EVAL5985 STMicroelectronics, EVAL5985 Datasheet

BOARD EVAL FOR L5985

EVAL5985

Manufacturer Part Number
EVAL5985
Description
BOARD EVAL FOR L5985
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Datasheets

Specifications of EVAL5985

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
3.3V
Current - Output
2A
Voltage - Input
3.3 ~ 18V
Regulator Topology
Buck
Frequency - Switching
500kHz
Board Type
Fully Populated
Utilized Ic / Part
L5985
Input Voltage
2.9 V to 18 V
Output Voltage
0.6 V to 16 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
L5985
Kit Application Type
Power Management - Voltage Regulator
Application Sub Type
Step Down Switching Regulator
Kit Contents
Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
L5985
Other names
497-6387
EVAL5985

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
EVAL5985
Manufacturer:
ST
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Features
Description
The EVAL5985 demonstration board provides the
design engineer with a fully functional step-down
switching regulator with an output current of up to
2 A. The board integrates STMicroelectronics’
L5985 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 L5985 device.
The board features an external resistor divider
(R1 and R2) designed for an output voltage
of 3.3 V.
The output voltage can be set to a level from 0.6 V
up to the rated voltage of the output capacitor
(16 V).
January 2009
For further information contact your local STMicroelectronics sales office.
2 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
Over-current and thermal protection
VFQFPN8 3 mm x 3 mm package
2 A step-down switching regulator demonstration board
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 L5985
EVAL5985
EVAL5985
Data Brief
www.st.com
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EVAL5985 Summary of contents

Page 1

... Over-current and thermal protection ■ VFQFPN8 package Description The EVAL5985 demonstration board provides the design engineer with a fully functional step-down switching regulator with an output current The board integrates STMicroelectronics’ L5985 step-down switching regulator, together with all the external components required for a typical application ...

Page 2

... EVAL5985 1 EVAL5985 application circuit and component list Figure 1. Application circuit Figure 2. Package Table 1. Component list Reference C1 GRM31CR61E106KA12 C2 GRM31CR61C226KE15B Part number Description 10 µ µ 2 220 pF nF 4.99 kΩ, 1%, 0.1 W 0603 1.1 kΩ, 1%, 0.1 W 0603 330 Ω, 1%, 0.1 W 0603 2.49 kΩ, 1%, 0.1 W 0603 100 kΩ ...

Page 3

... PCB layout 2 PCB layout Figure 3. PCB layout (component side) Figure 4. PCB layout (bottom side) Figure 5. PCB layout (front side) 3/4 EVAL5985 ...

Page 4

... EVAL5985 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. 4/4 ...

Page 5

... Revision history 4 Revision history Table 2. Document revision history Date 19-Jan-2009 5/4 Revision 1 Initial release EVAL5985 Changes ...

Page 6

... EVAL5985 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...

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