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The L7987 device is a step-down monolithic switching regulator able to deliver up to 3 A DC. The output voltage adjustability ranges from 0.8 V to VIN. The wide input voltage range and the 100% duty cycle capability meet the fail safe specifications for industrial systems. The embedded switchover feature on the VBIASpin maximizes the efficiency at light load. The adjustable current limitation, designed to select the inductor RMS current accordingly with the nominal output current, and the high switching frequency capability make the size of the application compact. Pulse-by-pulse current sensing with digital frequency foldback implements an effective constant current protection over the different application conditions. The peak current foldback decreases the stress of the power components in heavy short-circuit condition. The PGOOD open collector output can also implement output voltage sequencing during the power-up phase. Multiple devices can be synchronized sharing the SYNCH pin to prevent beating noise in low noise applications like sensors with A/D conversion.
Key Features
- 3 A DC output current
- 4.5 V to 61 V operating input voltage
- RDS,ON= 250 mΩ typ.
- Adjustable fSW(250 kHz - 1.5 MHz)
- Low IQ-SHD (11 μA typ. from VIN)
- Low IQ (1 mA typ. - VIN24 V - VOUT3.3 V)
- Output voltage adjustable from 0.8 V to VIN
- Synchronization
- Adjustable soft-start time
- Adjustable current limitation
- Low dropout operation (12 μs max.)
- VBIASimproves efficiency at light load
- PGOOD open collector output
- Output voltage sequencing
- Digital frequency foldback in short-circuit
- Peak current foldback in short-circuit
- Auto-recovery thermal shutdown
Featured Videos
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Product Specifications (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 02 Apr 2015 |
02 Apr 2015
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Technical Notes & Articles (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 29 Oct 2015 |
29 Oct 2015
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Flyers (2)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 30 Jun 2020 |
30 Jun 2020
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| 29 Sep 2020 |
29 Sep 2020
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Brochures (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 23 Mar 2020 |
23 Mar 2020
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CAD/EDA Symbols, Footprints and Models
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HW Model, CAD Libraries & SVD (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| ZIP | 02 Nov 2017 |
02 Nov 2017
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| L7987 |
Active
|
HTSSOP16 | Industrial | Ecopack2 |
|
| L7987TR |
Active
|
HTSSOP16 | Industrial | Ecopack2 |
|
L7987
Package:
HTSSOP16Material Declaration**:
L7987TR
Package:
HTSSOP16Material Declaration**:
(**) 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.
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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 | |||||||||||
| L7987TR | 3 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | HTSSOP16 | - | - | PHILIPPINES | 1.25 / 1k | |
| L7987 | 5 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tube | HTSSOP16 | - | - | PHILIPPINES | 1.25 / 1k | |
(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors
