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ams AG
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Datasheet
AS1302
5V/30mA Adaptive Inductorless Boost Converter
1 General Description
The AS1302 is a 30mA inductorless boost converter
using a double H-bridge charge-pump topology with two
external flying capacitors. The AS1302 charge pump
features 1:2 and 2:3 operation modes as well as a 1:1
operation mode where the input is directly connected to
the output.
The AS1302 runs on a 1.2MHz fixed frequency and is
utilized with a low noise regulation scheme to allow
usage together with sensitive RF circuitry from the same
battery supply. Additionally to increase efficiency the
AS1302 switches to 49kHz at light loads.
Designed to reside in portable and space limited
equipment the 1.2MHz charge pump converts a 2.9V to
5.15V input to regulated 5V output with 3% accuracy.
The shutdown function reduces the supply current to
<1µA and disconnects the load from the output. The
integrated soft-start circuitry prevents high inrush
currents being drawn from the battery during start-up.
The AS1302 includes built-in under-voltage lockout,
short circuit-, and thermal protection circuitry.
2 Key Features
!
!
!
!
!
!
!
!
!
!
!
!
Up to 90% Efficiency
Regulated 5V Output
Automatic Mode Switching
<1µA Shutdown Current
Startup with Full Load (within 1ms)
Up to 30mA Load Current
Short Circuit Protection
Soft-Start
The AS1302 is available in TDFN (3x3x0.8mm) 10-pin
and an extremely small 1.2x1.2mm WL-CSP 8-bumps
package with 0.4mm pitch.
Figure 1. AS1302 - Typical Application Diagram
C
FLY1
220nF
C1+
C1-
VOUT
V
OUT
= 5V
C
OUT
2.2µF
GND
C2+
C
FLY2
C2-
220nF
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V
BATT
2.9V to 5.15V
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Output Disconnected During Shutdown
No Inductor Required
Small External Components Required
(C
OUT
=2.2µF, C
FLY
=220nF)
!
Low Noise Fixed Frequency (1.2MHz, 49kHz)
Charge Pump:
!
- 1:1 Battery Feed Through Mode
- 2:3 Single Phase Mode
- 1:2 Single Phase Mode
Package Options:
- TDFN (3x3x0.8mm) 10-pin
- WL-CSP 8-bumps with 0.4mm Pitch
3 Applications
The device is ideal for two or three AA cells or a single
Li-Ion battery cell to 5V conversion, mobile phones,
portable instruments, microprocessor based systems
and remote data-acquisition systems.
VBATT
C
BAT
2.2µF
On
Off
AS1302
EN
Revision 1.03
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2.9V to 5.15V Input Voltage
AS1302
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Through View)
C1-
GND 1
C1- 2
NC 3
C1+ 4
GND
VOUT 5
6 C2+
TDFN (3x3x0.8mm) 10-pin
10 EN
9 VBATT
A1
GND
A2
EN
AS1302
8 C2-
7 NC
C1+
B1
B3
VBATT
C1
C2
C3
Pin Descriptions
Pin Name
C1-
GND
EN
C1+
VBATT
VOUT
C2+
C2-
Table 1. Pin Descriptions
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Pin Number
A1
A2
A3
B1
B3
C1
C2
C3
Revision 1.03
VOUT C2+ C2-
WL-CSP 8-bumps
Description
Connector 1-.
Negative terminal of flying cap 1.
Ground.
Enable.
(operating if EN = 1). Set this digital input to logic high for normal
operation. For shutdown, set to logic low.
Connector 1+.
Positive terminal of flying cap 1.
+2.9V to 5.15V Input Voltage.
Bypass this pin to GND with a
≥2.2µF
low
ESR ceramic capacitor.
+5V Output Voltage.
This pin must be bypassed with a
≥2.2µF
low ESR
ceramic capacitor.
Connector 2+.
Positive terminal of flying cap 2.
Connector 2-.
Negative terminal of flying cap 2.
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A3
AS1302
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
Section 6 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
All pins to GND
Operating Temperature Range
Storage Temperature Range
ESD
-0.3
-40
-65
2
+7.0
+85
+125
V
ºC
ºC
kV
V
Package Body Temperature
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500
CDM JESD22-C101C
methods
+260
ºC
Revision 1.03
HBM MIL-Std. 883E 3015.7
methods
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).
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Parameter
Min
Max
Units
Notes
AS1302
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
V
BATT
= 2.9V to 5.15V, V
OUT
= 5V, C
OUT
= C
BAT
= 2.2µF, C
FLY1
= C
FLY2
=220nF, T
AMB
= -40 to +85ºC. Typical values
are at T
AMB
= +25ºC and
V
IN
= 3.3V, unless otherwise specified.
Table 3. Electrical Characteristics
Symbol
Parameter
Conditions
Rising V
BATT
Falling V
BATT
2.4
2.9
I
OUT
= 0mA, 15mA
V
BATT
= 5.4V, I
OUT
= 10~30mA
V
BATT
= 4.3V, I
OUT
= 10~30mA
V
BATT
= 3.3V, I
OUT
= 10~30mA
1:1 / 2:3 mode, falling V
BATT
2:3 / 1:2 mode, falling V
BATT
4.85
5.0
2
3
3
Min
Typ
2.8
2.5
Max
2.9
Units
V
V
BATT(off)
Undervoltage Lockout
V
BATT
V
OUT
Battery Supply Voltage
Output Voltage Accurracy
ΔV
O
/ΔI
O23
Load Regulation in 2:3 Mode
ΔV
O
/ΔI
O12
Load Regulation in 1:2 Mode
V
tgr11/23
V
tgr23/12
Mode Switching Voltage
I
OUT
V
ripple
I
inr
I
short
η
12
η
23
I
OP12
I
OP23
I
OP11
I
OFF
V
IH
V
IL
Load Current
Output Voltage Ripple
Inrush Current
2
Short-Circuit Current
Efficiency in Switching Mode
Operating Quiescent Current
Shutdown Current
Input Levels
ch
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Input High Level
Input Low Level
Timing
f
OSC
Oscillator Frequency
Startup Time
Te
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START
T
OFF
Thermal Regulation
Temperature Shutdown
Temperature rising
Hysteresis
145
10
ºC
1. The device is tested in a proprietary test mode.
2. The inrush current is limited by the internal soft-start circuitry.
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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5.1
3.6
V
Mode switching voltage hysteresis
150
mV
1
ΔV
O
/ΔI
O11
Load Regulation in 1:1 Mode
V
BATT
= 3.6V, I
OUT
= 30mA
V
BATT
= 3.6V, I
OUT
= 2mA
22
40
1:2 mode, V
BATT
= 2.9V,
I
OUT
= 30mA
2:3 mode, V
BATT
= 3.8V,
I
OUT
= 30mA
85
85
V
BATT
= 3.4V (1:2 mode without load)
V
BATT
= 4.5V (2:3 mode without load)
V
BATT
= 5.3V (1:1 mode without load)
240
170
100
EN = 0V
0.01
pin EN
1.1
0.0
V
BATT
= 3.6V, I
OUT
= 30mA
V
BATT
= 3.6V, I
OUT
= 2mA
0.9
40
1.2
49
0.5
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V
5.15
5.15
V
V
mV/mA
30
mA
mV
PP
mV
PP
mA
150
150
mA
%
%
300
230
150
1
µA
µA
5.5
0.4
V
V
1.5
65
1
MHz
kHz
ms
V
BATT(on)
Undervoltage Lockout
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