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Da ta sh ee t
AS1330
4M H z , L ow Vo l tag e, D C -D C St ep - U p C o n ve r te r
1 General Description
The AS1330 is a synchronous, low voltage, high efficiency DC-DC
boost converter running at a constant frequency of 4MHz. This very
high oscillator frequency allows the usage of a very a small and low
profile inductor with only 470nH. This results in a board space
requirement of only 43mm² for the complete solutions including all
external components.
AS1330 generates an output voltage between 1.8 and 3.3V from
input voltages down to 0.6V. Therefore it is ideal for application
powered by a single cell battery. AS1330 provides an output current
of 150mA @ 3.3V from a single cell.
To support high efficiency across the entire load range
the AS1330 is equipped with a synchronous rectifier and
features a power save mode for light loads.
To avoid harmful deep discharge of the battery during shutdown the
AS1330 is equipped with an output disconnect function.
AS1330 can either monitor the battery voltage (Sense pin) or report
the status of the output voltage (POK).
The AS1330 is available in a TDFN (2x2mm) 8-pin package.
2 Key Features
Input Voltage Range: 0.6V to 3.0V
Fixed Output Voltage: 1.8V, 3.0V
0.85V Low Start-Up Voltage
4MHz Fixed-Frequency
91% Efficiency
Delivers 150mA @ 3.3V (from Single AA Cell)
Output Disconnect during Shutdown
Anti-Ringing Control minimizes EMI
Power Okay and Sense pin
TDFN (2x2mm) 8-pin Package
Automatic Powersave Operation for light Loads
Figure 1. AS1330 - Typical Application Diagram
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3 Applications
L1
SW
AA Battery
VIN
VOUT
The AS1330 is ideal for space critical applications where ultra-small
size is critical as in medical diagnostic equipment, hand-held
instruments, digital cameras, MP3 players, GPS receivers, and PC
or Memory cards.
C1
AS1330-1.8
POK
EN
GND
SENSE
FB
On
Off
Revision 1.06
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V
OUT
1.8V
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Adjustable Output Voltage Range: 1.8V to 3.3V
AS1330
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
SENSE 1
FB 2
EN 3
POK 4
8 VIN
7 VOUT
6 SW
5 GND
9
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
Pin Name
SENSE
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2
FB
3
EN
4
POK
5
GND
6
SW
7
VOUT
VIN
8
9
Revision 1.06
Description
Sense Input.
Represents the input for the Power-OK behavior. This input can be used to supervise
the input or the output voltage via a resistor divider. If connected to GND the POK output is related to
V
OUT
.
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 1.8 to 3.3V by: V
OUT
= 0.8V[1 + (R
1
/R
2
)]
If the fixed output voltage version is used, connect this pin to VOUT.
Active-High Enable Input.
A logic LOW reduces the supply current to < 1 A.
Connect to pin VIN for normal operation.
Power-OK Output.
Active-High, open-drain output indicates an out-of-regulation condition. Connect
a 100kΩ pull-up resistor to pin OUT for logic levels. Leave this pin unconnected if the Power-OK
feature is not used.
Low Level: V
OUT
is out of Regulation
High Level: V
OUT
is within Regulation
Signal and Power Ground.
Provide a short, direct PCB path between this pin and the negative side
of the output capacitor(s).
Switch Pin.
Connect an inductor between this pin and V
IN
. Keep the PCB trace lengths as short and
wide as is practical to reduce EMI and voltage overshoot. If the inductor current falls to zero, or pin
EN is low, an internal 100Ω anti-ringing switch is connected from this pin to V
IN
to minimize EMI.
Note:
An optional Schottky diode can be connected between this pin and V
OUT
.
Output Voltage.
Bias is derived from V
OUT
when V
OUT
exceeds V
IN
. PCB trace length from V
OUT
to the output filter capacitor(s) should be as short and wide as is practical.
Input Voltage.
The AS1330 gets its start-up bias from V
IN
unless V
OUT
exceeds V
IN
, in which case
the bias is derived from V
OUT
. Thus, once started, operation is completely independent from V
IN
.
Operation is only limited by the output power level and the internal series resistance of the supply.
Exposed Pad.
The exposed pad must be connected to GND. Ensure a good connection to the PCB
to achieve optimal thermal performance.
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AS1330
AS1330
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
Parameter
Electrical Parameters
All Pins to GND
Input Current (latch-up immunity)
Electrostatic Discharge
Human Body Model
Temperature Ranges and Storage Conditions
Junction Temperature
Storage Temperature Range
-55
+150
+150
ºC
ºC
2
kV
-0.3
-100
5
100
V
mA
Norm: JEDEC 78
Min
Max
Units
Notes
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Package Body Temperature
+260
ºC
Humidity non-condensing
Moisture Sensitive Level
5
85
%
1
Revision 1.06
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).
Represents a max. floor life time of unlimited
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Norm: MIL 883 E method 3015
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AS1330
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
IN
= +1.2V, V
OUT
= +3.0V, V
EN
= +1.3V, L = 1 H, C1 = C2 = 10 F, typical values @ T
AMB
= +25ºC (unless otherwise specified).
All limits are guar-
anteed. 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
T
J
Input
Minimum Start-Up Voltage
V
IN
Regulation
V
OUT
Output Voltage Adjust Range
Output Voltage Accuracy
Feedback Voltage
2
Parameter
Operating Temperature Range
Operating Junction Temperature Range
Conditions
Min
-40
-40
Typ
Max
+85
+125
Units
I
OUT
= 1mA
I
OUT
= 1mA
0.6
0.85
1.8
V
OUT
>
V
IN
+ 0.6V
-3
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+3
for adjustable V
OUT
only
V
FB
= 0.8V
0.776
0.8
10
0.824
Feedback Input Current
Quiescent Current
(Powersave Operation)
V
OUT
= 3.15V
V
EN
= 0V
30
50
5
Quiescent Current (Shutdown)
Quiescent Current (Active)
0.05
3
in continuous mode
NMOS Switch Leakage
V
SW
= 3.6V
0.1
5
PMOS Switch Leakage
3
V
FB
I
FB
Operating Current
I
QPWS
I
QSHDN
I
Q
Switches
I
LKN
I
LKP
V
SW
= V
OUT
= 3.6V
R
ONNMOS
R
ONPMOS
I
NMOS
NMOS Switch On Resistance
PMOS Switch On Resistance
NMOS Current Limit
Maximum Duty Cycle
1
80
f
SW
Switching Frequency
3.2
Shutdown
V
ENH
V
ENL
I
EN
EN Input High
EN Input Low
no load
1.2
no load
EN Input Current
internal pull-down resistor
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Power-OK
4
POK Voltage Low
POK Leakage Current
I
POK
= 1mA
V
POK
= 3V, T
AMB
= 25ºC
Monitor V
IN
, Falling Edge
Monitor V
OUT
, Falling Edge
0.72
90
Power-OK Threshold
1.
2.
3.
4.
Guaranteed by design and verified in lab characterisation.
External Schottky diode is mandatory for output voltages higher than 3V.
V
OUT
is forced to 3.6V in production test.
The POK parameters are tested with proprietary test modes. The POK signal is valid from V
OUT
= 1.9V to 3.0V.
Revision 1.06
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3.0
V
%
V
nA
A
A
mA
A
A
Ω
Ω
mA
%
MHz
0.1
5
0.25
0.35
650
87
4
4.8
V
V
A
0.25
1.5
1
0.1
1
0.4
100
0.76
92.5
95
V
nA
V
%
Operating Voltage Range
1
al
0.9
V
V
3.0
id
°C
°C
单片机
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