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ZSPM4012BA1W18: DescriptionHigh Efficiency 2A Synchronous Buck Converter; File Size1MB，23 Pages; ManufacturerETC2

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High Efficiency 2A Synchronous Buck Converter

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Data Sheet

Rev. 1.00 / April 2013

ZSPM4012B

High Efficiency 2A Synchronous Buck Converter

Analog Power ICs

Powerful

and Determined

ZSPM4012B

High Efficiency 2A Synchronous Buck Converter

Contents

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

Data Sheet

April 4, 2013

prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

4 of 22

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

April 4, 2013

prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

5 of 22

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Description	High Efficiency 2A Synchronous Buck Converter	High Efficiency 2A Synchronous Buck Converter	High Efficiency 2A Synchronous Buck Converter	High Efficiency 2A Synchronous Buck Converter	High Efficiency 2A Synchronous Buck Converter	High Efficiency 2A Synchronous Buck Converter	High Efficiency 2A Synchronous Buck Converter

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