STEVAL-ISA044V2 STMicroelectronics, STEVAL-ISA044V2 Datasheet

BOARD EVAL BASED ON ST1S10

STEVAL-ISA044V2

Manufacturer Part Number
STEVAL-ISA044V2
Description
BOARD EVAL BASED ON ST1S10
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Datasheets

Specifications of STEVAL-ISA044V2

Mfg Application Notes
ST1S10 AppNote
Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Current - Output
3A
Voltage - Input
2.5 ~ 18V
Regulator Topology
Buck
Frequency - Switching
900kHz
Board Type
Fully Populated
Utilized Ic / Part
ST1S10
Input Voltage
2.5 V to 18 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
ST1S10
Kit Application Type
Power Management - Voltage Regulator
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Power - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
ST1S10
Other names
497-8229
STEVAL-ISA044V2
Features
Applications
Table 1.
March 2011
Step-down current mode PWM regulator
Output voltage adjustable from 0.8 V
Input voltage from 2.5 V up to 18 V
2% DC output voltage tolerance
Synchronous rectification
Inhibit function
Synchronizable switching frequency from 400
kHz up to 1.2 MHz
Internal soft start
Dynamic short circuit protection
Typical efficiency: 90%
3 A output current capability
Stand-by supply current: max 6 µA over
temperature range
Operative junction temp: from - 25 °C to 125 °C
Consumer
– STB, DVD, DVD recorders, TV, VCR, car
Networking
– XDSL, modems, DC-DC modules
Computer
– Optical storage, HD drivers, printers,
Industrial and security
– Battery chargers, DC-DC converters, PLD,
audio, LCD monitors
audio/graphic cards
PLA, FPGA, LED drivers
Part number
Device summary
ST1S10
Doc ID 13844 Rev 4
DFN8 (4 x 4 mm)
3 A, 900 kHz, monolithic synchronous
ST1S10PUR
Description
The ST1S10 is a high efficiency step-down PWM
current mode switching regulator capable of
providing up to 3 A of output current. The device
operates with an input supply range from 2.5 V to
18 V and provides an adjustable output voltage
from 0.8 V (V
R1 / R2)]. It operates either at a 900 kHz fixed
frequency or can be synchronized to an external
clock (from 400 kHz to 1.2 MHz). The high
switching frequency allows the use of tiny SMD
external components, while the integrated
synchronous rectifier eliminates the need for a
Schottky diode. The ST1S10 provides excellent
transient response, and is fully protected against
thermal overheating, switching over-current and
output short circuit. The ST1S10 is the ideal
choice for point-of-load regulators or LDO pre-
regulation.
DFN8 (4 x 4 mm)
Order codes
FB
step-down regulator IC
) to 0.85*V
IN_SW
ST1S10PHR
PowerSO-8
PowerSO-8
[V
ST1S10
OUT
= V
www.st.com
FB
*(1 +
1/26
26

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STEVAL-ISA044V2 Summary of contents

Page 1

Features ■ Step-down current mode PWM regulator ■ Output voltage adjustable from 0.8 V ■ Input voltage from 2 ■ output voltage tolerance ■ Synchronous rectification ■ Inhibit function ■ Synchronizable switching frequency ...

Page 2

Contents Contents 1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

ST1S10 1 Application circuit Figure 1. Typical application circuit 12V 12V VIN_SW VIN_SW 4.7µF 4.7µF VIN_A VIN_A C3 C3 0.1µF 0.1µ ST1S10 ST1S10 FB FB SYNC SYNC AGND AGND PGND PGND Doc ID 13844 ...

Page 4

Pin configuration 2 Pin configuration Figure 2. Pin connections (top view for PowerSO-8, bottom view for DFN8) DFN8 (4x4) Table 2. Pin description Pin n° Symbol 1 V IN_A 2 INH (EN AGND 5 SYNC 6 ...

Page 5

ST1S10 3 Maximum ratings Table 3. Absolute maximum ratings Symbol V Positive power supply voltage IN_SW V Positive supply voltage IN_A V Inhibit voltage INH V Output switch voltage SW V Feedback voltage current FB Sync Synchronization ...

Page 6

Electrical characteristics 4 Electrical characteristics IN_SW +0.1 µ µ 3.3 µH, T OUT the typical application circuit. Typical values assume T Table 5. Electrical characteristics Symbol Parameter V Feedback ...

Page 7

ST1S10 Table 5. Electrical characteristics (continued) Symbol Parameter I I SYNC input current IL, IH UVLO Under voltage lock-out threshold 1. Guaranteed by design, but not tested in production. 2. See output voltage selection paragraph 5.5 for maximum duty cycle ...

Page 8

Application information 5 Application information 5.1 Description The ST1S10 is a high efficiency synchronous step-down DC-DC converter with inhibit function. It provides over an input voltage range of 2 and the output ...

Page 9

ST1S10 Equation OUT F where V is the voltage drop across the internal NMOS, and V F drop across the internal PDMOS. The minimum duty cycle (at V duty cycle (at ...

Page 10

Application information reduce ripple voltages due to the parasitic inductive effect, the output capacitor connection paths should be kept as short as possible. The ST1S10 has been designed to perform best with ceramic capacitors. Under typical application conditions a minimum ...

Page 11

ST1S10 Equation {[ OUT OUT is the junction-to-ambient thermal resistance, η is the efficiency at the rated where R thJA I current and T OUT To ensure safe operating conditions the application should be ...

Page 12

Application information 5.8.2 Inhibit function The inhibit pin can be used to turn OFF the regulator when pulled down, thus drastically reducing the current consumption down to less than 6 µA. When the inhibit feature is not used, this pin ...

Page 13

ST1S10 Figure 3. Application schematic for heavy capacitive load 12V 12V VIN_SW VIN_SW 10µF 10µF VIN_A VIN_A C3 C3 4.7µF 4.7µF (*) see OCP and SCP descriptions for C2 and C4 selection Figure 4. Application schematic ...

Page 14

Layout considerations 6 Layout considerations Layout is an important step in design for all switching power supplies. High-speed operation (900 kHz) of the ST1S10 device demands careful attention to PCB layout. Care must be taken in board layout to get ...

Page 15

ST1S10 Figure 7. PCB layout suggestion 6.1 Thermal considerations The lead frame die pad, of ST1S10, is exposed at the bottom of the package and must be soldered directly to a properly designed thermal pad on the PCB, the addition ...

Page 16

Diagram 7 Diagram Figure 8. Block diagram 16/26 Doc ID 13844 Rev 4 ST1S10 ...

Page 17

ST1S10 8 Typical performance characteristics Unless otherwise specified, refer to the typical application circuit under the following conditions 25° mA, C OUT IN Figure 9. Voltage feedback vs. temperature 830 830 830 820 ...

Page 18

Typical performance characteristics Figure 15. ON mode quiescent current vs. temperature 1.8 1.8 1.6 1.6 1.4 1.4 1.2 1 0.8 0.8 0.6 0.6 0.4 0 =12V, V =12V, V =1.2V, V =1.2V, V IN-A ...

Page 19

ST1S10 Figure 21. Efficiency vs. output current 100 100 =5V, V =5V, V IN-A IN-A IN-SW IN-SW INH INH 0.5 0.5 1 ...

Page 20

Package mechanical data 9 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 21

ST1S10 PowerSO-8 (exposed pad) mechanical data Dim ccc mm. Min. Typ. 0.00 1.25 0.31 0.17 4.80 4.90 ACCORDING TO PAD SIZE 5.80 6.00 3.80 3.90 ACCORDING ...

Page 22

Package mechanical data Dim. Min 0.23 D 3.90 D2 2.82 E 3. 0.40 22/26 DFN8 (4x4) mechanical data mm. Typ. Max. 0.90 1.00 0.02 0.05 0.20 0.30 0.38 4.00 4.10 ...

Page 23

ST1S10 Dim. Min 12 8.1 Bo 5.5 Ko 2.1 Po 3.9 P 7.9 Tape & reel SO-8 mechanical data mm. Typ. Max. 330 13.2 22.4 8.5 5.9 2.3 4.1 8.1 Doc ID ...

Page 24

Package mechanical data Tape & reel QFNxx/DFNxx (4x4) mechanical data Dim. Min 12 24/26 mm. Typ. Max. Min. 330 13.2 0.504 0.795 101 3.898 14.4 4.35 4.35 1.1 ...

Page 25

ST1S10 10 Revision history Table 6. Document revision history Date Revision 28-Aug-2007 1 24-Sep-2007 2 25-Oct-2007 3 10-Mar-2011 4 Initial release. Add R on Table 4. thJC Added new paragraph 6: Layout considerations. Updated PowerSO-8 package mechanical data and Doc ...

Page 26

... 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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