AAT2506_202019B.pdf

DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
General Description
Features
The AAT2506 is a member of Skyworks' Total Power
Management IC (TPMIC™) product family. It is a low
dropout (LDO) linear regulator and a step-down converter with an input voltage range of 2.7V to 5.5V, making it ideal for applications with single lithium-ion/polymer batteries.
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The LDO has an independent input and is capable of
delivering up to 300mA. The linear regulator has been
designed for high-speed turn-on and turn-off performance, fast transient response, and good power supply
rejection ratio (PSRR). Other features include low quiescent current and a low dropout voltage.
The AAT2506 is available in either a fixed version with
internal feedback or a programmable version with external feedback resistors. It can deliver 600mA of load current while maintaining a low 25μA no load quiescent
current. The 1MHz switching frequency minimizes the
size of external components while keeping switching
losses low. The AAT2506 feedback and control delivers
excellent load regulation and transient response with a
small output inductor and capacitor.
The AAT2506 is designed to maintain high efficiency
throughout the operating range, which is critical for portable applications.
The AAT2506 is available in a 12-pin TDFN33 package,
and is rated over a temperature range of -40°C to
+85°C.
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VIN Range: 2.7V to 5.5V
VOUT Range: 0.6V to VIN
300mA LDO Current Output
400mV LDO Dropout Voltage at 300mA
High Output Accuracy: ±1.5%
Fast LDO Line / Load Transient Response
600mA, 97% Efficiency Step-Down Converter
Fast Turn-On Time (100μs Typical)
25μA No Load Quiescent Current for Step-Down
Converter
Shutdown Current <1μA
Low RDS(ON) 0.4 Integrated Power Switches
100% Duty Cycle Low Dropout Operation
1MHz Switching Frequency
100μs Typical Soft Start
Over-Temperature Protection
Current Limit Protection
Available in TDFN33-12 Package
-40°C to +85°C Temperature Range
Applications
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Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor/DSP Core/IO Power
PDAs and Handheld Computers
Portable Media Players
Typical Application
VIN = 2.7V to 5.5V
AAT2506 Step-Down Converter Efficiency
3
5
3.3V at 300mA
9
6
7
8
C4
2.2μF
C5
VP
VCC
VLDO
EN
ENLDO
LX
OUT
FB
BYP
SGND
GND
PGND
(VOUT = 2.5V; L = 10μ
μH)
4
100
10
L1
2
4.7μH
11
12
1
U1
AAT2506
C1
22μF
Efficiency (%)
C3
10μF
90
VIN = 3.3V
80
70
10nF
60
0.1
L1 Sumida CDRH3D16-4R7 C1 Murata GRM219R61A475KE19
C3 Murata GRM21BR60J106KE19
1
10
100
1000
Output Current (mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
1
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Pin Descriptions
Pin #
Symbol
1
PGND
2
3
4
5
6
LX
VP
VCC
VLDO
OUT
7
BYP
8
9
10
GND
ENLDO
EN
11
FB
12
SGND
EP
Function
Step-down converter power ground return pin. Connect to the output and input capacitor return. See section on PCB layout guidelines and evaluation board layout diagram.
Power switching node. Output switching node that connects to the output inductor.
Step-down converter power stage supply voltage. Must be closely decoupled to PGND.
Step-down converter bias supply. Connect to VP.
LDO input voltage; should be decoupled with 1μF or greater capacitor.
300mA LDO output pin. A 2.2μF or greater output low-ESR ceramic capacitor is required for stability.
Bypass capacitor for the LDO. To improve AC ripple rejection, connect a 10nF capacitor to GND. This will
also provide a soft-start function.
LDO ground connection pin.
Enable pin for LDO. When connected low, LDO is disabled and consumes less than 1μA of current.
Step-down converter enable. When connected low, LDO is disabled and consumes less than 1μA.
Step-down converter feedback input pin. For fixed output voltage versions, this pin is connected to the
converter output, forcing the converter to regulate to the specific voltage. For adjustable output versions,
an external resistive divider ties to this point and programs the output voltage to the desired value.
Step-down converter signal ground. For external feedback, return the feedback resistive divider to this
ground. For internal fixed version, tie to the point of load return. See section on PCB layout guidelines and
evaluation board layout diagram.
Exposed paddle (bottom). Use properly sized vias for thermal coupling to the ground plane. See section on
PCB layout guidelines.
Pin Configuration
TDFN33-12
(TopView)
PGND
LX
VP
VCC
VLDO
OUT
2
1
12
2
11
3
10
4
9
5
8
6
7
SGND
FB
EN
ENLDO
GND
BYP
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Absolute Maximum Ratings1
Symbol
VP, VLDO
VLX
VFB
VEN
TJ
TLEAD
Description
Input Voltages to GND
LX to GND
FB to GND
EN to GND
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
Units
6.0
-0.3 to VP + 0.3
-0.3 to VP + 0.3
-0.3 to 6.0
-40 to 150
300
V
V
V
V
°C
°C
Value
Units
2
50
W
°C/W
Thermal Information
Symbol
PD
JA
Description
Maximum Power Dissipation
Thermal Resistance2
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 an FR4 board with exposed paddle connected to ground plane.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
3
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Electrical Characteristics1
VIN = VLDO = VOUT(NOM) + 1V for VOUT options greater than 1.5V. VIN = VLDO = 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
VOUT
Output Voltage Tolerance
IOUT = 1mA to 300mA
VIN
Input Voltage
Min
Typ
Max
Units
LDO
VDO
VOUT/
VOUT*VIN
Dropout Voltage
IOUT = 300mA
Line Regulation
VIN = VOUT + 1V to 5V
VOUT(Line)
Dynamic Line Regulation
VOUT(Load)
IOUT
ISC
IQLDO
ISHDN
Dynamic Load Regulation
Output Current
Short-Circuit Current
LDO Quiescent Current
Shutdown Current
PSRR
TSD
THYS
eN
TC
3, 4
Power Supply Rejection Ratio
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Output Noise
Output Voltage Temperature Coefficient
TA = 25°C
TA = -40°C to
85°C
IOUT = 300mA, VIN = VOUT + 1V to VOUT + 2V,
TR/TF = 2μs
IOUT = 1mA to 300mA, TR <5μs
VOUT > 1.3V
VOUT < 0.4V
VIN = 5V, No Load, ENLDO = VIN
VIN = 5V; ENLDO = GND, EN = SGND = PGND
1kHz
IOUT = 10mA, CBYP = 10nF
10kHz
1MHz
eNBW = 300Hz to 50kHz
-1.5
1.5
-2.5
2.5
%
VOUT
+VDO2
5.5
V
600
mV
0.09
%/V
400
2.5
mV
60
mV
mA
mA
μA
μA
300
600
70
125
1.0
67
47
45
145
12
50
22
dB
°C
°C
μVRMS
ppm/°C
1. The AAT2506 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. To calculate the minimum LDO input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX), as long as VIN ≥ 2.5V.
3. For VOUT <2.1V, VDO = 2.5 - VOUT.
4. VDO is defined as VIN - VOUT when VOUT is 98% of nominal.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Electrical Characteristics1
Typical values are TA = 25°C, VIN = VCC = Vp = 3.6V.
Symbol
Description
Conditions
Buck Converter
VIN
Input Voltage
VUVLO
VOUT
VOUT
IQBUCK
UVLO Threshold
Output Voltage Tolerance
Output Voltage Range
Step-Down Converter Quiescent Current
ISHDN
Shutdown Current
ILIM
P-Channel Current Limit
RDS(ON)H
High Side Switch On Resistance
Low Side Switch On Resistance
RDS(ON)L
ILXLK
LX Leakage Current
ILXLK, R
LX Reverse Leakage Current (fixed)
VLinereg
Line Regulation
VFB
FB Threshold Voltage Accuracy
FB Leakage Current
IFB
FOSC
Oscillator Frequency
TS
Start-Up Time
TSD
Over-Temperature Shutdown Threshold
THYS
Over-Temperature Shutdown Hysteresis
Logic Signals
VEN(L)
Enable Threshold Low
VEN(H)
Enable Threshold High
IEN(H)
Leakage Current
Min
Typ
2.7
VIN Rising
Hysteresis
VIN Falling
IOUT = 0 to 400mA, VIN = 2.7V to 5.5V
Max
Units
5.5
2.6
V
V
mV
V
%
V
100
1.8
-3.5
0.6
25
ENLDO = GND, No Load, 0.6V Adjustable
Model
EN = SGND = PGND, ENLDO = GND
+3.5
VIN
50
1.0
600
0.45
0.40
VIN = 5.5V, VLX = 0 - VIN EN = SGND = PGND
VIN = Open, VLX = 5.5V, EN = SGND = PGND
VIN = 2.7V to 5.5V
0.6V Output, No Load, TA = 25°C
0.6V Output
TA = 25°C
From Enable to Output Regulation
591
600
0.7
1.0
100
140
15
1.0
1.0
0.5
609
0.2
1.5
0.6
1.5
1.0
1.0
μA
μA
mA


μA
μA
%/V
mV
μA
MHz
μs
°C
°C
V
V
μA
1. The AAT2506 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
5
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
LDO Dropout Voltage vs. Temperature
LDO Dropout Characteristics
(EN = GND; ENLDO = VIN)
(EN = GND; ENLDO = VIN)
3.20
IL = 300mA
480
420
Output Voltage (V)
Dropout Voltage (mV)
540
360
300
IL = 100mA
IL = 150mA
240
180
120
60
-40 -30 -20 -10 0
IOUT = 0mA
2.80
IOUT = 300mA
IOUT = 150mA
2.60
2.40
2.20
IL = 50mA
0
3.00
IOUT = 10mA
2.00
2.70
10 20 30 40 50 60 70 80 90 100 110 120
2.80
3.10
3.20
3.30
LDO Dropout Voltage vs. Output Current
LDO Ground Current vs. Input Voltage
(EN = GND; ENLDO = VIN)
90.00
Ground Current (μA)
450
Dropout Voltage (mV)
3.00
Input Voltage (V)
500
400
350
300
85°C
250
200
25°C
150
-40°C
100
80.00
70.00
60.00
IOUT=300mA
50.00
IOUT=150mA
IOUT=50mA
40.00
IOUT=0mA
30.00
IOUT=10mA
20.00
10.00
50
0
0.00
0
50
100
150
200
250
300
2
2.5
3
3.5
4
4.5
Input Voltage (V)
Output Current (mA)
Output Voltage Error (%)
2.90
Temperature (°C)
(EN = GND; ENLDO = VIN)
LDO Output Voltage Error vs. Temperature
LDO Initial Power-Up Response Time
(EN = GND; ENLDO = VIN)
(CBYP = 10nF; EN = GND; ENLDO = VIN)
VENLDO (5V/div)
0
0.25
0.5
-40 -30 -20 -10
0
10 20
30
40
50 60
Temperature (°C)
6
IOUT = 100mA
IOUT = 50mA
70 80
90 100
VOUT (1V/div)
400μ
μs/div
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
5
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C, VIN = VLDO = VCC = VP.
LDO Turn-Off Response Time
LDO Turn-On Time From Enable (VIN present)
(CBYP = 10nF; EN = GND; ENLDO = VIN)
(CBYP = 10nF; EN = GND; ENLDO = VIN)
VENLDO = 5V/div
VENLDO (5V/div)
VOUT (1V/div)
VIN = 4V
VOUT = 1V/div
50μs/div
μs/div
5μ
LDO Load Transient Response
LDO Line Transient Response
(CBYP = 10nF; EN = GND; ENLDO = VIN)
(CBYP = 10nF; EN = GND; ENLDO = VIN)
Input Voltage (V)
4
3.02
3
3.01
2
3.00
VOUT
1
2.99
0
2.98
2.85
400
VOUT
2.80
300
2.75
200
2.70
100
2.65
0
IOUT
2.60
-100
100μS/div
LDO Self Noise
(CBYP = 10nF; EN = GND; ENLDO = VIN)
(EN = GND; ENLDO = VIN)
800
2.90
700
2.80
2.70
600
VOUT
500
2.60
400
2.50
300
2.40
200
2.30
100
IOUT
2.20
0
2.10
-100
10μ
μs/div
Noise Amplitude (μV/rtHz)
LDO Load Transient Response 300mA
Output Current (mA)
Output Voltage (V)
100μs/div
3.00
Output Current (mA)
3.03
VIN
Output Voltage (V)
5
500
2.90
3.04
Output Voltage (V)
6
10
1
0.1
0.01
Band Power:
300Hz to 50kHz = 44.6μVrms
100Hz to 100kHz = 56.3μVrms
0.001
0.01
0.1
1
10
100
1000
10000
Frequency (kHz)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
7
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
LDO ENLDO vs. VIN
Over-Current Protection
(EN = GND; ENLDO = VIN)
1.250
Output Current (mA)
1200
1.225
1000
1.200
800
VIH
1.175
600
1.150
400
1.125
200
1.100
0
1.075
VIL
1.050
2.5
-200
3.0
3.5
Time (50ms/div)
Step-Down Converter Efficiency vs. Load
5.5
3.0
90
Output Error (%)
Efficiency (%)
5.0
(VOUT = 3.3V; L = 10μ
μH; ENLDO = GND)
100
VIN = 3.9V
VIN = 4.2V
80
70
2.0
VIN = 4.2V
1.0
0.0
-1.0
VIN = 3.9V
-2.0
-3.0
60
0.1
1
10
100
0.1
1000
1
Output Current (mA)
10
100
1000
Output Current (mA)
Step-Down Converter Efficiency vs. Load
Step-Down Converter DC Regulation
(VOUT = 2.5V; L = 10μ
μH; ENLDO = GND)
(VOUT = 2.5V; L = 10μ
μH; ENLDO = GND)
3.0
100
Output Error (%)
VIN = 3.3V
Efficiency (%)
4.5
Step-Down Converter DC Regulation
(VOUT = 3.3V; L = 10μ
μH; ENLDO = GND)
90
VIN = 3.0V
VIN = 3.6V
80
70
VIN = 3.3V
2.0
VIN = 3.6V
1.0
0.0
VIN = 3.0V
-1.0
-2.0
-3.0
60
0.1
1
10
Output Current (mA)
8
4.0
Input Voltage (V)
100
1000
0.1
1
10
100
Output Current (mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
1000
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Step-Down Converter Efficiency vs. Load
Step-Down Converter DC Regulation
(VOUT = 1.5V; L = 4.7μ
μH; ENLDO = GND)
(VOUT = 1.5V; L = 4.7μ
μH; ENLDO = GND)
100
3.0
VIN = 2.7V
VIN = 3.6V
80
Output Error (%)
Efficiency (%)
90
VIN = 4.2V
70
60
50
0.1
1
10
100
VIN = 4.2V
2.0
VIN = 3.6V
1.0
0.0
VIN = 2.7V
-1.0
-2.0
-3.0
1000
0.1
1
10
Output Current (mA)
Step-Down Converter
Frequency vs. Input Voltage
Step-Down Converter
Output Voltage Error vs. Temperature
(VOUT = 1.8V; EN = VIN; ENLDO = GND)
(VIN = 3.6V; VO = 1.5V; EN = VIN; ENLDO = GND)
2.0
0.5
Output Error (%)
Frequency Variation (%)
1000
Output Current (mA)
1.0
0.0
-0.5
-1.0
-1.5
-2.0
1.0
0.0
-1.0
-2.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
-40
-20
0
20
40
60
80
100
Temperature (°°C)
Input Voltage (V)
Step-Down Converter
Switching Frequency vs. Temperature
Step-Down Converter
Input Current vs. Input Voltage
(VIN = 3.6V; VO = 1.5V; EN = VIN; ENLDO = GND)
(VO = 1.8V; EN = VIN; ENLDO = GND)
35
Input Current (μ
μA)
0.20
Frequency Variation (%)
100
0.10
0.00
-0.10
85°C
30
25°C
25
20
-40°C
-0.20
-40
15
-20
0
20
40
Temperature (°°C)
60
80
100
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
9
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Step-Down Converter
P-Channel RDS(ON) vs. Input Voltage
Step-Down Converter
N-Channel RDS(ON) vs. Input Voltage
(EN = VIN; ENLDO = GND)
(EN = VIN; ENLDO = GND)
750
750
700
700
120°C
650
100°C
RDS(ON) (mΩ
Ω)
RDS(ON) (mΩ
Ω)
650
600
550
85°C
500
450
25°C
400
120°C
100°C
600
550
500
85°C
450
400
350
25°C
350
300
300
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
2.5
3.0
3.5
Input Voltage (V)
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Step-Down Converter Load Transient Response
(30mA - 300mA; VIN = 3.6V; VOUT = 1.5V;
μF; ENLDO = GND)
C1 = 22μ
(30mA - 300mA; VIN = 3.6V; VOUT = 2.5V;
μF; ENLDO = GND)
C1 = 22μ
1.3
1.1
300mA
30mA
0.9
0.7
0.5
0.3
0.1
-0.1
2.65
1.5
2.55
Output Voltage
(top) (V)
1.5
1.3
1.1
300mA
2.45
0.9
30mA
2.35
0.7
2.25
0.5
0.3
2.15
0.1
2.05
-0.1
Time (25μs/div)
Load and Inductor Current
(200mA/div) (bottom)
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
Load and Inductor Current
(200mA/div) (bottom)
Output Voltage
(top) (V)
Step-Down Converter Load Transient Response
Time (25μs/div)
Step-Down Converter Line Regulation
Step-Down Converter Line Transient
(VOUT = 1.5V; ENLDO = GND)
(VOUT = 1.8V @ 400mA; EN = VIN; ENLDO = GND)
7.0
1.85
6.5
1.80
6.0
1.75
5.5
1.70
5.0
1.65
4.5
1.60
4.0
1.55
3.5
1.50
3.0
Time (25μ
μs/div)
10
1.5
Accuracy (%)
1.90
Input Voltage
(bottom) (V)
Output Voltage
(top) (V)
2
IOUT = 600mA
1
0.5
IOUT = 100mA
0
IOUT = 10mA
-0.5
-1
2.5
3
3.5
4
4.5
5
Input Voltage (V)
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5.5
6
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Step-Down Converter Output Ripple
Step-Down Converter Soft Start
3.0
2.0
2.5
1.0
2.0
0.0
1.5
-1.0
1.0
-2.0
0.5
-3.0
0.0
-4.0
-0.5
Time (50μs/div)
Output Voltage (AC Coupled)
(top) (mV)
3.5
3.0
(VIN = 3.6V; VOUT = 1.8V; 400mA;
EN = VIN; ENLDO = GND)
40
0.9
20
0.8
0
0.7
-20
0.6
-40
0.5
-60
0.4
-80
0.3
-100
0.2
Inductor Current
(bottom) (A)
4.0
Inductor Current
(bottom) (A)
Enable and Output Voltage
(top) (V)
(VIN = 3.6V; VOUT = 1.5V; L = 4.7μ
μH; ENLDO = GND)
0.1
-120
Time (250ns/div)
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11
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Functional Block Diagram
VP
VCC
FB
Error
Amp.
DH
See
Note
LX
Logic
Voltage
Reference
Control
Logic
EN
DL
PGND
SGND
OUT
VLDO
Over-Current
Protection
Error
Amp.
Voltage
Reference
BYP
ENLDO
Fast Start
Control
GND
Note: Internal resistor divider included for ≥1.2V versions. For low voltage versions, the feedback pin is tied directly to the error amplifier input.
Functional Description
The AAT2506 is a high performance power management
IC comprised of a buck converter and a linear regulator.
The buck converter is a high efficiency converter capable
of delivering up to 600mA. Designed to operate at
1.0MHz, the converter requires only three external components (CIN, COUT, and LX) and is stable with a ceramic
output capacitor. The linear regulator delivers 300mA
and is also stable with ceramic capacitors.
Linear Regulator
The advanced circuit design of the linear regulator 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.
12
The high-speed turn-on capability is enabled through
implementation of a fast-start control circuit, which
accelerates the power-up behavior of fundamental control and feedback circuits within the LDO regulator. Fast
turn-off time response is achieved by an active output
pull-down circuit, which is enabled when the LDO regulator is placed in shutdown mode. This active fast shutdown circuit has no adverse effect on normal device
operation. 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.
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 regu-
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DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
lator turn-on time. The regulator comes with complete
short-circuit and thermal protection. The combination of
these two internal protection circuits gives a comprehensive safety system to guard against extreme adverse
operating conditions.
The regulator features an enable/disable function. This
pin (ENLDO) is active high and is compatible with CMOS
logic. To assure the LDO regulator will switch on, the
ENLDO turn-on control level must be greater than 1.5V.
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 regulator is in shutdown mode, an internal
1.5k resistor is connected between OUT and GND. This
is intended to discharge COUT when the LDO regulator is
disabled. The internal 1.5K resistor has no adverse
impact on device turn-on time.
Soft Start
The AAT2506 soft-start control prevents output voltage
overshoot and limits inrush current when either the input
power or the enable input is applied. When pulled low, the
enable input forces the converter into a low-power, nonswitching state with a bias current of less than 1μA.
Low Dropout Operation
For conditions where the input voltage drops to the output voltage level, the converter duty cycle increases to
100%. As 100% duty cycle is approached, the minimum
off-time initially forces the high side on-time to exceed
the 1MHz clock cycle and reduce the effective switching
frequency. Once the input drops below the level where
the output can be regulated, the high side P-channel
MOSFET is turned on continuously for 100% duty cycle.
At 100% duty cycle, the output voltage tracks the input
voltage minus the IR drop of the high side P-channel
MOSFET RDS(ON).
Step-Down Converter
Low Supply
The AAT2506 buck is a constant frequency peak current
mode PWM converter with internal compensation. It is
designed to operate with an input voltage range of 2.7V
to 5.5V. The output voltage ranges from 0.6V to the
input voltage. The 0.6V fixed model shown in Figure 1 is
also the adjustable version and is externally programmable with a resistive divider, as shown in Figure 2. The
converter MOSFET power stage is sized for 600mA load
capability with up to 97% efficiency. Light load efficiency
exceeds 80% at a 500μA load.
The under-voltage lockout (UVLO) guarantees sufficient
VIN bias and proper operation of all internal circuitry prior
to activation.
Fault Protection
For overload conditions, the peak inductor current is limited. Thermal protection disables switching when the
internal dissipation or ambient temperature becomes
excessive. The junction over-temperature threshold is
140°C with 15°C of hysteresis.
VIN
VIN
C3
10μF
3
5
9
VOUTLDO
6
7
8
C4
4.7μF
C5
10nF
VP
VCC
VLDO
EN
ENLDO
LX
OUT
BYP
GND
FB
SGND
PGND
4
C3
10μF
10
2
L1
3
VOUTBUCK
5
9
11
VOUTLDO
6
12
1
U1
AAT2506
Figure 1: AAT2506 Fixed Output.
7
C1
22μF
8
C4
4.7μF
C5
10nF
VP
VCC
VLDO
EN
ENLDO
LX
OUT
FB
BYP
SGND
GND
PGND
U1
AAT2506
4
10
2
VOUTBUCK
L1
R1
11
12
1
C8
100pF
R2
59k
C1
22μF
Figure 2: AAT2506 with Adjustable Step-Down
Output and Enhanced Transient Response.
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13
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Applications Information
Bypass Capacitor
and Low Noise Applications
Linear Regulator
A bypass capacitor pin is provided to enhance the low
noise characteristics of the LDO. The bypass capacitor is
not necessary for operation; however, for best device
performance, a small ceramic capacitor in the range of
470pF to 10nF should be placed between the bypass pin
(BYP) and the device ground pin (GND). 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.
Input and Output Capacitors
An input capacitor is not required for basic operation of
the linear regulator. However, if the AAT2506 is physically
located more than three centimeters from an input power
source, a CIN capacitor will be needed for stable operation.
Typically, a 1μF or larger capacitor is recommended for CIN
in most applications. CIN should be located as closely to
the device VIN pin as practically possible.
An input capacitor greater than 1μF will offer superior
input line transient response and maximize 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.
For proper load voltage regulation and operational stability, a capacitor is required between OUT and GND. The
COUT capacitor connection to the LDO regulator ground
pin should be made as directly as practically possible for
maximum device performance. Since the regulator has
been designed to function with very low ESR capacitors,
ceramic capacitors in the 1.0μF to 10μF range are recommended for best performance. Applications utilizing
the exceptionally low output noise and optimum power
supply ripple rejection should use 2.2μF or greater for
COUT. In low output current applications, where output
load is less than 10mA, the minimum value for COUT can
be as low as 0.47μF.
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.
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.
Step-Down Converter
Inductor Selection
The step-down converter uses peak current mode control
with slope compensation to maintain stability for duty
cycles greater than 50%. The output inductor value must
be selected so the inductor current down slope meets the
internal slope compensation requirements. The internal
slope compensation for the adjustable and low-voltage
fixed versions of the AAT2506 is 0.24A/μsec. This equates
to a slope compensation that is 75% of the inductor current down slope for a 1.5V output and 4.7μH inductor.
m=
0.75 ⋅ VO 0.75 ⋅ 1.5V
A
=
= 0.24
L
4.7μH
μsec
This is the internal slope compensation for the adjustable (0.6V) version or low-voltage fixed versions. When
externally programming the 0.6V version to 2.5V, the
calculated inductance is 7.5μH.
L=
0.75 ⋅ VO
=
m
=3
μsec
0.75 ⋅ VO
≈ 3 A ⋅ VO
A
0.24A μsec
μsec
⋅ 2.5V = 7.5μH
A
In this case, a standard 10μH value is selected.
For high-voltage fixed versions (2.5V and above), m =
0.48A/μsec. Table 1 displays inductor values for the
AAT2506 fixed and adjustable options.
14
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DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Configuration
0.6V Adjustable
With External
Resistive Divider
Fixed Output
Output
Voltage
0.6V to
2.0V
2.5V to
VIN
0.6V to
2.0V
2.5V to
VIN
Inductor
Slope
Compensation
4.7μH
0.24A/μsec
Always examine the ceramic capacitor DC voltage coefficient characteristics when selecting the proper value. For
example, the capacitance of a 10μF, 6.3V, X5R ceramic
capacitor with 5.0V DC applied is actually about 6μF.
10μH
0.24A/μsec
The maximum input capacitor RMS current is:
4.7μH
0.24A/μsec
4.7μH
0.48A/μsec
Table 1: Inductor Values.
Manufacturer’s specifications list both the inductor DC
current rating, which is a thermal limitation, and the
peak current rating, which is determined by the saturation characteristics. The inductor should not show any
appreciable saturation under normal load conditions.
Some inductors may meet the peak and average current
ratings yet result in excessive losses due to a high DCR.
Always consider the losses associated with the DCR and
its effect on the total converter efficiency when selecting
an inductor.
The 4.7μH CDRH3D16 series inductor selected from
Sumida has a 105m DCR and a 900mA DC current rating. At full load, the inductor DC loss is 17mW which gives
a 2.8% loss in efficiency for a 400mA, 1.5V output.
Input Capacitor
Select a 4.7μF to 10μF X7R or X5R ceramic capacitor for
the input. To estimate the required input capacitor size,
determine the acceptable input ripple level (VPP) and
solve for C. The calculated value varies with input voltage and is a maximum when VIN is double the output
voltage.
CIN =
VOBUCK ⎛ VOBUCK⎞
· 1⎝
VIN
VIN ⎠
⎛ VPP
⎞
- ESR · FS
⎝ IOBUCK
⎠
⎞ 1
VOBUCK ⎛
V
· 1 - OBUCK = for VIN = 2 × VOBUCK
⎝
VIN
VIN ⎠ 4
CIN(MIN) =
1
⎛ VPP
⎞
- ESR · 4 · FS
⎝ IOBUCK
⎠
IRMS = IOBUCK ·
⎞
VOBUCK ⎛
V
· 1 - OBUCK
⎝
VIN
VIN ⎠
The input capacitor RMS ripple current varies with the
input and output voltage and will always be less than or
equal to half of the total DC load current.
VOBUCK ⎛ VOBUCK⎞
· 1=
⎝
VIN
VIN ⎠
D · (1 - D) =
0.52 =
1
2
for VIN = 2 x VOBUCK
IRMS(MAX) =
VOBUCK
IOBUCK
2
⎛
⎞
V
· 1 - OBUCK
VIN ⎠ appears in both the input voltThe term VIN ⎝
age ripple and input capacitor RMS current equations
and is a maximum when VOBUCK is twice VIN. This is why
the input voltage ripple and the input capacitor RMS current ripple are a maximum at 50% duty cycle.
The input capacitor provides a low impedance loop for
the edges of pulsed current drawn by the AAT2500. Low
ESR/ESL X7R and X5R ceramic capacitors are ideal for
this function. To minimize stray inductance, the capacitor
should be placed as closely as possible to the IC. This
keeps the high frequency content of the input current
localized, minimizing EMI and input voltage ripple.
The proper placement of the input capacitor (C2) can be
seen in the evaluation board layout in Figure 3.
A laboratory test set-up typically consists of two long
wires running from the bench power supply to the evaluation board input voltage pins. The inductance of these
wires, along with the low-ESR ceramic input capacitor,
can create a high Q network that may affect converter
performance. This problem often becomes apparent in
the form of excessive ringing in the output voltage during load transients. Errors in the loop phase and gain
measurements can also result.
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15
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Since the inductance of a short PCB trace feeding the
input voltage is significantly lower than the power leads
from the bench power supply, most applications do not
exhibit this problem.
In applications where the input power source lead inductance cannot be reduced to a level that does not affect
the converter performance, a high ESR tantalum or aluminum electrolytic should be placed in parallel with the
low ESR, ESL bypass ceramic. This dampens the high Q
network and stabilizes the system.
Output Capacitor
The output capacitor limits the output ripple and provides holdup during large load transitions. A 22μF X5R or
X7R ceramic capacitor typically provides sufficient bulk
capacitance to stabilize the output during large load
transitions and has the ESR and ESL characteristics necessary for low output ripple.
The output voltage droop due to a load transient is
dominated by the capacitance of the ceramic output
capacitor. During a step increase in load current, the
ceramic output capacitor alone supplies the load current
until the loop responds. Within two or three switching
cycles, the loop responds and the inductor current
increases to match the load current demand. The relationship of the output voltage droop during the three
Figure 3: AAT2506 Evaluation Board Top Side.
16
switching cycles to the output capacitance can be estimated by:
IRMS(MAX) =
1
VOUT · (VIN(MAX) - VOUT)
L · F · VIN(MAX)
2· 3
·
Once the average inductor current increases to the DC
load level, the output voltage recovers. The above equation establishes a limit on the minimum value for the
output capacitor with respect to load transients.
The internal voltage loop compensation also limits the
minimum output capacitor value to 22μF. This is due to
its effect on the loop crossover frequency (bandwidth),
phase margin, and gain margin. Increased output capacitance will reduce the crossover frequency with greater
phase margin.
The maximum output capacitor RMS ripple current is
given by:
⎛ VOUT ⎞
⎛ 1.5V ⎞
R1 = V
-1 · R2 = 0.6V - 1 · 59kΩ = 88.5kΩ
⎝ REF ⎠
⎝
⎠
Dissipation due to the RMS current in the ceramic output
capacitor ESR is typically minimal, resulting in less than
a few degrees rise in hot-spot temperature.
Figure 4: AAT2506 Evaluation Board
Bottom Side.
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DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Adjustable Output Resistor Selection
For applications requiring an adjustable output voltage,
the 0.6V version can be externally programmed. Resistors
R1 and R2 of Figure 5 program the output to regulate at
a voltage higher than 0.6V. To limit the bias current
required for the external feedback resistor string while
maintaining good noise immunity, the minimum suggested value for R2 is 59k. Although a larger value will
further reduce quiescent current, it will also increase the
impedance of the feedback node, making it more sensitive to external noise and interference. Table 2 summarizes the resistor values for various output voltages with
R2 set to either 59k for good noise immunity or 221k
for reduced no load input current.
PTOTAL =
The AAT2506, combined with an external feedforward
capacitor (C8 in Figures 2 and 5), delivers enhanced
transient response for extreme pulsed load applications.
The addition of the feedforward capacitor typically
requires a larger output capacitor C1 for stability.
VOUT (V)
R2 = 59kΩ
R1 (kΩ)
R2 = 221kΩ
R1 (kΩ)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
267
75
113
150
187
221
261
301
332
442
464
523
715
1000
IOBUCK2 · (RDSON(HS) · VOBUCK + RDSON(LS) · [VIN - VOBUCK])
VIN
+ (tsw · F · IOBUCK + IQBUCK + IQLDO) · VIN + IOLDO · (VIN - VOLDO)
Table 2: Adjustable Resistor Values For Use
With 0.6V Step-Down Converter.
LX1
VOUTBUCK
C7
0.01μF
C1
22μF1
C2
10μF
U1
VIN1
3
4
3
2
1
5
6
LDO Input
C3
10μF
R1
Table 3
AAT2506
1
2
L1
Table 3
C9
n/a
PGND
SGND
LX
FB
VP
EN
VCC
ENLDO
IN
GND
OUT
BYP
C4
4.7μF
12
11
C81
R2
59k
10
9
8
7
C5
10nF
3
2
1
Buck Enable
3
2
1
LDO Enable
GND
GND
VOUTLDO
Figure 5: AAT2506 Evaluation Board Schematic.
1. For step-down converter, enhanced transient configuration C8 = 100pF and C1 = 10uF.
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17
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Thermal Calculations
There are three types of losses associated with the
AAT2506 step-down converter: switching losses, conduction losses, and quiescent current losses. Conduction
losses are associated with the RDS(ON) characteristics of
the power output switching devices. Switching losses are
dominated by the gate charge of the power output
switching devices. At full load, assuming continuous conduction mode (CCM), a simplified form of the step-down
converter and LDO losses is given by:
TJ(MAX) = PTOTAL · ΘJA + TAMB
PCB Layout
The following guidelines should be used to ensure a
proper layout.
1.
2.
2
PTOTAL =
IOBUCK · (RDSON(HS) · VOBUCK + RDSON(LS) · [VIN - VOBUCK])
VIN
+ (tsw · F · IOBUCK + IQBUCK + IQLDO) · VIN + IOLDO · (VIN - VOLDO)
3.
IQBUCK is the step-down converter quiescent current and
IQLDO is the LDO quiescent current. The term tsw is used
to estimate the full load step-down converter switching
losses.
For the condition where the buck converter is in dropout
at 100% duty cycle, the total device dissipation reduces
to:
4.
PTOTAL = IOBUCK2 · RDSON(HS) + IOLDO · (VIN - VOLDO)
+ (IQBUCK + IQLDO) · VIN
Since RDS(ON), quiescent current, and switching losses all
vary with input voltage, the total losses should be investigated over the complete input voltage range.
Given the total losses, the maximum junction temperature can be derived from the JA for the TDFN33-12 package which is 50°C/W.
18
5.
6.
The input capacitor C2 should connect as closely as
possible to VP and PGND, as shown in Figure 4.
The output capacitor and inductor should be connected as closely as possible. The connection of the
inductor to the LX pin should also be as short as
possible.
The feedback trace should be separate from any
power trace and connect as closely as possible to the
load point. Sensing along a high-current load trace
will degrade DC load regulation. If external feedback
resistors are used, they should be placed as closely
as possible to the FB pin. This prevents noise from
being coupled into the high impedance feedback
node.
The resistance of the trace from the load return to
GND should be kept to a minimum. This will help to
minimize any error in DC regulation due to differences in the potential of the internal signal ground
and the power ground.
For good thermal coupling, PCB vias are required
from the pad for the TDFN paddle to the ground
plane. The via diameter should be 0.3mm to 0.33mm
and positioned on a 1.2mm grid.
LDO bypass capacitor (C5) should be connected
directly between pins 7 (BYP) and 8 (GND).
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DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Step-Down Converter Design Example
Specifications
VOBUCK = 1.8V @ 400mA (adjustable using 0.6V version), Pulsed Load ILOAD = 300mA
VOLDO = 3.3V @ 300mA
VIN = 2.7V to 4.2V (3.6V nominal)
FS = 1.0MHz
TAMB = 85°C
1.8V Buck Output Inductor
L1 = 3
μsec
μsec
⋅ VO2 = 3
⋅ 1.8V = 5.4μH (see Table 1)
A
A
For Sumida inductor CDRH3D16, 4.7μH, DCR = 105m.
⎛ 1.8V ⎞
VOBUCK ⎛ VOBUCK⎞
1.8V
⋅ 1=
⋅ 1= 218mA
L1 ⋅ F ⎝
VIN ⎠ 4.7μH ⋅ 1.0MHz ⎝ 4.2V⎠
ΔIL1 =
IPKL1 = IOBUCK +
ΔIL1
= 0.4A + 0.11A = 0.51A
2
PL1 = IOBUCK2 ⋅ DCR = 0.4A2 ⋅ 105mΩ = 17mW
1.8V Output Capacitor
VDROOP = 0.05V
COUT =
3 · ΔILOAD
3 · 0.3A
=
= 18μF
VDROOP · FS
0.05V · 1MHz
IRMS =
(VOBUCK) · (VIN(MAX) - VOBUCK)
1
1.8V · (4.2V - 1.8V)
·
= 63mArms
=
L1 · F · VIN(MAX)
2 · 3 4.7μH · 1.0MHz · 4.2V
2· 3
1
·
Pesr = esr · IRMS2 = 5mΩ · (63mA)2 = 20μW
Input Capacitor
Input Ripple VPP = 25mV
CIN =
IRMS =
1
⎛ VPP
⎞
- ESR · 4 · FS
⎝ IOBUCK
⎠
=
1
= 4.75μF
⎛ 25mV
⎞
- 5mΩ · 4 · 1MHz
⎝ 0.4A
⎠
IOBUCK
= 0.2Arms
2
P = esr · IRMS2 = 5mΩ · (0.2A)2 = 0.2mW
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19
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
AAT2506 Losses
PTOTAL =
IOBUCK2 · (RDSON(HS) · VOBUCK + RDSON(LS) · [VIN - VOBUCK])
VIN
+ (tsw · F · IOBUCK + IQBUCK + IQLDO) · VIN + (VIN - VLDO) · ILDO
=
0.42 · (0.725Ω · 1.8V + 0.7Ω · [4.2V - 1.8V])
4.2V
+ (5ns · 1.0MHz · 0.4A + 50μA +125μA) · 4.2V + (4.2V - 3.3V) · 0.3A = 392mW
TJ(MAX) = TAMB + ΘJA • PLOSS = 85°C + (50°C/W) • 392mW = 105°C
20
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
VOUT (V)
Adjustable Version
(0.6V device)
R1 (kΩ)
R2 = 59kΩ
R1 (kΩ)
R2 = 221kΩ1
L1 (μH)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
267
75.0
113
150
187
221
261
301
332
442
464
523
715
1000
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7 or 6.8
10
10
VOUT (V)
Fixed Version
R1 (kΩ)
R2 Not Used
L1 (μH)
0.6-3.3V
0
4.7
Table 3: Evaluation Board Component Values.
Manufacturer
Part Number
Inductance
(μH)
Sumida
Sumida
Murata
Murata
Murata
Coilcraft
Coilcraft
Coiltronics
Coiltronics
Coiltronics
Coiltronics
CDRH3D16-4R7
CDRH3D16-100
LQH32CN4R7M23
LQH32CN4R7M33
LQH32CN4R7M53
LPO6610-472
LPO3310-472
SDRC10-4R7
SDR10-4R7
SD3118-4R7
SD18-4R7
4.7
10
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
Max DC
Current
(A)
DCR
(Ω)
Size (mm)
LxWxH
Type
0.90
0.55
0.45
0.65
0.65
1.10
0.80
1.53
1.30
0.98
1.77
0.11
0.21
0.20
0.15
0.15
0.20
0.27
0.117
0.122
0.122
0.082
4.0x4.0x1.8
4.0x4.0x1.8
2.5x3.2x2.0
2.5x3.2x2.0
2.5x3.2x1.55
5.5x6.6x1.0
3.3x3.3x1.0
4.5x3.6x1.0
5.7x4.4x1.0
3.1x3.1x1.85
5.2x5.2x1.8
Shielded
Shielded
Non-Shielded
Non-Shielded
Non-Shielded
1mm
1mm
1mm Shielded
1mm Shielded
Shielded
Shielded
Table 4: Typical Surface Mount Inductors.
Manufacturer
Part Number
Value
Voltage
Temp. Co.
Case
Murata
TDK
Taiyo Yuden
GRM21BR60J226ME39
C2012X5R0J226K
JMK212BJ226KL
22μF
22μF
22μF
6.3V
6.3V
6.3V
X5R
X5R
X5R
0805
0805
0805
Table 5: Surface Mount Capacitors.
1. For reduced quiescent current R2 = 221k.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
21
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Ordering Information
Voltage
Package
Buck Converter
LDO
Marking1
Part Number (Tape and Reel)2
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
Adj - 0.6V
Adj - 0.6V
Adj - 0.6V
Adj - 0.6V
Adj - 0.6V
Adj - 0.6V
1.2V
1.8V
3.3V
3.0V
2.8V
2.7V
2.5V
1.5V
3.0V
2.7V
TDXYY
AAT2506IWP-AW-T1
QQXYY
AAT2506IWP-AQ-T1
SJXYY
AAT2506IWP-AN-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.
Legend
Voltage
Code
Adjustable (0.6V)
0.9
1.2
1.5
1.8
1.9
2.5
2.6
2.7
2.8
2.85
2.9
3.0
3.3
4.2
A
B
E
G
I
Y
N
O
P
Q
R
S
T
W
C
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
22
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
DATA SHEET
AAT2506
1MHz Step-Down Converter/LDO Regulator
Package Information
TDFN33-121
Index Area
0.40 ± 0.05
0.1 REF
C0.3
0.45 ± 0.05
2.40 ± 0.05
3.00 ± 0.05
Detail "A"
3.00 ± 0.05
1.70 ± 0.05
Top View
Bottom View
0.23 ± 0.05
Pin 1 Indicator
(optional)
0.05 ± 0.05
0.23 ± 0.05
0.75 ± 0.05
Detail "A"
Side View
1. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
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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
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202019B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
23