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AS1331
300mA Buck-Boost Synchronous DC/DC
Converter
General Description
This special device is a synchronous buck-boost DC/DC
converter which can handle input voltages above, below, or
equal to the output voltage.
Due to the internal structure of the AS1331 which is working
continuously through all operation modes this device is ideal
for dual or triple cell alkaline/NiCd/NiMH as well as single cell
Li-Ion battery applications.
Because of the implemented Power Save Mode, the solution
footprint and the component count is minimized and also over
a wide range of load currents a high conversion efficiency is
provided.
The device includes two N-channel MOSFET switches and two
P-channel switches. Also following features are implemented:
a quiescent current of typically 22μA (ideal for battery power
applications), a shutdown current less than 1μA, current
limiting, thermal shutdown and output disconnect.
The AS1331 is available in a 10-pin 3x3mm TDFN package with
fixed and adjustable output voltage.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS1331, 300mA Buck-Boost
Synchronous DC/DC Converter are listed below:
Figure 1:
Added Value of Using AS1331
Benefits
Features
• Ideal for single Li-Ion battery powered
applications
• Input voltage range: 1.8V to 5.5V
• Supports a variety of end applications
• Output voltage range: 2.5V to 3.3V
• Output current: 300mA @ 3.3V
• Automatic transition between buck and boost mode
• Built-in self-protection
• Short-circuit protection
• Overtemperature protection
• Output disconnection in shutdown
• Small system area
• 10-pin 3x3mm TDFN package
ams Datasheet
[v1-06] 2015-Dec-07
Page 1
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AS1331 − General Description
Applications
The AS1331 is an ideal solution for handheld computers,
handheld instruments, portable music players and PDA’s. Two
and three cell Alkaline, NiCd or NiMH or single cell Li battery
powered products.
Block Diagram
The functional blocks of this device are shown below:
Figure 2:
Typical Application Diagram
L1
6.8µH
4
1.8V to 5.5V
C1
10µF
SW2
2
5
LBO
7
AS1331-AD
LBI
On
Off
Low Battery Detect
8
VIN
R4
R5
R3
1
VOUT
6
10
EN
FB
R1
C2
22µF
VOUT
2.5V to 3.3V
R2
3
Page 2
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SW1
PGND
9
GND
ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Pin Assignment
Pin Assignment
Figure 3:
Pin Diagram (Top View)
VOUT 1
10 FB
9 GND
SW2 2
PGND 3
AS1331
8 LBO
SW1 4
VIN 5
7 LBI
11
6 EN
Figure 4:
Pin Description
Pin Name
Pin Number
VOUT
1
Output of the Buck/Boost Converter.
SW1
2
Buck/Boost Switch Pin. Connect the inductor from SW1 to SW2.
PGND
3
Power Ground. Both GND pins must be connected.
SW2
4
Buck/Boost Switch Pin. Connect the inductor from SW1 to SW2. An
optional Schottky diode can be connected between this pin and
VOUT to increase efficiency.
VIN
5
Input Supply Pin. A minimum 2.2μF capacitor should be placed
between VIN and GND.
EN
6
Enable Pin. Logic controlled shutdown input.
1 = Normal operation
0 = Shutdown; quiescent current <1μA
VIN must be present and stable before EN operation is valid during
start-up.
LBI
7
Low Battery Comparator Input. 1.25V Threshold. May not be left
floating. If connected to GND LBO is working as Output Power okay.
ams Datasheet
[v1-06] 2015-Dec-07
Description
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AS1331 − Pin Assignment
Pin Name
Pin Number
Description
LBO
8
Low Battery Comparator Output. This open-drain output is low
when the voltage on LBI is less than 1.25V.
GND
9
Ground. Both GND pins must be connected.
FB
10
Feedback Pin. Feedback input for the adjustable version. Connect a
resistor divider tap to this pin. The output voltage can be adjusted
from 2.5V to 3.3V by: VOUT = 1.25V[1 + (R1/R2)].(1)
NC
11
Exposed Pad. This pad is not connected internally. It can be used for
ground connection between GND and PGND.
Note(s):
1. For the fixed Output Voltage Version contact this pin to VOUT.
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Absolute Maximum Ratings
Absolute Maximum Ratings
Stresses beyond those listed in Absolute maximum Ratings may
cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any
other conditions beyond those indicated in Electrical
Characteristics is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
Figure 5:
Absolute Maximum Ratings
Parameter
Min
Max
Units
SW1, SW2, VIN, VOUT, EN
-0.3
+7
V
PGND to GND
-0.3
+0.3
V
SW1, SW2
-0.3
+7
V
Electrostatic Discharge ESD
±4
kV
Thermal Resistance θJA
+33
ºC/W
Junction Temperature
150
ºC
Operating Temperature Range
-40
85
ºC
Storage Temperature Range
-65
125
ºC
Package Body Temperature
Relative humidity (non-condensing)
Moisture sensitivity level
ams Datasheet
[v1-06] 2015-Dec-07
260
5
ºC
85
1
Notes
HBM MIL-Std. 883E 3015.7 methods
The reflow peak soldering
temperature (body temperature)
specified is in accordance with
IPC/JEDEC J-STD-020D
“Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid
State Surface Mount Devices”.
The lead finish for Pb-free leaded
packages is matte tin (100% Sn).
%
Unlimited floor life time
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AS1331 − Electrical Characteristics
Electrical Characteristics
All limits are guaranteed. The parameters with min and max
values are guaranteed with production tests or SQC (Statistical
Quality Control) methods.
V IN = 3.6V, V OUT = 3.3V, TAMB = -40°C to 85ºC. Typical values are
at TAMB = 25ºC. Unless otherwise specified.
Figure 6:
Electrical Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Units
5.5
V
1.6
1.8
V
1.6
1.7
V
3.30
V
Input
VIN
VUV
Input voltage range
1.8
Minimum startup voltage
ILOAD < 1mA
Undervoltage lockout
threshold(1)
VIN decreasing
1.5
Regulation
VOUT
Output voltage adjustable
version
2.50
Output voltage 3.3V
3.201
3.3
3.399
V
2.910
3.0
3.090
V
2.425
2.5
2.575
V
1.212
1.25
1.288
V
1
100
nA
2.15
2.3
V
Output voltage 3.0V
No Load
Output voltage 2.5V
VFB
FB voltage adjustable
version
No Load
IFB
FB input current adjustable
version
VFB = 1.3V, TAMB = 25°C
VOUT lockout threshold(2)
Rising Edge
2.0
Operating Current
Quiescent current VIN
VIN = 5V
2
6
μA
Quiescent current VOUT
VIN = 5V, VOUT = 3.6V,
VFB = 1.3V
20
32
μA
Shutdown current
EN = 0V, VOUT = 0V,
TAMB = 25ºC
0.01
1
μA
IQ
ISHDN
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Electrical Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Units
1
μA
Switches
IMOS
RON
IPEAK
MOS switch leakage
VIN = 5V, TAMB=25°C,
Switches A-D
0.01
NMOS B, C
VIN = 5V
0.13
Ω
PMOS A
VIN = 5V
0.17
Ω
PMOS D
VOUT = 3.3V
0.21
Ω
Peak current limit
L = 6.8μH, VIN = 5V
450
600
750
mA
Enable
VENH
EN input high
VENL
EN input low
IEN
EN input current
1.4
EN = 5.5V, TAMB = 25°C
V
0.4
V
1
100
nA
1.25
1.288
V
Low Battery and Power-OK
VLBI
LBI Threshold
Falling Edge
1.212
LBI Hysteresis
10
LBI Leakage current
LBI = 5.5V, TAMB = 25°C
LBO Voltage low(3)
ILBO = 1mA
LBO Leakage current
LBO = 5.5V, TAMB = 25°C
Power-OK threshold
LBI = 0V, falling edge
90
mV
1
100
nA
0.05
0.2
V
1
100
nA
92.5
95
%
Thermal Protection
Thermal shutdown
10°C hysteresis
145
°C
Note(s):
1. If the input voltage falls below this value during normal operation the device goes in startup mode.
2. The regulator is in startup mode until this voltage is reached. Caution: Do not apply full load current until the device output > 2.3V.
3. LBO goes low in startup mode as well as during normal operation if:
1) The voltage at the LBI pin is below LBI threshold.
2) The voltage at the LBI pin is below 0.1V and V OUT is below 92.5% of its nominal value.
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 − Typical Operating Characteristics
Typical Operating
Characteristics
Circuit of Figure 29, VIN = 2.4V, VOUT = 3.3V, TAMB = 25°C, unless
otherwise specified.
Figure 7:
Efficiency vs. Output Current; VOUT = 2.5V
100
Efficiency (%)
90
80
70
60
50
Vi n = 1.8V
40
Vi n = 3.6V
Vi n = 5.5V
30
0.1
1
10
100
1000
Output Current (mA)
Figure 8:
Efficiency vs. Output Current; VOUT = 3.0V
100
Efficiency (%)
90
80
70
60
50
Vi n = 1.8V
40
Vi n = 3.6V
Vi n = 5.5V
30
0.1
1
10
100
1000
Output Current (mA)
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Typical Operating Characteristics
Figure 9:
Efficiency vs. Output Current; VOUT = 3.3V
100
Efficiency (%)
90
80
70
60
50
Vi n = 1.8V
40
Vi n = 3.6V
Vi n = 5.5V
30
0.1
1
10
100
1000
Output Current (mA)
Figure 10:
Efficiency vs. Input Voltage
100
Efficiency (%)
90
80
70
60
50
Iout = 10mA
40
Iout = 100mA
Iout = 300mA
30
1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
Input Voltage (V)
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 − Typical Operating Characteristics
Figure 11:
IOUT Max vs. Input Voltage
Output Current max (mA)
500
400
300
200
100
0
1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
Input Voltage (V)
Figure 12:
Sleep Currents vs. Input Voltage
30
Sleep Current (µA)
25
IVOUT
20
15
10
5
IVIN
0
1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
Input Voltage (V)
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Typical Operating Characteristics
Figure 13:
IIN Short Circuit vs. Input Voltage
30
Input Current (mA)
25
20
15
10
5
0
1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
Input Voltage (V)
Figure 14:
VOUT Ripple vs. Input Voltage
Vout Ripple Voltage (mV)
250
200
150
100
50
10uF / Vpp
22uF / Vpp
47uF / Vpp
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 − Typical Operating Characteristics
Figure 15:
Load Regulation vs. Load Current
3.38
Output Voltage (V)
3.36
3.34
3.32
3.3
3.28
3.26
Vout - 10uF
Vout - 22uF
Vout - 47uF
3.24
0.1
1
10
100
1000
Load Current (mA)
Figure 16:
VOUT Regulation vs. Temperature
3.5
Output Voltage (V)
3.25
VOUT = 3.3V
3
VOUT = 3.0V
2.75
2.5
VOUT = 2.5V
2.25
2
-45 -30 -15
0
15
30
45
60
75
90
Temperature (°C)
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Typical Operating Characteristics
Figure 17:
IFB vs. Temperature; VIN = 5V
0.4
3.6V
5.0V
FB Input Current (µA)
0.3
5.5V
0.2
0.1
0
-0.1
-0.2
-45 -30 -15
0
15
30
45
60
75
90
Temperature (°C)
Figure 18:
EN Pin Threshold
Threshold Voltage (V)
1
0.9
0.8
0.7
up-ON
down-OFF
0.6
-45 -30 -15
0
15
30
45
60
75
90
Temperature (°C)
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 − Typical Operating Characteristics
ICOIL
200mA/Div
VOUT
200mV/Div
SW2
5V/Div
SW1
5V/Div
Figure 19:
VIN = 4.4V, VOUT = 3.3V, IOUT = 200mA
5µs/Div
ICOIL
200mA/Div
VOUT
200mV/Div
SW2
5V/Div
SW1
5V/Div
Figure 20:
VIN = 4.4V, VOUT = 3.3V, IOUT = 50mA
5µs/Div
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Typical Operating Characteristics
200mA/Div
ICOIL
200mV/Div
VOUT
5V/Div
SW2
SW1
5V/Div
Figure 21:
VIN = 3.6V, VOUT = 3.3V, IOUT = 200mA
5µs/Div
ICOIL
200mA/Div
200mV/Div
VOUT
5V/Div
SW2
SW1
5V/Div
Figure 22:
VIN = 3.6V, VOUT = 3.3V, IOUT = 50mA
5µs/Div
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 − Typical Operating Characteristics
200mA/Div
ICOIL
VOUT
200mV/Div
SW2
5V/Div
SW1
5V/Div
Figure 23:
VIN = 2.5V, VOUT = 3.3V, IOUT = 200mA
5µs/Div
ICOIL
200mA/Div
200mV/Div
VOUT
SW2
5V/Div
SW1
5V/Div
Figure 24:
VIN = 2.5V, VOUT = 3.3V, IOUT = 50mA
5µs/Div
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Typical Operating Characteristics
ICOIL
200mA/Div
200mV/Div
VOUT
5V/Div
SW2
SW1
5V/Div
Figure 25:
Shorted Output; VIN = 3.6V
1µs/Div
ICOIL
200mA/Div
VOUT
2V/Div
5V/Div
SW2
SW1
5V/Div
Figure 26:
Startup; VIN = 3.6V, Rload = 3.3kΩ
500µs/Div
ams Datasheet
[v1-06] 2015-Dec-07
Page 17
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AS1331 − Detailed Description
Detailed Description
The synchronous buck-boost converter AS1331 uses a Power
Save Mode control technique to reach a high efficiency over a
wide dynamic range of load currents. The output voltage is
monitored by a comparator with 3% accuracy. The Power Save
Mode puts the device into “sleep mode” when V OUT is above its
programmed reference threshold. Meaning, the switching is
stopped and only quiescent current is drawn from the power
source. The switching is started again when V OUT drops below
the reference threshold and the output capacitor is charged
again.
The numbers of current pulses which are necessary to load the
output capacitor are set by the value of the output capacitor,
the load current, and the comparator hysteresis (~1%).
Figure 27:
Block Diagram - Fixed Output Voltage
SW1
SW2
SW A
VIN
SW D
Gate Drivers and
Anticross
Conduction
SW B
IZERODetect
SW C
AS1331
Peak
Current
600mA Limit
VBEST
VOUT
FB
UVLO
Shutdown
R2
R1
Thermal Shutdown
PGND
Page 18
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1.25V
VOUTComp
1.6V
EN
VIN
VBEST
State
Machine
and
Logic
VIN
VOUT
GND
ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Detailed Description
Modes of Operation
When V OUT drops below the reference threshold, the AS1331
switches on the transistors SW A and SW C until the inductor
current reaches approximately 400mA. In the next step SW A
and SW D are closed and depending on the difference between
V IN and VOUT the inductor current raises, falls or stays constant.
• V IN > V OUT: The inductor current is going up to 600mA.
• V IN ~ V OUT: The device stops after 2μs.
• V IN < V OUT: The inductor current falls down to 0mA.
If the inductor current is not 0mA, the transistors SW B and SW
D are closed to ramp down the current to zero. If V OUT is still
below the threshold voltage the next cycle is started. If I MAX
(600mA) wasn’t reached in the previous cycle, SW A and SW D
are closed until the inductor current is 600mA.
Note(s): The 4-switch-mode
(SW A+SW C => SW B+SW D => SW A + SW C...) and also the
buck-mode (SW A+SW D => SW B+SW D => SW A+SW D...) are
never used.
Start-Up Mode
At start-up the switch SW D is disabled and its diode is used to
transfer current to the output capacitor until V OUT reaches
approximately 2.15V. The inductor current is controlled by an
alternate algorithm during start-up.
Note(s): Do not apply loads >1mA until V OUT = 2.3V is reached.
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 − Detailed Description
Other AS1331 Features
Shutdown
The part is in shutdown mode while the voltage at pin EN is
below 0.4V and is active when the voltage is higher than 1.4V.
EN operation during start-up is valid only after VIN is present
and stable. Do not connect EN directly to V IN as this does not
ensure reliable start-up of the regulator.
Note(s): EN can be driven above VIN or V OUT, as long as it is
limited to less than 5.5V.
In start-up enable pin must be pulled up after VIN is settled.
Recommended delay is 100μs between EN and VIN.
Figure 28:
AS1331 Start-Up Sequence
V
VIN
EN
t
Output Disconnect and Inrush Limiting
During shutdown V OUT is going to 0V so that no current from
the input source is running thru the device. The inrush current
is also limited at turn-on mode to minimize the surge currents
seen by the input supply. These features of the AS1331 are
realized by opening both P-channel MOSFETs of the rectifiers,
allowing a true output disconnect.
Page 20
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Detailed Description
Power-OK and Low-Battery-Detect Functionality
LBO goes low in startup mode as well as during normal
operation if:
• The voltage at the LBI pin is below LBI threshold (1.25V).
This can be used to monitor the battery voltage.
• LBI pin is connected to GND and VOUT is below 92.5% of
its nominal value. LBO works as a power-OK signal in this
case.
The LBI pin can be connected to a resistive-divider to monitor
a particular definable voltage and compare it with a 1.25V
internal reference. If LBI is connected to GND an internal
resistive-divider is activated and connected to the output.
Therefore, the Power-OK functionality can be realized with no
additional external components.
The Power-OK feature is not active during shutdown and
provides a power-on-reset function that can operate down to
V IN = 1.8V. A capacitor to GND may be added to generate a
power-on-reset delay. To obtain a logic-level output, connect a
pull-up resistor from pin LBO to pin V OUT. Larger values for this
resistor will help to minimize current consumption; a 100kΩ
resistor is perfect for most applications Figure 30.
For the circuit shown in the left of Figure 29, the input bias
current into LBI is very low, permitting large-value
resistor-divider networks while maintaining accuracy. Place the
resistor-divider network as close to the device as possible. Use
a defined resistor for R 5 and then calculate R 4 as:
(EQ1)
V IN
R 4 = R 5 ⋅  ------------ – 1
 V LBI

Where:
V LBI (the internal sense reference voltage) is 1.25V.
In case of the LBI pin is connected to GND, an internal
resistor-divider network is activated and compares the output
voltage with a 92.5% voltage threshold. For this particular
Power-OK application, no external resistive components are
necessary.
ams Datasheet
[v1-06] 2015-Dec-07
Page 21
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AS1331 − Detailed Description
Thermal Shutdown
To prevent the AS1331 from short-term misuse and overload
conditions the chip includes a thermal overload protection. To
block the normal operation mode all switches will be turned
off. The device is in thermal shutdown when the junction
temperature exceeds 145°C. To resume the normal operation
the temperature has to drop below 135°C.
A good thermal path has to be provided to dissipate the heat
generated within the package. Otherwise it’s not possible to
operate the AS1331 at its usable maximal power. To dissipate
as much heat as possible away from the package into a copper
plane with as much area as possible, it’s recommended to use
multiple vias in the printed circuit board. It’s also recommended
to solder the Exposed Pad (pin 11) to the GND plane.
Note(s): Continuing operation in thermal overload conditions
may damage the device and is considered bad practice.
Output Voltage Selection
The AS1331 is available in two versions Ordering & Contact
Information. One version can only operate at one fixed output
voltage Figure 30 and the other version can operate with
user-adjustable output voltages from 2.5V to 3.3V by
connecting a voltage divider between the pins V OUT and FB
Figure 29.
Figure 29:
Li-Ion to Adjustable Output Voltage
L1
6.8µH
4
Li-Ion Battery
SW1
SW2
2
5
C1
10µF
8
VIN
R4
LBO
7
AS1331-AD
LBI
R5
On
Off
VOUT
6
10
EN
FB
VOUT
2.5V to 3.3V
R1
C2
22µF
R2
3
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R3
1
PGND
9
GND
ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Detailed Description
The output voltage can be adjusted by selecting different
values for R1 and R2.
Calculate V OUT by:
R1
V OUT = V FB ×  1 + ------
R2
(EQ2)
Where:
VFB = 1.25V, V OUT = 2.5V to 3.3V;
R 2 (the predefined resistor in the resistor divider)
should be ≤ 270kΩ.
R 3 (the Pull-up resistor for the LBO pin) should be ~100kΩ.
Figure 30:
Li-Ion to 3.3V with POK - Fixed Output Voltage
L1
6.8µH
4
Li-Ion Battery
SW1
2
SW2
5
8
VIN
C1
10µF
LBO
AS1331-3.3V
7
LBI
On
Off
VOUT
6
10
EN
FB
3
ams Datasheet
[v1-06] 2015-Dec-07
PGND
9
R3
1
C2
22µF
VOUT
3.3V
300mA
GND
Page 23
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AS1331 − Application Information
Application Information
Component Selection
Only three power components are required to complete the
design of the buck-boost converter. For the adjustable version
V OUT programming resistors are needed. The high operating
frequency and low peak currents of the AS1331 allow the use
of low value, low profile inductors and tiny external ceramic
capacitors.
Inductor Selection
For best efficiency, choose an inductor with high frequency core
material, such as ferrite, to reduce core losses. The inductor
should have low DCR (DC resistance) to reduce the I²R losses,
and must be able to handle the peak inductor current without
saturating. A 6.8μH inductor with a >600mA current rating and
<400mΩ DCR is recommended.
Figure 31:
Recommended Inductors
Part Number
L
DCR
Current
Rating
Dimensions
(L/W/T)
LPS3015-682M
6.8μH
300mΩ
0.89A
3.0x3.0x1.5mm
EPL2014-682M
6.8μH
287mΩ
0.80A
2.0x2.0x1.4mm
XPL2010-682M
6.8μH
336mΩ
0.73A
2.0x1.9x1.0mm
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Manufacturer
Coilcraft
www.coilcraft.com
ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Application Information
Capacitor Selection
The buck-boost convertor requires two capacitors. Ceramic X5R
or X7R types will minimize ESL and ESR while maintaining
capacitance at rated voltage over temperature. The V IN
capacitor should be at least 2.2μF. The V OUT capacitor should
be between 10μF and 47μF. A larger output capacitor should
be used if lower peak to peak output voltage ripple is desired.
A larger output capacitor will also improve load regulation on
V OUT. See Figure 32 for a list of capacitors for input and output
capacitor selection.
Figure 32:
Recommended Input Capacitor
Part Number
C
TC
Code
Rated
Voltage
Dimensions
(L/W/T)
GRM188R61A225KE34
2.2μF
X5R
10V
0603, T=0.87mm
GRM188R60J475KE19
4.7μF
X5R
6.3V
0603, T=0.87mm
GRM219R60J106KE19
10μF
X5R
6.3V
0805, T=0.95mm
Manufacturer
Murata
www.murata.com
Figure 33:
Recommended Output Capacitor
Part Number
C
TC
Code
Rated
Voltage
Dimensions
(L/W/T)
GRM21BR61A106KE19
10μF
X5R
10V
0805, T=1.35mm
GRM319R61A106KE19
10μF
X5R
10V
1206, T=0.95mm
GRM319R61A106KE19
10μF
X5R
10V
1210, T=0.95mm
GRM31CR61C226KE15
22μF
X5R
16V
1206, T=1.8mm
GRM31CR60J475ME19
47μF
X5R
6.3V
1206, T=1.75mm
ams Datasheet
[v1-06] 2015-Dec-07
Manufacturer
Murata
www.murata.com
Page 25
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AS1331 − Package Drawings & Mark ings
Package Drawings & Markings
The device is available in a 10-pin 3x3mm TDFN package.
Figure 34:
10-Pin 3x3mm TDFN Package Diagram
RoHS
Green
Symbol
A
A1
A3
L
b
D
E
e
D2
E2
aaa
bbb
ccc
ddd
eee
N
Min
0.70
0
0.30
0.18
2.23
1.49
-
Typ
0.75
0.02
0.20 REF
0.40
0.25
3.00 BSC
3.00 BSC
0.50 BSC
2.38
1.64
0.15
0.10
0.10
0.05
0.08
10
Max
0.80
0.05
0.50
0.30
2.48
1.74
-
Note(s):
1. Dimensioning and tolerancing conform to ASME Y14.5M-1994.
2. All dimensions are in millimeters (angles are in degrees).
3. Coplanarity applies to the exposed heat slug as well as the terminal.
4. Radius on terminal is optional.
5. N is the total number of terminals.
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Package Drawings & Markings
Figure 35:
Package Marking
ASRx
YYWW
QZZ
Note(s):
1. Where x can be P, U, T, R.
Figure 36:
Package Code
YY
WW
Q
ZZ
Manufacturing year
Manufacturing week
Plant’s identifier
Letters of free choice
ams Datasheet
[v1-06] 2015-Dec-07
Page 27
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AS1331 − Ordering & Contact Information
Ordering & Contact Information
The device is available as the standard products shown in
Figure 37.
Figure 37:
Ordering Information
Ordering Code
Package
Marking
Output
Delivery
Form
Delivery Quantity
AS1331-BTDT-AD
10-pin 3x3mm
TDFN
ASRP
Adjustable
Tape & Reel
1000 pcs/reel
AS1331-BTDT-25(1)
10-pin 3x3mm
TDFN
ASRR
2.5V
Tape & Reel
1000 pcs/reel
AS1331-BTDT-30(1)
10-pin 3x3mm
TDFN
ASRT
3.0V
Tape & Reel
1000 pcs/reel
AS1331-BTDT-33
10-pin 3x3mm
TDFN
ASRU
3.3V
Tape & Reel
1000 pcs/reel
Note(s):
1. On request.
Buy our products or get free samples online at:
www.ams.com/ICdirect
Technical Support is available at:
www.ams.com/Technical-Support
Provide feedback about this document at:
www.ams.com/Document-Feedback
For further information and requests, e-mail us at:
[email protected]
For sales offices, distributors and representatives, please visit:
www.ams.com/contact
Headquarters
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten
Austria, Europe
Tel: +43 (0) 3136 500 0
Website: www.ams.com
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − RoHS Compliant & ams Green Statement
RoHS Compliant & ams Green
Statement
RoHS: The term RoHS compliant means that ams AG products
fully comply with current RoHS directives. Our semiconductor
products do not contain any chemicals for all 6 substance
categories, including the requirement that lead not exceed
0.1% by weight in homogeneous materials. Where designed to
be soldered at high temperatures, RoHS compliant products are
suitable for use in specified lead-free processes.
ams Green (RoHS compliant and no Sb/Br): ams Green
defines that in addition to RoHS compliance, our products are
free of Bromine (Br) and Antimony (Sb) based flame retardants
(Br or Sb do not exceed 0.1% by weight in homogeneous
material).
Important Information: The information provided in this
statement represents ams AG knowledge and belief as of the
date that it is provided. ams AG bases its knowledge and belief
on information provided by third parties, and makes no
representation or warranty as to the accuracy of such
information. Efforts are underway to better integrate
information from third parties. ams AG has taken and continues
to take reasonable steps to provide representative and accurate
information but may not have conducted destructive testing or
chemical analysis on incoming materials and chemicals. ams AG
and ams AG suppliers consider certain information to be
proprietary, and thus CAS numbers and other limited
information may not be available for release.
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 − Copyrights & Disclaimer
Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 30, 8141
Unterpremstaetten, Austria-Europe. Trademarks Registered. All
rights reserved. The material herein may not be reproduced,
adapted, merged, translated, stored, or used without the prior
written consent of the copyright owner.
Devices sold by ams AG are covered by the warranty and patent
indemnification provisions appearing in its General Terms of
Trade. ams AG makes no warranty, express, statutory, implied,
or by description regarding the information set forth herein.
ams AG reserves the right to change specifications and prices
at any time and without notice. Therefore, prior to designing
this product into a system, it is necessary to check with ams AG
for current information. This product is intended for use in
commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or
high reliability applications, such as military, medical
life-support or life-sustaining equipment are specifically not
recommended without additional processing by ams AG for
each application. This product is provided by ams AG “AS IS”
and any express or implied warranties, including, but not
limited to the implied warranties of merchantability and fitness
for a particular purpose are disclaimed.
ams AG shall not be liable to recipient or any third party for any
damages, including but not limited to personal injury, property
damage, loss of profits, loss of use, interruption of business or
indirect, special, incidental or consequential damages, of any
kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation
or liability to recipient or any third party shall arise or flow out
of ams AG rendering of technical or other services.
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Document Status
Document Status
Document Status
Product Preview
Preliminary Datasheet
Datasheet
Datasheet (discontinued)
ams Datasheet
[v1-06] 2015-Dec-07
Product Status
Definition
Pre-Development
Information in this datasheet is based on product ideas in
the planning phase of development. All specifications are
design goals without any warranty and are subject to
change without notice
Pre-Production
Information in this datasheet is based on products in the
design, validation or qualification phase of development.
The performance and parameters shown in this document
are preliminary without any warranty and are subject to
change without notice
Production
Information in this datasheet is based on products in
ramp-up to full production or full production which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade
Discontinued
Information in this datasheet is based on products which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade, but these products have been superseded and
should not be used for new designs
Page 31
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AS1331 − Revision Information
Revision Information
Changes from 1.4 (2010) to current revision 1-06 (2015-Dec-07)
Page
1.4 (2010) to 1-05 (2015-Dec-02)
Content was updated to the latest ams design
Added benefits to Key Features
1
Updated Other AS1331 Features section
20
Updated Package Drawings & Markings section
26
1-05 (2015-Dec-02) to 1-06 (2015-Dec-07)
Updated Figure 34
26
Note(s):
1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
2. Correction of typographical errors is not explicitly mentioned.
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 − Content Guide
Content Guide
ams Datasheet
[v1-06] 2015-Dec-07
1
1
2
2
General Description
Key Benefits & Features
Applications
Block Diagram
3
5
6
8
Pin Assignment
Absolute Maximum Ratings
Electrical Characteristics
Typical Operating Characteristics
18
19
19
20
21
22
22
Detailed Description
Modes of Operation
Start-Up Mode
Other AS1331 Features
Power-OK and Low-Battery-Detect Functionality
Thermal Shutdown
Output Voltage Selection
24
24
24
25
Application Information
Component Selection
Inductor Selection
Capacitor Selection
26
28
29
30
31
32
Package Drawings & Markings
Ordering & Contact Information
RoHS Compliant & ams Green Statement
Copyrights & Disclaimer
Document Status
Revision Information
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