Features

ZSPM4012B
High Efficiency 2A Synchronous Buck Converter
Brief Description
Benefits
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.
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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 quiescent current.
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Junction operating temperature -40°C to 125°C
Packaged in a 16pin QFN (3x3mm)
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Related ZMDI Products
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ZSPM4011B/ZSPM4013B: 1A/3A synchronous
buck converters, available with adjustable output 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)
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ZSPM4012B Application Circuits
Adjustable Output
BST
VCC
VCC
CBYPASS
EN
CBST
VSW
EN
VOUT
LOUT
RTOP
COUT
RBOT
FB
VOUT
10 kΩ
(optional)
PG
PG
Fixed Output
VCC
BST
VCC
CBYPASS
EN
EN
GND
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Physical Characteristics
ZSPM4012B
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Evaluation Kit
Documentation
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PGND
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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 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
GND
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ZSPM4012B
Features
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PGND
The ZSPM4012B 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 ZSPM4012B 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]
© 2014 Zentrum Mikroelektronik Dresden AG — Rev.1.20 — February 18, 2014. 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
Oscillator
Typical Applications
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Wireless access points, cable
modems
Set-top boxes
DVD, LCD, LED supplies
Portable products, including
GPS, smart phones, tablet
PCs
Printers
VCC
Over-Voltage
Protection
FB
Bootstrap
Voltage
Thermal
Protection
Ramp
Generator
Vref
&
Soft Start
Under-Voltage
Protection
BST
Over Current
Protection
VCC

Gate
Drive
Gate Drive
Control
Comparator
Gate
Drive
Error Amp
Compensation
Network
VSW
High-Side Switch
Vref
PGND
Low-Side Switch
FB
PFM Mode
Comparator
GND
Ordering Information
Ordering Code
Description
ZSPM4012BA1W00
ZSPM4012BA1W15
ZSPM4012BA1W18
ZSPM4012BA1W25
ZSPM4012BA1W33
ZSPM4012BA1W50
ZSPM4012BKIT
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
Sales and Further Information
Package
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
7” reel with 1000 ICs
Kit
[email protected]
Zentrum Mikroelektronik
Dresden AG
Global Headquarters
Grenzstrasse 28
01109 Dresden, Germany
ZMD America, Inc.
1525 McCarthy Blvd., #212
Milpitas, CA 95035-7453
USA
Central Office:
Phone +49.351.8822.306
Fax
+49.351.8822.337
USA Phone 1.855.275.9634
Phone +1.408.883.6310
Fax
+1.408.883.6358
European Technical Support
Phone +49.351.8822.7.772
Fax
+49.351.8822.87.772
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.
European Sales (Stuttgart)
Phone +49.711.674517.55
Fax
+49.711.674517.87955
Zentrum Mikroelektronik
Dresden AG, Japan Office
2nd Floor, Shinbashi Tokyu Bldg.
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Tokyo, 105-0004
Japan
ZMD FAR EAST, Ltd.
3F, No. 51, Sec. 2,
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11052 Taipei
Taiwan
Phone +81.3.6895.7410
Fax
+81.3.6895.7301
Phone +886.2.2377.8189
Fax
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Dresden AG, Korea Office
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Phone +82.31.950.7679
Fax
+82.504.841.3026
© 2014 Zentrum Mikroelektronik Dresden AG — Rev.1.20 — February 18, 2014
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.