BOARD EVAL BASED ON ST1S12

STEVAL-ISA055V1

Manufacturer Part NumberSTEVAL-ISA055V1
DescriptionBOARD EVAL BASED ON ST1S12
ManufacturerSTMicroelectronics
TypeDC/DC Switching Converters, Regulators & Controllers
STEVAL-ISA055V1 datasheets
 


Specifications of STEVAL-ISA055V1

Mfg Application NotesST1S12 AppNoteMain PurposeDC/DC, Step Down
Outputs And Type1, Non-IsolatedVoltage - Output1.2V
Current - Output700mAVoltage - Input2.5 ~ 5.5V
Regulator TopologyBuckFrequency - Switching1.7MHz
Board TypeFully PopulatedUtilized Ic / PartST1S12
Input Voltage2.5 V to 5.5 VOutput Voltage1.2 V
ProductPower Management ModulesSilicon ManufacturerST Micro
Silicon Core NumberST1S12XXKit Application TypePower Management - Voltage Regulator
Application Sub TypeSynchronous Buck ConverterKit ContentsBoard
Lead Free Status / RoHS StatusLead free / RoHS CompliantPower - Output-
For Use With/related ProductsST1S12xOther names497-8219
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Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or
adjustable step-down switching regulator in TSOT23-5L
Features
Step-down current mode PWM (1.7 MHz) DC-
DC converter
3% DC output voltage tolerance
Synchronous rectification
Fixed output voltage 1.2 V, 1.8 V, and ADJ
(available on request 1.5 V, 2.5 V and 3.3 V)
Enable function
Internal soft start
Typical efficiency: > 90%
0.7 A output current capability
Not switching quiescent current: max 600 µA
over temperature range
R
typ. 250 mΩ and 400 mΩ
DSON
Uses tiny capacitors and inductors
Operative junction temp. -40°C to 125°C
Available in TSOT23-5L package
Description
The ST1S12Gxx is a step down DC-DC converter
optimized for powering low-voltage digital cores in
HDD applications and, generally, to replace the
high current linear solution when the power
dissipation may cause high heating of the
application environment. It provides up to 0.7 A
over an input voltage range of 2.5 V to 5.5 V. A
high switching frequency (1.7 MHz) allows the
use of tiny surface-mount components. In addition
to the resistor divider to set the output voltage
value, only an inductor and two capacitors are
Table 1.
Device summary
Part numbers
ST1S12XX
ST1S12XX12
ST1S12XX18
February 2010
ST1S12XX12, ST1S12XX18
required. Moreover, a low output ripple is
guaranteed by the current mode PWM topology
and by the use of low ESR SMD ceramic
capacitors. The device is thermally protected and
the current is limited to prevent damage due to
accidental short-circuit. The ST1S12Gxx is
available in the TSOT23-5L package.
Order codes
ST1S12GR
ST1S12G12R
ST1S12G18R
Doc ID 14314 Rev 3
ST1S12XX
TSOT23-5L
Package
TSOT23-5L
TSOT23-5L
TSOT23-5L
1/20
www.st.com
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STEVAL-ISA055V1 Summary of contents

  • Page 1

    Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or adjustable step-down switching regulator in TSOT23-5L Features ■ Step-down current mode PWM (1.7 MHz) DC- DC converter ■ output voltage tolerance ■ Synchronous rectification ■ Fixed output voltage ...

  • Page 2

    Contents Contents 1 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

  • Page 3

    ST1S12XX, ST1S12XX12, ST1S12XX18 1 Schematic Figure 1. Schematic diagram V Σ SOFT START REF1 V IN UVLO SUM V RST Comp MOSFET CONTROL LOGIC V SET OSC SHUT DOWN EN FB/V O Doc ID 14314 Rev 3 + ...

  • Page 4

    Pin configuration 2 Pin configuration Figure 2. Pin connections (top view) Table 2. Pin description Pin n° Symbol GND FB/V O 4/20 Name and function Enable pin System ground Switching pin ...

  • Page 5

    ST1S12XX, ST1S12XX12, ST1S12XX18 3 Maximum ratings Table 3. Absolute maximum ratings Symbol V Positive power supply voltage IN V Enable voltage EN SWITCH Voltage Max. voltage of output pin V /V Feedback voltage Output voltage (for V ...

  • Page 6

    Electrical characteristics 4 Electrical characteristics 3 otherwise specified. Typical values are referred to 25 °C). Table 6. Electrical characteristics for ST1S12G Symbol Parameter FB Feedback voltage I V pin bias current FB ...

  • Page 7

    ST1S12XX, ST1S12XX12, ST1S12XX18 specified. Typical values are referred to 25 °C). Table 7. Electrical characteristics for ST1S12G12 Symbol Parameter OUT Output feedback pin I V pin bias current Minimum ...

  • Page 8

    Electrical characteristics 3 specified. Typical values are referred to 25 °C). Table 8. Electrical characteristics for ST1S12G18 Symbol Parameter OUT Output feedback pin I V pin bias current Minimum input ...

  • Page 9

    ST1S12XX, ST1S12XX12, ST1S12XX18 5 Typical application Figure 3. Application circuit Doc ID 14314 Rev 3 Typical application 9/20 ...

  • Page 10

    Application notes 6 Application notes The ST1S12Gxx is an adjustable current mode PWM step-down DC-DC converter with internal 0.7 A power switch, packaged in TSOT23-5L. This device is a complete 0.7 A switching regulator, with its internal compensation eliminating the ...

  • Page 11

    ST1S12XX, ST1S12XX12, ST1S12XX18 7 Typical performance characteristics Unless otherwise specified, refer to the typical application circuit under the following conditions 4.7 µ Figure 4. Voltage feedback vs. temperature 650 650 =3.6V, I ...

  • Page 12

    Typical performance characteristics Figure 10. Efficiency vs. temperature 100 100 =3V, V =3V, V =1.2V =1. ...

  • Page 13

    ST1S12XX, ST1S12XX12, ST1S12XX18 Figure 16. Reference load regulation vs. temperature 0.005 0.005 V V =3.6V, I =3.6V, I from 10mA to 0.7A, V from 10mA to 0.7A OUT OUT 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 ...

  • Page 14

    Typical performance characteristics Figure 22. Line transient from 4 5 350 mA OUT 10µ 1.8 V OUT Figure 24. Start-up transient from 0 V ...

  • Page 15

    ST1S12XX, ST1S12XX12, ST1S12XX18 8 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 ...

  • Page 16

    Package mechanical data Dim. Min 0.7 b 0 0.3 16/20 TSOT23-5L mechanical data mm. Typ. Max. 1.1 0.1 1.0 0.5 0.2 2.9 2.8 1.6 0.95 1.9 0.6 Doc ...

  • Page 17

    ST1S12XX, ST1S12XX12, ST1S12XX18 Tape & reel TSOT23-5L mechanical data Dim. Min 12 3.13 Bo 3.07 Ko 1.27 Po 3.9 P 3.9 mm. Typ. Max. Min. 180 13.0 13.2 0.504 0.795 2.362 14.4 ...

  • Page 18

    Package mechanical data Figure 26. TSOT23-5L footprint recommended data Table 9. Footprint data 18/20 ST1S12XX, ST1S12XX12, ST1S12XX18 Values mm. 3.50 1.10 0.60 0.95 1.20 2.30 Doc ID 14314 Rev 3 inch. 0.138 0.043 0.024 ...

  • Page 19

    ST1S12XX, ST1S12XX12, ST1S12XX18 9 Revision history Table 10. Document revision history Date Revision 10-Jan-2008 1 01-Feb-2008 2 23-Feb-2010 3 Initial release. Modified: Figure 3 on page 9. Modified: V valueTable 3 on page IN Doc ID 14314 Rev 3 Revision ...

  • Page 20

    ... 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. ...