AS3729

AS3729
5A Power Stage
General Description
The AS3729 is a companion power stage, intended to be used
with AS372x products. It cannot be used without a DCDC
controller. It contains the power FETs for 2 phases and is capable
to handle output currents of 2.5A per phase.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS3729, 5A Power Stage are listed
below:
Figure 1:
Added Value of Using AS3729
Benefits
Features
Support for single or dual phase operation
• 2 phases with separate control input
2 x 2.5A output stages are running on 3MHz
• Separate power NMOS & PMOS for 2.5A per phase
• Separate coil current feedback per phase
• Stand-alone zero-crossing operation
Over-temperature protection
• Integrated temperature monitoring
Cost effective, small package
• 16-pin WL-CSP: 1.615mm x 1.615mm, 0.4mm pitch
Applications
The device is a high current dual-phase DCDC and ideal for:
• Mobile phones
• Tablets
• Notebooks
ams Datasheet
[v1-24] 2015-Aug-13
Page 1
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Block Diagram
The functional blocks of this device for reference are
shown below:
Figure 2:
AS3729 Block Diagram
AS3729 Block Diagram: This figure shows the block diagram of the DCDC controller inside the Main PMIC and
the AS3729 Power Stage with all relevant system components.
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ams Datasheet
[v1-24] 2015-Aug-13
AS3729 − Pin Assignment
Pin Assignment
Figure 3:
Pin Diagram
Figure 4:
Pin Description
Pin Number
Pin Name
A1
CTRL1
Control IO for phase 1
B1
TEMP
ON/OFF control and temperature feedback
C1
AGND
Analog ground
D1
CTRL2
Control IO for phase 2
A2, B2
VSUP
Phase 1 positive supply terminal
C2, D2
VSUP
Phase 2 positive supply terminal
A3, B3
LX1
Phase 1 switching output to coil
C3, D3
LX2
Phase 2 switching output to coil
A4, B4
PVSS
Phase 1 negative supply terminal
C4, D4
PVSS
Phase 2 negative supply terminal
ams Datasheet
[v1-24] 2015-Aug-13
Description
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AS3729 − Absolute Maximum Ratings
Absolute Maximum Ratings
Stresses beyond those listed underAbsolute 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
Characteristicsis not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
Figure 5:
Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Units
Comments
Electrical Parameters
Supply voltage to ground 5V
pins
-0.5
7.0
V
Applicable for pins VSUPx, LXx,
CTRLx
Supply voltage to ground 3V
pins
-0.5
5.0
V
Applicable for pin TEMP
Voltage difference between
ground terminals
-0.5
0.5
V
Applicable for pins PVSS, AGND
Input current
(latch-up immunity)
-100
100
mA
Norm: JEDEC JESD78
Continuous Power Dissipation (TA = 70°C)
PT
Continuous power dissipation
1
W
PT (1) for WL-CSP16 package
(RTHJA ~ 55K/W)
kV
Norm: JEDEC JESD22-A114F
Electrostatic Discharge
ESD
Electrostatic discharge HBM
±1.5
Temperature Ranges and Storage Conditions
TA
RTHJA
TJ
Operating temperature
-40
85
Junction to ambient thermal
resistance
°C/W
Junction temperature
TStrg
Storage temperature range
TBODY
Package body temperature
RHNC
Relative humidity
(non-condensing)
MSL
Moisture sensitivity level
°C
-55
5
1
125
°C
125
°C
260
°C
85
%
RTHJA typical 55K/W
Norm IPC/JEDEC J-STD-020 (2)
Represents an unlimited floor
life time
Note(s) and/or Footnote(s):
1. Depending on actual PCB layout and PCB used.
2. 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”.
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ams Datasheet
[v1-24] 2015-Aug-13
AS3729 − Electrical Characteristics
Electrical Characteristics
Typical values are at VSUP = 3.8V, TA = 25°C (unless otherwise
specified). All limits are guaranteed. The parameters with Min
and Max values are guaranteed with production tests or SQC
(Statistical Quality Control) methods.
Figure 6:
Step Down DCDC Power Stage Parameters
Symbol
VIN
Parameter
Input voltage
ILIMIT
Peak coil current limit
ILOAD
Load current
Comments
Min
Typ
Max
Units
Pin VSUPx
2.5
5.5
V
Pin CTRLx
0
5.5
V
Pin TEMP
0
3.6
V
4
A
2.5
A
Single phase
Continuous load current
0
3 (1)
Peak load current
RPMOS
P-switch On resistance (2)
Single phase
40
70
mΩ
RNMOS
N-switch On resistance (2)
Single phase
30
50
mΩ
Switching frequency
Supplied by DCDC
controller
2.7
3
MHz
IQ_force_PWM
Quiescent current PWM
TEMP pin high, force
PWM mode active
6.2
mA
IQ_low_power
Quiescent current LP
TEMP pin high, low
power mode active
21
μA
Ipower_off
Power-Off current
No current into pin TEMP
±1
μA
Rdischarge
active discharge
Single phase
16
Ω
fSW
Note(s) and/or Footnote(s):
1. Maximum value only for pulsed peak current.
2. MOS transistor only without package parasitics.
ams Datasheet
[v1-24] 2015-Aug-13
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AS3729 − Parameters
Figure 7:
Step Down DCDC Power Stage External Components
Symbol
Parameter
Min
Typ
Max
Units
Note
External Components Per Phase
CFB
CVSUP
L
40
47
μF
Ceramic X5R or X7R, high
performance
20
22
μF
Ceramic X5R or X7R, cost
optimized
6
10
μF
Ceramic X5R or X7R
0.3
0.47
μH
3A rated, 3MHz
operation, low RON
Output capacitor
Input capacitor
Inductor
Parameters
Figure 8:
3.7V Efficiency vs. Output Current Combined Mode
AS3729 Step Down DCDC: Shows the
Efficiency of AS3729 with VSUP = 3.7V,
1.5MHz operation, TA = 25°C and
Coilcraft XAL5030-601MEB coil
95
90
85
Efficiency (%)
80
75
70
65
60
1.5V
1.2V
55
1.0V
50
1.5V, low noise
1.2V, low noise
45
40
0,001
1.0V, low noise
0,01
0,1
1
10
Output Current (A)
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ams Datasheet
[v1-24] 2015-Aug-13
AS3729 − Parameters
Figure 9:
3.7V Efficiency vs. Output Current Coil Comparison
AS3729 Step Down DCDC: Shows the
Efficiency of the AS3729 for different
coils @ 1.0V with VSUP=3.7V, 1.5MHz
operation and TA=25°C.
90
85
Efficiency (%)
80
75
70
65
60
VLF302515MT 0.47uH 23mΩ
55
SMP4012T 0.47uH 23mΩ
XFL4012 0.47uH 15.4mΩ
50
LQM2HPN 1uH 50mΩ
45
TFM252010 0.47uH 24mΩ
TFM201610 0.47uH 38mΩ
40
0,001
0,01
0,1
1
10
Output Current (A)
Figure 10:
3.7V Efficiency vs. Output Current Coil Comparison
Combined Mode
AS3729 Step Down DCDC: Shows the
Efficiency of the AS3729 for different
coils @ 1.0V with VSUP=3.7V, 1.5MHz
operation and TA=25°C.
90
85
Efficiency (%)
80
75
70
65
60
XAL4020 0.6uH 9mΩ
55
XFL4015 0.47uH 8.4mΩ
XFL4012 0.47uH 15.4mΩ
50
LQM2HPN 1uH 50mΩ (not combined)
TFM252010 0.47uH 24mΩ
45
40
0,001
SPM4012T 0.47uH 23mΩ
0,01
0,1
1
10
Output Current (A)
ams Datasheet
[v1-24] 2015-Aug-13
Page 7
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AS3729 − Parameters
Figure 11:
5.0V Efficiency vs. Output Current Coil Comparison
AS3729 Step Down DCDC: Shows the
Efficiency of the AS3729 for different
coils @ 1.0V with VSUP=5.0V, 1.5MHz
operation and TA=25°C.
90
85
Efficiency (%)
80
75
70
65
60
VLF302515MT 0.47uH 23mΩ
55
SPM4012T 0.47uH 23mΩ
50
XFL4012 0.47uH 15.4mΩ
45
TFM252010 0.47uH 24mΩ
LQM2HPN 1uH 50mΩ
TFM201610 0.47uH 38mΩ
40
0,001
0,01
0,1
1
10
Output Current (A)
Figure 12:
5.0V Efficiency vs. Output Current Coil Comparison
Combined Mode
AS3729 Step Down DCDC: Shows the
Efficiency of the AS3729 for different
coils @ 1.0V with VSUP=5.0V, 1.5MHz
operation and TA=25°C.
90
85
Efficiency (%)
80
75
70
65
60
XFL4015 0.47uH 8.4mΩ
SPM4012T 0.47uH 23mΩ
55
XFL4012 0.47uH 15.4mΩ
50
LQM2HPN 1uH 50mΩ (not
combined)
TFM252010 0.47uH 24mΩ
45
40
0,001
TFM252010 0.47uH 24mΩ
(not combined)
0,01
0,1
1
10
Output Current (A)
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ams Datasheet
[v1-24] 2015-Aug-13
AS3729 − Parameters
Figure 13:
3.7V Efficiency vs. Output Current XFL4012 Mode
Comparison
AS3729 Step Down DCDC: Shows the
Efficiency of the AS3729 in dual,
combined and single phase mode @
1.0V with VSUP=3.7V, 1.5MHz operation,
TA=25°C and Coilcraft XFL4012-471MEB
coil.
90
85
Efficiency (%)
80
75
70
65
60
dual phase
55
dual phase, low noise
combined mode
50
combined mode, low noise
low power mode
45
40
0,001
low power, low noise
0,01
0,1
1
10
Output Current (A)
Figure 14:
3.7V Efficiency vs. Output Current SPM4012T Mode
Comparison
AS3729 Step Down DCDC: Shows the
Efficiency of the AS3729 in dual,
combined and single phase mode @
1.0V with VSUP=3.7V, 1.5MHz operation,
TA=25°C and TDK SPM4012T-R47M coil.
90
85
Efficiency (%)
80
75
70
65
60
55
dual phase
50
dual phase, low noise
combined mode
45
combined mode, low noise
40
0,001
0,01
0,1
1
10
Output Current (A)
ams Datasheet
[v1-24] 2015-Aug-13
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AS3729 − Parameters
Figure 15:
3.7V Efficiency vs. Output Current TFM252010 Mode
Comparison
AS3729 Step Down DCDC: Shows the
Efficiency of the AS3729 in dual,
combined and single phase mode @
1.0V with VSUP=3.7V, 1.5MHz operation,
TA=25°C and TDK TFM252010A-R47M
coil.
90
85
Efficiency (%)
80
75
70
65
60
55
dual phase
50
dual phase, low noise
combined mode
45
combined mode, low noise
40
0,001
0,01
0,1
1
10
Output Current (A)
Figure 16:
3.7V Efficiency vs. Output Current XFL4012 Frequency
Comparison
AS3729 Step Down DCDC: Shows the
Efficiency of the AS3729 in dual phase
mode @ 1.0V with VSUP=3.7V, TA=25°C
and Coilcraft XFL4012-471MEB coil.
90
85
Efficiency (%)
80
75
70
65
60
55
3MHz
50
3MHz, low noise
45
1.5MHz
1.5MHz, low noise
40
0,001
0,01
0,1
1
10
Output Current (A)
Page 10
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ams Datasheet
[v1-24] 2015-Aug-13
AS3729 − Parameters
Figure 17:
3.7V Efficiency vs. Output Current LQMHPN Frequency
Comparison
AS3729 Step Down DCDC: Shows the
Efficiency of the AS3729 in dual phase
mode @ 1.0V with VSUP=3.7V, TA=25°C
and Murata LQM2HPN1R0MJH coil.
90
85
Efficiency (%)
80
75
70
65
60
55
3MHz
50
3MHz, low noise
45
1.5MHz
1.5MHz, low noise
40
0,001
0,01
0,1
1
10
Output Current (A)
ams Datasheet
[v1-24] 2015-Aug-13
Page 11
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AS3729 − Application Information
Application Information
Figure 18:
Typical Application Circuit
AS3729
VSUP
10uF
DCDC
0.6 – 1.5V
6A
3MHz
TEMP_SDx
TEMP
CTRL1_SDx
CTRL1
CTRL2_SDx
CTRL2
LX1
Vout ([email protected])
DVM, 10mV st eps
0.47uH
22uF
PVSS
PVSS
FB_SDx
LX2
FB_SDx
0.47uH
22uF
VSUP
10uF
AS3729 Typical Application: This figure shows the connection of the DCDC controller and the AS3729 Power
Stage.
Figure 19:
Layout Guidelines
Layout Guidelines: This figure shows
the recommended layout and
placement of the external components
for the 2-phase AS3729 Power Stage
L1
CIN1
COUT1
CTRL1
TEMP
GND
AS3729
XXXX
CTRL2
Vout
COUT2
CIN2
L2
FB
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ams Datasheet
[v1-24] 2015-Aug-13
AS3729 − Package Drawings & Markings
Package Drawings & Markings
Figure 20:
16-pin WL-CSP with 0.4mm Pitch
Top through view
Bottom view (ball side)
AS3729
XXXX
Note(s) and/or Footnote(s):
1. ccc Coplanarity.
2. All dimensions in μm.
Figure 21:
Package Code
XXXX
Tracecode
ams Datasheet
[v1-24] 2015-Aug-13
Page 13
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AS3729 − Ordering & Contact Information
Ordering & Contact Information
Figure 22:
Ordering Information
Ordering Code
Description
Delivery Form
Package
Delivery Quantity
AS3729-BWLT
Power stage for
multi-phase DCDC
Tape & Reel
16-pin WL-CSP
12000
AS3729-BWLM
Power stage for
multi-phase DCDC
Tape & Reel
16-pin WL-CSP
500
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Austria, Europe
Tel: +43 (0) 3136 500 0
Website: www.ams.com
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ams Datasheet
[v1-24] 2015-Aug-13
AS3729 − RoHS Compliant & ams Green Statement
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.
ams Datasheet
[v1-24] 2015-Aug-13
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AS3729 − Copyrights & Disclaimer
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.
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ams Datasheet
[v1-24] 2015-Aug-13
AS3729 − Document Status
Document Status
Document Status
Product Preview
Preliminary Datasheet
Datasheet
Datasheet (discontinued)
ams Datasheet
[v1-24] 2015-Aug-13
Product Status
Definition
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
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
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
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
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AS3729 − Revision Information
Revision Information
Changes from 1-22 (2013-Aug) to current revision 1-24 (2015-Aug-13)
Page
1-22 (2013-Aug) to 1-23 (2015-Aug-11)
Content was updated to the latest ams design
Updated Figure 5
4
Updated Figure 6
5
Updated Figure 7
6
Updated titles of figures 8, 10, 12, 13 & 17
6 - 11
Updated Figure 18
12
Updated Figure 22
14
1-23 (2015-Aug-11) to 1-24 (2015-Aug-13)
Updated Figure 21
13
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.
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ams Datasheet
[v1-24] 2015-Aug-13
AS3729 − Content Guide
Content Guide
ams Datasheet
[v1-24] 2015-Aug-13
1
1
1
2
General Description
Key Benefits & Features
Applications
Block Diagram
3
4
5
6
12
13
14
15
16
17
18
Pin Assignment
Absolute Maximum Ratings
Electrical Characteristics
Parameters
Application Information
Package Drawings & Markings
Ordering & Contact Information
RoHS Compliant & ams Green Statement
Copyrights & Disclaimer
Document Status
Revision Information
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