Data Sheet
Rev. 1.10 / June 2013
ZSPM4012B
High Efficiency 2A Synchronous Buck Converter
Analog Power ICs
Powerful
and Determined
ZSPM4012B
High Efficiency 2A Synchronous Buck Converter
Brief Description
The ZSPM4012B 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 ZSPM4012B utilizes current mode feedback in
normal regulation pulse-width modulation (PWM)
mode. When the regulator is disabled (EN pin is
low), the ZSPM4012B draws less than 10µA quies-
cent current.
The ZSPM4012B integrates a wide range of
protection circuitry, including input supply under-
voltage lockout, output voltage soft start, current
limit, V
OUT
over-voltage, and thermal shutdown.
The ZSPM4012B includes supervisory reporting
through the PG (Power Good) open drain output to
interface other components in the system.
Benefits
Increased battery life
Minimal external component count
(3 capacitors, 1 inductor)
Inherent fault protection and reporting
Available Support
Evaluation Kit
Documentation
Physical Characteristics
Junction operating temperature -40°C to 125°C
Packaged in a 16pin QFN (3x3mm)
Related ZMDI Products
Features
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
5.5V with +/- 1.5% reference
Wide input voltage range: 4.5V to 24V
1MHz +/- 10% fixed switching frequency
2A continuous output current
High efficiency – up to 95%
Current mode PWM control with pulse-
frequency modulation (PFM) mode for
improved light load efficiency
Voltage supervisor for V
OUT
reported at the PG
pin
Input supply under voltage lockout
Soft start for controlled startup with no
overshoot
Full protection for over-current, over-
temperature, and V
OUT
over-voltage
Less than 10µA in Disabled Mode
Low external component count
ZSPM4011B/ZSPM4013B: 1A/3A synchronous
buck converters, available with adjustable out-
put from 0.9 to 5.5V 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-pin 4x4mm QFN)
ZSPM4012B Application Circuits
Adjustable Output
BST
VCC
C
BYPASS
VCC
VSW
C
BST
VOUT
L
OUT
R
TOP
R
BOT
FB
VOUT
10 kΩ
(optional)
ZSPM4012B
C
OUT
EN
EN
PGND
GND
PG
PG
Fixed Output
VCC
C
BYPASS
BST
VCC
VSW
C
BST
VOUT
L
OUT
C
OUT
ZSPM4012B
FB
VOUT
EN
EN
10kΩ
(optional)
PG
PGND
GND
PG
For more information, contact ZMDI via
Analog@zmdi.com.
© 2013 Zentrum Mikroelektronik Dresden AG — Rev.1.10 — June 21, 2013.
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.
ZSPM4012B
High Efficiency 2A Synchronous Buck Converter
ZSPM4012B Block Diagram
PG
EN
VCC
4.2V
VCC
VCC
MONITOR
&
CONTROL
Under-Voltage
Protection
VCC
Over-Voltage
Protection
Thermal
Protection
Over Current
Protection
FB
Oscillator
Ramp
Generator
Bootstrap
Voltage
BST
VCC
Typical Applications
Vref
&
Soft Start
Gate
Drive
Gate Drive
Control
High-Side Switch
Wireless access points, cable
modems
Set-top boxes
DVD, LCD, LED supplies
Portable products, including
GPS, smart phones, tablet
PCs
Printers
VSW
Comparator
Error Amp
Compensation
Network
Vref
Gate
Drive
Low-Side Switch
PGND
PFM Mode
Comparator
FB
GND
Ordering Information
Ordering Code
ZSPM4012BA1W00
ZSPM4012BA1W15
ZSPM4012BA1W18
ZSPM4012BA1W25
ZSPM4012BA1W33
ZSPM4012BA1W50
ZSPM4012BKIT
Description
2A Synchronous Buck Converter: adjustable output, 0.9V to 5.5V, 16-pin 3x3mm QFN
2A Synchronous Buck Converter: fixed output, 1.5V,16-pin 3x3mm QFN
2A Synchronous Buck Converter: fixed output, 1.8V,16-pin 3x3mm QFN
2A Synchronous Buck Converter: fixed output, 2.5V,16-pin 3x3mm QFN
2A Synchronous Buck Converter: fixed output, 3.3V,16-pin 3x3mm QFN
2A Synchronous Buck Converter: fixed output, 5.0V,16-pin 3x3mm QFN
ZSPM4012B Evaluation Kit for 2A Synchronous Buck Converter
Package
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
7” reel with 1000 ICs
Kit
Sales and Further Information
Zentrum Mikroelektronik
Dresden AG
Global Headquarters
Grenzstrasse 28
01109 Dresden, Germany
Central Office:
Phone +49.351.8822.0
Fax
+49.351.8822.600
ZMD America, Inc.
1525 McCarthy Blvd., #212
Milpitas, CA 95035-7453
USA
USA Phone +855.275.9634
Phone +408.883.6310
Fax
+408.883.6358
www.zmdi.com
Zentrum Mikroelektronik
Dresden AG, Japan Office
2nd Floor, Shinbashi Tokyu Bldg.
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
Phone +81.3.6895.7410
Fax
+81.3.6895.7301
ZMD FAR EAST, Ltd.
3F, No. 51, Sec. 2,
Keelung Road
11052 Taipei
Taiwan
Analog@zmdi.com
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 +82.31.950.7679
Fax
+82.504.841.3026
Phone +886.2.2377.8189
Fax
+886.2.2377.8199
European Technical Support
Phone +49.351.8822.7.772
Fax
+49.351.8822.87.772
European Sales
(Stuttgart)
Phone +49.711.674517.55
Fax
+49.711.674517.87955
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.
© 2013 Zentrum Mikroelektronik Dresden AG — Rev.1.10— June 21, 2013
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyri ght owner.
ZSPM4012B
High Efficiency 2A Synchronous Buck Converter
Contents
1
ZSPM4012B 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 – ZSPM401x Family ............................................................................... 10
Description of Circuit ......................................................................................................................................... 13
3.1. Block Diagram ............................................................................................................................................ 13
3.2. Internal Protection Details .......................................................................................................................... 14
3.2.1. Internal Current Limit ........................................................................................................................... 14
3.2.2. Thermal Shutdown ............................................................................................................................... 14
3.2.3. Voltage Reference Soft-Start ............................................................................................................... 14
3.2.4. VCC Under-Voltage Lockout ................................................................................................................ 14
3.2.5. Output Over-Voltage Protection ........................................................................................................... 15
3.2.6. Output Under-Voltage Monitoring ........................................................................................................ 15
Application Circuits ............................................................................................................................................ 16
4.1. Selection of External Components ............................................................................................................. 16
4.2. Typical Application Circuits ......................................................................................................................... 16
Pin Configuration and Package ......................................................................................................................... 17
5.1. Marking Diagram & Pin-out ........................................................................................................................ 18
5.2. Pin Description for 16 LEAD 3x3mm QFN ................................................................................................. 19
5.3. Detailed Pin Description ............................................................................................................................. 20
5.3.1. Unregulated Input, VCC (Pins # 2, 3) .................................................................................................. 20
5.3.2. Bootstrap Control, BST (Pin #10) ........................................................................................................ 20
5.3.3. Sense Feedback, FB (Pin #5) .............................................................................................................. 20
5.3.4. Switching Output, VSW (Pins #12, 13) ................................................................................................ 20
5.3.5. Ground, GND (Pin #4) ......................................................................................................................... 20
5.3.6. Power Ground, PGND (Pins #14, 15) .................................................................................................. 20
5.3.7. Enable, EN (Pin #9) ............................................................................................................................. 20
5.3.8. PG Output, PG (Pin #8) ....................................................................................................................... 20
Ordering Information ......................................................................................................................................... 21
Related Documents ........................................................................................................................................... 21
Glossary ............................................................................................................................................................ 21
Document Revision History ............................................................................................................................... 22
2
3
4
5
6
7
8
9
Data Sheet
June 21, 2013
© 2013 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.
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ZSPM4012B
High Efficiency 2A 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=10V to 15V, VOUT = 3.3V) ............................................................. 10
Load Regulation ................................................................................................................................... 11
Line Regulation (I
OUT
=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
ZSPM4012B Block Diagram ................................................................................................................ 13
Monitor and Control Logic Functionality .............................................................................................. 14
Typical Application for Adjustable Output Voltage............................................................................... 16
Typical Application for Fixed Output Voltage ....................................................................................... 16
ZSPM4012B Package Drawing ........................................................................................................... 17
16 Lead 3x3mm QFN (top view) .......................................................................................................... 18
List of Tables
Table 1.1
Table 1.2
Table 1.3
Table 1.4
Table 1.5
Table 5.1
Absolute Maximum Ratings ................................................................................................................... 6
Thermal Characteristics ......................................................................................................................... 6
Recommended Operating Conditions ................................................................................................... 7
Electrical Characteristics ....................................................................................................................... 7
Regulator Characteristics ...................................................................................................................... 8
Pin Description, 16 lead, 3x3mm QFN ................................................................................................ 19
Data Sheet
June 21, 2013
© 2013 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.
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