AS1323_04 [AMSCO]
1.6μA Quiescent Current, Single Cell, DC-DC Step-up Converter; 1.6μA静态电流，单细胞， DC-DC升压转换器
| 型号： | AS1323_04 |
| 厂家： | 
AMS(艾迈斯) |
| 描述： | 1.6μA Quiescent Current, Single Cell, DC-DC Step-up Converter |
| 文件： | 总15页 (文件大小：1170K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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is now
ams AG
The technical content of this austriamicrosystems datasheet is still valid.
Contact information:
Headquarters:
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
e-Mail: ams_sales@ams.com
Please visit our website at www.ams.com
Datasheet
AS1323
1.6µA Quiescent Current, Single Cell, DC-DC
Step-up Converter
1 General Description
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.
2 Key Features
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
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
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
Output Voltage Accuracy: ±3%
Efficiency: Up to 85%
Model
Fixed Output Voltage
Package
TSOT23-5
TSOT23-5
TSOT23-5
AS1323-27
AS1323-30
AS1323-33
2.7V
3.0V
3.3V
No Extrnal Diode or FETs Need
Output DisconnecShutdown
Guaranteed 095V tart-Up Voltage
TSOTPackage
Integrated boot circuitry ensures start-up even with very-high load
currents.
The true output disconnect feature completely disconnects the
output from the battery during shutdown.
The device is available in a TSOT23-5 pin package.
3 Applications
Te 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.
Figure 1. AS1323 - Typical Operating Circuit
10µ
VBATT
VSS
1
2
3
5
LX
1
5
VAT
LX
10µF
2
AS1323
AS1323
VSS
3
4
SHDNN
4
VOUT
SHDNN
VOUT
10µF
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AS1323
Datasheet - Pin Assignments
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
VBATT
VSS
1
2
3
5
4
LX
AS1323
SHDNN
VOUT
4.1 Pin Descriptions
Table 2. Pin Descriptions
Pin Number
Pin Name
VBATT
VSS
Description
Battery Suply Input and Coil Connectn
Negave upply and Ground
Shutdonput.
1
2
0 = Shutdown mode.
3
SHDNN
1 = Normal operating mode.
Output. This pin also supliebootstrap power to the device.
Inductor Connction. This pin is connected to the internal N-channel MOSFET switch drain and P-
channel synchronos rectifier drain.
4
5
VOUT
LX
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AS1323
Datasheet - Absolute Maximum Ratings
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
Parameter
Min
Max
+5
Units
V
Comments
VBATT, SHDNN, LX to VSS
Maximum Current VOUT, LX
Thermal Resistance ΘJA
Electro-Static Discharge
Operating Temperature Range
Storage Temperature Range
Junction Temperature
-0.3
1
A
207.4
2
ºC/W
kV
on PCB
HBM
-40
-65
+85
+150
+150
ºC
ºC
ºC
The reflow peak solderintemprature (body
temperature) specifiein aordance with IPC/
JEDEC J-STD-020 “Moture/Reflow Sensitivity
Classification for Non-Hermetic Solid State Surface
ount evices”.
Package Body Temperature
+260
ºC
The lead finish for Pb-free leaded packages is matte tin
(100% Sn).
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AS1323
Datasheet - Electrical Characteristics
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.
Table 4. Electrical Characteristics
Symbol
VINMIN
VIN
Parameter
Condition
Min
Typ
Max
Unit
V
Minimum Input Voltage
Operating Input Voltage
0.75
TAMB = 25ºC
0.95
2
V
Minimum Start-Up
Input Voltage
TAMB = 25ºC,
RLOAD = 100Ω
VINSU
0.75
0.95
V
AS1323-27
AS1323-30
AS1323-33
2.619
2.91
2.7
3.0
3
2.781
3.09
VOUT
Output Voltage
V
3.201
3.399
Load depended drop
VATT = 15V;
ILAD = 45A
RLOAD
30
40
mV
of VOUT
N-Channel On-Resistance
P-Channel On-Resistance
0.5
1.0
1.5
Ω
Ω
RDS-ON
0.75
N-Channel Switch
Current Limit
ILIMIT
tON
Programmed at 400mA
400
6
mA
µs
Switch Maximum On-Time
Synchronous Rectifier
Zero-Crossing Current
10
mA
VBAT= 1.5VOUT = 3.3V,
MB = 25ºC
Operating Curnt
IOP-OUT
6
µA
into VBATT
IQ-OUT
IQ-BAT
Quiescent Current to VOUT
Quiescent Current into VBATT
1.6
0.3
3
1
µA
µA
VBATT = 1.5V, TAMB = 25ºC
VBATT = 1.5V, TAMB = 25ºC
1
Shutdown Current to VUT
200
nA
ISDI-OUT
ISDI-BAT
VIL
Shutdown Current into VBATT
SHDNN Voltage Threshow
SHDNN VoltagThreshold, High
SHDNN Iut Bias Current
100
100
nA
mV
mV
nA
150
VIH
900
300
ISDI
TAMB = 25ºC, VSDI = VOUT
1. VOUT is completely disconncted (0V) during shutdown.
Note: All limits are guranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality
Contromethods.
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AS1323
Datasheet - Typical Operating Characteristics
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
V
= 1.8V
IN
V
= 1.8V
IN
80
70
60
50
40
30
80
70
60
50
40
3
V
= 1.2V
IN
V
= 1.5V
= 1.2V
IN
V
IN
= 1.5V
V
V
IN
= 0.95V
IN
V
= 0.95V
IN
0.1
1
10
100
0.1
1
10
100
Output Curren(mA)
Output Current (mA)
Figure 5. Efficiency vs. Output Current; VOUT = 2.7V
re 6. Efficiency vs. Input Voltage
90
90
V
IN
= 1.8V
80
70
60
50
40
30
80
70
6
50
40
30
V
= 1.5V
= 1.2V
= 0.95V
IN
V
V
IN
IN
Iload =80µA
Iload =800µA
Iload =11mA
0.1
1
10
100
0.75
1
1.25
1.5
1.75
2
Output Curret (mA)
Input Voltage (V)
Figure 7. Output Voltage vs. Temperate
Figure 8. Output Voltage vs. Output Current
3.32
3.4
V
IN
= 1.5V
3.35
3.3
3.315
No Load
3.31
V = 1.2V
IN
3.25
3.2
3.305
3
.295
3.29
I
I
= 10mA
= 30mA
LOAD
LOAD
3.15
3.1
3.05
3
3.285
3.28
-50 -25
0
25 50
75 100 125
0
10
20
30
40
50
60
70
Temperature (°C)
Output Current (mA)
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AS1323
Datasheet - Typical Operating Characteristics
Figure 9. Output Voltage vs. Input Voltage
Figure 10. Shutdown Current vs. Temperature
3.4
3.38
3.36
3.34
3.32
3.3
1000
V
IN
= 1.5V
100
10
1
V
IN
= 1.2V
3.28
3.26
3.24
3.22
3.2
0.1
0.9
1
1.1 1.2 1.3 1.4 1.5 1.6 1.7
Input Voltage (V)
-50 -25
0
25
50
75 100 125
Temperature (°C)
Figure 11. Minimum Input Startup Voltage vs. Temperature
Figure 12. Outpt Voltage vs. Input Voltage;
VOUT = 2.7V
1
2.78
2.76
2.74
0.9
0.8
0.7
0.6
0.5
I
= 0mA
= 10mA
= 30mA
OUT
2.72
2
I
I
OUT
OUT
2.6
266
2.64
2.62
-50 -25
0
25
50
75 00 125
0.75
1
1.25
1.5
1.75
2
Temperature (°C)
Input Voltage (V)
Figure 13. Output Voltage vs. Input Voltae;
VOUT = 3.0V
Figure 14. Output Voltage vs. Input Voltage;
VOUT = 3.3V
3.1
3.4
3.08
3.06
3.38
3.36
I
= 0mA
OUT
3.04
3.02
3
3.34
3.32
3.3
I
= 0mA
OUT
I
= 10mA
OUT
I
= 10mA
OUT
I
= 30mA
OUT
2.98
.96
2.94
2.92
2.9
3.28
3.26
3.24
3.22
3.2
I
= 30mA
OUT
0.75
1
1.25
1.5
1.75
2
0.75
1
1.25
1.5
1.75
2
Input Voltage (V)
Input Voltage (V)
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AS1323
Datasheet - Typical Operating Characteristics
Figure 15. Output Current vs. Input Voltage
Figure 16. SHDNN Threshold vs. Input Voltage
110
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
100
90
V
= 3.0V
OUT
80
70
60
50
40
30
20
V
= 3.3V
OUT
V
= 2.7V
OUT
0.8
1
1.2
1.4
1.6
1.
2
0.75
1
1.25
1.5
1.75
2
Input Voltage (V)
Input Voltage (V)
Figure 17. Switching Waveform; VOUT = 2.7V
Figure 18. Switing Waveform; VOUT = 3.0V
200µs/Div
200µs/Div
Figure 19. Switching Waveform; VOUT = .3V
200µs/Div
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AS1323
Datasheet - Detailed Description
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.
Figure 20. Block Diagram
L1
4
1
OUT
VBATT
CIN
0.95 to
1.6V
COUT
Comparator
Discharge
Comparator
Voltage
Control
Logic
Startup
Syste
Tim
5
3
LX
SHDNN
AS1323
Ref
Comrator
Charge
2
VSS
8.1 PFM Control
A forced discontinuous, current-limited, puse-frequency modulation (PFM) control scheme provides ultra-low quiescent current and high
efficiency over a wide output current-rang. Rater than using an integrated oscillator, the inductor current is limited by the 400mA N-channel
current limit or by the 6µs switch maxium on-time. After each device-on cycle, the inductor current must ramp to zero before another cycle can
start. When the error comparator snses that the output has fallen below the regulation threshold, another cycle can begin.
8.2 Synchronous Rectification
The integrated synchronus rectifier eliminates the need for an external Schottky diode, reducing cost and PCB space. During normal operation,
while the inductodischarges, the P-channel MOSFET turns on and shunts the MOSFET body diode. Consequently the rectifier voltage drop is
significantly redud improving efficiency without the need for external components.
8Low-Voltage Startup Circuit
The A1323 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 - Application Information
9 Application Information
Figure 21. Typical Application
10µH
1
5
VBATT
LX
10µF
2
AS1323
VSS
3
4
SHDNN
VOUT
10µF
9.1 Inductor Selection
The control scheme of the AS1323 allows for a wide range iinductor values. A H inuctr should be sufficient for most applications (see
Figure 21).
Smaller inductance values typically offer smallephycal size for a given seies reistance, allowing the smallest overall circuit dimensions.
Applications using larger inductance values martup at lower battery voltaes, provide higher efficiency and exhibit less ripple, but they may
reduce the maximum output current. This occwhen the inductanficiently large to prevent the maximum current limit (ILIMIT) from
being reached before the maximum on-time (tON) expires (see Electharacteristics on page 4).
For maximum output current, the inductor value should be chsen sch that the controller reaches the current-limit before the maximum on-time
is triggered:
VBATT ⋅ tON
(EQ 1)
-------------------------------
L >
ILIMIT
tONMAX is 6µs (typ)
ILIMIT is 400mA (typ)
For larger inductor values, the peak nductor current (IPEAK) can be determined by:
The inductor’s incremental saturion current rating should be greater than the peak switching current. However, it is generally advisable to bias
VBATT ⋅ tON
(EQ 2)
-------------------------------
IPEAK =
L
the inductor into aturaon by as much as 20%, although this will slightly reduce efficiency.
9.Mamum Output Current
The aximum output current (IOUTMAX) is a function of IPEAK, VIN, VOUT, and the overall efficiency (η) as indicated in the formula for
determining IOUTMAX:
1
--
VBATT
VOUT
⎛
⎝
⎞
⎠
(EQ 3)
----------------
IOUTMAX =
⋅ IPEAK ⋅
⋅ η
2
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AS1323
Datasheet - Application Information
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 perfor-
mance.
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:
VRIPPLE = VRIPPLE(C) + VRIPPLE(ESR)
VRIPPLE(ESR) = IPEAK RESR(COUT)
(EQ 4)
(Q
1
--
L
2
2
⎛
⎝
⎞
⎠
--------------------------------------------------------------
(EQ 6)
VRIPPLE(C) ≈
⋅
⋅ (IPEAK – IOUT )
2
(VOUT – VBATT) ⋅ COUT
Where: IPEAK is the peak inductor current.
For ceramic capacitors, the output voltage ripple is typically dominated by VRIPPLE(C). For example, a 10µF ceramic cpacitand a 10µH
inductor typically provide 75mV of output ripple when stepping up from 1.2V to 3.3V at 50mA. Low input-to-output voltge difrences require
higher output capacitor values.
Capacitance and ESR variation of temperature should be considered for best erformane 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 parastic inductances anresitances. 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 te ground leads of the input d ouput capacitors must be kept less than 5mm apart
using a ground plane. In addition, keep all cnections to COIL as shors possible.
The system robustness guarantees a reliable operatn even if those recommendtions are not fully applied.
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AS1323
Datasheet - Package Drawings and Markings
10 Package Drawings and Markings
The device is available in an TSOT23-5 package.
Figure 22. TSOT23-5 Package
Symbol
Min
Typ
Max
0
0
0.90
0.45
0.39
0.20
Notes
Sybol
Min
Typ
0.40
Max
Notes
A
A1
A2
b
L
L1
L2
N
0.30
0.50
0.01
0.84
0.30
0.31
0.12
0.05
0.87
0.60REF
0.25BSC
5
b1
c
0.35
0.15
R
0.10
0.10
R1
0.25
8º
c1
0.08
0.13
16
0º
4º
4º
θ
θ1
D
E
2.90BSC
2.80BSC
1.60BS
.95BC
1.0BSC
3,4
3,4
3,4
10º
12º
Tolerances of Form and Position
E1
e
aaa
bbb
ccc
ddd
0.15
0.25
0.10
0.20
e1
Notes:
1. Dimenons are in millimeters.
2. ension D does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, and gate burrs shall not exceed
.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 - Package Drawings and Markings
10.1 Tape and Reel Pin1 Orientation
Figure 23. Tape&Reel Pin1 Orientation
User direction of feed
Top, Through View
TSOT23-5
TSOT23-5
TSOT23-5
TSOT23-5
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AS1323
Datasheet - Ordering Information
11 Ordering Information
The device is available as the standard products shown in Table 5.
Table 5. Ordering Information
Ordering Code
Marking
Output
Description
Delivery Form
Package
1.6µA Quiescent Current, Single Cell, DC-DC
Step-up Converter
AS1323-BTTT-27
ASJN
2.7V
Tape and Reel
TSOT23-5
1.6µA Quiescent Current, Single Cell, DC-DC
Step-up Converter
AS1323-BTTT-30
AS1323-BTTT-33
ASMP
ASMQ
3.0V
3.3V
Tape and Reel
Tape and Reel
TSOT23-5
TSOT23-5
1.6µA Quiescent Current, Single Cell, DC-DC
Step-up Converter
Note: All products are RoHS compliant.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
Technical Support is found at http://www.austriamicrosystems.com/Technical-Support
For further information and requests, please contact us mailto:sales@austriamcrosystems.com
or find your local distributor at http://www.austriamicrosystem.com/distributor
Design the AS1323 online at http://www.austriamicrosystems.c/analogbench
analogbench is a powerful design and simulation support tool tat operates in on-lie ad off-line mode to evaluate performance and
generate application-specific bill-of-materials for austriamicrosystems' power managment 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.
Disclaimer
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 pries
any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG fo
current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature rae,
unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment ar
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.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamirosysms AG shall not
be liable to recipient or any third party for any damages, including but not limiteto personal injury, property dam, loss f profits, loss of use,
interruption of business or indirect, special, incidental or consequential damags, of any nd, in connection with or ariing out of the furnishing,
performance or use of the technical data herein. No obligation or liability to recipnt or any third party shall rie oflow out of
austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters
austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaten, Astria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 313525 1
FSales Oices, Distributors and Representatives, please visit:
http://ww.austriamicrosystems.com/contact
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