voltage falls below a factory-programmed threshold. This threshold is accurate within
±1.5% at 25°C. The reset signal remains asserted for a
minimum of 150ms after VDET has risen above the
threshold, as shown in Figure 1.
LDO Regulator Applications
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
AAT3258 is physically located more than three centimeters 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.
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.
To assure the maximum possible performance is obtained
from the AAT3258, please refer to the following application recommendations.
VTH
VTH
VTH
VDET
RESET
tRDY
tRDY
Figure 1: Reset Signal Assertion.
10
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DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
Output Capacitor
For proper load voltage regulation and operational stability, 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 possible for maximum device performance.
The AAT3258 has been specifically designed to function
with very low ESR ceramic capacitors. For best performance, ceramic capacitors are recommended.
Typical output capacitor values for maximum output current conditions range from 1µF to 10µF. Applications
utilizing the exceptionally low output noise and optimum
power supply ripple rejection characteristics of the
AAT3258 should use 2.2µF or greater for COUT. If desired,
COUT may be increased without limit.
In low output current applications where output load is
less than 10mA, the minimum value for COUT can be as
low as 0.47µF.
Bypass Capacitor and
Low Noise Applications
A bypass capacitor pin is provided to enhance the low
noise characteristics of the AAT3258 LDO regulator. The
bypass capacitor is not necessary for operation. However,
for best device performance, a small ceramic capacitor
should be placed between the bypass pin (BYP) and the
device ground pin (GND). The value of CBYP may range
from 470pF to 10nF. For lowest noise and best possible
power supply ripple rejection performance, a 10nF
capacitor should be used. To practically realize the highest power supply ripple rejection and lowest output
noise performance, it is critical that the capacitor connection between the BYP pin and GND pin be direct and
PCB traces should be as short as possible. Refer to the
Evaluation Board Layout section of this document for
examples.
There is a relationship between the bypass capacitor
value and the LDO regulator turn-on and turn-off time.
In applications where fast device turn-on and turn-off
time are desired, the value of CBYP should be reduced.
In applications where low noise performance and/ or
ripple rejection are less of a concern, the bypass capacitor may be omitted. The fastest device turn-on time will
be realized when no bypass capacitor is used.
DC leakage on this pin can affect the LDO regulator output noise and voltage regulation performance. For this
reason, the use of a low leakage, high quality, ceramic
(NPO or C0G type) or film capacitor is highly recommended.
Capacitor Characteristics
Ceramic composition capacitors are highly recommended
over all other types of capacitors. Ceramic capacitors
offer many advantages over their tantalum and aluminum
electrolytic counterparts. 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 capacitors. Since ceramic capacitors are
non-polarized, they are not prone to incorrect connection
damage.
Equivalent Series Resistance: ESR is a very important characteristic to consider when selecting a capacitor. ESR is the internal series resistance associated with
a capacitor that includes lead resistance, internal connections, size and area, material composition, and ambient temperature. Typically, capacitor ESR is measured in
milliohms for ceramic capacitors and can range to more
than several ohms for tantalum or aluminum electrolytic
capacitors.
Ceramic Capacitor Materials: Ceramic capacitors less
than 0.1µF are typically made from NPO or C0G materials. NPO and C0G materials generally have tight tolerance 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%.
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11
DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
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 equivalent material and capacitance value. These larger devices
can improve circuit transient response when compared to
an equal value capacitor in a smaller package size.
Consult capacitor vendor datasheets carefully when
selecting capacitors for LDO regulators.
Shutdown Function
The shutdown pin is designed to turn off the LDO regulator when the device is not in use. This pin is active high
and is compatible with CMOS logic. To assure the LDO
regulator will switch on, the SHDN turn-on control level
must be greater than 1.5V. The LDO regulator will go
into the disable shutdown mode when the voltage falls
below 0.6V. If the shutdown function is not needed in a
specific application, it may be tied to VIN to keep the LDO
regulator in a continuously on state.
When the LDO regulator is in the shutdown mode, an
internal 1.5kW resistor is connected between VOUT and
GND. This is intended to discharge COUT when the LDO
regulator is disabled. The internal 1.5kW has no adverse
effect on device turn-on time.
Short-Circuit Protection
The LDO regulator section contains an internal shortcircuit 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 current limited until the short-circuit condition is
removed from the output or the LDO regulator package
power dissipation exceeds the device thermal limit.
Thermal Protection
The AAT3258 has an internal thermal protection circuit
which will turn on when the device die temperature
exceeds 145°C. The internal thermal protection circuit
12
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 shutdown state until the internal die temperature falls back
below the 145°C trip point.
The combination and interaction between the short-circuit and thermal protection systems allows the LDO
regulator to withstand indefinite short-circuit conditions
without sustaining permanent damage.
No-Load Stability
The LDO regulator is designed to maintain output voltage regulation and stability under operational no-load
conditions. This is an important characteristic for applications where the output current may drop to zero.
Reverse Output-to-Input
Voltage Conditions and Protection
Under normal operating conditions, a parasitic diode
exists between the output and input of the LDO regulator. 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 current flow into the VOUT pin, possibly damaging the LDO
regulator.
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 shutdown, thus
preventing VOUT from exceeding VIN. In applications 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.
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DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
MicroPower Supervisory
Circuit Applications
Supply Voltage Transient Behavior
Reset Output Options
The reset pin is an active low push-pull output. In the
event of a power down or brown-out condition, the reset
signal remains valid until the VDET drops below 1.2V.
Manual Reset Input
A logic low signal on MR asserts a reset condition. Reset
continues to be asserted as long as MR is low and for a
minimum of 150ms after MR returns high. This input is
internally pulled up to VCC via a 20kW resistor, so leaving
the pin unconnected is acceptable if a manual reset
function is not needed. The MR input is internally
debounced, which allows use of a mechanical switch. It
should be a normally-open momentary switch connected
from MR to GND. Additionally, the MR pin can be driven
from TTL, CMOS, or open drain logic outputs.
In some cases, fast negative transients of short duration
can appear on the VCC power supply. The AAT3258 series
device provides some immunity to line transients which
can generate invalid reset pulses. Figure 2 shows typical
behavior of short duration pulses versus RESET comparator overdrive. As shown in the Maximum Transient
Duration vs. Reset Threshold Overdrive graph, when the
transient voltage becomes larger, the time allowed
before asserting a reset becomes shorter (e.g., typically
a transient of 100mV below the reset threshold would
have to be present for more than 50ms to cause a reset).
Immunity can be increased by the addition of a small
bypass capacitor of 0.1µF connected as closely to the VCC
pin as possible.
Evaluation Board Layout
The AAT3258 evaluation layout (Figures 3, 4, and 5) follows the recommend printed circuit board layout procedures and can be used as an example for good
application layouts.
Note: Board layout shown is not to scale.
VCC
VCC
VDET
0.1µF
RESET
MR
GND
RESET
µP
INPUT
GND
Figure 2: Typical Behavior of Short Duration Pulses vs. RESET Comparator Overdrive.
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13
DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
Figure 3: Evaluation Board
Component Side Layout.
Figure 4: Evaluation Board
Solder Side Layout.
Figure 5: Evaluation Board Top Side
Silk Screen Layout / Assembly Drawing.
14
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DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
Ordering Information
Package
Reset Threshold Voltage1
LDO Regulator
Marking2
Part Number (Tape and Reel)3
TSOPJW-8
TSOPJW-8
TSOPJW-8
TSOPJW-8
2.63V
2.45V
2.63V
2.63V
2.80V
2.80V
3.0V
3.3V
IIXYY
IHXYY
MEXYY
MXXYY
AAT3258ITS-2.8-R-T1
AAT3258ITS-2.8-Y-T1
AAT3258ITS-3.0-R-T1
AAT3258ITS-3.3-R-T1
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.
Package Information
TSOPJW-8
2.85 – 0.20
2.40 – 0.10
0.325 – 0.075
0.65 BSC 0.65 BSC 0.65 BSC
7
0.055 – 0.045
0.04 REF
0.15 – 0.05
1.0175 – 0.0925
0.9625 – 0.0375
3.025 – 0.075
0.010
0.45 – 0.15
2.75 – 0.25
All dimensions in millimeters.
1. Consult the factory for any additional reset or low dropout voltages.
2. XYY = assembly and date code.
3. Sample stock is generally held on part numbers listed in BOLD.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202261A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012
15
DATA SHEET
AAT3258
300mA LDO Linear Regulator with µP Reset
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
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16
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202261A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012
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