High Efficiency 2A Synchronous
Buck Converter
ZSPM4012B
Datasheet
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 IDT 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
© 2016 Integrated Device Technology, Inc.
1
January 27, 2016
High Efficiency 2A Synchronous
Buck Converter
ZSPM4012B
Datasheet
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
S
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
Corporate Headquarters
6024 Silver Creek Valley Road
San Jose, CA 95138
www.IDT.com
Sales
1-800-345-7015 or 408-284-8200
Fax: 408-284-2775
www.IDT.com/go/sales
Tech Support
www.IDT.com/go/support
DISCLAIMER Integrated Device Technology, Inc. (IDT) reserves the right to modify the products and/or specifications described herein at any time, without notice, at IDT's sole discretion. Performance
specifications and operating parameters of the described products are determined in an independent state and are not guaranteed to perform the same way when installed in customer products. The
information contained herein is provided without representation or warranty of any kind, whether express or implied, including, but not limited to, the suitability of IDT's products for any particular purpose, an
implied warranty of merchantability, or non-infringement of the intellectual property rights of others. This document is presented only as a guide and does not convey any license under intellectual property
rights of IDT or any third parties.
IDT's products are not intended for use in applications involving extreme environmental conditions or in life support systems or similar devices where the failure or malfunction of an IDT product can be
reasonably expected to significantly affect the health or safety of users. Anyone using an IDT product in such a manner does so at their own risk, absent an express, written agreement by IDT.
Integrated Device Technology, IDT and the IDT logo are trademarks or registered trademarks of IDT and its subsidiaries in the United States and other countries. Other trademarks used herein are the
property of IDT or their respective third party owners. For datasheet type definitions and a glossary of common terms, visit
www.idt.com/go/glossary.
All contents of this document are copyright of Integrated
Device Technology, Inc. All rights reserved.
© 2016 Integrated Device Technology, Inc.
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January 27, 2016
ZSPM4012B Datasheet
Contents
1
ZSPM4012B Characteristics ............................................................................................................................... 5
1.1. Absolute Maximum Ratings .......................................................................................................................... 5
1.2. Thermal Characteristics ................................................................................................................................ 5
1.3. Recommended Operating Conditions .......................................................................................................... 6
1.4. Electrical Characteristics .............................................................................................................................. 6
1.5. Regulator Characteristics ............................................................................................................................. 7
Typical Performance Characteristics – ZSPM401x Family ................................................................................. 9
Description of Circuit ......................................................................................................................................... 12
3.1. Block Diagram ............................................................................................................................................ 12
3.2. Internal Protection Details .......................................................................................................................... 13
3.2.1. Internal Current Limit ........................................................................................................................... 13
3.2.2. Thermal Shutdown ............................................................................................................................... 13
3.2.3. Voltage Reference Soft-Start ............................................................................................................... 13
3.2.4. VCC Under-Voltage Lockout................................................................................................................ 13
3.2.5. Output Over-Voltage Protection ........................................................................................................... 14
3.2.6. Output Under-Voltage Monitoring ........................................................................................................ 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, EN (Pin #9) ............................................................................................................................. 19
5.3.8. PG Output, PG (Pin #8) ....................................................................................................................... 19
Ordering Information ......................................................................................................................................... 20
Related Documents ........................................................................................................................................... 20
Glossary ............................................................................................................................................................ 20
Document Revision History ............................................................................................................................... 21
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9
© 2016 Integrated Device Technology, Inc.
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January 27, 2016
ZSPM4012B Datasheet
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 .................................................................................................................................. 9
100mA to 1A Load Step (VCC= 12V, VOUT =1.8V) ............................................................................. 9
100mA to 2A Load (VCC=12V, VOUT = 1.8V) ...................................................................................... 9
100mA to 1A Load Step (VCC=12V, VOUT = 3.3V) ............................................................................. 9
100mA to 2A Load Step (VCC=12V, VOUT = 3.3V) ............................................................................. 9
Line Transient Response (VCC=10V to 15V, VOUT = 3.3V) ............................................................... 9
Load Regulation ................................................................................................................................... 10
Line Regulation (I
OUT
=1A) .................................................................................................................... 10
Efficiency vs. Output Current ( VOUT = 1.8V) ..................................................................................... 10
Efficiency vs. Output Current (VOUT = 3.3V) ...................................................................................... 10
Efficiency vs. Output Current ( VOUT = 5V) ........................................................................................ 10
Efficiency vs. Input Voltage (VOUT = 3.3V) ......................................................................................... 10
Standby Current vs. Input Voltage ....................................................................................................... 11
Standby Current vs. Temperature ....................................................................................................... 11
Output Voltage vs. Temperature.......................................................................................................... 11
Oscillator Frequency vs. Temperature (Iout=300mA) ......................................................................... 11
Quiescent Current vs. Temperature (No load) ................................................................................... 11
Input Current vs. Temperature (No load, No switching) ..................................................................... 11
ZSPM4012B Block Diagram ................................................................................................................ 12
Monitor and Control Logic Functionality .............................................................................................. 13
Typical Application for Adjustable Output Voltage............................................................................... 15
Typical Application for Fixed Output Voltage ....................................................................................... 15
ZSPM4012B 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 1.5
Table 5.1
Absolute Maximum Ratings ................................................................................................................... 5
Thermal Characteristics ......................................................................................................................... 5
Recommended Operating Conditions ................................................................................................... 6
Electrical Characteristics ....................................................................................................................... 6
Regulator Characteristics ...................................................................................................................... 7
Pin Description, 16 lead, 3x3mm QFN ................................................................................................ 18
© 2016 Integrated Device Technology, Inc.
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January 27, 2016
ZSPM4012B Datasheet
1
ZSPM4012B 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
Absolute Maximum Ratings
Parameter
Value
1)
Over operating free–air temperature range unless otherwise noted.
Table 1.1
UNIT
V
V
V
V
V
V
°C
Voltage on VCC pin
Voltage on BST pin
Voltage on VSW pin
Voltage on EN, PG, FB pins
Electrostatic Discharge – Human Body Model
2)
2)
-0.3 to 26.4
-0.3 to (VCC+6)
-1 to 26.4
-0.3 to 6
+/-2k
+/-500
260
Electrostatic Discharge – Charge Device Model
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.
Table 1.2
Thermal Characteristics
Thermal Characteristics
Parameter
Symbol
1)
1)
Value
34.5
2.5
-65 to 150
150
-40 to 125
Unit
°C/W
°C/W
°C
°C
°C
Thermal Resistance Junction to Air
θ
JA
θ
Jc
T
STG
T
J MAX
T
J
Thermal Resistance Junction to Case
Storage Temperature Range
Maximum Junction Temperature
Operating Junction Temperature Range
1)
Assumes 1 in
2
area of 2 oz. copper and 25
°
C ambient temperature.
© 2016 Integrated Device Technology, Inc.
5
January 27, 2016
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