AS1310
Ultra Low Quiescent Current,
Hysteretic DC-DC Step-Up Converter
General Description
The AS1310 is an ultra low quiescent current hysteretic step-up
DC-DC converter optimized for light loads (60mA), where it
achieves efficiencies of up to 92%.
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.
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.
In light load operation, the device enters a sleep mode when
most of the internal operating blocks are turned OFF in order
to save power. This mode is active approximately 50μs after a
current pulse provided that the output is in regulation.
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
battery voltage decreases below the threshold defined by two
external resistors on pin LBI, the LBO output is pulled to logic
low.
The AS1310 is available in a TDFN (2x2) 8-pin package.
Ordering Information
and
Content Guide
appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS1310, Ultra Low Quiescent
Current, Hysteretic DC-DC Step-Up Converter are listed below:
Figure 1:
Added Value of Using AS1310
Benefits
Ideal for single Li-Ion battery powered
applications
Features
• Wide Input Voltage Range (0.7V to 3,6V)
• Feed through mode when V
IN
> V
OUT
• High Efficiency up to 92%
• Low Quiescent Current of typ. 1uA
• Low Shutdown Current of less than 100nA
• Fixed output voltage range (1.8V to 3.3V)
• Output Disconnect in shutdown
• Output current: 60mA @ VIN=0.9V, VOUT=1.8V
Extended battery life
Supports a variety of end applications
ams Datasheet
[v1-11] 2015-Jan-28
Page 1
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AS1310 −
General Description
Benefits
Over – temperature protection and
shutdown
Early power-fail warning
Cost effective, small package
Features
Integrated temperature monitoring
Adjustable low battery detection
• No external diode or transistor required
• 8-pin TDFN (2mm x 2mm)
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 2:
Typical Application Diagram
L1
6.8μH
V
IN
0.7V to 3.6V
C
1
22μF
R
1
3
8
VIN
1
R
2
On
Off
LBI
7
EN
2
LX
6
LBO
R
3
V
OUT
1.8V to 3.3V
C
2
22μF
C
REF
100nF
Low Battery Detect
AS1310
4
VOUT
5
REF
GND
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ams Datasheet
[v1-11] 2015-Jan-28
AS1310 −
Pin Assignment
Pin Assignment
Figure 3:
Pin Diagram (Top View)
LBI
GND
LX
VOUT
1
8
VIN
EN
LBO
REF
2
7
AS1310
3
6
4
Exposed pad
5
Figure 4:
Pin Description
Pin Number
1
2
3
4
5
6
7
Pin Name
LBI
GND
LX
V
OUT
REF
LBO
EN
Description
Low Battery Comparator Input.
0.6V Threshold. May not be left floating. If
connected to GND, LBO is working as Power Output OK.
Ground
External Inductor Connector
Output Voltage.
Decouple V
OUT
with a ceramic capacitor as close as
possible to V
OUT
and
GND.
Reference Pin.
Connect a 100nF ceramic capacitor to this pin.
Low Battery Comparator Output.
Open-drain output.
Enable Pin.
Logic controlled shutdown input.
1 = Normal operation;
0 = Shutdown; shutdown current <100nA.
Battery Voltage Input.
Decouple V
IN
with a 22μF ceramic capacitor as
close as possible to V
IN
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
V
IN
9
NC
ams Datasheet
[v1-11] 2015-Jan-28
Page 3
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AS1310 −
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
Comments
Electrical Parameters
V
IN
, V
OUT
, EN, LBI, LBO to GND
LX, REF to GND
Input Current (latch-up
immunity)
-0.3
-0.3
-100
+5
V
OUT
+ 0.3
100
V
V
mA
Norm: JEDEC 78
Electrostatic Discharge
Electrostatic Discharge HBM
±2
kV
Norm: MIL 883 E method 3015
Temperature Ranges and Storage Conditions
Thermal Resistance
θ
JA
Junction Temperature
Storage Temperature Range
-55
58
+125
+125
ºC/W
ºC
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).
Package Body Temperature
+260
ºC
Humidity non-condensing
Moisture Sensitive Level
5
1
85
%
Represents a maximum floor life
time of unlimited
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ams Datasheet
[v1-11] 2015-Jan-28
AS1310 −
Electrical Characteristics
Electrical Characteristics
All limits are guaranteed. The parameters with Min and Max
values are guaranteed by production tests or SQC (Statistical
Quality Control) methods.
V
IN
=
1.5V, C1 = C2 = 22μF, C
REF
= 100nF, Typical values are at
T
AMB
= +25ºC (unless otherwise specified). All limits are
guaranteed. The parameters with min and max values are
guaranteed with production tests or SQC (Statistical Quality
Control) methods.
Figure 6:
Electrical Characteristics
Symbol
T
AMB
Parameter
Operating Temperature
Range
Conditions
Min
-40
Typ
Max
+85
Units
°C
Input
V
IN
Input Voltage Range
Minimum Startup Voltage
I
LOAD
= 1mA, T
AMB
= +25°C
Regulation
V
OUT
Output Voltage Range
I
LOAD
= 10 mA, T
AMB
= +25°C
Output Voltage Tolerance
I
LOAD
= 10mA
V
OUT
Lockout Threshold
(1)
Rising Edge
Operating Current
V
OUT
= 1.02xV
OUTNOM
,
REF = 0.99xV
OUTNOM
,
T
AMB
= +25°C
V
OUT
= 1.02xV
ON
, REF =
0.99xV
ON
,
No load, T
AMB
= +25°C
T
AMB
= +25ºC
-3
1.55
1.65
+3
1.75
%
V
1.8
-2
3.3
+2
V
%
0.7
0.7
3.6
0.8
V
V
Quiescent Current V
IN
I
Q
Quiescent Current V
OUT
100
nA
0.8
1
1.2
μA
I
SHDN
Shutdown Current
100
nA
ams Datasheet
[v1-11] 2015-Jan-28
Page 5
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