ZSPM4013 Data Sheet Rev. 1.10

Data Sheet
Rev. 1.10 / October 2012
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
Power and Precision
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
Brief Description
Benefits
The ZSPM4013 is a DC/DC synchronous switching
regulator with fully integrated power switches,
internal compensation, and full fault protection.
The 1MHz switching frequency enables using
small filter components, resulting in reduced board
space and reduced bill-of-materials costs.

The ZSPM4013 utilizes current mode feedback in
normal regulation pulse-width modulation (PWM)
mode. When the regulator is disabled (EN pin is
low), the ZSPM4013 draws less than 10µA quiescent current.










Junction operating temperature -40°C to 125°C
Packaged in a 16pin QFN (3x3mm)

Related ZMDI Products

ZSPM4011/ZSPM4012: 1A/2A synchronous
buck converters, available with adjustable output from 0.9 to 5V or fixed output voltages at
1.5V, 1.8V, 2.5V, 3.3V, 5.0V
(16-lead 3x3mm QFN)
ZSPM1000: >5A single-phase, single-rail, true
digital PWM controller (24-lead 4x4mm QFN)

ZSPM4013 Application Circuits
Adjustable Output
BST
VCC
VCC
CBYPASS
EN
CBST
VSW
EN
VOUT
LOUT
ZSPM4013

Physical Characteristics
RTOP
COUT
RBOT
FB
VOUT
10 kΩ
(optional)
PGND

Evaluation Kit
Documentation

GND

Output voltage options (depends on order code):
 Fixed output voltages: 1.5V, 1.8V, 2.5V,
3.3V, or 5V with +/- 2% output tolerance
 Adjustable output voltage range: 0.9V to 5V
with +/- 1.5% reference
Wide input voltage range:
6V to 18V
1MHz +/- 10% fixed switching frequency
3A continuous output current
High efficiency – up to 95%
Current mode PWM control with pulsefrequency modulation (PFM) mode for
improved light load efficiency
Voltage supervisor for VOUT reported at the PG
pin
Input supply under voltage lockout
Soft start for controlled startup with no
overshoot
Full protection for over-current, overtemperature, and VOUT over-voltage
Less than 10µA in Disabled Mode
Low external component count
Available Support
PG
PG
Fixed Output
VCC
BST
VCC
CBYPASS
EN
ZSPM4013


EN
PGND
Features

GND
The ZSPM4013 integrates a wide range of
protection circuitry, including input supply undervoltage lockout, output voltage soft start, current
limit, VOUT over-voltage, and thermal shutdown.
The ZSPM4013 includes supervisory reporting
through the PG (Power Good) open drain output to
interface other components in the system.
Increased battery life
Minimal external component count
(3 capacitors, 1 inductor)
Inherent fault protection and reporting
VSW
CBST
VOUT
LOUT
COUT
FB
VOUT
10kΩ
(optional)
PG
PG
For more information, contact ZMDI via [email protected]
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10 — October 10, 2012. All rights reserved. The material contained herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
ZSPM4013 Block Diagram
PG
EN
VCC
4.2V
VCC
VCC
Under-Voltage
Protection
MONITOR
&
CONTROL
VCC
Over-Voltage
Protection
Oscillator
Typical Applications





Wireless access points,
cable modems
Set-top boxes
DVD, LCD, LED supplies
Portable products,
including GPS, smart
phones, tablet PCs
Printers
Bootstrap
Voltage
Thermal
Protection
Ramp
Generator
Vref
&
Soft Start
FB
BST
Over Current
Protection
VCC

CBST
Gate
Drive
VSW
Gate Drive
Control
VOUT
LOUT
COUT
Comparator
Gate
Drive
Error Amp
Compensation
Network
PGND
Vref
RTOP
FB
PFM Mode
Comparator
RBOT
GND
Ordering Information
Ordering Code
Description
Package
ZSPM4013AA1W00
ZSPM4013, 3A Synchronous Buck Converter: adjustable output, 0.9V to 5V,
16-pin 3x3mm QFN
ZSPM4013, 3A Synchronous Buck Converter: fixed output, 1.5V,16-pin 3x3mm QFN
ZSPM4013, 3A Synchronous Buck Converter: fixed output, 1.8V,16-pin 3x3mm QFN
ZSPM4013, 3A Synchronous Buck Converter: fixed output, 2.5V,16-pin 3x3mm QFN
ZSPM4013, 3A Synchronous Buck Converter: fixed output, 3.3V,16-pin 3x3mm QFN
ZSPM4013, 3A Synchronous Buck Converter: fixed output, 5.0V,16-pin 3x3mm QFN
ZSPM4013KIT, Evaluation Kit for 3A Synchronous Buck Converter
7” reel with 1000 ICs
ZSPM4013AA1W15
ZSPM4013AA1W18
ZSPM4013AA1W25
ZSPM4013AA1W33
ZSPM4013AA1W50
ZSPM4013KIT
Sales and Further Information
www.zmdi.com
7” reel with 1000 ICs
7” reel with 1000 ICs
7” reel with 1000 ICs
7” reel with 1000 ICs
7” reel with 1000 ICs
Kit
[email protected]
Zentrum Mikroelektronik
Dresden AG
Grenzstrasse 28
01109 Dresden
Germany
ZMD America, Inc.
1525 McCarthy Blvd., #212
Milpitas, CA 95035-7453
USA
Zentrum Mikroelektronik
Dresden AG, Japan Office
2nd Floor, Shinbashi Tokyu Bldg.
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
ZMD FAR EAST, Ltd.
3F, No. 51, Sec. 2,
Keelung Road
11052 Taipei
Taiwan
Zentrum Mikroelektronik
Dresden AG, Korea Office
U-space 1 Building
11th Floor, Unit JA-1102
670 Sampyeong-dong
Bundang-gu, Seongnam-si
Gyeonggi-do, 463-400
Korea
Phone +49.351.8822.7.776
Fax
+49.351.8822.8.7776
Phone 855-ASK-ZMDI
(855-275-9634)
Phone +81.3.6895.7410
Fax
+81.3.6895.7301
Phone +886.2.2377.8189
Fax
+886.2.2377.8199
Phone +82.31.950.7679
Fax
+82.504.841.3026
DISCLAIMER: This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Zentrum Mikroelektronik Dresden AG
(ZMD AG) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. The information furnished hereby is believed to be true and accurate. However, under
no circumstances shall ZMD AG be liable to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever
arising out of or in any way related to the furnishing, performance, or use of this technical data. ZMD AG hereby expressly disclaims any liability of ZMD AG to any customer, licensee or
any other third party, and any such customer, licensee and any other third party hereby waives any liability of ZMD AG for any damages in connection with or arising out of the furnishing,
performance or use of this technical data, whether based on contract, warranty, tort (including negligence), strict liability, or otherwise.
© 2012 Zentrum Mikroelektronik Dresden AG — Rev.1.10— October 10, 2012
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
Contents
1
2
3
4
5
6
7
8
9
ZSPM4013 Characteristics.................................................................................................................................. 6
1.1. Absolute Maximum Ratings .......................................................................................................................... 6
1.2. Thermal Characteristics ................................................................................................................................ 6
1.3. Recommended Operating Conditions .......................................................................................................... 7
1.4. Electrical Characteristics .............................................................................................................................. 7
1.5. Regulator Characteristics ............................................................................................................................. 8
Typical Performance Characteristics ................................................................................................................ 10
Description of Circuit ......................................................................................................................................... 13
3.1. Internal Protection Details .......................................................................................................................... 14
3.1.1. Internal Current Limit ........................................................................................................................... 14
3.1.2. Thermal Shutdown ............................................................................................................................... 14
3.1.3. Reference Soft-Start ............................................................................................................................ 14
3.1.4. Output Over-Voltage ............................................................................................................................ 14
3.1.5. VCC Under-Voltage Lockout ................................................................................................................ 14
Application Circuits ............................................................................................................................................ 15
4.1. Selection of External Components ............................................................................................................. 15
4.2. Typical Application Circuits ......................................................................................................................... 15
Pin Configuration and Package ......................................................................................................................... 16
5.1. Marking Diagram & Pin-out ........................................................................................................................ 17
5.2. Pin Description for 16 LEAD 3x3mm QFN ................................................................................................. 18
5.3. Detailed Pin Description ............................................................................................................................. 19
5.3.1. Unregulated Input, VCC (Pins # 2, 3) .................................................................................................. 19
5.3.2. Bootstrap Control, BST (Pin #10) ........................................................................................................ 19
5.3.3. Sense Feedback, FB (Pin #5) .............................................................................................................. 19
5.3.4. Switching Output, VSW (Pins #12, 13) ................................................................................................ 19
5.3.5. Ground, GND (Pin #4) ......................................................................................................................... 19
5.3.6. Power Ground, PGND (Pins #14, 15) .................................................................................................. 19
5.3.7. Enable, High-Voltage, EN (Pin #9) ...................................................................................................... 19
5.3.8. Power Good Output, PG (Pin #8) ........................................................................................................ 19
Ordering Information ......................................................................................................................................... 20
Related Documents ........................................................................................................................................... 20
Glossary ............................................................................................................................................................ 20
Document Revision History ............................................................................................................................... 21
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
4 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
List of Figures
Figure 2.1
Figure 2.2
Figure 2.3
Figure 2.4
Figure 2.5
Figure 2.6
Figure 2.7
Figure 2.8
Figure 2.9
Figure 2.10
Figure 2.11
Figure 2.12
Figure 2.13
Figure 2.14
Figure 2.15
Figure 2.16
Figure 2.17
Figure 2.18
Figure 3.1
Figure 3.2
Figure 4.1
Figure 4.2
Figure 5.1
Figure 5.2
Startup Response ................................................................................................................................ 10
100mA to 1A Load Step (Vcc= 12V, Vout =1.8V) ................................................................................ 10
100mA to 2A Load (Vcc=12V, Vout = 1.8V) ........................................................................................ 10
100mA to 1A Load Step (Vcc=12V, Vout = 3.3V) ................................................................................ 10
100mA to 2A Load Step (Vcc=12V, Vout = 3.3V)................................................................................ 10
Line Transient Response (VCC=12V, Vout = 3.3V) ........................................................................... 10
Load Regulation ................................................................................................................................... 11
Line Regulation (IOUT=1A) .................................................................................................................... 11
Efficiency vs. Output Current ( VOUT = 1.8V) ........................................................................................ 11
Efficiency vs. Output Current ( VOUT = 3.3V) ........................................................................................ 11
Efficiency vs. Output Current ( VOUT = 5V) ........................................................................................... 11
Efficiency vs. Input Voltage (VOUT = 3.3V)............................................................................................ 11
Standby Current vs. Input Voltage ....................................................................................................... 12
Standby Current vs. Temperature ....................................................................................................... 12
Output Voltage vs. Temperature.......................................................................................................... 12
Oscillator Frequency vs. Temperature (Iout=300mA) ......................................................................... 12
Quiescent Current vs. Temperature (No load) ................................................................................... 12
Input Current vs. Temperature (No load, No switching) ..................................................................... 12
ZSPM4013 Block Diagram .................................................................................................................. 13
Monitor and Control Logic Functionality .............................................................................................. 14
Typical Application for Adjustable Output Voltage............................................................................... 15
Typical Application for Fixed Output Voltage ....................................................................................... 15
ZSPM4013 Package Drawing.............................................................................................................. 16
16 Lead 3x3mm QFN (top view) .......................................................................................................... 17
List of Tables
Table 1.1
Table 1.2
Table 1.3
Table 1.4
Table 5.1
Data Sheet
October 10, 2012
Absolute Maximum Ratings ................................................................................................................... 6
Thermal Characteristics ......................................................................................................................... 6
Recommended Operating Conditions ................................................................................................... 7
Electrical Characteristics ....................................................................................................................... 7
Pin Description, 16 lead, 3x3mm QFN ................................................................................................ 18
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
5 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
1
ZSPM4013 Characteristics
Important: Stresses beyond those listed under “Absolute Maximum Ratings” (section 1.1) 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 “Recommended Operating Conditions” (section 1.3) is not implied.
Exposure to absolute–maximum–rated conditions for extended periods may affect device reliability.
1.1.
Absolute Maximum Ratings
Over operating free–air temperature range unless otherwise noted.
Table 1.1
Absolute Maximum Ratings
Parameter
Value
1)
UNIT
Voltage on VCC pin
-0.3 to 20
V
Voltage on BST pin
-0.3 to (VCC+6)
V
Voltage on VSW pin
-1 to 20
V
-0.3 to 6
V
+/-2k
V
+/-500
V
260
C
Voltage on EN, PG, FB pins
Electrostatic Discharge – Human Body Model
2)
Electrostatic Discharge – Charge Device Model
2)
Lead Temperature (soldering, 10 seconds)
1)
2)
All voltage values are with respect to network ground terminal.
ESD testing is performed according to the respective JESD22 JEDEC standard.
1.2.
Thermal Characteristics
Table 1.2
Thermal Characteristics
Parameter
Symbol
Value
Unit
JA
38
°C/W
Storage Temperature Range
TSTG
-65 to 150
°C
Maximum Junction Temperature
TJ MAX
150
°C
TJ
-40 to 125
°C
Thermal Resistance Junction to Air
1)
Operating Junction Temperature Range
1)
Assumes 1 in2 area of 2 oz. copper and 25C ambient temperature.
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
6 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
1.3.
Recommended Operating Conditions
Table 1.3
Recommended Operating Conditions
Parameter
Input Operating Voltage
Bootstrap Capacitor
Output Filter Inductor Typical Value
1)
Output Filter Capacitor Typical Value
2)
Output Filter Capacitor ESR
Input Supply Bypass Capacitor Typical Value
1)
2)
3)
1.4.
3)
Symbol
Min
Typ
Max
Unit
VCC
6
12
18
V
CBST
17.6
22
26.4
nF
LOUT
3.76
4.7
5.64
µH
COUT
33
44 (2 x 22)
COUT-ESR
2
35
CBYPASS
8
10
µF
100
m
µF
For best performance, an inductor with a saturation current rating higher than the maximum V OUT load requirement plus the inductor
current ripple.
For best performance, a low ESR ceramic capacitor should be used.
For best performance, a low ESR ceramic capacitor should be used. If CBYPASS is not a low ESR ceramic capacitor, a 0.1µF ceramic
capacitor should be added in parallel to CBYPASS.
Electrical Characteristics
Electrical Characteristics, TJ = -40°C to 125°C, VCC = 12V (unless otherwise noted)
Table 1.4
Electrical Characteristics
Parameter
Symbol
Condition
Min
Typ
Max
Unit
18
V
VCC Supply Voltage
Input Supply Voltage
Quiescent Current:
Normal Mode
Quiescent Current:
Normal Mode, Non-switching
Quiescent Current:
Disabled Mode
VCC
ICC-NORM
ICCNOSWITCH
ICC-DISABLE
6
VCC = 12V, ILOAD = 0A, EN  2.2V
5.2
mA
VCC=12V, ILOAD=0A, EN  2.2V
Non-switching
2.3
mA
VCC = 12V, EN = 0V
5
10
µA
5.75
6.0
V
VCC Under Voltage Lockout
Input Supply Under Voltage
Threshold
Input Supply Under Voltage
Threshold Hysteresis
VCC-UV
VCC Increasing
5.5
VCC-
650
mV
UV_HYST
Oscillator
Oscillator Frequency
Data Sheet
October 10, 2012
fOSC
0.9
1
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
1.1
MHz
7 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
Parameter
Symbol
Condition
Min
Typ
Max
Unit
PG Open Drain Output
PG Release Timer
TPG
High-Level Output Leakage
IOH-PG
VPG = 5V
Low-Level Output Voltage
VOL-PG
IPG = -0.3mA
10
ms
0.5
µA
0.01
V
EN Input Voltage Thresholds
High Level Input Voltage
VIH-EN
Low Level Input Voltage
VIL-EN
Input Hysteresis
2.2
0.8
VHYST-EN
Input Leakage
IIN-EN
V
V
480
mV
VEN=5V
3.5
µA
VEN=0V
-1.5
µA
170
°C
10
°C
Thermal Shutdown
Thermal Shutdown Junction
Temperature
TSD Hysteresis
1.5.
TSD
Note: Guaranteed by design
150
TSDHYST
Regulator Characteristics
Electrical Characteristics, TJ = -40°C to 125°C, VCC = 12V (unless otherwise noted)
Parameter
Symbol
Condition
Min
Typ
Max
Unit
ILOAD =1A
VOUT –
2%
VOUT
VOUT +
2%
V
ILOAD = 0A
VOUT –
1%
VOUT +
1%
VOUT +
3.5%
V
Switch Mode Regulator: LOUT=4.7µH and COUT=2 x 22µF
Output Voltage Tolerance in
PWM Mode
VOUT-
Output Voltage Tolerance in
PFM Mode
VOUT-
PWM
PFM
High Side Switch On
Resistance
Low Side Switch On
Resistance
RDSON
Output Current
IOUT
Over Current Detect
IOCD
Feedback Reference
(Adjustable Mode)
FBTH
Feedback Reference
Tolerance
FBTH-TOL
Data Sheet
October 10, 2012
IVSW = -1A
(See table note 1)
180
mΩ
IVSW = 1A
(See table note 1)
120
mΩ
HS switch current
3
A
3.4
3.8
4.4
A
0.886
0.9
0.914
V
1.5
%
-1.5
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
8 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
Parameter
Soft Start Ramp Time
Symbol
Condition
Min
Typ
Max
Unit
TSS
4
ms
PFM Mode FB Comparator
Threshold
FBTH-PFM
VOUT +
1%
V
VOUT Under Voltage
Threshold
VOUT-UV
VOUT Under Voltage
Hysteresis
VOUT Over Voltage Threshold
VOUT Over Voltage
Hysteresis
Max Duty Cycle
1)
2)
91%
VOUT
VOUT-
95%
VOUT
1.5%
VOUT
UV_HYST
VOUT-OV
103%
VOUT
VOUT-
1% VOUT
OV_HYST
DUTYMAX
93%
VOUT
(See table note 2)
95%
97%
99%
RDSON is characterized at 1A and tested at lower current in production.
Regulator VSW pin is forced off for 240ns every 8 cycles to ensure the BST cap is replenished.
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
9 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
2
Typical Performance Characteristics
Figure 2.1 Startup Response
Figure 2.2 100mA to 1A Load Step (Vcc= 12V, Vout =1.8V)
Figure 2.3 100mA to 2A Load (Vcc=12V, Vout = 1.8V)
Figure 2.4 100mA to 1A Load Step (Vcc=12V, Vout = 3.3V)
Figure 2.5 100mA to 2A Load Step
(Vcc=12V, Vout = 3.3V)
Figure 2.6 Line Transient Response
(VCC=12V, Vout = 3.3V)
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
10 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
Figure 2.7 Load Regulation
Figure 2.8 Line Regulation (IOUT=1A)
Figure 2.9 Efficiency vs. Output Current ( VOUT = 1.8V)
Figure 2.10 Efficiency vs. Output Current ( VOUT = 3.3V)
Figure 2.11 Efficiency vs. Output Current ( VOUT = 5V)
Figure 2.12 Efficiency vs. Input Voltage (VOUT = 3.3V)
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
11 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
Figure 2.13 Standby Current vs. Input Voltage
Figure 2.14 Standby Current vs. Temperature
Figure 2.15 Output Voltage vs. Temperature
Figure 2.16 Oscillator Frequency vs. Temperature
(Iout=300mA)
Figure 2.17 Quiescent Current vs. Temperature (No load)
Figure 2.18 Input Current vs. Temperature
(No load, No switching)
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
12 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
3
Description of Circuit
The ZSPM4013 current-mode synchronous step-down power supply product can be used in the commercial,
industrial, and automotive market segments. It includes flexibility for a wide range of output voltages and is
optimized for high efficiency power conversion with low RDSON integrated synchronous switches. A 1MHz internal
switching frequency facilitates low-cost LC filter combinations. Additionally, the fixed-output versions enable a
minimum external component count to provide a complete regulation solution with only 4 external components: an
input bypass capacitor, an inductor, an output capacitor, and the bootstrap capacitor. The regulator automatically
transitions between PFM and PWM mode to maximize efficiency for the load demand.
Figure 3.1
ZSPM4013 Block Diagram
PG
EN
VCC
4.2V
VCC
VCC
MONITOR
&
CONTROL
Oscillator
VCC
Over-Voltage
Protection
FB
Bootstrap
Voltage
Thermal
Protection
Ramp
Generator
Vref
&
Soft Start
Under-Voltage
Protection
BST
Over Current
Protection
VCC

CBST
Gate
Drive
Gate Drive
Control
VSW
LOUT
VOUT
COUT
Comparator
Gate
Drive
Error Amp
Compensation
Network
PGND
Vref
RTOP
FB
PFM Mode
Comparator
RBOT
GND
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
13 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
Figure 3.2
Monitor and Control Logic Functionality
PG
VOUT-UV
EN
Filter
Filter
ENABLE
REGULATOR
Internal
POR
Filter
VCC-UV
Filter
TSD
3.1.
3.1.1.
Filter
VOUT-OV
Filter
IOCD
OCD_Filter
TRI-STATE
VSW OUTPUT
Internal Protection Details
Internal Current Limit
The current through the high side FET is sensed on a cycle-by-cycle basis, and if the current limit is reached, it
will abbreviate the cycle. In addition, the device senses the FB pin to identify hard short conditions and will direct
the VSW output to skip 4 cycles if the current limit occurs when FB is low. This allows current built up in the
inductor during the minimum on time to decay sufficiently. The current limit is always active when the regulator is
enabled. Soft start ensures that current limit does not prevent regulator startup.
An additional feature of the over-current protection circuitry is that under extended over-current conditions, the
device will automatically disable. A simple toggle of the EN enable pin will return the device to normal operation.
3.1.2.
Thermal Shutdown
If the temperature of the die exceeds 170°C (typical), the VSW outputs will tri-state to protect the device from
damage. The PG and all other protection circuitry will stay active to inform the system of the failure mode. Once
the ZSPM4013 cools to 160°C (typical), the device will attempt to start up again, following the normal soft start
sequence. If the device reaches 170°C, the shutdown/restart sequence will repeat.
3.1.3.
Reference Soft-Start
The reference in this device is ramped at a rate of 4ms to prevent the output from overshoot during startup. This
ramp restarts whenever there is a rising edge sensed on the EN pin. This occurs in both the fixed and adjustable
versions. During the soft start ramp, current limit is still active and still protects the device if the output is shorted.
3.1.4.
Output Over-Voltage
If the output of the regulator exceeds 103% of the regulation voltage, the VSW outputs will tri-state to protect the
ZSPM4013 from damage. This check occurs at the start of each switching cycle. If it occurs during the middle of a
cycle, the switching for that cycle will complete and the VSW outputs will tri-state at the start of the next cycle.
3.1.5.
VCC Under-Voltage Lockout
The ZSPM4013 is held in the off state until VCC reaches 5.75V (typical). There is hysteresis on this input (see
section 1.4).
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
14 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
4
4.1.
Application Circuits
Selection of External Components
The internal compensation is optimized for a 44µF output capacitor and a 4.7µH inductor. The minimum allowable
value for the output capacitor is 33µF. To keep the output ripple low, a low ESR (less than 35mΩ) ceramic is
recommended. The inductor range is 4.7µH +/-20%. For optimal over-current protection, the inductor should be
able to handle up to the regulator current limit without saturation.
Connect the VCC pin to the bypass capacitor CBYPASS to improve performance (see section 5.3.1). See Table 1.3
for the recommended value.
Connect the BST pin to the bootstrap capacitor CBST as described in section 5.3.2. See Table 1.3 for the
recommended value.
4.2.
Typical Application Circuits
Figure 4.1
Typical Application for Adjustable Output Voltage
Adjustable Output
BST
VCC
VCC
VSW
GND
EN
Figure 4.2
PGND
ZSPM4013
CBYPASS
EN
CBST
VOUT
LOUT
RTOP
COUT
RBOT
FB
VOUT
10 kΩ
(optional)
PG
PG
Typical Application for Fixed Output Voltage
Fixed Output
VCC
BST
VCC
Data Sheet
October 10, 2012
PGND
EN
GND
EN
ZSPM4013
CBYPASS
VSW
CBST
VOUT
LOUT
COUT
FB
VOUT
10kΩ
(optional)
PG
PG
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
15 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
5
Pin Configuration and Package
Figure 5.1
ZSPM4013 Package Drawing
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
16 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
5.1.
Marking Diagram & Pin-out
Figure 5.2
16 Lead 3x3mm QFN (top view)
4013: Part Name
A: Revision
XXXXX: Lot number (last five digits)
O: Pin 1 mark
VL: Voltage level
 15 1.5V
 18 1.8V
 25 2.5V
 33 3.3V
 50 5.0V
 00 0.9V – 5.0V variable
MY: Date Code
M = Month
 1 January
 2 February
 3 March
 4 April
 5 May
 6 June
 7 July
 8 August
 9 September
 A October
 B November
 C December
Y = Year
 A 2011
 B 2012
 C 2013
 Etc.
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
17 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
5.2.
Pin Description for 16 LEAD 3x3mm QFN
Table 5.1
Pin Description, 16 lead, 3x3mm QFN
Name
Pin #
VSW
1
Switching Voltage Node
Connected to a 4.7µH (typical) inductor. Also connect to
additional VSW pins 12, 13, and 16.
VCC
2
Input Voltage
Input voltage. Also connect to additional VCC pins 3 and 11.
VCC
3
Input Voltage
Input voltage. Also connect to additional VCC pins 2 and 11.
GND
4
GND
Primary ground for the majority of the device except the lowside power FET.
FB
5
Feedback Input
Regulator FB voltage. Connects to VOUT for fixed-mode and
the output resistor divider for adjustable mode.
NC
6
No Connect
Not connected.
NC
7
No Connect
Not connected.
PG
8
PG Output
Open-drain output.
EN
9
Enable Input
Above 2.2V the device is enabled. Ground this pin to disable
the ZSPM4013. Includes internal pull-up.
BST
10
Bootstrap Capacitor
Bootstrap capacitor for the high-side FET gate driver.
Connect a 22nF ceramic capacitor from BST pin to VSW pin.
VCC
11
Input Voltage
Input voltage. Also connect to additional VCC pins 2 and 3.
VSW
12
Switching Voltage Node
Connected to 4.7µH (typical) inductor. Also connect to
additional VSW pins 1, 13, and 16.
VSW
13
Switching Voltage Node
Connected to 4.7µH (typical) inductor. Also connect to
additional VSW pins 1, 12, and 16.
PGND
14
Power GND
GND supply for internal low-side FET/integrated diode. Also
connect to additional PGND pin 15.
PGND
15
Power GND
GND supply for internal low-side FET/integrated diode. Also
connect to additional PGND pin 14.
VSW
16
Switching Voltage Node
Connected to 4.7µH (typical) inductor. Also connect to
additional VSW pins 1, 12, and 13.
Data Sheet
October 10, 2012
Function
Description
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
18 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
5.3.
5.3.1.
Detailed Pin Description
Unregulated Input, VCC (Pins # 2, 3)
This terminal is the unregulated input voltage source for the ZSPM4013. It is recommended that a 10µF bypass
capacitor be placed close to the device for best performance. Since this is the main supply for the ZSPM4013, good
layout practices must be followed for this connection.
5.3.2.
Bootstrap Control, BST (Pin #10)
This terminal will provide the bootstrap voltage required for the upper internal NMOS switch of the buck regulator. An
external ceramic capacitor placed between the BST input terminal, and the VSW pin will provide the necessary
voltage for the upper switch. In normal operation, the capacitor is re-charged on every low side synchronous
switching action. If the switch mode approaches 100% duty cycle for the high side FET, the device will automatically
th
reduce the duty cycle switch to a minimum off time on every 8 cycle to allow this capacitor to re-charge.
5.3.3.
Sense Feedback, FB (Pin #5)
This is the input terminal for the output voltage feedback. For the fixed-mode versions, this should be connected
directly to VOUT. The connection on the PCB should be kept as short as possible and should be made as close as
possible to the capacitor. The trace should not be shared with any other connection. For adjustable-mode versions of
the ZSPM4013, this should be connected to the external resistor divider. To choose the resistors, use the following
equation:
VOUT = 0.9 (1 + RTOP/RBOT)
The input to the FB pin is high impedance, and input current should be less than 100nA. As a result, good layout
practices are required for the feedback resistors and feedback traces. When using the adjustable version, the
feedback trace should be kept as short and narrow as possible to reduce stray capacitance and the injection of noise.
5.3.4.
Switching Output, VSW (Pins #12, 13)
This is the switching node of the regulator. It should be connected directly to the 4.7µH inductor with a wide, short
trace and to one end of the bootstrap capacitor. It is switching between VCC and PGND at the switching frequency.
5.3.5.
Ground, GND (Pin #4)
This ground is used for the majority of the device including the analog reference, control loop, and other circuits.
5.3.6.
Power Ground, PGND (Pins #14, 15)
This is a separate ground connection used for the low-side synchronous switch to isolate switching noise from the
rest of the device.
5.3.7.
Enable, High-Voltage, EN (Pin #9)
This is the input terminal to activate the regulator. The input threshold is TTL/CMOS compatible. It also has an
internal pull-up to ensure a stable state if the pin is disconnected.
5.3.8.
Power Good Output, PG (Pin #8)
This is an open drain, active low output. The switched mode output voltage is monitored, and the PG line will remain
low until the output voltage reaches the VOUT-UV threshold. Once the internal comparator detects that the output
voltage is above the desired threshold, an internal delay timer is activated and the PG line is de-asserted (to high)
once this delay timer expires. In the event that the output voltage decreases below VOUT-UV, the PG line will be
asserted low and remain low until the output rises above VOUT-UV and the delay timer times out. (See Figure 3.2.)
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
19 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
6
7
Ordering Information
Ordering Code
Description
Package
ZSPM4013AA1W00
ZSPM4013, 3A Synchronous Buck Converter: adjustable output, 0.9V to 5V,
16-pin 3x3mm QFN
7” reel with 1000 ICs
ZSPM4013AA1W15
ZSPM4013, 3A Synchronous Buck Converter: fixed output, 1.5V,16-pin 3x3mm QFN
7” reel with 1000 ICs
ZSPM4013AA1W18
ZSPM4013, 3A Synchronous Buck Converter: fixed output, 1.8V,16-pin 3x3mm QFN
7” reel with 1000 ICs
ZSPM4013AA1W25
ZSPM4013, 3A Synchronous Buck Converter: fixed output, 2.5V,16-pin 3x3mm QFN
7” reel with 1000 ICs
ZSPM4013AA1W33
ZSPM4013, 3A Synchronous Buck Converter: fixed output, 3.3V,16-pin 3x3mm QFN
7” reel with 1000 ICs
ZSPM4013AA1W50
ZSPM4013, 3A Synchronous Buck Converter: fixed output, 5.0V,16-pin 3x3mm QFN
7” reel with 1000 ICs
ZSPM4013KIT
ZSPM4013KIT, Evaluation Kit for 3A Synchronous Buck Converter
Kit
Related Documents
Document
File Name
ZSPM4013 Feature Sheet
ZSPM4013_Feature_Sheet_rev_X_xy.pdf
ZSPM4013 Evaluation Kit Description
ZSPM4013_12_13_Eval_Kit_Manual__X_xy.pdf
Note: X_xy denotes the current revision of the document. Visit ZMDI’s website www.zmdi.com or contact your nearest sales
office for the latest version of these documents.
8
Glossary
Term
Description
Buck converter
Step-down converter; converts a higher DC input voltage to a lower DC output voltage with high efficiency.
Synchronous
Rectification
A technique for improving the efficiency of rectification by replacing diodes with actively controlled
switches, such as transistors.
PWM
Pulse width modulation (fixed frequency).
PFM
Pulse frequency modulation (fixed pulse width).
ESR
Equivalent series resistance.
Bootstrap
Control
When using an N-Channel Power MOSFET transistor as a high-side switch for the converter switching
output, a gate voltage higher than the supply voltage is needed to turn the transistor fully on.
For this purpose, a charge pump circuit, called the bootstrap control, is implemented to provide this high
supply voltage for the high-side power MOSFET driver block.
Data Sheet
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
October 10, 2012
20 of 21
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
9
Document Revision History
Revision
Date
Description
1.00
23-Jan-2012
First release.
1.01
26-Jan-2012
Revision to delete note under Table 1.2.
1.02
17-Sep-2012
Correction of application circuits. PG can only be connected to VOUT through the optional
resistor.
1.10
10-Oct-2012
Correction of specifications for operating voltage supply range in Table 1.3, in Table 1.4,
and on page 2.
Removed reference to “Dissipation Table” in Table 1.1.
Update for Figure 2.6.
Added instructions to connect duplicate pins in the pin description table.
Revised block diagram graphic for block titled “Under and Over Voltage Protection” to read
“Over-Voltage Protection.”
Removed reference to the R code in the part-ordering table in section 6. This option is not
available.
Revised reference to “Figure 2” in section 5.3.8 to refer to Figure 3.2.
Update for contact information.
Sales and Further Information
www.zmdi.com
[email protected]
Zentrum Mikroelektronik
Dresden AG
Grenzstrasse 28
01109 Dresden
Germany
ZMD America, Inc.
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Milpitas, CA 95035-7453
USA
Zentrum Mikroelektronik
Dresden AG, Japan Office
2nd Floor, Shinbashi Tokyu Bldg.
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
ZMD FAR EAST, Ltd.
3F, No. 51, Sec. 2,
Keelung Road
11052 Taipei
Taiwan
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Dresden AG, Korea Office
U-space 1 Building
11th Floor, Unit JA-1102
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Phone +49.351.8822.7.776
Fax
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Fax
+886.2.2377.8199
Phone +82.31.950.7679
Fax
+82.504.841.3026
DISCLAIMER: This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Zentrum Mikroelektronik Dresden AG
(ZMD AG) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. The information furnished hereby is believed to be true and accurate. However, under
no circumstances shall ZMD AG be liable to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever
arising out of or in any way related to the furnishing, performance, or use of this technical data. ZMD AG hereby expressly disclaims any liability of ZMD AG to any customer, licensee or
any other third party, and any such customer, licensee and any other third party hereby waives any liability of ZMD AG for any damages in connection with or arising out of the furnishing,
performance or use of this technical data, whether based on contract, warranty, tort (including negligence), strict liability, or otherwise.
Data Sheet
October 10, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
21 of 21