Product overview
Description
The L6983I is a device specifically designed for isolated buck topology. The primary output voltage can be accurately adjusted, whereas the isolated secondary output is derived by using a given transformer ratio. No optocoupler is required. The primary sink capability up to -4.5 A (even during soft-start) allows a proper energy transfer to the secondary side as well as enabling a tracked soft-start of the secondary output. The control loop is based on a peak current mode architecture and the device operates in forced PWM. The 390 ns blanking time filters oscillations, generated by the transformer leakage inductance, making the solution more robust.
The compact QFN16 3x3 mm package and the internal compensation of the L6983I help minimize design complexity and size.
The switching frequency can be programmed in the 200 kHz - 1 MHz range with optional spread spectrum for improved EMC. The EN pin provides enable/disable functionality.
The typical shutdown current is 2 μA when disabled. As soon as the EN pin is pulled up the device is enabled and the internal 1.3 ms soft-start takes place. The L6983I features Power Good open collector that monitors the FB voltage. Pulse by pulse current sensing on both power elements implements an effective constant current protection and thermal shutdown prevents thermal run-away.
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All features
- Designed for iso-buck topology
- 3.5 V to 38 V operating input voltage
- Primary output voltage regulation / no optocoupler required
- 4.5 A source / sink peak primary current capability
- Peak current mode architecture in forced PWM operation
- 390 ns blanking time
- 200 kHz to 1 MHz programmable switching frequency. Stable with low ESR capacitor: min 2 µF
- Internal compensation network
- 2 μA shutdown current
- Internal soft-start
- Enable
- Overvoltage protection
- Output voltage sequencing
- Thermal protection
- Optional spread spectrum for improved EMC
- Power Good
- Synchronization to external clock
- QFN16 (3x3 mm) package
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STMicroelectronics - L6983I
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| L6983IQTR | Active | QFPN 3X3X0.80 16L PITCH 0.50 | Industrial | Ecopack3 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
| Part Number | Order from distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| L6983IQTR | distributors No availability of distributors reported, please contact our sales office | Active | EAR99 | NEC | Tape and Reel | QFPN 3X3X0.80 16L PITCH 0.50 | - | - | CHINA | | ||
L6983IQTR Active
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors