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ZSPM4011AA1W33: DescriptionHigh Efficiency 1A Synchronous Buck Converter; File Size1MB，22 Pages; ManufacturerETC2

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High Efficiency 1A Synchronous Buck Converter

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Data Sheet

Rev. 1.03 / September 2012

ZSPM4011

High Efficiency 1A Synchronous Buck Converter

Power and Precision

ZSPM4011

High Efficiency 1A Synchronous Buck Converter

Contents

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

Data Sheet

September 21, 2012

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

4 of 21

ZSPM4011

High Efficiency 1A 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 t0 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 (IOUT=1A) ................................................................................................................. 11

Efficiency vs. Output Current ( V

OUT

= 1.8V) ........................................................................................ 11

Efficiency vs. Output Current ( V

OUT

= 3.3V) ........................................................................................ 11

Efficiency vs. Output Current ( V

OUT

= 5V) ........................................................................................... 11

Efficiency vs. Input Voltage (V

OUT

= 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

ZSPM4011 Block Diagram .................................................................................................................. 13

Monitor and Control Logic Functionality .............................................................................................. 14

Typical Application for Adjustable Output Voltage............................................................................... 15

Typical Application for Fixed Output Voltage ....................................................................................... 15

ZSPM4011 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 5.1

Absolute Maximum Ratings ................................................................................................................... 6

Thermal Characteristics ......................................................................................................................... 6

Recommended Operating Conditions ................................................................................................... 7

Electrical Characteristics ....................................................................................................................... 7

Pin Description, 16 lead, 3x3mm QFN ................................................................................................ 18

Data Sheet

September 21, 2012

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

5 of 21

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