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Texas Instruments LM25117-Q1
Wide Input Range Synchronous Buck Controller with Analog Current Monitor
Overview
| Topology | Buck Converter |
| Input voltage | 15-55 V |
| Switching frequency | 50-750 kHz |
| Output 1 | 12 V / 9 A |
| IC revision | F |
Description
The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by- cycle current limiting and ease of loop compensation.The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.The operating frequency is programmable from 50kHz to 750 kHz. The LM25117 drives external high- side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator that allows external bias supply further improves efficiency. The LM25117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line under-voltage lockout.
Features
- LM25117Q is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified (-40°C to +125°C Operating Junction Temperature)
- Emulated Peak Current Mode Control
- Wide Operating Range from 4.5V to 42V
- Robust 3.3A Peak Gate Drives
- Adaptive Dead-time Output Driver Control
- Free-run or Synchronizable Clock up to 750kHz
- Optional Diode Emulation Mode
- Programmable Output from 0.8V
- Precision 1.5% Voltage Reference
- Analog Current Monitor
- Programmable Current Limit
- Hiccup Mode Over Current Protection
- Programmable Soft-start and Tracking
- Programmable Line Under-voltage Lockout
- Programmable Switch-over to External Bias Supply
- Thermal Shutdown
- Available Package: HTSSOP-20 (Thermally Enhanced), WQFN-24 (4mm×4mm)
Typical applications
- Step-down regulator applications
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 74435561100 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCI SMT Flat Wire High Current Inductor | 10 | 16.5 | 10 | 21.5 | 6.9 | 14 | WE-PERM 2 |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 74435561100 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Samples |
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