AS1343
4 2 V, 1 - 2 C e l l s , M i c r o p o w e r, D C - D C B o o s t C o n v e r t e r
D a ta S he e t
1 General Description
The AS1343 boost converter contains a 1.4A internal
switch in a tiny TDFN-10 3x3mm package. The device
operates from a 0.9V to 3.6V supply, and can boost volt-
ages up to 42V output.
The output voltage can easily be adjusted by an external
resistor divider.
The AS1343 uses a unique control scheme providing
the highest efficiency over a wide range of load condi-
tions. An internal 1.4A MOSFET reduces external com-
ponent count, and a fixed high switching frequency
(1MHz) allows for tiny surface-mount components.
The AS1343 also features power-OK circuitry which
monitors the output voltage.
Additionally the AS1343 features a low quiescent supply
current and a shutdown mode to save power. During
shutdown an output disconnect switch separates the
input from the output.
The AS1343 is ideal for LCD or OLED panels with low
current requirements and can also be used in a wide
range of other applications.
The device is available in a low-profile TDFN-10 3x3mm
package.
2 Key Features
5.5V to 42V Adjustable Output Voltage
0.9V to 3.6V Supply Voltage Range
High Output Currents:
- 30mA @ 12V V
OUT
, from 1.5V V
CC
- 40mA @ 24V V
OUT
, from 2.5V V
CC
Efficiency: Up to 85%
Switching Frequency: 1MHz
Output Disconnect Function
Power-OK Output
Quiescent Current: 22µA
Shutdown Current: 0.1µA
TDFN-10 3x3mm Package
3 Applications
The device is ideal for OLED display power supply, LCD
bias generators, mobile/cordless phones, palmtop com-
puters, PDAs and organizers, handy terminals, driving
LEDs or any other portable, battery-powered device.
Figure 1. Typical Application Diagram
L
1
V
CC
= 0.9V
to 3.6V
C
IN
VCC
R
3
POK
On
Off
LX
SWOUT
VOUT
D
1
V
OUT
= 5.5V to 42V
C
OUT
AS1343
R
1
EN
FB
R
2
GND
PGND
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AS1343
Data Sheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
EN 1
POK 2
GND 3
VCC 4
PGND 5
10 FB
9 VOUT
AS1343
8 GND
7 SWOUT
6 LX
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
Pin Name
EN
Description
Active-Low enable Input.
A logic low on this pin shuts down the device and
reduces the supply current to 0.1µA.
GND: device in shutdown.
V
CC
: normal operation.
Power-OK.
0: V
OUT
< 90% of V
OUTNOM
.
1: V
OUT
> 90% of V
OUTNOM
.
Ground
+0.9V to +3.6V Supply Voltage.
Bypass this pin to GND with a
≥10µF
capacitor.
Ground.
Should be the starpoint of C
IN
and C
OUT
.
Inductor.
The drain of the internal N-channel MOSFET.
Note:
This pin is high impedance in shutdown.
Shutdown Disconnect Switch Out.
Disconnects the input from the output during
shutdown.
Ground
+5.5 to +42V Output Voltage.
This pin also powers the AS1343 after startup.
Bypass this pin to GND with a
≥4.7µF
capacitor.
Feedback Pin.
Feedback input to the g
m
error amplifier. Connect a resistor divider
tap to this pin. The output voltage can be adjusted from 5.5V to 42V by:
V
OUT
= 1.25V[1 + (R
1
/R
2
)]
2
3
4
5
6
7
8
9
10
POK
GND
VCC
PGND
LX
SWOUT
GND
VOUT
FB
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AS1343
Data Sheet - 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 Character-
istics 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
VCC, EN, SWOUT, POK, FB to GND
VOUT, LX to GND
Thermal Resistance
Θ
JA
ESD
Latch-Up
Operating Temperature Range
Storage Temperature Range
Junction Temperature
-200
-40
-65
36.7
2.5
+150
+85
+150
125
Min
Max
5
45
Units
V
ºC/W
kV
mA
ºC
ºC
ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020C “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 MIL-Std. 883E 3015.7
methods
@25°C,
JEDEC 78
Comments
Package Body Temperature
+260
ºC
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AS1343
Data Sheet - 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
V
CC
= EN
=
3.6V, T
AMB
= -40 to +85ºC (unless otherwise specified). Typ values are at T
AMB
= +25ºC.
Table 3. Electrical Characteristics
Symbol
Parameter
Minimum Start-Up Voltage
V
CC
V
OUT
I
Q
I
SHDN
ΔV
LNR
ΔV
LDR
η
V
FB
I
FB
Supply Voltage
Output Voltage Range
Quiescent Current
Shutdown Current
V
CC
Line Regulation
Load Regulation
Efficiency
Feedback Voltage
Feedback Input Bias Current
V
FB
= 1.3V
V
OUT
= 6V, V
FB
=1.3V
EN = GND,
T
AMB
= +25ºC
EN = GND
V
OUT
= 15V, I
LOAD
= 1mA,
V
CC
= 1.8 to 3.6V
V
OUT
= 15V,
I
LOAD
= 0 to 20mA
L
1
= 6.8µH, V
OUT
= 12V, I
LOAD
= 50mA
1.225
0.05
0.01
85
1.25
1
1.275
100
Condition
V
OUT
= 12V, I
LOAD
= 1mA
0.9
5.5
22
0.02
Min
Typ
0.95
Max
1
3.6
42
30
1
3
Unit
V
V
V
µA
µA
µA
%/V
%/mA
%
V
nA
DC-DC Switches
I
LX(MAX)
R
LX
R
P_ON
I
LX_LEAK
I
P_LEAK
Control Inputs
V
IH
EN Input Threshold
V
IL
I
EN
POK Output
V
OL
POK Output Low Voltage
POK Output High Leakage
Current
POK Threshold
Oscillator
f
CLK
Oscillator Frequency
Maximum Duty Cycle
0.85
90
1
95
1.15
MHz
%
POK sinking 1mA
POK = 3.6V
Falling edge, referenced to V
OUT(NOM)
87
0.01
1
90
0.2
500
93
V
nA
%
EN Input Current
V
EN
= 0 to 3.6V
1
0.9V
≤
V
CC
≤
3.6V
0.8 x
V
CC
0.2 x
V
CC
LX Switch Current Limit
NMOS Switch On-
Resistance
PMOS Switch On-
Resistance
LX Leakage Current
Switch Leakage Current
I
LX
= 100mA
I
SWout
= -100mA
V
LX
= 42V
P-channel
1.45
0.9
0.3
15
10
1.5
Ω
1.0
nA
A
V
nA
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AS1343
Data Sheet - 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
Parts used for measurments: 6.8µH (MOS6020-682) Inductor, 10µF (GRM21BR60J106KE19) C
IN
and 4.7µF
(GRM32ER71H475KA88) C
OUT,
(PMEG4010BEA) D
1
;
Figure 3. Efficiency vs. Output Current; V
OUT
= 6V
90
80
70
Figure 4. Efficiency vs. Output Current; V
OUT
= 12V
90
80
70
Efficiency (%)
60
50
40
30
20
10
0
0.1
1
10
100
Vi n = 1.5V
Vi n = 2V
Vi n = 3V
Vi n = 3.6V
Efficiency (%)
60
50
40
30
20
10
0
0.1
1
10
100
Vi n = 1.5V
Vi n = 2V
Vi n = 3V
Vi n = 3.6V
Output Voltage (mA)
Figure 5. Efficiency vs. Output Current; V
OUT
= 18V
90
80
70
Output Current (mA)
Figure 6. Efficiency vs. Output Current; V
OUT
= 24V
90
80
70
Efficiency (%)
60
50
40
30
20
10
0
0.1
1
10
100
Vi n = 1.5V
Vi n = 2V
Vi n = 3V
Vi n = 3.6V
Efficiency (%)
60
50
40
30
20
10
0
0.1
1
10
100
Vi n = 2V
Vi n = 3V
Vi n = 3.6V
Output Current (mA)
Figure 7. Efficiency vs. Input Voltage; V
OUT
= 12V
90
80
70
Output Current (mA)
Figure 8. Efficiency vs. Input Voltage; I
OUT
= 10mA
90
80
70
Efficiency (%)
60
50
40
30
20
10
0
0.9
1.2
1.5 1.8
2.1
2.4
2.7
3
3.3
3.6
Iout = 1mA
Iout = 10mA
Iout = 50mA
Iout = 100mA
Efficiency (%)
60
50
40
30
20
10
0
0.9
1.2
1.5 1.8
2.1
2.4
2.7
3
3.3
3.6
Vout = 5.5V
Vout = 10V
Vout = 12V
Vout = 15V
Input Voltage (V)
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Input Voltage (V)
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