ZSPM4011AA1W15 [ETC]
High Efficiency 1A Synchronous Buck Converter;
| 型号： | ZSPM4011AA1W15 |
| 厂家： | 
ETC |
| 描述： | High Efficiency 1A Synchronous Buck Converter |
| 文件： | 总22页 (文件大小：1206K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet
Rev. 1.03 / September 2012
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
Power and Precision
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
Brief Description
Benefits
The ZSPM4011 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.
Increased battery life
Minimal external component count
(3 capacitors, 1 inductor)
Inherent fault protection and reporting
Available Support
The ZSPM4011 utilizes current mode feedback in
normal regulation pulse-width modulation (PWM)
mode. When the regulator is disabled (EN pin is
low), the ZSPM4011 draws less than 10µA quies-
cent current.
Evaluation Kit
Documentation
Physical Characteristics
Junction operating temperature -40°C to 125°C
Packaged in a 16pin QFN (3x3mm)
The ZSPM4011 integrates a wide range of
protection circuitry, including input supply under-
voltage lockout, output voltage soft start, current
limit, VOUT over-voltage, and thermal shutdown.
Related ZMDI Products
The ZSPM4011 includes supervisory reporting
through the PG (Power Good) open drain output to
interface other components in the system.
ZSPM4012/ZSPM4013: 2A/3A synchronous
buck converters, available with adjustable out-
put from 0.9 to 5V or fixed output voltages at
1.5V, 1.8V, 2.5V, 3.3V, 5.0V(16-pin 3x3 QFN)
ZSPM1000: >5A single-phase, single-rail, true
digital PWM controller (24-lead 4x4mm QFN)
Features
Output voltage options depending on order
code:
ZSPM4011 Application Circuits
.
Fixed output voltages: 1.5V, 1.8V, 2.5V,
3.3V, or 5V with +/- 2% output tolerance
Adjustable Output
BST
CBST
VCC
CBYPASS
VCC
.
Adjustable output voltage range: 0.9V to 5V
with +/- 1.5% reference
VSW
FB
VOUT
COUT
LOUT
RTOP
RBOT
Wide input voltage range:
6V to 24V
VOUT
1MHz +/- 10% fixed switching frequency
1A continuous output current
10 kΩ
(optional)
EN
EN
High efficiency – up to 95%
PG
PG
Current mode PWM control with pulse-
frequency modulation (PFM) mode for
improved light load efficiency
Fixed Output
BST
VCC
VCC
CBST
Voltage supervisor for VOUT reported at the PG
pin
CBYPASS
VOUT
VSW
FB
LOUT
Input supply under voltage lockout
COUT
Soft start for controlled startup with no
overshoot
VOUT
10kΩ
(optional)
EN
EN
Full protection for over-current, over-
temperature, and VOUT over-voltage
PG
PG
Less than 10µA in Disabled Mode
Low external component count
For more information, contact ZMDI via analog@zmdi.com.
© 2012 Zentrum Mikroelektronik Dresden AG — Rev.1.03 — September 21, 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.
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
ZSPM4011 Block Diagram
PG
EN
VCC
VCC
4.2V
VCC
Under-Voltage
Protection
MONITOR
&
VCC
CONTROL
Over-Voltage
Protection
FB
Bootstrap
Voltage
Oscillator
Thermal
Protection
BST
Ramp
Generator
Over Current
Protection
VCC
Vref
&
CBST
Typical Applications
Gate
Drive
Soft Start
VSW
Gate Drive
Control
VOUT
COUT
LOUT
Wireless access points,
cable modems
Comparator
Vref
Gate
Drive
Error Amp
Set-top boxes
PGND
FB
DVD, LCD, LED supplies
Compensation
Network
RTOP
Portable products,
including GPS, smart
phones, tablet PCs
PFM Mode
Comparator
RBOT
GND
Printers
Ordering Information
Ordering Code
Description
Package
ZSPM4011AA1W00
ZSPM4011, 1A Synchronous Buck Converter: adjustable output, 0.9V to 5V,
16-pin 3x3mm QFN
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
ZSPM4011AA1W15
ZSPM4011AA1W18
ZSPM4011AA1W25
ZSPM4011AA1W33
ZSPM4011AA1W50
ZSPM4011KIT
ZSPM4011, 1A Synchronous Buck Converter: fixed output, 1.5V,16-pin 3x3mm QFN
ZSPM4011, 1A Synchronous Buck Converter: fixed output, 1.8V,16-pin 3x3mm QFN
ZSPM4011, 1A Synchronous Buck Converter: fixed output, 2.5V,16-pin 3x3mm QFN
ZSPM4011, 1A Synchronous Buck Converter: fixed output, 3.3V,16-pin 3x3mm QFN
ZSPM4011, 1A Synchronous Buck Converter: fixed output, 5.0V,16-pin 3x3mm QFN
ZSPM4011KIT, Evaluation Kit for 1A Synchronous Buck Converter
Sales and Further Information
www.zmdi.com
analog@zmdi.com
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. Keelung Road
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
ZMD FAR EAST, Ltd.
3F, No. 51, Sec. 2,
Zentrum Mikroelektronik
Dresden AG, Korean Office
POSCO Centre Building
West Tower, 11th Floor
892 Daechi, 4-Dong,
Kangnam-Gu
11052 Taipei
Taiwan
Seoul, 135-777
Korea
Phone +49.351.8822.7.776
Phone 855-ASK-ZMDI
(855-275-9634)
Phone +81.3.6895.7410
Phone +886.2.2377.8189 Phone +82.2.559.0660
Fax +886.2.2377.8199 Fax +82.2.559.0700
Fax
+49.351.8822.8.7776
Fax
+81.3.6895.7301
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.1.03— September 21, 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.
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
Contents
1
ZSPM4011 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. 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 3x3 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. PG Output, PG (Pin #8) .......................................................................................................................19
Ordering Information .........................................................................................................................................20
Related Documents...........................................................................................................................................20
Glossary ............................................................................................................................................................20
Document Revision History...............................................................................................................................21
2
3
4
5
6
7
8
9
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
4 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
List of Figures
Figure 2.1 Startup Response ................................................................................................................................10
Figure 2.2 100mA to 1A Load Step (Vcc= 12V, Vout =1.8V)................................................................................10
Figure 2.3 100mA to 2A Load (Vcc=12V, Vout = 1.8V)........................................................................................10
Figure 2.4 100mA t0 1A Load Step (Vcc=12V, Vout = 3.3V)................................................................................10
Figure 2.5 100mA to 2A Load Step (Vcc=12V, Vout = 3.3V)................................................................................10
Figure 2.6 Line Transient Response (VCC=10V to 15V, Vout = 3.3V).................................................................10
Figure 2.7 Load Regulation...................................................................................................................................11
Figure 2.8 Line Regulation (IOUT=1A) .................................................................................................................11
Figure 2.9 Efficiency vs. Output Current ( VOUT = 1.8V)........................................................................................11
Figure 2.10 Efficiency vs. Output Current ( VOUT = 3.3V)........................................................................................11
Figure 2.11 Efficiency vs. Output Current ( VOUT = 5V)...........................................................................................11
Figure 2.12 Efficiency vs. Input Voltage (VOUT = 3.3V)............................................................................................11
Figure 2.13 Standby Current vs. Input Voltage.......................................................................................................12
Figure 2.14 Standby Current vs. Temperature .......................................................................................................12
Figure 2.15 Output Voltage vs. Temperature..........................................................................................................12
Figure 2.16 Oscillator Frequency vs. Temperature (Iout=300mA) .........................................................................12
Figure 2.17 Quiescent Current vs. Temperature (No load) ...................................................................................12
Figure 2.18 Input Current vs. Temperature (No load, No switching) .....................................................................12
Figure 3.1 ZSPM4011 Block Diagram ..................................................................................................................13
Figure 3.2 Monitor and Control Logic Functionality ..............................................................................................14
Figure 4.1 Typical Application for Adjustable Output Voltage...............................................................................15
Figure 4.2 Typical Application for Fixed Output Voltage.......................................................................................15
Figure 5.1 ZSPM4011 Package Drawing..............................................................................................................16
Figure 5.2 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
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. 1.03
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.
Data Sheet
September 21, 2012
5 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
1
ZSPM4011 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, and 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
Value1)
-0.3 to 26.4
-0.3 to (VCC+6)
-1 to 26.4
-0.3 to 6
+/-2k
UNIT
V
Voltage on VCC pin
Voltage on BST pin
V
Voltage on VSW pin
V
Voltage on EN, PG, FB pins
V
Electrostatic Discharge – Human Body Model 2)
Electrostatic Discharge – Charge Device Model 2)
Lead Temperature (soldering, 10 seconds)
V
+/-500
V
260
C
1) All voltage values are with respect to network ground terminal.
2) ESD testing is performed according to the respective JESD22 JEDEC standard.
1.2.
Thermal Characteristics
Thermal Characteristics
Parameter
Table 1.2
Symbol
JA
Value
Unit
°C/W
°C
Thermal Resistance Junction to Air 1)
38
Storage Temperature Range
TSTG
TJ MAX
TJ
-65 to 150
150
Maximum Junction Temperature
°C
Operating Junction Temperature Range
1) Assumes 1 in2 area of 2 oz. copper and 25C ambient temperature.
-40 to 125
°C
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
6 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
1.3. Recommended Operating Conditions
Table 1.3
Recommended Operating Conditions
Parameter
Symbol
VCC
Min
6
Typ
Max
24
Unit
V
Input Operating Voltage
12
Bootstrap Capacitor
CBST
17.6
3.76
33
2
22
4.7
26.4
5.64
nF
Output Filter Inductor Typical Value 1)
Output Filter Capacitor Typical Value 2)
Output Filter Capacitor ESR
LOUT
µH
µF
m
µF
COUT
44 (2 x 22)
35
COUT-ESR
CBYPASS
100
Input Supply Bypass Capacitor Typical Value 3)
8
10
1) For best performance, an inductor with a saturation current rating higher than the maximum VOUT load requirement plus the inductor
current ripple.
2) For best performance, a low ESR ceramic capacitor should be used.
3) 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
.
1.4. 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
VCC Supply Voltage
Input Supply Voltage
VCC
6
24
V
Quiescent Current:
Normal Mode
ICC-NORM
5.2
2.3
5
mA
VCC = 12V, ILOAD = 0A, EN 2.2
Quiescent Current:
Normal Mode, Non-switching
ICC-
NOSWITCH
mA
µA
VCC=12V, ILOAD=0A, EN 2.2
Non-switching
Quiescent Current:
Disabled Mode
ICC-DISABLE
VCC = 12V, EN = 0V
10
VCC Under Voltage Lockout
Input Supply Under Voltage
Threshold
VCC-UV
VCC Increasing
5.5
0.9
5.75
650
6.0
V
Input Supply Under Voltage
Threshold Hysteresis
VCC-
UV_HYST
mV
Oscillator
Oscillator Frequency
fOSC
1
1.1
MHz
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
7 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
Parameter
PG Open Drain Output
PG Release Timer
Symbol
Condition
Min
Typ
Max
Unit
TPG
10
Ms
µA
V
High-Level Output Leakage
Low-Level Output Voltage
EN Input Voltage Thresholds
High Level Input Voltage
Low Level Input Voltage
Input Hysteresis
IOH-PG
VPG = 5V
0.5
VOL-PG
IPG = -0.3mA
0.01
0.8
VIH-EN
VIL-EN
2.2
V
V
VHYST-EN
IIN-EN
480
3.5
mV
µA
µA
Input Leakage
VEN=5V
VEN=0V
-1.5
Thermal Shutdown
Thermal Shutdown Junction
Temperature
TSD
Note: Guaranteed by design
150
170
10
°C
°C
TSD Hysteresis
TSDHYST
1.5. Regulator Characteristics
Electrical Characteristics, TJ = -40°C to 125°C, VCC = 12V (unless otherwise noted)
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Switch Mode Regulator: L=4.7µH and C=2 x 22µF
Output Voltage Tolerance in
PWM Mode
VOUT-
PWM
VOUT
2%
–
–
VOUT
2%
+
ILOAD =1A
VOUT
V
Output Voltage Tolerance in
PFM Mode
VOUT-
PFM
VOUT
1%
VOUT
1%
+
VOUT +
3.5%
ILOAD = 0A
IVSW = -1A
V
High Side Switch On
Resistance
180
120
mΩ
mΩ
(See table note 1)
RDSON
Low Side Switch On
Resistance
IVSW = 1A
(See table note 1)
Output Current
IOUT
IOCD
1
A
A
Over Current Detect
HS switch current
1.4
1.8
0.9
2.4
Feedback Reference
(Adjustable Mode)
FBTH
0.886
-1.5
0.914
1.5
V
Feedback Reference
Tolerance
FBTH-TOL
%
ms
V
Soft Start Ramp Time
TSS
4
PFM Mode FB Comparator
Threshold
FBTH-PFM
VOUT
1%
+
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
8 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
Parameter
Symbol
Condition
Min
Typ
Max
Unit
VOUT Under Voltage
Threshold
VOUT-UV
91%
VOUT
93%
VOUT
95%
VOUT
VOUT Under Voltage
Hysteresis
VOUT-
UV_HYST
1.5%
VOUT
VOUT-OV
103%
VOUT
VOUT Over Voltage Threshold
VOUT Over Voltage
Hysteresis
VOUT-
OV_HYST
1% VOUT
97%
Max Duty Cycle
DUTYMAX
(See table note 2)
95%
99%
1) RDSON is characterized at 1A and tested at lower current in production.
2) Regulator VSW pin is forced off for 240ns every 8 cycles to ensure the BST cap is replenished.
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
9 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
2
Typical Performance Characteristics – ZSPM401x Family
Graphs apply to ZSPM401x ICs. See section 1 for ZSPM4011 characteristics. Unless otherwise noted, TJ = -40°C to 125°C, VCC = 12V.
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 t0 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=10V to 15V, Vout = 3.3V)
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
10 of 21
ZSPM4011
High Efficiency 1A 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)
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
11 of 21
ZSPM4011
High Efficiency 1A 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)
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
12 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
3
Description of Circuit
The ZSPM4011 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
ZSPM4011 Block Diagram
PG
EN
VCC
VCC
4.2V
VCC
Under-Voltage
Protection
MONITOR
&
VCC
CONTROL
Over-Voltage
Protection
FB
Bootstrap
Voltage
Oscillator
Thermal
Protection
BST
Ramp
Generator
Over Current
Protection
VCC
Vref
&
CBST
Gate
Drive
Soft Start
VSW
Gate Drive
Control
VOUT
COUT
LOUT
Comparator
Vref
Gate
Drive
Error Amp
PGND
FB
Compensation
Network
RTOP
PFM Mode
Comparator
RBOT
GND
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
13 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
Figure 3.2
Monitor and Control Logic Functionality
PG
Filter
VOUT-UV
Filter
EN
ENABLE
REGULATOR
Internal
Filter
POR
Filter
VCC-UV
Filter
VOUT-OV
TRI-STATE
VSW OUTPUT
Filter
TSD
OCD_Filter
IOCD
3.1. Internal Protection Details
3.1.1.
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 ZSPM4011 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
ZSPM4011 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 ZSPM4011 is held in the off state until VCC reaches 5.75V (typical). There is hysteresis on this input (see
section 1.4).
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
14 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
4
Application Circuits
4.1. 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
CBST
VCC
CBYPASS
VCC
VSW
FB
VOUT
COUT
LOUT
RTOP
RBOT
VOUT
10 kΩ
(optional)
EN
EN
PG
PG
Figure 4.2
Typical Application for Fixed Output Voltage
Fixed Output
BST
VCC
VCC
CBST
CBYPASS
VOUT
VSW
LOUT
COUT
FB
VOUT
10kΩ
(optional)
EN
EN
PG
PG
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
15 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
5
Pin Configuration and Package
Figure 5.1
ZSPM4011 Package Drawing
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
16 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
5.1. Marking Diagram & Pin-out
Figure 5.2
16 Lead 3x3mm QFN (top view)
4011: Part Name
MY: Date Code
A: Revision
M = Month
XXXXX: Lot number (last five digits)
O: Pin 1 mark
VL: Voltage level
1
2
3
4
5
6
7
8
9
A
B
C
January
February
March
April
May
15 1.5V
18 1.8V
25 2.5V
33 3.3V
50 5.0V
00 0.9V – 5.0V variable
June
July
August
September
October
November
December
Y = Year
A
B
C
Etc.
2011
2012
2013
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
17 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
5.2. Pin Description for 16 LEAD 3x3 QFN
Table 5.1
Pin Description, 16 lead, 3x3mm QFN
Name
Pin #
Function
Description
Connected to a 4.7µH (typical) inductor. Also connect to
additional VSW pins 12, 13, and 16.
VSW
1
Switching Voltage Node
VCC
VCC
2
3
Input Voltage
Input Voltage
Input voltage. Also connect to additional VCC pins 3 and 11.
Input voltage. Also connect to additional VCC pins 2 and 11.
Primary ground for the majority of the device except the low-
side power FET.
GND
FB
4
5
GND
Regulator FB voltage. Connects to VOUT for fixed-mode and
the output resistor divider for adjustable mode.
Feedback Input
NC
NC
PG
6
7
8
No Connect
No Connect
PG Output
Not connected.
Not connected.
Open-drain output.
Above 2.2V the device is enabled. Ground this pin to disable
the ZSPM4011. Includes internal pull-up.
EN
9
Enable Input
Bootstrap capacitor for the high-side FET gate driver.
Connect a 22nF ceramic capacitor from BST pin to VSW pin.
BST
VCC
VSW
10
11
12
Bootstrap Capacitor
Input Voltage
Input voltage. Also connect to additional VCC pins 2 and 3.
Connected to 4.7µH (typical) inductor. Also connect to
additional VSW pins 1, 13, and 16.
Switching Voltage Node
Connected to 4.7µH (typical) inductor. Also connect to
additional VSW pins 1, 12, and 16.
VSW
PGND
PGND
VSW
13
14
15
16
Switching Voltage Node
Power GND
GND supply for internal low-side FET/integrated diode. Also
connect to additional PGND pin 15.
GND supply for internal low-side FET/integrated diode. Also
connect to additional PGND pin 14.
Power GND
Connected to 4.7µH (typical) inductor. Also connect to
additional VSW pins 1, 12, and 13.
Switching Voltage Node
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
18 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
5.3. Detailed Pin Description
5.3.1.
Unregulated Input, VCC (Pins # 2, 3)
This terminal is the unregulated input voltage source for the ZSPM4011. 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 ZSPM4011, 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
reduce the duty cycle switch to a minimum off time on every 8th 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 ZSPM4011, 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.
PG 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.)
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
19 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
6
Ordering Information
Ordering Code
Description
Package
ZSPM4011AA1W00
ZSPM4011, 1A Synchronous Buck Converter: adjustable output, 0.9V to 5V,
16-pin 3x3mm QFN
7” reel with 1000 ICs
ZSPM4011AA1W15
ZSPM4011AA1W18
ZSPM4011AA1W25
ZSPM4011AA1W33
ZSPM4011AA1W50
ZSPM4011KIT
ZSPM4011, 1A Synchronous Buck Converter: fixed output, 1.5V,16-pin 3x3mm QFN
ZSPM4011, 1A Synchronous Buck Converter: fixed output, 1.8V,16-pin 3x3mm QFN
ZSPM4011, 1A Synchronous Buck Converter: fixed output, 2.5V,16-pin 3x3mm QFN
ZSPM4011, 1A Synchronous Buck Converter: fixed output, 3.3V,16-pin 3x3mm QFN
ZSPM4011, 1A Synchronous Buck Converter: fixed output, 5.0V,16-pin 3x3mm QFN
ZSPM4011KIT, Evaluation Kit for 1A Synchronous Buck Converter
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
7
8
Related Documents
Document
File Name
ZSPM4011 Feature Sheet
ZSPM4011_Feature_Sheet_rev_X_xy.pdf
ZSPM4011 Evaluation Kit Description
ZSPM4011_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.
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
PFM
ESR
Pulse width modulation (fixed frequency).
Pulse frequency modulation (fixed pulse width).
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.
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.03
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.
Data Sheet
September 21, 2012
20 of 21
ZSPM4011
High Efficiency 1A Synchronous Buck Converter
9
Document Revision History
Revision
1.00
Date
Description
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.
1.03
21-Sep-2012 Table 1.1 removed reference to “Dissipation Table.”
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.
Sales and Further Information
www.zmdi.com
analog@zmdi.com
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. Keelung Road
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
ZMD FAR EAST, Ltd.
3F, No. 51, Sec. 2,
Zentrum Mikroelektronik
Dresden AG, Korean Office
POSCO Centre Building
West Tower, 11th Floor
892 Daechi, 4-Dong,
Kangnam-Gu
11052 Taipei
Taiwan
Seoul, 135-777
Korea
Phone +49.351.8822.7.776
Phone 855-ASK-ZMDI
(855-275-9634)
Phone +81.3.6895.7410
Phone +886.2.2377.8189 Phone +82.2.559.0660
Fax +886.2.2377.8199 Fax +82.2.559.0700
Fax
+49.351.8822.8.7776
Fax
+81.3.6895.7301
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. 1.03
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.
Data Sheet
September 21, 2012
21 of 21
Mouser Electronics
Authorized Distributor
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