D a ta s h e e t
AS1323
1 . 6 µ A Q u i e s c e n t C u r r e n t , S i n g l e C e l l , D C - D C St e p - u p C o n v e r t e r
1 General Description
The AS1323 high-efficiency step-up DC-DC converter
was designed specifically for single-cell, battery-pow-
ered devices where lowest quiescent current and high
efficiency are essential.
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
Model
AS1323-27
AS1323-30
AS1323-33
Fixed Output Voltage
2.7V
3.0V
3.3V
Package
TSOT23-5
TSOT23-5
TSOT23-5
2 Key Features
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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
Output Voltage Accuracy: ±3%
Efficiency: Up to 85%
No External Diode or FETs Needed
Output Disconnect in Shutdown
Guaranteed 0.95V Start-Up Voltage
TSOT23-5 Package
Integrated boot circuitry ensures start-up even with very-
high load currents.
The true output disconnect feature completely discon-
nects the output from the battery during shutdown.
The device is available in a TSOT23-5 pin package.
3 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 1. Typical Operating Circuit
10µH
1
VBATT
10µF
5
LX
VBATT
1
5
LX
AS1323
3
SHDNN
2
VSS
VSS
2
AS1323
4
VOUT
10µF
SHDNN
3
4
VOUT
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AS1323
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
VBATT 1
5 LX
VSS 2
AS1323
SHDNN 3
4 VOUT
Pin Descriptions
Table 2. Pin Descriptions
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.
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AS1323
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 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 Character-
istics 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
VBATT, SHDNN, LX to VSS
Maximum Current VOUT, LX
Thermal Resistance
Θ
JA
Electro-Static Discharge
Operating Temperature Range
Storage Temperature Range
Junction Temperature
-40
-65
Min
-0.3
Max
+5
1
207.4
2
+85
+150
+150
Units
V
A
ºC/W
kV
ºC
ºC
ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020D “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).
on PCB
HBM
Comments
Package Body Temperature
+260
ºC
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AS1323
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
DC Electrical Characteristics
T
AMB
= -40°C to +85°C, V
BATT
= 1.2V, V
OUT
= V
OUT(NOM)
, SHDNN = V
OUT
, R
LOAD
=
∞,
unless otherwise noted. Typical
values are at TA = 25°C.(unless otherwise specified). Limits are 100% production tested at T
AMB
= 25ºC. Limits over
the operating temperature range are guaranteed by design.
Table 4. Electrical Characteristics
Symbol
V
INMIN
V
IN
V
INSU
Parameter
Minimum Input Voltage
Operating Input Voltage
Minimum Start-Up
Input Voltage
T
AMB
= 25ºC
T
AMB
= 25ºC,
R
LOAD
= 100Ω
AS1323-27
V
OUT
Output Voltage
AS1323-30
AS1323-33
R
LOAD
R
DS-ON
I
LIMIT
t
ON
Load depended drop
of V
OUT
N-Channel On-Resistance
P-Channel On-Resistance
N-Channel Switch
Current Limit
Switch Maximum On-Time
Synchronous Rectifier
Zero-Crossing Current
I
OP-OUT
I
Q-OUT
I
Q-BAT
I
SDI-OUT
I
SDI-BAT
V
IL
V
IH
I
SDI
1
Condition
Min
Typ
0.75
Max
Unit
V
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
V
V
BATT
= 1.5V;
I
LOAD
= 45mA
mV
Ω
Ω
mA
µs
mA
µA
Programmed at 400mA
400
6
10
Operating Current
into V
BATT
Quiescent Current to V
OUT
Quiescent Current into
V
BATT
Shutdown Current to V
OUT
Shutdown Current into
V
BATT
SHDNN Voltage Threshold,
Low
SHDNN Voltage Threshold,
High
V
BATT
= 1.5V, V
OUT
=
3.3V, T
AMB
= 25ºC
6
1.6
3
1
200
µA
µA
nA
nA
mV
V
BATT
= 1.5V, T
AMB
= 25ºC
0.3
V
BATT
= 1.5V, T
AMB
= 25ºC
150
100
900
100
300
mV
nA
SHDNN Input Bias Current T
AMB
= 25ºC, V
SDI
= V
OUT
1. V
OUT
is completely disconnected (0V) during shutdown.
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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AS1323
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
V
OUT
= 3.3V; T
A
= 25°C; C
IN
= C
OUT
= 10µF, L = 10µH, I
LOAD
= 10mA; V
BATT
= 1.5V; unless otherwise specified.
Figure 3. Efficiency vs. Output Current; V
OUT
= 3.3V
90
V
IN
= 1.8V
Figure 4. Efficiency vs. Output Current; V
OUT
= 3.0V
90
V
IN
= 1.8V
80
V
IN
= 1.2V
80
V
IN
= 1.5V
Efficiency (%)
.
Efficiency (%)
.
V
IN
= 1.5V
70
60
50
40
30
0.1
1
V
IN
= 0.95V
70
60
50
40
30
V
IN
= 1.2V
V
IN
= 0.95V
10
100
0.1
1
10
100
Output Current (mA)
Figure 5. Efficiency vs. Output Current; V
OUT
= 2.7V
90
V
IN
= 1.8V
Output Current (m A)
Figure 6. Efficiency vs. Input Voltage
90
80
80
V
IN
= 1.5V
Efficiency (%)
.
70
60
50
40
30
0.1
V
IN
= 1.2V
V
IN
= 0.95V
Efficiency (%)
.
70
60
50
40
30
0.75
Il oad = 80µA
Il oad = 800µA
Il oad = 11mA
1
10
100
1
1.25
1.5
1.75
2
Output Current (m A)
Figure 7. Output Voltage vs. Temperature
3.32
3.315
No Load
Input Voltage (V)
Figure 8. Output Voltage vs. Output Current
3.4
3.35
V
IN
= 1.5V
V
IN
= 1.2V
Output Voltage (V)
.
3.31
3.305
3.3
3.295
3.29
I
LOAD
= 30mA
I
LOAD
= 10mA
Output Voltage (V)
.
75
100 125
3.3
3.25
3.2
3.15
3.1
3.05
3
3.285
3.28
-50
-25
0
25
50
0
10
20
30
40
50
60
70
Tem perature (°C)
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Output Current (m A)
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