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Datasheet
AS1310
U l t r a L o w Q u i e s c e n t C u r r e n t , H y s te r e t i c D C - D C S t e p - U p C o n v e r t e r
1 General Description
The AS1310 is an ultra low I
Q
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. See
Ordering Information on page 18
for more information.
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.
2 Key Features
Input voltage range: 0.7V to 3.6V
Output current: 60mA @ V
IN
=0.9V, V
OUT
=1.8V
Quiescent current: 1µA (typ.)
Shutdown current: < 100nA
Up to 92% efficiency
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.
Figure 1. AS1310 Typical Application Diagram
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V
IN
0.7V to 3.6V
C
1
22µF
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Output disconnect in shutdown
Feedthrough mode when V
IN
> V
OUT
Adjustable low battery detection
No external diode or transistor required
Over temperature protection
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.
L1
6.8µH
3
LX
8
VIN
1
LBI
7
EN
2
GND
6
LBO
R
3
Low Battery Detect
R
1
R
2
AS1310
4
VOUT
5
REF
C
REF
100nF
C
2
22µF
V
OUT
1.8V to 3.3V
On
Off
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Fixed output voltage range: 1.8V to 3.3V
AS1310
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
LBI
GND
LX
1
8
VIN
EN
LBO
REF
2
7
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
2
3
4
5
6
7
Pin Name
LBI
GND
LX
VOUT
REF
LBO
EN
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3
6
AS1310
VOUT
4
Exposed pad
5
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 VOUT with a ceramic capacitor as close as possible to VOUT 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 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.
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AS1310
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 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
VIN, VOUT, EN, LBI, LBO to GND
LX, REF to GND
Input Current (latch-up immunity)
Electrostatic Discharge
Electrostatic Discharge HBM
Thermal Resistance
θ
JA
Junction Temperature
-0.3
-0.3
-100
±2
58
+5
V
OUT
+ 0.3
100
V
V
mA
kV
Min
Max
Units
Comments
Norm: JEDEC 78
Temperature Ranges and Storage Conditions
Storage Temperature Range
Package Body Temperature
Humidity non-condensing
Moisture Sensitive Level
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Norm: MIL 883 E method 3015
ºC/W
ºC
ºC
+125
+125
-55
+260
ºC
5
85
%
1
Represents a maximum floor life time of unlimited
Revision 1.8
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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AS1310
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
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.
Table 3. Electrical Characteristics
Symbol
T
AMB
Input
V
IN
Regulation
V
OUT
Input Voltage Range
Minimum Startup Voltage
Output Voltage Range
I
LOAD
= 1mA, T
AMB
= +25°C
0.7
0.7
Parameter
Operating Temperature Range
Conditions
Min
-40
Typ
Output Voltage Tolerance
V
OUT
Lockout Threshold
Operating Current
Quiescent Current V
IN
I
Q
Quiescent Current V
OUT
I
SHDN
Switches
R
ON
Shutdown Current
NMOS
PMOS
NMOS maximum On-time
I
PEAK
Enable, Reference
V
ENH
V
ENL
I
EN
I
REF
Peak Current Limit
Zero Crossing Current
EN Input Voltage High
EN Input Voltage Low
EN Input Bias Current
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REF Input Bias Current
LBI Threshold
Low Battery & Power-OK
V
LBI
I
LBI
Te
LBI Hysteresis
LBI Leakage Current
LBO Voltage Low
2
V
LBO
I
LBO
LBO Leakage Current
Power-OK Threshold
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1.8
-2
-3
3.3
+2
+3
V
I
LOAD
= 10 mA, T
AMB
= +25°C
I
LOAD
= 10mA
Rising Edge
%
%
V
1
1.55
1.65
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
0.8
1
V
OUT
= 3V
0.35
0.5
4.2
20
3.6
5
320
400
0.7
EN = 3.6V, T
AMB
= +25°C
REF = 0.99xV
OUTNOM
, T
AMB
= +25°C
Falling Edge
LBI = 3.6V, T
AMB
= +25°C
I
LBO
= 1mA
LBO = 3.6V, T
AMB
= +25°C
LBI = 0V, Falling Edge
90
92.5
20
0.57
0.6
25
Revision 1.8
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Max
+85
3.6
Units
°C
V
0.8
V
1.75
100
1.2
nA
µA
nA
Ω
Ω
100
4.8
35
µs
480
mA
mA
V
0.1
100
100
0.63
100
100
100
95
V
nA
nA
V
mV
nA
mV
nA
%
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