Product Information

STEVAL-ISA139V1

STEVAL-ISA139V1 electronic component of STMicroelectronics

Datasheet
Power Management IC Development Tools 350 mA valley current limit adjustable step down regulator based on the PM6644

Manufacturer: STMicroelectronics
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0 - WHS 1

MOQ : 1
Multiples : 1

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STEVAL-ISA139V1
STMicroelectronics

1 : USD 77.7262
N/A

Obsolete
0 - WHS 2

MOQ : 1
Multiples : 1

Stock Image

STEVAL-ISA139V1
STMicroelectronics

1 : USD 74.025
N/A

Obsolete
     
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RoHS - XON
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Tool Is For Evaluation Of
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Output Current
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STEVAL-ISA139V1 350 mA valley current limit adjustable step-down regulator based on the PM6644 Data brief Description This product evaluation board is based on STMicroelectronics PM6644. The device combines a 350 mA valley current limit step-down regulator with a high accuracy 3.3 V voltage reference in a small DFN10 3x3 package. The switching regulator is based on a CoT (constant on time) architecture that assures fast load transient response. The embedded voltage feed-forward provides nearly constant switching frequency operation. Pulse-skipping is employed to increase efficiency at very light load. The switching frequency can be adjusted from 200 kHz to 600 kHz by means of a simple resistor. The switching regulator can be programmed to regulate a fixed value of 3.43 V or it can deliver Features an adjustable voltage, depending on the FB pin 4.5 V to 25 V input voltage range setup. The high precision integrated 3.3 V Fixed 3.43 V or adjustable 0.9 V to 5 V reference can source up to 5 mA. Reference accuracy = +-1%, Tj=0 C to 85 C 380 mA maximum output current Constant on-time control with current sense Programmable switching frequency in PWM mode Pulse skipping mode (skip mode) at light loads Independent EN signal Latched OVP and UVP High accuracy 3.3 V reference voltage August 2014 DocID026819 Rev 1 1/4 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-ISA139V1 1 Schematic diagram Figure 1: STEVAL-ISA139V1 circuit schematic J3 J4 3.3V+ 3.3 V- J2 1 1 1 VIN- 0 - S1 (FB SEL jumper) shorted to VCC J7 J8 EXT VCC- EXT VCC+ - S2 (EN SEL jumper) shorted to VIN 0 J1 - S3 (BYP SEL jumper) shorted to OU T VIN 1 1 1 VIN+ BYP SE L C2 0 1 2 1 EXT VCC 0 BY P 2 2 3 OU T 10n ST PM6644 C3 1 10 10n S3 REF REF3 C4 1 FB 2 9BY P FB BY P 3 8VCC 1 2 33u 0 2 TON VCC FB SE L 4 7VIN 0 EN VIN 5 6 SW 1 2OU T EP 1u GND SW 1 C1 S1 10n 2M EP 2 2 2 2 R3 2 1 3 C5 C8 C7 C6 OU T 2.2u 2.2u 22u 22u 1 1 1 1 VCC VIN 0 1M R1 0 0 2 J5 EN SE L OU T 1 0 S2 J10 J9 J11 EXT VCC R4 FB SW BY P VOUT+ 1M 3 1 J6 R2 1 VIN 1 1 1 1M VOU T- 0 0 3 4 FB SW BY P EN SW1 2 1 0 GSPG2808141528SMD 2/4 DocID026819 Rev 1

Tariff Desc

8543.70.00 Other machines and apparatus Free
13 Signal processors (graphic equalisers, crossovers etc.) 91 Other Free

9027.10.00 Instruments and apparatus for physical or chemical analysis (eg, polarimeters, refractometers, spectrometers, gas or smoke analysis apparatus); instruments and apparatus for measuring or checking viscosity, porosity, expansion, surface tension or the like; instruments and apparatus for measuring or checking quantities of heat, sound or light (including exposure meters); microtomes Free

9031.80.00 MEASURING OR CHECKING INSTRUMENTS, APPLIANCES AND MACHINES, NOT SPECIFIED OR INCLUDED ELSEWHERE IN THIS CHAPTER; PROFILE PROJECTORS Other instruments, appliances and machines Free

9030.31.00 Oscilloscopes, spectrum analysers and other instruments and apparatus for measuring or checking electrical quantities, excluding meters of 9028; instruments and apparatus for measuring or detecting alpha, beta, gamma, x-ray, cosmic or other ionising radiations.
Other instruments and apparatus, for measuring or checking voltage, current, resistance or power Multimeters without a recording device Free

8473.30.00 Parts and accessories of the machines of 8471 AUTOMATIC DATA PROCESSING MACHINES AND UNITS THEREOF; MAGNETIC OR OPTICAL READERS, MACHINES FOR TRANSCRIBING DATA ONTO DATA MEDIA IN CODED FORM AND MACHINES FOR PROCESSING SUCH DATA, NOT ELSEWHERE SPECIFIED OR INCLUDED:
.Other 71 No Weighing less than 1kg Free

8537 BOARDS, PANELS, CONSOLES, DESKS, CABINETS AND OTHER BASES, EQUIPPED WITH TWO OR MORE APPARATUS OF 8535 OR 8536, FOR ELECTRIC CONTROL OR THE DISTRIBUTION OF ELECTRICITY, INCLUDING THOSE INCORPORATING INSTRUMENTS OR APPARATUS OF CHAPTER 90, AND NUMERICAL CONTROL APPARATUS, OTHER THAN SWITCHING APPARATUS OF 8517:
8538 PARTS SUITABLE FOR USE SOLELY OR PRINCIPALLY WITH THE APPARATUS OF 8535, 8536 OR 8537:
8538.10.10 22 For programmable controllers Free
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