AS1310 [AMSCO]
Ultra Low Quiescent Current, Hysteretic DC-DC Step-Up Converter; 超低静态电流，滞回DC-DC升压转换器
| 型号： | AS1310 |
| 厂家： | 
AMS(艾迈斯) |
| 描述： | Ultra Low Quiescent Current, Hysteretic DC-DC Step-Up Converter |
| 文件： | 总15页 (文件大小：372K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Datasheet
AS1310
Ultra Low Quiescent Current, Hysteretic DC-DC Step-Up Converter
1 General Description
The AS1310 is an ultra low IQ hysteretic step-up DC-DC converter
optimized for light loads (60mA), where it achieves efficiencies of up
to 92%.
2 Key Features
ꢀ
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Input Voltage Range: 0.7V to 3.6V
Fixed Output Voltage Range: 1.8V to 3.3V
Output Current: 60mA @ VIN=0.9V, VOUT=1.8V
Quiescent Current: 1µA (typ.)
AS1310 operates from a 0.7V to 3.6V supply and supports output
voltages between 1.8V and 3.3V. Besides the available AS1310
standard variants any variant with output voltages in 50mV steps are
available. See Ordering Information on page 14 for more information.
Shutdown Current: < 100nA
Up to 92% efficiency
If the input voltage exceeds the output voltage the device is in a
feed-through mode and the input is directly connected to the output
voltage.
Output Disconnect in Shutdown
Feedthrough Mode when VIN > VOUT
Adjustable Low Battery detection
No external diode or transistor required
Over Temperature Protection
In order to save power the AS1310 features a shutdown mode,
where it draws less than 100nA. During shutdown mode the battery
is disconnected from the output.
The AS1310 also offers adjustable low battery detection. If the bat-
tery voltage decreases below the threshold defined by two external
resistors on pin LBI, the LBO output is pulled to logic low.
TDFN (2x2) 8-pin package
The AS1310 is available in a TDFN (2x2) 8-pin package.
3 Applications
The AS1310 is an ideal solution for single and dual cell powered
devices as blood glucose meters, remote controls, hearing aids,
wireless mouse or any light-load application.
Figure 1. AS1310 - Typical Application Diagram
L1
6.8µH
LX
3
VIN
Low Battery Detect
6
0.7V to 3.6V
8
VIN
LBO
R3
4
C1
22µF
R1
R2
VOUT
1
AS1310
1.8V to 3.3V
VOUT
LBI
C2
22µF
5
7
On
Off
REF
EN
CREF
100nF
GND
2
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AS1310
Datasheet - Pin Assignments
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
LBI
GND
LX
1
2
3
4
8
7
6
5
VIN
EN
AS1310
LBO
REF
VOUT
9
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
Pin Name
Description
Low Battery Comparator Input. 0.6V Threshold. May not be left floating. If connected to GND, LBO is
working as Power Output OK.
1
LBI
2
3
Ground
External Inductor Connector.
GND
LX
Output Voltage. Decouple VOUT with a 22µF ceramic capacitor as close as possible to VOUT and
GND.
4
VOUT
5
6
Reference Pin. Connect a 100nF ceramic capacitor to this pin.
Low Battery Comparator Output. Open-drain output.
REF
LBO
Enable Pin. Logic controlled shutdown input.
1 = Normal operation;
7
EN
0 = Shutdown; shutdown current <100nA.
Battery Voltage Input. Decouple VIN with a 22µF ceramic capacitor as close as possible to VIN and
GND.
Exposed Pad. This pad is not connected internally. Can be left floating or connect to GND to achieve
an optimal thermal performance.
8
VIN
NC
9
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AS1310
Datasheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 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 2. Absolute Maximum Ratings
Parameter
Electrical Parameters
Min
Max
Units
Comments
VIN, VOUT, EN, LBI, LBO to GND
LX, REF to GND
-0.3
-0.3
-100
+5
VOUT + 0.3
100
V
V
Input Current (latch-up immunity)
mA
Norm: JEDEC 78
Electrostatic Discharge
Electrostatic Discharge HBM
Temperature Ranges and Storage Conditions
Thermal Resistance θJA
+/- 2
kV
Norm: MIL 883 E method 3015
+33
ºC/W
ºC
Junction Temperature
+150
+125
Storage Temperature Range
-55
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”.
Package Body Temperature
+260
85
ºC
%
The lead finish for Pb-free leaded packages is matte
tin (100% Sn).
Humidity non-condensing
Moisture Sensitive Level
5
1
Represents a max. floor life time of unlimited
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AS1310
Datasheet - Electrical Characteristics
6 Electrical Characteristics
VIN = 1.5V, C1 = C2 = 22µF, CREF = 100nF, TAMB = -40°C to +85ºC. Typical values are at TAMB = +25ºC. Unless otherwise specified.
Table 3. Electrical Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Operating Temperature Range
TAMB
-40
85
°C
Input
Input Voltage Range
VIN
0.7
3.6
0.8
V
V
Minimum Startup Voltage
ILOAD = 1mA, TAMB = +25°C
0.7
Regulation
Output Voltage Range
VOUT
1.8
-2
3.3
+2
+3
V
ILOAD = 10 mA, TAMB = +25°C
ILOAD = 10mA
%
%
Output Voltage Tolerance
-3
VOUT Lockout Threshold1
Rising Edge
1.55
1.65
1.75
V
Operating Current
VOUT = 1.02xVOUTNOM, REF =
0.99xVOUTNOM, TAMB = +25°C
Quiescent Current VIN
100
nA
IQ
VOUT = 1.02xVON, REF = 0.99xVON, no
load, TAMB = +25°C
Quiescent Current VOUT
0.8
1
1.2
µA
nA
Shutdown Current
TAMB = +25ºC
ISHDN
100
Switches
NMOS
VOUT = 3V
VOUT = 3V
0.35
0.5
4.2
400
20
Ω
Ω
RON
PMOS
NMOS maximum On-time
Peak Current Limit
Zero Crossing Current
3.6
320
5
4.8
480
35
µs
mA
mA
IPEAK
Enable, Reference
EN Input Voltage High
VENH
VENL
IEN
0.7
V
V
EN Input Voltage Low
EN Input BiasCurrent
REF Input BiasCurrent
0.1
100
100
EN = 3.6V, TAMB = +25°C
nA
nA
IREF
REF = 0.99xVOUTNOM, TAMB = +25°C
Low Battery & Power-OK
VLBI
LBI Threshold
Falling Edge
0.57
0.6
25
0.63
V
LBI Hysteresis
mV
nA
ILBI
VLBO
ILBO
LBI Leakage Current
LBI = 3.6V, TAMB = +25°C
ILBO = 1mA
100
100
LBO Voltage Low2
20
mV
LBO Leakage Current
Power-OK Threshold
LBO = 3.6V, TAMB = +25°C
100
95
nA
%
LBI = 0V, Falling Edge
90
92.5
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AS1310
Datasheet - Electrical Characteristics
Table 3. Electrical Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Thermal Protection
Thermal Shutdown
10°C Hysteresis
150
°C
1. The regulator is in startup mode until this voltage is reached. Caution: Do not apply full load current until the device output > 1.75V
2. 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 VOUT is below 92.5% of its nominal value.
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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AS1310
Datasheet - Typical Operating Characteristics
7 Typical Operating Characteristics
TAMB = +25°C, unless otherwise specified.
Figure 3. Efficiency vs. Output Current; VOUT = 1.8V
Figure 4. Efficiency vs. Output Current; VOUT = 1.8V
90
90
L1: XPL2010-682M
L1: XPL7030-682M
85
85
80
75
70
65
60
55
80
75
70
65
60
55
50
45
40
Vin =0.9V
Vin =0.9V
Vin =1.2V
Vin = 1.5V
50
Vin =1.2V
45
Vin = 1.5V
40
0.01
0.1
1
10
100
1000
0.01
0.1
1
10
100
1000
1000
3
Output Current (mA)
Output Current (mA)
Figure 5. Efficiency vs. Output Current; VOUT = 3.0V
Figure 6. Efficiency vs. Output Current; VOUT = 3.0V
100
100
L1: XPL2010-682M
L1: XPL7030-682M
95
95
90
85
80
75
70
65
60
55
50
45
40
90
85
80
75
70
65
60
Vin =0.9V
Vin =0.9V
Vin =1.2V
Vin =1.2V
Vin = 1.5V
Vin =1.8V
Vin =2.4V
55
50
45
40
Vin = 1.5V
Vin =1.8V
Vin =2.4V
0.01
0.1
1
10
100
1000
0.01
0.1
1
10
100
Output Current (mA)
Output Current (mA)
Figure 7. Efficiency vs. Input Voltage; VOUT = 1.8V
Figure 8. Maximum Output Current vs. Input Voltage
100
180
L1: XPL2010-682M
95
160
140
120
100
80
90
85
80
75
70
65
60
55
50
60
40
Iout = 1mA
Iout=10mA
Iout=50mA
Vout =1.8V
20
0
Vout =3.0V
0.7
0.9
1.1
1.3
1.5
1.7
1.9
0
0.5
1
1.5
2
2.5
Input Voltage (V)
Input Voltage (V)
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AS1310
Datasheet - Typical Operating Characteristics
Figure 9. Start-up Voltage vs. Output Current
Figure 10. RON vs. Temperature
1
1
0.95
0.9
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.85
0.8
0.75
0.7
0.65
0.6
PM OS
NM OS
0.55
0.5
0
1
2
3
4
5
6
7
8
9
10
-40
-15
10
35
60
85
Output Current (mA)
Temperature (°C)
Figure 11. Output Voltage Ripple; VIN = 2V, VOUT = 3V,
Rload = 100Ω
5µs/Div
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AS1310
Datasheet - Detailed Description
8 Detailed Description
The AS1310 is available with fixed output voltages from 1.8V to 3.3V in 50mV steps.
Figure 12. AS1310 - Block Diagram
0.7 to 3.6V
6.8µH
Zero
1.8V to 3.3V
Output
Input
Crossing
LX
VOUT
Detector
COUT
22µF
CIN
22µF
Startup
Circuitry
Driver
and
R3
VIN
LBI
Control
Logic
–
+
LBO
REF
Imax
Detection
VREF
AS1310
EN
CREF
100nF
GND
AS1310 Features
Shutdown
The part is in shutdown mode while the voltage at pin EN is below 0.1V and is active when the voltage is higher than 0.7V.
Note: EN can be driven above VIN or VOUT, as long as it is limited to less than 3.6V.
Output Disconnect and Inrush Limiting
During shutdown VOUT is going to 0V and no current from the input source is running through the device. This is true as long as the input voltage
is higher than the output voltage.
Feedthrough Mode
If the input voltage is higher than the output voltage the supply voltage is connected to the load through the device. To guarantee a proper func-
tion of the AS1310 it is not allowed that the supply exceeds the maximum allowed input voltage (3.6V).
In this feedtrough mode the quiescent current is 35µA (typ.). The device goes back into step-up mode when the oputput voltage is 4% (typ.)
below VOUTNOM.
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AS1310
Datasheet - 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 (0.6V). 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 0.6V 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 realised
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 VIN = 0.7V. 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 R3 from pin LBO to pin VOUT.
Larger values for this resistor will help to minimize current consumption; a 100kΩ resistor is perfect for most applications (see Figure 14 on page
10).
For the circuit shown in the left of Figure 13, 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 R2 and then calculate R1
as:
VIN
⎛
⎝
⎞
– 1
(EQ 1)
-----------
R1 = R2 ⋅
⎠
VLBI
Where:
VLBI is 0.6V.
Figure 13. Typical Application with adjustable Battery Monitoring
L1
6.8µH
LX
3
VIN
Low Battery Detect
R3
0.7V to 3.6V
8
6
VIN
LBO
C1
22µF
R1
R2
VOUT
1.8V to 3.3V
4
1
AS1310
VOUT
LBI
C2
22µF
5
7
On
Off
REF
EN
CREF
100nF
GND
2
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Revision 1.04
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AS1310
Datasheet - Detailed Description
Figure 14. Typical Application with LBO working as Power-OK
L1
6.8µH
LX
3
VIN
Low Battery Detect
R3
0.7V to 3.6V
8
6
VIN
LBO
C1
22µF
VOUT
1.8V to 3.3V
4
1
AS1310
VOUT
LBI
C2
22µF
5
7
On
Off
REF
EN
CREF
100nF
GND
2
Thermal Shutdown
To prevent the AS1310 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 150°C. To resume the
normal operation the temperature has to drop below 140°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 AS1310 at
its useable maximal power. To dissipate as much heat as possible from the package into a copper plane with as much area as possible, it’s rec-
ommended to use multiple vias in the printed circuit board. It’s also recommended to solder the Exposed Pad (pin 9) to the GND plane.
Note: Continuing operation in thermal overload conditions may damage the device and is considered bad practice.
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AS1310
Datasheet - Application Information
9 Application Information
Component Selection
Only four components are required to complete the design of the step-up converter. The low peak currents of the AS1310 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
>500mA current rating and <500mΩ DCR is recommended.
Table 4. Recommended Inductors
Part Number
XPL2010-682M
EPL2014-682M
LPS3015-682M
LPS3314-682M
LPS4018-682M
XPL7030-682M
LQH32CN6R8M53L
LQH3NPN6R8NJ0L
LQH44PN6R8MJ0L
L
DCR
Current Rating
0.62A
0.59A
0.86A
0.9A
Dimensions (L/W/T)
2.0x1.9x1.0mm
2.0x2.0x1.4mm
3.0x3.0x1.5mm
3.3x3.3x1.3mm
3.9x3.9x1.7mm
7.0x7.0x3.0mm
3.2x2.5x1.55mm
3.0x3.0x1.1mm
4.0x4.0x1.1mm
Manufacturer
Coilcraft
www.coilcraft.com
6.8µH
6.8µH
6.8µH
6.8µH
6.8µH
6.8µH
6.8µH
6.8µH
6.8µH
421mΩ
287mΩ
300mΩ
240mΩ
150mΩ
59mΩ
1.3A
9.4A
Murata
www.murata.com
250mΩ
210mΩ
143mΩ
0.54A
0.7A
0.72A
Capacitor Selection
The convertor requires three capacitors. Ceramic X5R or X7R types will minimize ESL and ESR while maintaining capacitance at rated voltage
over temperature. The VIN capacitor should be 22µF. The VOUT capacitor should be between 22µF 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 VOUT. See Table 5
for a list of capacitors for input and output capacitor selection.
Table 5. Recommended Input and Output Capacitors
Part Number
C
TC Code
X5R
Rated Voltage
6.3V
Dimensions (L/W/T)
0805, T=1.25mm
1206, T=1.6mm
Manufacturer
Murata
www.murata.com
GRM21BR60J226ME99
GRM31CR61C226KE15
GRM31CR60J475KA01
22µF
22µF
47µF
X5R
16V
X5R
6.3V
1206, T=1.6mm
On the pin REF a 10nF capacitor with an Insulation resistance >1GΩ is recommended.
Table 6. Recommended Capacitors for REF
Insulation
Rated
Part Number
C
TC Code
Dimensions (L/W/T)
Manufacturer
Murata
Resistance
Voltage
GRM188R71C104KA01
GRM31CR61C226KE15
100nF
100nF
X7R
X7R
16V
0603, T=0.8mm
0805, T=1.25mm
>5GΩ
>5GΩ
www.murata.com
50V
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Revision 1.04
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AS1310
Datasheet - Package Drawings and Markings
10 Package Drawings and Markings
Figure 15. TDFN (2x2) 8-pin Marking
Package Code:
XXX - encoded Datecode
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AS1310
Datasheet - Package Drawings and Markings
Figure 16. TDFN (2x2) 8-pin package Diagram
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AS1310
Datasheet - Ordering Information
11 Ordering Information
The device is available as the standard products shown in Table 7.
Table 7. Ordering Information
Ordering Code
Marking
Output
Description
Delivery Form
Package
Ultra Low Quiescent Current, Hysteretic DC-DC
Step-Up Converter
AS1310-BTDT-18
A2
1.8V
Tape and Reel
TDFN (2x2) 8-pin
Ultra Low Quiescent Current, Hysteretic DC-DC
Step-Up Converter
AS1310-BTDT-20
AS1310-BTDT-25
AS1310-BTDT-27
AS1310-BTDT-30
A8
A9
A7
A6
tbd
tbd
2.0V
2.5V
2.7V
3.0V
3.3V
tbd
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
TDFN (2x2) 8-pin
TDFN (2x2) 8-pin
TDFN (2x2) 8-pin
TDFN (2x2) 8-pin
TDFN (2x2) 8-pin
TDFN (2x2) 8-pin
Ultra Low Quiescent Current, Hysteretic DC-DC
Step-Up Converter
Ultra Low Quiescent Current, Hysteretic DC-DC
Step-Up Converter
Ultra Low Quiescent Current, Hysteretic DC-DC
Step-Up Converter
Ultra Low Quiescent Current, Hysteretic DC-DC
Step-Up Converter
AS1310-BTDT-331
Ultra Low Quiescent Current, Hysteretic DC-DC
Step-Up Converter
AS1310-BTDT-xx2
1. On request
2. Non-standard devices are available between 1.8V and 3.3V in 50mV steps.
Note: All products are RoHS compliant and austriamicrosystems green.
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@austriamicrosystems.com
or find your local distributor at http://www.austriamicrosystems.com/distributor
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AS1310
Datasheet
Copyrights
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All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of
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freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at
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current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range,
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