ams Datasheet Page 1
[v1-01] 2015-May-22 Document Feedback
AS1383
200mA, 3.5MHz DC-DC Step-Up
Converter
The AS1383 is a synchronous, high efficiency DC-DC boost
converter running at a constant frequency of 3.5MHz. This very
high oscillator frequency allows the usage of a low profile
inductor with only 1H. This results in a very small board space
requirement for the complete solutions including all external
components.
AS1383 generates an output voltage range from 2.7V to 5.0V.
In adjustable output voltage variant, the output voltage is
selected with an external resistor divider. In fixed output
voltage variant the VOUT is pre-programmed in 100mV steps,
and the external resistor divider is not needed.
AS1383 supports input voltages down to 2.7V. The device
provides an output current of 200mA. To support high
efficiency across the entire load range the AS1383 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 AS1383 is equipped with an output disconnect
function.
The AS1383 is available in a 6-pin WL-CSP package with 0.4mm
pitch.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS1383 are listed below:
Figure 1:
Added Value of Using AS1383
Benefits Features
Ideal for single Li-Ion battery powered applications •Wide Input Voltage Range (2.7V to 5.5V)
Extended battery life •High Efficiency up to 92%
Supports a variety of end applications
•Output Voltage Range: 2.7V to 5.0V (fixed and
adjustable variants)
•3.5MHz Fixed-Frequency
•Output Current up to 200mA
•Automatic Powersave Operation for light Loads
•Output Disconnect during Shutdown
•Anti-Ringing Control minimizes EMI
Cost effective, small package •6-pin WL-CSP with 0.4mm pitch
General Description
Page 2 ams Datasheet
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AS1383 − General Description
Applications
The AS1383 is ideal for space critical applications where small
size is mandatory as in USB or portable HDMI applications,
mobile phones, PDAs, portable media players or digital
cameras.
Figure 2:
AS1383 - Typical Application Diagram – Fixed VOUT Variant
Figure 3:
AS1383 - Typical Application Diagram – Variable VOUT Variant
AS1383
VIN
SW
EN
VOUT
FB
GND
VOUT = 2.7V – 5.0V
VIN = 2.7V – 5.5V
CIN
10uF
COUT
4.7uF
L
1uH
AS1383
VIN
SW
EN
VOUT
FB
GND
VOUT = 2.7V – 5.0V
VIN = 2.7V – 5.5V
CIN
10uF
COUT
4.7uF
L
1uH R1
R2
ams Datasheet Page 3
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AS1383 − Pin Assignment
Figure 4:
Pin Assignment for WL-CSP
Figure 5:
Pin Description
Note(s) and/or Footnote(s):
1. An optional Schottky diode can be connected between this pin and VOUT.
Pin Assignments: Shows the TOP view
pin assignment of the AS1383.
Pin Number Pin Name Description
A1 VIN
Input Voltage. The AS1383 gets its start-up bias from VIN unless VOUT
exceeds VIN, in which case the bias is derived from VOUT. Thus, once
started, operation is completely independent from VIN.
Operation is only limited by the output power level and the internal series
resistance of the supply.
A2 GND Signal and Power Ground
B1 SW
Switch Pin. Connect an inductor between this pin and VIN. 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
100 anti-ringing switch is connected from this pin to VIN to minimize
EMI. (1)
B2 VOUT
Output Voltage. Bias is derived from VOUT when VOUT exceeds VIN. PCB
trace length from VOUT to the output filter capacitor(s) should be as short
and wide as is practical.
C1 EN
Active-High Enable Input. A logic LOW reduces the supply current to
< 1A.
Connect to pin VIN for normal operation.
C2 FB Feedback Pin. Feedback input to the gm error amplifier, connect this pin
to VOUT
Pin Assignment
A2
C1 C2
B2B1
A1
Page 4 ams Datasheet
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AS1383 − Absolute Maximum Ratings
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. These are stress
ratings only. Functional operation of the device at these or any
other conditions beyond those indicated under Electrical
Characteristics is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
Figure 6:
Absolute Maximum Ratings
Note(s) and/or Footnote(s):
1. The reflow peak soldering temperature (body temperature) is specified according IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity
Classification for Nonhermetic Solid State Surface Mount Devices”
Symbol Parameter Min Max Units Comments
Electrical Parameters
VGND All pins to GND -0.3 VOUT
+ 0.3 V
ISCR Input Current
(latch-up immunity) -100 100 mA Norm: JEDEC 78
Electrostatic Discharge
ESDHBM Electrostatic Discharge HBM ±2 kV Norm: MIL 883 E method 3015
Temperature Ranges and Storage Conditions
TAMB Operating Temperature -40 85 °C
θJA Thermal Resistance 110 °C/W
TJJunction Temperature 150 °C
TSTRG Storage Temperature Range -55 125 °C
TBODY Package Body Temperature 260 °C Norm IPC/JEDEC J-STD-020 (1)
RHNC Relative Humidity
non-condensing 585 %
MSL Moisture Sensitivity Level 1 Represents an unlimited floor life
time
Absolute Maximum Ratings
ams Datasheet Page 5
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AS1383 − Electrical Characteristics
All limits are guaranteed. The parameters with min and max
values are guaranteed with production tests or SQC (Statistical
Quality Control) methods.
Figure 7:
Electrical Characteristics
Symbol Parameter Note Min Typ Max Unit
VIN Input Voltage VIN 2.7 5.5 V
Regulation
VOUT
Output Voltage,
Output voltage can be
trimmed to any values
between Min and Max
2.7 5.0 V
VOUT_TOL Output Voltage Tolerance -3 +3 %
VO_Ripple Output Ripple Voltage IOUT = 150mA 20 mVpp
Operating Current
IOUT Output Current
VIN ≤ 3.0V
3.0V < VIN ≤ 3.7V
VIN > 3.7V
50
100
200
mA
IQSHDN Quiescent Current
(Shutdown) EN = GND 1.5 uA
IQPWS Quiescent Current
(Powersave operation) 25 uA
Line transient response
VIN = Step from 3.0V to 3.5V,
VOUT=5.0V
IOUT = 100mA
80 mV
Load transient response
VIN = 3.6V, VOUT=5.0V
IOUT = stepping from 10mA to
100mA
100 mV
Electrical Characteristics
Page 6 ams Datasheet
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AS1383 − Electrical Characteristics
Switches
ILK
Leakage current from
battery to VOUT EN = GND 1 uA
RONMOS NMOS Switch ON
Resistance 0.25 Ω
RONPMOS PMOS Switch ON
Resistance 0.35 Ω
INMOS NMOS Current Limit 650 mA
fSW Switching Frequency 3.5 MHz
Start-up time
Time from active EN to start
switching, no load until VOUT
is stable
300 us
Shutdown
VENH EN Input High No load 1.2 V
VENL EN Input Low No load 0.25 V
IEN EN Input Current Internal pull-down resistor 0.01 1.0 uA
Thermal Protection
Thermal shutdown
•10°C Hysteresis
•Thermal protection stops
switching, supply
disconnect not supported
150 °C
Symbol Parameter Note Min Typ Max Unit
ams Datasheet Page 7
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AS1383 − Detailed Descriptions
The AS1383 can operate from 2.7V to 5.5V and features fixed
frequency (3.5MHz) and current mode PWM control for
exceptional line- and load regulation. With low RDS(ON) and
gate charge internal NMOS and PMOS switches, the device
maintains high-efficiency from light to heavy loads.
Modern portable devices frequently spend extended time in
low-power or standby modes, switching to high power-drain
only when certain functions are enabled. The AS1383 is ideal
for portable devices since it maintain high-power conversion
efficiency over a wide output power range, thus increasing
battery life in these types of devices.
In addition to high-efficiency at moderate and heavy loads, the
AS1383 includes an automatic powersave mode that improves
efficiency of the power converter at light loads. The powersave
mode is initiated if the output load current falls below a factory
programmed threshold.
Figure 8:
AS1383 Block Diagram
Detailed Descriptions
PWM
Control
Sync Drive
Control
3.5MHz Ramp
Generator
Slope
Compensation
Shu tdown
Control
Powersave
Ope ration
Control
1.25V
Ref
gm Error
Amp
Σ
PWM
Comp
-
Shutdown R
C
C
C
C
P2
Current
Sense
Powersave
GND
SW
VIN
EN
FB
VOUT
C
IN
10uF
2.7V to 5.5V
L1
1uH
On
Off
2.7V – 5.0V
0.25Ω
0.35Ω
AS1383
C
OUT
4.7uF
Page 8 ams Datasheet
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AS1383 − Detailed Descriptions
Low-Noise Fixed-Frequency Operation
Oscillator
The AS1383 switching frequency is internally fixed at 3.5MHz
allowing the use of very small external components.
Current Sensing
A signal representing the internal NMOS-switch current is
summed with the slope compensator. The summed signal is
compared to the error amplifier output to provide a peak
current control command for the PWM. Peak switch current is
limited to approximately 650mA independent of VIN or VOUT.
Zero Current Comparator
The zero current comparator monitors the inductor current to
the output and shuts off the PMOS synchronous rectifier once
this current drops to 20mA (approx.). This prevents the inductor
current from reversing polarity and results in improved
converter efficiency at light loads.
Anti-Ringing Control
Anti-ringing control circuitry prevents high-frequency ringing
on pin SW as the inductor current approaches zero. This is
accomplished by damping the resonant circuit formed by the
inductor and the capacitance on pin SW (CSW).
Powersave Operation
In light load conditions, the integrated powersave feature
removes power from all circuitry not required to monitor VOUT.
When VOUT has dropped approximately 1% from nominal, the
device powers up and begins normal PWM operation.
C2 recharges, causing the AS1383 to re-enter powersave mode
as long as the output load remains below the powersave
threshold. The frequency of this intermittent PWM is
proportional to load current; i.e., as the load current drops
further below the powersave threshold, the AS1383 turns on
less frequently. When the load current increases above the
powersave threshold, the AS1383 will resume continuous,
seamless PWM operation.
Shutdown
When pin EN is low the AS1383 is switched off and <1A current
is drawn from the battery; when pin EN is high the device is
switched on. If EN is driven from a logic-level output, the logic
high-level (on) should be referenced to VOUT to avoid
intermittently switching the device on. In shutdown the battery
input is disconnected from the output.
ams Datasheet Page 9
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AS1383 − Detailed Descriptions
Thermal Overload Protection
To prevent the AS1383 from short-term misuse the chip
includes a thermal overload protection. To block the normal
operation the switching of PMOS and NMOS are stopped during
the thermal protection, but the VOUT follows the VBAT. The
device is in thermal shutdown when the junction temperature
exceeds 150°C. To resume the normal operation the
temperature has to drop below 140°C.
Note(s): Continuing operation in thermal overload conditions
may damage the device and is considered bad practice.
VOUT Programming with External Resistor Divider
In adjustable VOUT variant AS1383 output voltage can be
selected with external resistor diver connected to the FB pin as
shown in Figure 3. In this case, the VOUT follows the function:
In fixed output voltage variant the VOUT is programmed
internally, and the VOUT if connected directly to FB pin.
A higher resistance of R1 and R2 will result in a lower leakage
current. Resistance between 10k and 500k is recommended
for R2. It is recommended to keep VIN 500mV higher than VOUT.
(EQ1)
VOUT 1
R1
R2
------
+
1.25V⋅=
Page 10 ams Datasheet
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AS1383 − Typical Operating Characteristics
The following figures are summarizing the AS1383 efficiency as
function of load current and input voltage.
Figure 9:
AS1383 Efficiency vs. Load Current
Figure 10:
AS1383 Efficiency vs. Input Voltage (VOUT = 5.0V, ILOAD=100mA)
Typical Operating
Characteristics
Efficiency (%)
50
55
60
65
70
75
80
85
90
95
100
0.0001 0.001 0.01 0.1 1
Vin=2.5V, Vout=5.0V, T=25°C
Vin=3.5V, Vout=5.0V, T=25°C
Vin=4.5V, Vout=5.0V, T=25°C
Output Current (A)
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sŝŶs
Page 12 ams Datasheet
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AS1383 − External Component Selection
An external inductor (L) and two capacitors (CIN and COUT) are
needed for the AS1383 functionality. With the adjustable
variant also two external resistors are needed to program the
VOUT voltage. This section gives recommendations for the
components to be used.
Inductor Selection
Figure 13:
Recommended Inductors
Capacitor Selection
When choosing ceramic capacitors for CIN and COUT, the X5R or
X7R dielectric formulations are recommended. These
dielectrics have the best temperature and voltage
characteristics for a given value and size. Y5V and Z5U dielectric
capacitors, aside from their wide variation in capacitance over
temperature, become resistive at high frequencies and
therefore should not be used.
Note that the last components in the tables are the ones that
are used in the evaluation board instead of the smallest possible
components.
Figure 14:
Recommended CIN Capacitors
Part Number LDCR Current
Rating
Dimensions in
mm (L / W / H) Manufacturer
CIG22H1R0MAE 1µH 65mΩ 1.8A 2.5 x 2.0 x 1.0 www.samsungsem.com
XFL4020-102 1µH 11.9mΩ 11A 4.3 x 4.3 x 2.1 www.coilcraft.com
DFE201610E 1µH 96mΩ 2.2A 2.0 x 1.6 x 1.0 www.toko.co.jp
LQM18PW1R0MCH 1µH 288mΩ 0.95A 1.6 x 0.8 x 0.5 www.murata.com
Part Number CTC
Code
Voltage
Rating
Dimensions in
mm (L / W / H) Manufacturer
GRM219R61A106ME47 10µF X5R 10V 2.0 x 1.2 x 1.25 www.murata.com
CL10A106KP8NNNC 10µF X5R 10V 1.6 x 0.8 x 0.8mm www.samsungsem.com
External Component Selection
ams Datasheet Page 13
[v1-01] 2015-May-22 Document Feedback
AS1383 − External Component Selection
Figure 15:
Recommended COUT Capacitors
Because ceramic capacitors lose a lot of their initial capacitance
at their maximum rated voltage, it is recommended that either
a higher input capacity or a capacitance with a higher rated
voltage is used.
Feedback Resistor Selection
Layout Recommendation
The high-speed operation of the AS1383 requires proper layout
for optimum performance. Figure 16 shows the recommended
component layout.
•A large ground pin copper area will help to lower the
device temperature.
•A multi-layer board with a separate ground plane is
recommended.
•Traces carrying large currents should be direct.
•Trace area at pin FB should be as small as is practical.
•The lead-length to the battery should be as short as is
practical.
Part Number CTC
Code
Voltage
Rating
Dimensions in
mm (L/W/H) Manufacturer
GRM21BR61E475MA12 4.7µF X5R 25V 2.0 x 1.2 x 1.25 www.murata.com
GRM219R61A106ME47 10µF X5R 10V 2.0 x 1.2 x 1.25 www.murata.com
CL10A475KP8NNNC 4.7µF X5R 10V 1.6 x 0.8 x 0.8mm www.samsungsem.com
CL10A106KP8NNNC 10µF X5R 10V 1.6 x 0.8 x 0.8mm www.samsungsem.com
ams Datasheet Page 17
[v1-01] 2015-May-22 Document Feedback
AS1383 − Ordering & Contact Information
The figure below shows the ordering codes for Tape & Reel
deliveries (suffix T in the ordering code). It is also possible to
have all the variants on mini reels, when the ordering codes are
AS1383-BWLM-xx (where suffix M stands for a mini reel). The
components are the same in both reel sizes.
Figure 19:
Ordering Information
Buy our products or get free samples online at:
www.ams.com/ICdirect
Technical Support is available at:
www.ams.com/Technical-Support
Provide feedback about this document at:
www.ams.com/Document-Feedback
For further information and requests, e-mail us at:
ams_sales@ams.com
For sales offices, distributors and representatives, please visit:
www.ams.com/contact
Headquarters
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten
Austria, Europe
Tel: +43 (0) 3136 500 0
Website: www.ams.com
Ordering Code VOUT Delivery Form Package
AS1383-BWLT-ES - Tape & Reel WL-CSP
AS1383-BWLT-AD Adjustable Tape & Reel WL-CSP
AS1383-BWLT-45 4.5V Tape & Reel WL-CSP
AS1383-BWLT-xx Tape & Reel WL-CSP
AS1383-BWLT-50 5.0V Tape & Reel WL-CSP
Ordering & Contact Information
Page 18 ams Datasheet
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AS1383 − RoHS Compliant & ams Green Statement
RoHS: The term RoHS compliant means that ams AG products
fully comply with current RoHS directives. Our semiconductor
products do not contain any chemicals for all 6 substance
categories, including the requirement that lead not exceed
0.1% by weight in homogeneous materials. Where designed to
be soldered at high temperatures, RoHS compliant products are
suitable for use in specified lead-free processes.
ams Green (RoHS compliant and no Sb/Br): ams Green
defines that in addition to RoHS compliance, our products are
free of Bromine (Br) and Antimony (Sb) based flame retardants
(Br or Sb do not exceed 0.1% by weight in homogeneous
material).
Important Information: The information provided in this
statement represents ams AG knowledge and belief as of the
date that it is provided. ams AG bases its knowledge and belief
on information provided by third parties, and makes no
representation or warranty as to the accuracy of such
information. Efforts are underway to better integrate
information from third parties. ams AG has taken and continues
to take reasonable steps to provide representative and accurate
information but may not have conducted destructive testing or
chemical analysis on incoming materials and chemicals. ams AG
and ams AG suppliers consider certain information to be
proprietary, and thus CAS numbers and other limited
information may not be available for release.
RoHS Compliant & ams Green
Statement
ams Datasheet Page 19
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AS1383 − Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 30, 8141
Unterpremstaetten, Austria-Europe. Trademarks Registered. All
rights reserved. The material herein may not be reproduced,
adapted, merged, translated, stored, or used without the prior
written consent of the copyright owner.
Devices sold by ams AG are covered by the warranty and patent
indemnification provisions appearing in its General Terms of
Trade. ams AG makes no warranty, express, statutory, implied,
or by description regarding the information set forth herein.
ams AG reserves the right to change specifications and prices
at any time and without notice. Therefore, prior to designing
this product into a system, it is necessary to check with ams AG
for current information. This product is intended for use in
commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or
high reliability applications, such as military, medical
life-support or life-sustaining equipment are specifically not
recommended without additional processing by ams AG for
each application. This product is provided by ams AG “AS IS”
and any express or implied warranties, including, but not
limited to the implied warranties of merchantability and fitness
for a particular purpose are disclaimed.
ams AG shall not be liable to recipient or any third party for any
damages, including but not limited to personal injury, property
damage, loss of profits, loss of use, interruption of business or
indirect, special, incidental or consequential damages, of any
kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation
or liability to recipient or any third party shall arise or flow out
of ams AG rendering of technical or other services.
Copyrights & Disclaimer
Page 20 ams Datasheet
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AS1383 − Document Status
Document Status Product Status Definition
Product Preview Pre-Development
Information in this datasheet is based on product ideas in
the planning phase of development. All specifications are
design goals without any warranty and are subject to
change without notice
Preliminary Datasheet Pre-Production
Information in this datasheet is based on products in the
design, validation or qualification phase of development.
The performance and parameters shown in this document
are preliminary without any warranty and are subject to
change without notice
Datasheet Production
Information in this datasheet is based on products in
ramp-up to full production or full production which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade
Datasheet (discontinued) Discontinued
Information in this datasheet is based on products which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade, but these products have been superseded and
should not be used for new designs
Document Status
ams Datasheet Page 21
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AS1383 − Revision Information
Note(s) and/or Footnote(s):
1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
2. Correction of typographical errors is not explicitly mentioned.
Changes from 1-00 (2015-May-06) to current revision 1-01 (2015-May-22) Page
Updated Figure 13 12
Updated Figure 19 17
Revision Information
Page 22 ams Datasheet
Document Feedback [v1-01] 2015-May-22
AS1383 − Content Guide
1 General Description
1 Key Benefits & Features
2 Applications
3 Pin Assignment
4Absolute Maximum Ratings
5 Electrical Characteristics
7 Detailed Descriptions
8 Low-Noise Fixed-Frequency Operation
8 Oscillator
8 Current Sensing
8 Zero Current Comparator
8 Anti-Ringing Control
8 Powersave Operation
8Shutdown
9 Thermal Overload Protection
9 VOUT Programming with External Resistor Divider
10 Typical Operating Characteristics
12 External Component Selection
12 Inductor Selection
12 Capacitor Selection
13 Feedback Resistor Selection
13 Layout Recommendation
15 Package Drawings & Markings
17 Ordering & Contact Information
18 RoHS Compliant & ams Green Statement
19 Copyrights & Disclaimer
20 Document Status
21 Revision Information
Content Guide
