AS1323
1.6μA Quiescent Current, Single Cell,
DC-DC Step-up Converter
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.
The compact device is available in three fixed-voltage variants
with Vout of 2.7V, 3.0V, and 3.3V. It is perfect for a wide variety
of applications where low quiescent currents and small form
factors are critical.
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.
Ordering Information
and
Content Guide
appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS1323, 1.6μA Quiescent Current,
Single Cell, DC-DC Step-up Converter are listed below:
Figure 1:
Added Value of Using AS1323
Benefits
Extended battery life
Features
• 1.6μA Quiescent Current
• Shutdown Current 0.1μA
• Efficiency Up to 85%
•
•
•
•
•
•
Input Voltage Range: 0.75 to 2V
Fixed Output Voltages: 2.7, 3.0 and 3.3V
Output Voltage Accuracy: ±3%
Up to 100mA Output Current
Output Disconnect in Shutdown
Guaranteed 0.95V Start-Up Voltage
Suitable to wide variety of applications
Enables cost effective PCB design
• No External Diode or FETs Needed
• TSOT23-5 Package
ams Datasheet
[v1-11] 2014-Dec-16
Page 1
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AS1323 −
General Description
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.
Figure 2:
Typical Operating Circuit
10µH
1
VBATT
10µF
5
LX
VBATT
1
5
LX
AS1323
3
SHDNN
2
VSS
4
VOUT
10µF
VSS
2
AS1323
SHDNN
3
4
VOUT
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ams Datasheet
[v1-11] 2014-Dec-16
AS1323 −
Pin Assignment
Pin Assignment
Figure 3:
Pin Diagram (Top View)
VBATT
1
5 LX
VSS
2
AS1323
SHDNN 3
4
VOUT
Pin Description
Figure 4:
Pin Description
Pin Number
1
2
3
4
5
Pin Name
VBATT
VSS
SHDNN
VOUT
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 P-channel synchronous rectifier drain.
ams Datasheet
[v1-11] 2014-Dec-16
Page 3
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AS1323 −
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
VBATT, SHDNN, LX to VSS
Maximum Current VOUT, LX
Thermal Resistance
Θ
JA
Electro-Static Discharge
Operating Temperature Range
Storage Temperature Range
Junction Temperature
Min
-0.3
Max
+5
1
207.4
±2
Units
V
A
ºC/W
kV
on PCB
HBM
Comments
-40
-65
85
150
150
ºC
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
Relative Humidity
non-condensing RH
NC
Moisture Sensitivity Level MSL
5
1
85
%
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ams Datasheet
[v1-11] 2014-Dec-16
AS1323 −
Electrical Characteristics
Electrical Characteristics
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.
Figure 6:
Electrical Characteristics
Symbol
VIN
MIN
VIN
VIN
SU
Parameter
Minimum Input Voltage
Operating Input Voltage
Minimum Start-Up
Input Voltage
Condition
Min
Typ
0.75
Max
Unit
V
TAMB = 25ºC
TAMB = 25ºC,
RLOAD = 100Ω
AS1323-27
0.95
0.75
2.619
2.91
3.201
2.7
3.0
3.3
30
0.5
0.75
2
0.95
2.781
3.09
3.399
40
1.0
1.5
V
V
VOUT
Output Voltage
AS1323-30
AS1323-33
V
RLOAD
Load depended drop
of VOUT
N-Channel ON-Resistance
VBATT = 1.5V;
I
LOAD
= 45mA
mV
Ω
Ω
mA
μs
mA
RDS-ON
P-Channel ON-Resistance
ILIMIT
N-Channel Switch
Current Limit
Switch Maximum ON-Time
tON
Synchronous Rectifier
Zero-Crossing Current
Operating Current
into VBATT
Quiescent Current to VOUT
Quiescent Current into VBATT
VBATT = 1.5V,
TAMB = 25ºC
VBATT = 1.5V,
VOUT = 3.3V,
TAMB = 25ºC
Programmed at
400mA
400
6
10
IOP-OUT
IQ-OUT
IQ-BAT
6
1.6
0.3
3
1
μA
μA
μA
ams Datasheet
[v1-11] 2014-Dec-16
Page 5
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