EVAL5987 STMicroelectronics, EVAL5987 Datasheet

BOARD EVALUATION FOR L5987

EVAL5987

Manufacturer Part Number
EVAL5987
Description
BOARD EVALUATION FOR L5987
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Datasheets

Specifications of EVAL5987

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
1.8V
Current - Output
3A
Voltage - Input
2.9 ~ 18V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
L5987
Input Voltage
2.9 to 18 V
Output Voltage
1.8 V
Operating Supply Voltage
2.9 to 18 V
Product
Power Management Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Frequency - Switching
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
L5987
Other names
497-8369

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
EVAL5987
Manufacturer:
ST
0
Part Number:
EVAL5987A
Manufacturer:
ST
0
Features
Description
The EVAL5987/A demonstration board provides
the design engineer with a fully functional step-
down switching regulator with an output current of
up to 3 A. The board integrates
STMicroelectronics’ L5987/A step-down switching
regulator, together with all the external
components required for a typical application.
The rated voltage of the input capacitor and the
Schottky diode rectifier repetitive peak reverse
voltage are both 25 V, making the board capable
of covering the entire 2.9 V - 18 V input voltage
range of the L5987/A device.
The board features an external resistor divider
(R1 and R2) designed for an output voltage
of 1.8 V.
The output voltage can be set to a level from 0.6 V
up to the input voltage.
November 2009
For further information contact your local STMicroelectronics sales office.
3 A DC output current
2.9 V to 18 V input voltage
Output voltage adjustable from 0.6 V to 16 V
250 kHz switching frequency, programmable
up to 1 MHz
Internal soft-start and inhibit
Low dropout operation: 100% duty cycle
Zero-load current operation
Overcurrent and thermal protection
VFQFPN8 3 mm x 3 mm package or HSOP8
for the L5987A
3 A step-down switching regulator demonstration board
Doc ID 16613 Rev 1
The compensation network on the demonstration
board allows the use of MLCC as output filter to
keep the loop stable. The inductor saturation
current and forward current of the Schottky diode
are within the current limit values.
The switching frequency on the demonstration
board is set to 500 kHz by means of the R5
resistor connected to pin Fsw.
based on the L5987, L5987A
EVAL5987A
EVAL5987
www.st.com
Data brief
1/6
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EVAL5987 Summary of contents

Page 1

... Overcurrent and thermal protection ■ VFQFPN8 package or HSOP8 for the L5987A Description The EVAL5987/A demonstration board provides the design engineer with a fully functional step- down switching regulator with an output current The board integrates STMicroelectronics’ L5987/A step-down switching regulator, together with all the external components required for a typical application ...

Page 2

... EVAL5987/A application circuit and component list 1 EVAL5987/A application circuit and component list Figure 1. Application circuit Figure 2. Package Table 1. Component list Reference C1 GRM32ER61E226KE15 GRM32ER61E226KE15 2/6 Part number Description 330 pF 220 nF 4.99 kΩ, 1%, 0.1 W 0603 2.49 kΩ, 1%, 0.1 W 0603 330 Ω, 1%, 0.1 W 0603 2 kΩ ...

Page 3

... EVAL5987 - EVAL5987A 2 PCB layout Figure 3. PCB layout (component side) Figure 4. PCB layout (bottom side) Figure 5. PCB layout (front side) Doc ID 16613 Rev 1 PCB layout 3/6 ...

Page 4

... Package mechanical data 3 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ® ECOPACK trademark. 4/6 Doc ID 16613 Rev 1 EVAL5987 - EVAL5987A ...

Page 5

... EVAL5987 - EVAL5987A 4 Revision history Table 2. Document revision history Date 04-Nov-2009 Revision 1 Initial release Doc ID 16613 Rev 1 Revision history Changes 5/6 ...

Page 6

... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 6/6 Please Read Carefully: © 2009 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com Doc ID 16613 Rev 1 EVAL5987 - EVAL5987A ...

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