Analogic AAT3216IJS-3.0-T1 150ma micropowerâ ¢ ldo with powerok Datasheet

AAT3216
150mA MicroPower™ LDO with PowerOK
General Description
Features
The AAT3216 MicroPower low dropout (LDO) linear regulator is ideally suited for portable applications where low noise, extended battery life, and
small size are critical. The AAT3216 has been
specifically designed for low output noise performance, fast transient response, and high power supply rejection ratio (PSRR), making it ideal for powering sensitive RF circuits.
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Other features include low quiescent current, typically 70µA, and low dropout voltage, typically less
than 200mV at full output current. The device is
output short-circuit protected and has a thermal
shutdown circuit for additional protection under
extreme conditions.
The AAT3216 also features a low-power shutdown
mode for extended battery life. A Power-OK opendrain output signals when VOUT is in regulation.
The AAT3216 is available in a Pb-free, space-saving
5-pin SOT23 or 8-pin SC70JW package in 12 factory-programmed voltages: 1.2V, 1.5V, 1.8V, 2.0V,
2.3V, 2.5V, 2.7V, 2.8V, 2.85V, 3.0V, 3.3V, or 3.5V.
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PowerLinear™™
SmartSwitch
Low Dropout: 200mV at 150mA
Guaranteed 150mA Output
High Accuracy: ±1.5%
70µA Quiescent Current
High Power Supply Ripple Rejection
Low Self Noise
Power-OK (POK) Output
Fast Line and Load Transient Response
Short-Circuit and Over-Temperature
Protection
Uses Low Equivalent Series Resistance
(ESR) Ceramic Capacitors
Shutdown Mode for Longer Battery Life
Low Temperature Coefficient
12 Factory-Programmed Output Voltages
SOT23 5-Pin or SC70JW 8-Pin Package
Applications
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Cellular Phones
Desktop Computers
Digital Cameras
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
Typical Application
VIN
VOUT
IN
OUT
AAT3216
ON/OFF
100k
POK
EN
POK
GND
1µF
GND
3216.2006.01.1.3
2.2µF
GND
1
AAT3216
150mA MicroPower™ LDO with PowerOK
Pin Descriptions
Pin #
Symbol
Function
SOT23-5
SC70JW-8
1
5, 6
IN
2
8
GND
3
7
EN
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.
4
1
POK
Power-OK output. This open-drain output is low when OUT is out
of regulation. Connect a pull-up resistor from POK to OUT or IN.
5
2, 3, 4
OUT
Output pin; should be decoupled with 2.2µF ceramic capacitor.
Input voltage pin; should be decoupled with 1µF or greater
capacitor.
Ground connection pin.
Pin Configuration
SOT23-5
(Top View)
IN
GND
EN
2
1
SC70JW-8
(Top View)
5
OUT
2
3
4
POK
POK
OUT
OUT
OUT
1
8
2
7
3
6
4
5
GND
EN
IN
IN
3216.2006.01.1.3
AAT3216
150mA MicroPower™ LDO with PowerOK
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol
Description
VIN, POK
VENIN(MAX)
IOUT
TJ
Input Voltage, POK
Maximum EN to Input Voltage
DC Output Current
Operating Junction Temperature Range
Value
Units
6
0.3
PD/(VIN-VO)
-40 to 150
V
V
mA
°C
Rating
Units
190
526
°C/W
mW
Thermal Information2
Symbol
ΘJA
PD
Description
Maximum Thermal Resistance (SOT23-5, SC70JW-8)
Maximum Power Dissipation (SOT23-5, SC70JW-8)
Recommended Operating Conditions
Symbol
VIN
T
Description
3
Input Voltage
Ambient Temperature Range
Rating
Units
(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. Only one Absolute Maximum Rating should be applied at any one time.
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.
3216.2006.01.1.3
3
AAT3216
150mA MicroPower™ LDO with PowerOK
Electrical Characteristics
VIN = VOUT(NOM) + 1V for VOUT options greater than 1.5V. VIN = 2.5 for VOUT ≤ 1.5V. IOUT = 1mA, COUT = 2.2µF,
CIN = 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
Description
Conditions
Output Voltage Tolerance
IOUT = 1mA to 150mA
IOUT
VDO
ISC
IQ
ISD
∆VOUT/
VOUT*∆VIN
Output Current
Dropout Voltage1, 2
Short-Circuit Current
Ground Current
Shutdown Current
VOUT > 1.2V
IOUT = 150mA
VOUT < 0.4V
VIN = 5V, No Load, EN = VIN
VIN = 5V, EN = 0V
Line Regulation3
VIN = VOUT + 1 to 5.0V
∆VOUT(line)
Dynamic Line Regulation
∆VOUT(load)
VEN(L)
VEN(H)
IEN
VPOK
VPOKHYS
VPOK(OL)
IPOK
Dynamic Load Regulation
Enable Threshold Low
Enable Threshold High
Leakage Current on Enable Pin
POK Trip Threshold
POK Hysteresis
POK Output Voltage Low
POK Output Leakage Current
VOUT
PSRR
TSD
THYS
eN
TC
Power Supply Rejection Ratio
Min Typ Max
TA = 25°C
-1.5
TA = -40 to 85°C -2.5
150
1.5
2.5
200
600
70
VIN = VOUT + 1V to VOUT + 2V,
IOUT = 150mA, TR/TF = 2µs
IOUT = 1mA to 150mA, TR<5µs
125
1
0.09
%/V
5
mV
30
1.5
ISINK = 1mA
VPOK < 5.5V, VOUT in Regulation
1kHz
IOUT = 10mA
10kHz
1MHz
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Output Noise
Output Voltage Temperature
Coefficient
90
94
1
%
mA
mV
mA
µA
µA
300
0.6
VEN = 5V
VOUT Rising, TA = 25°C
Units
1
98
0.4
1
mV
V
V
µA
% of VOUT
% of VOUT
V
µA
65
45
42
dB
145
°C
12
°C
250
µVrms
22
ppm/°C
1. VDO is defined as VIN - VOUT when VOUT is 98% of nominal.
2. For VOUT < 2.3V, VDO = 2.5V - VOUT.
3. CIN = 10µF.
4
3216.2006.01.1.3
AAT3216
150mA MicroPower™ LDO with PowerOK
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Dropout Characteristics
Dropout Voltage vs. Temperature
3.00
IL = 150mA
Output Voltage (V)
Dropout Voltage (mV)
3.20
260
240
220
200
180
160
140
120
100
80
60
40
20
0
IL = 100mA
IL = 50mA
-40 -30 -20 -10 0
IOUT = 0mA
2.80
IOUT = 10mA
2.60
IOUT = 50mA
2.40
IOUT = 100mA
IOUT = 150mA
2.20
2.00
2.70
10 20 30 40 50 60 70 80 90 100 110 120
2.80
2.90
Temperature (°C)
3.00
3.10
3.20
Input Voltage (V)
Ground Current vs. Input Voltage
Dropout Voltage vs. Output Current
90.00
80.00
Ground Current (µA)
Dropout Voltage (mV)
300
250
200
85°C
150
100
25°C
-40°C
50
70.00
60.00
50.00
IOUT = 150mA
40.00
IOUT = 50mA
IOUT = 0mA
30.00
IOUT = 10mA
20.00
10.00
0
0.00
0
25
50
75
100
125
150
2
2.5
3
4
4.5
5
Output Voltage vs. Temperature
Quiescent Current vs. Temperature
1.203
100
90
1.202
80
Output Voltage (V)
Quiescent Current (µA)
3.5
Input Voltage (V)
Output Current (mA)
70
60
50
40
30
20
10
0
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
3216.2006.01.1.3
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
Temperature (°C)
5
AAT3216
150mA MicroPower™ LDO with PowerOK
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Turn-Off Time with POK Delay
Turn-On Time and POK Delay
VENABLE (2V/div)
VEN (2V/div)
VOUT (500mV/div)
VPOK (2V/div)
VPOK (500mV/div)
VOUT (2V/div)
Time (200µs/div)
Time (10µs/div)
Line Transient Response
Load Transient Response
500
2.90
3.25
Input Voltage (V)
4
3.15
3
3.10
2
3.05
1
3.00
VOUT
0
2.95
-1
2.90
-2
2.85
Output Voltage (V)
3.20
2.85
400
VOUT
2.80
300
2.75
200
2.70
100
2.65
0
IOUT
2.60
Output Current (mA)
VIN
5
Output Voltage (V)
6
-100
Time (100µs/div)
Time (100µs/div)
Over-Current Protection
POK Output Response
1200
VIN (2V/div)
Output Current (mA)
1000
800
VOUT (2V/div)
600
400
200
0
VPOK (1V/div)
-200
Time (20ms/div)
6
Time (200µs/div)
3216.2006.01.1.3
AAT3216
150mA MicroPower™ LDO with PowerOK
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
VEN(H) and V EN(L) vs. VIN
10
1.250
1.225
1.200
1
VEN (V)
Noise Amplitude (µV/rtHz)
AAT3216 Self Noise
0.1
1.175
VEN(H)
1.150
1.125
VEN(L)
1.100
1.075
0.01
0.01
1.050
2.5
0.1
1
10
Frequency (kHz)
3216.2006.01.1.3
100
3.0
3.5
4.0
4.5
5.0
5.5
1000
VIN (V)
7
AAT3216
150mA MicroPower™ LDO with PowerOK
Functional Block Diagram
IN
OUT
Over-Current
Protection
Over-Temperature
Protection
Error
Amplifier
EN
POK
Voltage
Reference
94%
GND
Functional Description
The AAT3216 is intended for LDO regulator applications where output current load requirements
range from no load to 150mA.
The advanced circuit design of the AAT3216 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.
The AAT3216 has an integrated Power-OK comparator which indicates when the output is out of
regulation.
8
The device enable circuit is provided to shut down
the LDO regulator for power conservation in portable
products. The enable circuit has an additional output capacitor discharge circuit to assure sharp application circuit turn-off upon device shutdown.
This LDO regulator has complete short-circuit and
thermal protection. The integral combination of
these two internal protection circuits gives the
AAT3216 a comprehensive 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
current loads.
3216.2006.01.1.3
AAT3216
150mA MicroPower™ LDO with PowerOK
Applications Information
To assure the maximum possible performance is
obtained from the AAT3216, please refer to the following application 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 AAT3216 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
150mA 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.
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 AAT3216 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 AAT3216 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.
3216.2006.01.1.3
Capacitor Characteristics
Ceramic composition capacitors are highly recommended over all other types of capacitors for use
with the AAT3216. 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. Large ceramic capacitors (i.e., greater
than 2.2µF) are often available in low-cost Y5V and
Z5U dielectrics. 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%.
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.
9
AAT3216
150mA MicroPower™ LDO with PowerOK
POK Output
The AAT3216 features an integrated Power-OK
comparator 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 or IN. A
delayed POK signal can be implemented with a
capacitor in parallel with the pull-up resistor.
LDO regulator to withstand indefinite short-circuit
conditions without sustaining permanent damage.
No-Load Stability
The AAT3216 is designed to maintain output voltage regulation and stability under operational noload conditions. This is an important characteristic
for applications where the output current may drop
to zero.
Enable Function
The AAT3216 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 shutdown 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 regulator in a
continuously on state.
When the LDO regulator is in the shutdown mode,
an internal 1.5kΩ resistor is connected between
VOUT and GND. This is intended to discharge COUT
when the LDO regulator is disabled. The internal
1.5kΩ has no adverse effect on device turn-on time.
Short-Circuit Protection
The AAT3216 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 current limited until the short-circuit
condition is removed from the output or LDO regulator package power dissipation exceeds the
device thermal limit.
Thermal Protection
The AAT3216 has an internal thermal protection circuit which will turn on when the device die temperature exceeds 150°C. The internal thermal protection circuit will actively turn off the LDO regulator
output pass device to prevent the possibility of overtemperature damage. The LDO regulator output
will remain in a shutdown state until the internal die
temperature falls back below the 150°C trip point.
The combination and interaction between the shortcircuit and thermal protection systems allows the
10
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.
Thermal Considerations and High
Output Current Applications
The AAT3216 is designed to deliver a continuous
output load current of 150mA under normal operating conditions.
The limiting characteristic for the maximum output
load current safe operating area is essentially
package power dissipation and the internal preset
thermal limit of the device. In order to obtain high
operating currents, careful device layout and circuit
operating conditions must be taken into account.
3216.2006.01.1.3
AAT3216
150mA MicroPower™ LDO with PowerOK
The following discussions will assume the LDO regulator is mounted on a printed circuit board utilizing
the minimum recommended footprint as stated in
the Layout Considerations section of this document.
At any given ambient temperature (TA), the maximum package power dissipation can be determined by the following equation:
PD(MAX) =
TJ(MAX) - TA
θJA
Constants for the AAT3216 are TJ(MAX), the maximum junction temperature for the device which is
125°C, and ΘJA = 190°C/W, the package thermal
resistance. Typically, maximum conditions are calculated at the maximum operating temperature
where TA = 85°C, under normal ambient conditions
TA = 25°C. Given TA = 85°C, the maximum package power dissipation is 211mW. At TA = 25°C, the
maximum package power dissipation is 526mW.
VIN(MAX) =
PD(MAX) + (VOUT × IOUT)
IOUT + IGND
The following is an example for an AAT3216 set for
a 2.5V output:
VOUT
= 2.5V
IOUT
= 150mA
IGND
= 150µA
VIN(MAX) =
526mW + (2.5V × 150mA)
150mA + 150µA
VIN(MAX) = 6.00V
From the discussion above, PD(MAX) was determined to equal 526mW at TA = 25°C.
The maximum continuous output current for the
AAT3216 is a function of the package power dissipation and the input-to-output voltage drop across
the LDO regulator. Refer to the following simple
equation:
Thus, the AAT3216 can sustain a constant 2.5V output at a 150mA load current as long as VIN is ≤ 6.00V
at an ambient temperature of 25°C. 6.0V is the
absolute maximum voltage where an AAT3216
would never be operated, thus at 25°C, the device
would not have any thermal concerns or operational
VIN(MAX) limits.
PD(MAX)
IOUT(MAX) <
VIN - VOUT
This situation can be different at 85°C. The following is an example for an AAT3216 set for a 2.5V
output at 85°C:
For example, if VIN = 5V, VOUT = 3V, and TA = 25°C,
IOUT(MAX) < 264mA. If the output load current were
to exceed 264mA or if the ambient temperature
were to increase, the internal die temperature
would increase. If the condition remained constant, the LDO regulator thermal protection circuit
would activate.
To determine the maximum input voltage for a
given load current, refer to the following equation.
This calculation accounts for the total power dissipation of the LDO regulator, including that caused
by ground current.
PD(MAX) = (VIN - VOUT)IOUT + (VIN x IGND)
This formula can be solved for VIN to determine the
maximum input voltage.
3216.2006.01.1.3
VOUT
= 2.5V
IOUT
= 150mA
IGND
= 150µA
VIN(MAX) =
211mW + (2.5V × 150mA)
150mA + 150µA
VIN(MAX) = 3.90V
From the discussion above, PD(MAX) was determined to equal 211mW at TA = 85°C.
Higher input-to-output voltage differentials can be
obtained with the AAT3216, while maintaining
device functions within the thermal safe operating
area. To accomplish this, the device thermal
resistance must be reduced by increasing the heat
11
AAT3216
150mA MicroPower™ LDO with PowerOK
sink area or by operating the LDO regulator in a
duty-cycled mode.
(VOUT = 2.5V @ 25°C)
3.5
Voltage Drop (V)
For example, an application requires VIN = 4.2V
while VOUT = 2.5V at a 150mA load and TA = 85°C.
VIN is greater than 3.90V, which is the maximum
safe continuous input level for VOUT = 2.5V at
150mA for TA = 85°C. To maintain this high input
voltage and output current level, the LDO regulator
must be operated in a duty-cycled mode. Refer to
the following calculation for duty-cycle operation:
Device Duty Cycle vs. VDROP
3
2.5
200mA
2
1.5
1
0.5
0
0
IGND = 150µA
IOUT
= 150mA
VIN
= 4.2V
10
30
40
50
60
70
80
90
100
Duty Cycle (%)
Device Duty Cycle vs. VDROP
VOUT = 2.5V
(VOUT = 2.5V @ 50°C)
PD(MAX)
(VIN - VOUT)IOUT + (VIN × IGND)
211mW
%DC = 100
(4.2V - 2.5V)150mA + (4.2V × 150µA)
%DC = 85.54%
3.5
Voltage Drop (V)
%DC = 100
20
3
2.5
200mA
2
150mA
1.5
1
0.5
0
PD(MAX) was assumed to be 211mW.
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
For a 150mA output current and a 2.7V drop across
the AAT3216 at an ambient temperature of 85°C,
the maximum on-time duty cycle for the device
would be 85.54%.
Device Duty Cycle vs. VDROP
The following family of curves show the safe operating area for duty-cycled operation from ambient
room temperature to the maximum operating level.
(VOUT = 2.5V @ 85°C)
Voltage Drop (V)
3.5
100mA
3
2.5
2
200mA
1.5
150mA
1
0.5
0
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
12
3216.2006.01.1.3
AAT3216
150mA MicroPower™ LDO with PowerOK
High Peak Output Current Applications
Some applications require the LDO regulator to
operate at continuous nominal level with short
duration, high-current peaks. The duty cycles for
both output current levels must be taken into
account. To do so, one would first need to calculate the power dissipation at the nominal continuous level, then factor in the additional power dissipation due to the short duration, high-current
peaks.
For example, a 2.5V system using a AAT3216IGV2.5-T1 operates at a continuous 100mA load current level and has short 150mA current peaks. The
current peak occurs for 378µs out of a 4.61ms period. It will be assumed the input voltage is 4.2V.
First, the current duty cycle in percent must be
calculated:
% Peak Duty Cycle: X/100 = 378µs/4.61ms
% Peak Duty Cycle = 8.2%
The LDO regulator will be under the 100mA load
for 91.8% of the 4.61ms period and have 150mA
peaks occurring for 8.2% of the time. Next, the
continuous nominal power dissipation for the
100mA load should be determined then multiplied
by the duty cycle to conclude the actual power dissipation over time.
3216.2006.01.1.3
PD(MAX) = (VIN - VOUT)IOUT + (VIN x IGND)
PD(100mA) = (4.2V - 2.5V)100mA + (4.2V x 150µA)
PD(100mA) = 170.6mW
PD(91.8%D/C) = %DC x PD(100mA)
PD(91.8%D/C) = 0.918 x 170.6mW
PD(91.8%D/C) = 156.6mW
The power dissipation for 100mA load occurring for
91.8% of the duty cycle will be 156.6mW. Now the
power dissipation for the remaining 8.2% of the
duty cycle at the 150mA load can be calculated:
PD(MAX) = (VIN - VOUT)IOUT + (VIN x IGND)
PD(150mA) = (4.2V - 2.5V)150mA + (4.2V x 150mA)
PD(150mA) = 255.6mW
PD(8.2%D/C) = %DC x PD(150mA)
PD(8.2%D/C) = 0.082 x 255.6mW
PD(8.2%D/C) = 21mW
The power dissipation for 150mA load occurring for
8.2% of the duty cycle will be 21mW. Finally, the
two power dissipation levels can summed to determine the total true power dissipation under the varied load.
PD(total) = PD(100mA) + PD(150mA)
PD(total) = 156.6mW + 21mW
PD(total) = 177.6mW
The maximum power dissipation for the AAT3216
operating at an ambient temperature of 85°C is
211mW. The device in this example will have a total
power dissipation of 177.6mW. This is well within
the thermal limits for safe operation of the device.
13
AAT3216
150mA MicroPower™ LDO with PowerOK
Ordering Information
Output Voltage
Package
Marking1
Part Number (Tape and Reel)2
1.2V
SOT23-5
EAXYY
AAT3216IGV-1.2-T1
1.5V
SOT23-5
KJXYY
AAT3216IGV-1.5-T1
1.8V
SOT23-5
AAT3216IGV-1.8-T1
2.0V
SOT23-5
AAT3216IGV-2.0-T1
2.3V
SOT23-5
AAT3216IGV-2.3-T1
2.5V
SOT23-5
2.7V
SOT23-5
2.8V
SOT23-5
2.85V
SOT23-5
AAT3216IGV-2.85-T1
3.0V
SOT23-5
AAT3216IGV-3.0-T1
3.3V
SOT23-5
HQXYY
AAT3216IGV-3.3-T1
3.5V
SOT23-5
IYXYY
AAT3216IGV-3.5-T1
1.2V
SC70JW-8
AAT3216IJS-1.2-T1
1.5V
SC70JW-8
AAT3216IJS-1.5-T1
1.8V
SC70JW-8
AAT3216IJS-1.8-T1
2.0V
SC70JW-8
AAT3216IJS-2.0-T1
2.3V
SC70JW-8
AAT3216IJS-2.3-T1
2.5V
SC70JW-8
AAT3216IJS-2.5-T1
2.7V
SC70JW-8
AAT3216IJS-2.7-T1
2.8V
SC70JW-8
AAT3216IJS-2.8-T1
2.85V
SC70JW-8
AAT3216IJS-2.85-T1
3.0V
SC70JW-8
KGXYY
AAT3216IJS-3.0-T1
3.3V
SC70JW-8
HQXYY
AAT3216IJS-3.3-T1
3.5V
SC70JW-8
KKXYY
AAT3216IGV-2.5-T1
AAT3216IGV-2.7-T1
ELXYY
AAT3216IGV-2.8-T1
AAT3216IJS-3.5-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
14
3216.2006.01.1.3
AAT3216
150mA MicroPower™ LDO with PowerOK
Package Information
SOT23-5
2.85 ± 0.15
1.90 BSC
10° ± 5°
0.40 ± 0.10
0.075 ± 0.075
0.15 ± 0.07
4° ± 4°
1.10 ± 0.20
0.60 REF
1.20 ± 0.25
2.80 ± 0.20
1.575 ± 0.125
0.95
BSC
GAUGE PLANE
0.45 ± 0.15
0.60 REF
0.10 BSC
SC70JW-8
2.20 ± 0.20
1.75 ± 0.10
0.50 BSC 0.50 BSC 0.50 BSC
0.225 ± 0.075
2.00 ± 0.20
0.100
7° ± 3°
0.45 ± 0.10
4° ± 4°
0.05 ± 0.05
0.15 ± 0.05
1.10 MAX
0.85 ± 0.15
0.048REF
2.10 ± 0.30
All dimensions in millimeters
3216.2006.01.1.3
15
AAT3216
150mA MicroPower™ LDO with PowerOK
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights,
or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice.
Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold
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830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
16
3216.2006.01.1.3
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