ams AS1323-BTTT-30 1.6î¼a quiescent current, single cell, dc-dc step-up converter Datasheet

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ams AG
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Datasheet
AS1323
1.6µA Quiescent Current, Single Cell, DC-DC
Step-up Converter
The AS1323 high-efficiency step-up DC-DC converter was designed
specifically for single-cell, battery-powered devices where lowest
quiescent current and high efficiency are essential.
The compact device is available in three fixed-voltage variations and
is perfect for a wide variety of applications where extremely-low
quiescent currents and very-small form factors are critical.
The devices are available as the standard products shown in Table
1. See also Ordering Information on page 13.
Table 1. Standard Products
Fixed Output Voltage
Package
AS1323-27
2.7V
TSOT23-5
3.0V
TSOT23-5
3.3V
TSOT23-5
1.6µA Quiescent Current
!
Input Voltage Range: 0.75 to 2V
!
Up to 100mA Output Current
!
Fixed Output Voltages: 2.7, 3.0 and 3.3V
!
Shutdown Current: 0.1µA
!
Output Voltage Accuracy: ±3%
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Model
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2 Key Features
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1 General Description
!
Efficiency: Up to 85%
!
No External Diode or FETs Needed
Integrated boot circuitry ensures start-up even with very-high load
currents.
!
Output Disconnect in Shutdown
The true output disconnect feature completely disconnects the
output from the battery during shutdown.
!
Guaranteed 0.95V Start-Up Voltage
!
TSOT23-5 Package
AS1323-30
AS1323-33
The device is available in a TSOT23-5 pin package.
3 Applications
The devices are ideal for single-cell portable devices including
mobile phones, MP3 players, PDAs, remote controls, personal
medical devices, wireless transmitters
and receivers, and any other battery-operated, portable device.
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Figure 1. AS1323 - Typical Operating Circuit
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10µH
1
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VBATT
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10µF
3
SHDNN
AS1323
5
VBATT
1
VSS
2
SHDNN
3
5
LX
4
VOUT
LX
2
VSS
AS1323
4
VOUT
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10µF
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AS1323
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
VSS 2
AS1323
4 VOUT
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SHDNN 3
5 LX
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VBATT 1
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Figure 2. Pin Assignments (Top View)
4.1 Pin Descriptions
Table 2. Pin Descriptions
Pin Name
VBATT
VSS
3
SHDNN
4
VOUT
5
LX
Description
Battery Supply Input and Coil Connection
Negative Supply and Ground
Shutdown Input.
0 = Shutdown mode.
1 = Normal operating mode.
Output. This pin also supplies bootstrap power to the device.
Inductor Connection. This pin is connected to the internal N-channel MOSFET switch drain and Pchannel synchronous rectifier drain.
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Pin Number
1
2
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AS1323
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 3 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 on page 4 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 3. Absolute Maximum Ratings
Max
Units
VBATT, SHDNN, LX to VSS
-0.3
+5
V
Maximum Current VOUT, LX
1
A
Thermal Resistance ΘJA
207.4
ºC/W
on PCB
Electro-Static Discharge
2
kV
HBM
Operating Temperature Range
-40
+85
ºC
Storage Temperature Range
-65
+150
ºC
+150
ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/
JEDEC J-STD-020 “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).
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Junction Temperature
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Min
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Parameter
+260
ºC
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Package Body Temperature
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AS1323
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
6.1 DC Electrical Characteristics
TAMB = -40°C to +85°C, VBATT = 1.2V, VOUT = VOUT(NOM), SHDNN = VOUT, RLOAD = ∞, unless otherwise noted. Typical values are at TA =
25°C.(unless otherwise specified). Limits are 100% production tested at TAMB = 25ºC. Limits over the operating temperature range are
guaranteed by design.
Symbol
Parameter
VINMIN
Minimum Input Voltage
VIN
Operating Input Voltage
TAMB = 25ºC
VINSU
Minimum Start-Up
Input Voltage
TAMB = 25ºC,
RLOAD = 100Ω
Min
Typ
0.75
0.95
AS1323-30
2.91
AS1323-33
3.201
2
V
0.95
V
3.0
3.09
3.3
3.399
30
40
mV
N-Channel On-Resistance
0.5
1.0
Ω
P-Channel On-Resistance
0.75
1.5
Ω
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2.619
V
2.781
Output Voltage
AS1323-27
Load depended drop
of VOUT
RLOAD
RDS-ON
N-Channel Switch
Current Limit
ILIMIT
tON
mA
Switch Maximum On-Time
6
µs
Synchronous Rectifier
Zero-Crossing Current
10
mA
6
µA
IQ-OUT
Quiescent Current to VOUT
IQ-BAT
Quiescent Current into VBATT
1
VBATT = 1.5V;
ILOAD = 45mA
Programmed at 400mA
V
400
Operating Current
into VBATT
IOP-OUT
Unit
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0.75
Max
2.7
VOUT
ISDI-OUT
Condition
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Table 4. Electrical Characteristics
VBATT = 1.5V, VOUT = 3.3V,
TAMB = 25ºC
VBATT = 1.5V, TAMB = 25ºC
1.6
3
µA
0.3
1
µA
200
nA
Shutdown Current to VOUT
Shutdown Current into VBATT
VIL
SHDNN Voltage Threshold, Low
VIH
SHDNN Voltage Threshold, High
ISDI
SHDNN Input Bias Current
VBATT = 1.5V, TAMB = 25ºC
100
150
TAMB = 25ºC, VSDI = VOUT
100
nA
mV
900
mV
300
nA
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ISDI-BAT
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1. VOUT is completely disconnected (0V) during shutdown.
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Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality
Control) methods.
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AS1323
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
VOUT= 3.3V; TA = 25°C; CIN = COUT = 10µF, L = 10µH, ILOAD = 10mA; VBATT = 1.5V; unless otherwise specified.
Figure 3. Efficiency vs. Output Current; VOUT = 3.3V
Figure 4. Efficiency vs. Output Current; VOUT = 3.0V
90
90
VIN = 1.8V
VIN = 1.2V
VIN = 0.95V
70
VIN = 1.5V
60
50
VIN = 1.2V
70
VIN = 0.95V
60
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VIN = 1.5V
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VIN = 1.8V
80
Efficiency (%) .
Efficiency (%) .
80
50
40
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40
30
30
0.1
1
10
0.1
100
1
Figure 5. Efficiency vs. Output Current; VOUT = 2.7V
90
10
100
Output Current (m A)
Output Current (mA)
Figure 6. Efficiency vs. Input Voltage
90
VIN = 1.8V
80
80
Efficiency (%) .
Efficiency (%) .
VIN = 1.5V
VIN = 1.2V
70
VIN = 0.95V
60
50
40
70
60
50
Il oad = 80µA
40
Il oad = 800µA
Il oad = 11mA
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30
0.1
1
10
30
0.75
100
1
Output Current (m A)
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Figure 7. Output Voltage vs. Temperature
2
VIN = 1.5V
3.35
No Load
3.305
3.3
1.75
3.4
3.31
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Output Voltage (V) .
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3.315
1.5
Figure 8. Output Voltage vs. Output Current
Output Voltage (V) .
3.32
1.25
Input Voltage (V)
ILOAD = 10mA
3.295
3.29
ILOAD = 30mA
VIN = 1.2V
3.3
3.25
3.2
3.15
3.1
3.05
3.285
3.28
3
-50
-25
0
25
50
75
100 125
0
Tem perature (°C)
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10
20
30
40
50
60
70
Output Current (m A)
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AS1323
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 9. Output Voltage vs. Input Voltage
Figure 10. Shutdown Current vs. Temperature
1000
3.4
3.34
3.32
3.3
3.28
3.26
3.24
VIN = 1.5V
100
VIN = 1.2V
10
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3.36
Input Current (nA) .
Output Voltage (V) .
3.38
1
3.2
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3.22
0.1
0.9
1
1.1
1.2 1.3
1.4 1.5
-50
1.6 1.7
-25
0
Figure 11. Minimum Input Startup Voltage vs. Temperature
1
25
50
75
100
125
Tem perature (°C)
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Input Voltage (V)
Figure 12. Output Voltage vs. Input Voltage;
VOUT = 2.7V
2.78
Output Voltage (V) .
Input Voltage (V) .
2.76
0.9
0.8
0.7
0.6
2.74
IOUT = 0mA
2.72
IOUT = 10mA
2.7
IOUT = 30mA
2.68
2.66
2.64
0.5
-50
-25
0
25
50
75
100
2.62
0.75
125
1
3.06
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Output Voltage (V) .
3.08
VOUT = 3.0V
3.04
3.02
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VOUT = 3.3V
3.38
IOUT = 0mA
IOUT = 10mA
IOUT = 30mA
2.96
2.94
2.92
2.9
0.75
1.75
3.4
3
2.98
1.5
Figure 14. Output Voltage vs. Input Voltage;
Output Voltage (V) .
3.1
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Figure 13. Output Voltage vs. Input Voltage;
1.25
Input Voltage (V)
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Tem perature (°C)
3.36
3.34
IOUT = 0mA
3.32
3.3
3.28
IOUT = 10mA
IOUT = 30mA
3.26
3.24
3.22
1
1.25
1.5
1.75
2
3.2
0.75
Input Voltage (V)
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1
1.25
1.5
1.75
2
Input Voltage (V)
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AS1323
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 15. Output Current vs. Input Voltage
Figure 16. SHDNN Threshold vs. Input Voltage
110
VOUT = 3.0V
80
70
VOUT = 3.3V
60
50
VOUT = 2.7V
40
30
0.8
0.7
0.6
0.5
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.
0.4
0.3
0.2
0.1
0
20
0.75
1
1.25
1.5
1.75
0.8
2
1
1.2
1.4
1.6
1.8
2
Input Voltage (V)
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Input Voltage (V)
200µs/Div
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200µs/Div
2V/Div
VLX
ILX
VOUT
2V/Div
20mA/DIV
VOUT
VLX
ILX
50mV/Div
Figure 18. Switching Waveform; VOUT = 3.0V
50mV/Div
Figure 17. Switching Waveform; VOUT = 2.7V
20mA/DIV
Output Current (mA)
90
0.9
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SHDNN Threshold Voltage (V) .
1
100
ILX
50mV/Div
20mA/DIV
2V/Div
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VOUT
Figure 19. Switching Waveform; VOUT = 3.3V
200µs/Div
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AS1323
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1323 is a compact, high-efficiency, step-up DC-DC converter guaranteed to start up with voltages as low as 0.95V, and operate with an
input voltage down to 0.75V. Consuming only 1.6µA of quiescent current, the device includes an integrated synchronous rectifier that eliminates
the need for an external diode and improves overall efficiency by minimizing losses (see Synchronous Rectification on page 8). The AS1323 also
features an active-low shutdown circuit that supply current to 0.1µA.
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Figure 20. Block Diagram
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L1
4
1
VOUT
VBATT
0.95 to
1.6V
CIN
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Comparator
Voltage
3
SHDNN
COUT
Comparator
Discharge
Control
Logic
Startup
System
Timing
AS1323
5
LX
Ref
Comparator
Charge
2
8.1 PFM Control
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VSS
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A forced discontinuous, current-limited, pulse-frequency modulation (PFM) control scheme provides ultra-low quiescent current and high
efficiency over a wide output current-range. Rather than using an integrated oscillator, the inductor current is limited by the 400mA N-channel
current limit or by the 6µs switch maximum on-time. After each device-on cycle, the inductor current must ramp to zero before another cycle can
start. When the error comparator senses that the output has fallen below the regulation threshold, another cycle can begin.
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8.2 Synchronous Rectification
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The integrated synchronous rectifier eliminates the need for an external Schottky diode, reducing cost and PCB space. During normal operation,
while the inductor discharges, the P-channel MOSFET turns on and shunts the MOSFET body diode. Consequently the rectifier voltage drop is
significantly reduced improving efficiency without the need for external components.
8.3 Low-Voltage Startup Circuit
The AS1323 contains a unique low-voltage startup circuit which ensures start-up even with very high load currents. The minimum start-up
voltage is independent of the load current. This device is powered from pin VBATT, guaranteeing startup at input voltages as low as 0.95V.
8.4 Shutdown
The AS1323 enter shutdown when the SHDNN pin is driven low. During shutdown, the output is completely disconnected from the battery.
Shutdown can be pulled as high as 3.6V, regardless of the voltage at pins VBATT or VOUT. For normal operation, connect SHDN to the input.
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AS1323
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
Figure 21. Typical Application
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10µH
5
LX
10µF
AS1323
3
2
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VBATT
VSS
4
SHDNN
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VOUT
10µF
9.1 Inductor Selection
The control scheme of the AS1323 allows for a wide range if inductor values. A 10µH inductor should be sufficient for most applications (see
Figure 21).
Smaller inductance values typically offer smaller physical size for a given series resistance, allowing the smallest overall circuit dimensions.
Applications using larger inductance values may startup at lower battery voltages, provide higher efficiency and exhibit less ripple, but they may
reduce the maximum output current. This occurs when the inductance is sufficiently large to prevent the maximum current limit (ILIMIT) from
being reached before the maximum on-time (tON) expires (see Electrical Characteristics on page 4).
V BATT ⋅ t ON
L > -------------------------------I LIMIT
(EQ 1)
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tONMAX is 6µs (typ)
ILIMIT is 400mA (typ)
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For maximum output current, the inductor value should be chosen such that the controller reaches the current-limit before the maximum on-time
is triggered:
For larger inductor values, the peak inductor current (IPEAK) can be determined by:
The inductor’s incremental saturation current rating should be greater than the peak switching current. However, it is generally advisable to bias
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V BATT ⋅ t ON
I PEAK = -------------------------------L
the inductor into saturation by as much as 20%, although this will slightly reduce efficiency.
(EQ 2)
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9.2 Maximum Output Current
The maximum output current (IOUTMAX) is a function of IPEAK, VIN, VOUT, and the overall efficiency (η) as indicated in the formula for
determining IOUTMAX:
1
V BATT
I OUTMAX = --- ⋅ I PEAK ⋅ ⎛⎝ -----------------⎞⎠ ⋅ η
V OUT
2
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AS1323
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9.3 Capacitor Selection
Choose input and output capacitors to supply the input and output peak currents with acceptable voltage ripple. The input filter capacitor
(CIN) reduces peak currents drawn from the battery and improves efficiency. Low equivalent series resistance (ESR) capacitors are
recommended.
Note: Ceramic capacitors have the lowest ESR, but low ESR tantalum or polymer capacitors offer a good balance between cost and performance.
VRIPPLE(ESR) = IPEAK RESR(COUT)
1
L
2
2
V RIPPLE ( C ) ≈ --- ⋅ ⎛⎝ --------------------------------------------------------------⎞⎠ ⋅ ( I PEAK – I OUT )
2 ( V OUT – V BATT ) ⋅ C OUT
Where: IPEAK is the peak inductor current.
(EQ 4)
(EQ 5)
(EQ 6)
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VRIPPLE = VRIPPLE(C) + VRIPPLE(ESR)
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Output voltage ripple has two components: variations in the charge stored in the output capacitor with each COIL pulse, and the voltage drop
across the capacitor’s ESR caused by the current into and out of the capacitor:
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For ceramic capacitors, the output voltage ripple is typically dominated by VRIPPLE(C). For example, a 10µF ceramic capacitor and a 10µH
inductor typically provide 75mV of output ripple when stepping up from 1.2V to 3.3V at 50mA. Low input-to-output voltage differences require
higher output capacitor values.
Capacitance and ESR variation of temperature should be considered for best performance in applications with wide operating temperature
ranges.
9.4 PC Board Layout Considerations
The AS1323 has been specially designed to be tolerant to PC board parasitic inductances and resistances. However, to achieve maximum
efficiency a careful PC board layout and component selection is vital.
Note: For the optimal performance, the IC’s VSS and the ground leads of the input and output capacitors must be kept less than 5mm apart
using a ground plane. In addition, keep all connections to COIL as short as possible.
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The system robustness guarantees a reliable operation even if those recommendations are not fully applied.
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AS1323
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
The device is available in an TSOT23-5 package.
c1
0.08
Typ
0.35
0.15
Max
1.00
0.10
0.90
0.45
0.39
0.20
0.13
0.16
0.05
0.87
ca
0.01
0.84
0.30
0.31
0.12
2.90BSC
2.80BSC
1.60BSC
0.95BSC
1.90BSC
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D
E
E1
e
e1
Min
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Symbol
A
A1
A2
b
b1
c
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Figure 22. TSOT23-5 Package
Notes
3,4
3,4
3,4
Symbol
L
L1
L2
N
R
R1
θ
θ1
aaa
bbb
ccc
ddd
Min
0.30
Typ
0.40
0.60REF
0.25BSC
5
0.10
0.10
0º
Max
0.50
Notes
0.25
4º
8º
4º
10º
12º
Tolerances of Form and Position
0.15
0.25
0.10
0.20
Notes:
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1. Dimensions are in millimeters.
2. Dimension D does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, and gate burrs shall not exceed
0.15mm per end. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.15mm
per side. Dimensions D and E1 are determined at datum H.
3. The package top can be smaller than the package bottom. Dimensions D and E1 are determined at the outermost extremes of the
plastic body exclusive of mold flash, tie bar burrs, gate burrs, and interlead flash, but include any mismatches between the top of the
package body and the bottom. D and E1 are determined at datum H.
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AS1323
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10.1 Tape and Reel Pin1 Orientation
Figure 23. Tape&Reel Pin1 Orientation
User direction of feed
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Top, Through View
TSOT23-5
TSOT23-5
TSOT23-5
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TSOT23-5
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AS1323
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The device is available as the standard products shown in Table 5.
Table 5. Ordering Information
Marking
Output
Description
Delivery Form
Package
AS1323-BTTT-27
ASJN
2.7V
1.6µA Quiescent Current, Single Cell, DC-DC
Step-up Converter
Tape and Reel
TSOT23-5
AS1323-BTTT-30
ASMP
3.0V
1.6µA Quiescent Current, Single Cell, DC-DC
Step-up Converter
Tape and Reel
AS1323-BTTT-33
ASMQ
3.3V
1.6µA Quiescent Current, Single Cell, DC-DC
Step-up Converter
Tape and Reel
TSOT23-5
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TSOT23-5
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Note: All products are RoHS compliant.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
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Ordering Code
Technical Support is found at http://www.austriamicrosystems.com/Technical-Support
For further information and requests, please contact us mailto:[email protected]
or find your local distributor at http://www.austriamicrosystems.com/distributor
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Design the AS1323 online at http://www.austriamicrosystems.com/analogbench
analogbench is a powerful design and simulation support tool that operates in on-line and off-line mode to evaluate performance and
generate application-specific bill-of-materials for austriamicrosystems' power management devices.
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AS1323
Datasheet
Copyrights
Copyright © 1997-2010, austriamicrosystems AG, Tobelbaderstrasse 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.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
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Disclaimer
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Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale.
austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding
the freedom of the described devices from patent infringement. austriamicrosystems 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 austriamicrosystems AG for
current information. This product is intended for use in normal 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 austriamicrosystems AG for each application. For shipments of less than 100
parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location.
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The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems 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
austriamicrosystems AG rendering of technical or other services.
Headquarters
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Contact Information
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austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
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Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
www.austriamicrosystems.com/DC-DC_Step-Up/AS1323
Revision 1.07
14 - 14
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