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Texas Instruments LM5122-Q1
LM5122/-Q1 Wide-Input Synchronous Boost Controller With Multiple Phase Capability
Overview
| Topology | Boost Converter |
| Input voltage | 9-20 V |
| Switching frequency | 400-975 kHz |
| Output 1 | 24 V / 4.5 A |
| Output 2 | 28 V / 7 A |
| IC revision | G |
Description
The LM5122 is a multiphase capable synchronous boost controller intended for high-efficiency synchronous boost regulator applications. The controlmethod is based upon peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation.
The switching frequency is programmable up to 1MHz. Higher efficiency is achieved by two robust Nchannel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode also enables discontinuous mode operation for improved efficiency at light load conditions.
An internal charge pump allows 100% duty cycle for high-side synchronous switch (Bypass operation). A 180º phase shifted clock output enables easy multi-phase interleaved configuration. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.
Features
- AEC-Q100 Grade 1 (TA = –40°C to 125°C)
- Maximum Input Voltage : 65 V
- Min Input Voltage : 3.0 V (4.5 V for startup)
- Output Voltage up to 100 V
- Bypass (VOUT = VIN) Operation
- 1.2 V Reference with ±1.0% Accuracy
- Free-Run/Synchronizable Switching to 1 MHz
- Peak Current Mode Control
- Robust 3 A Integrated Gate Drivers
- Adaptive Dead-Time Control
- Optional Diode Emulation Mode
- Programmable Cycle-by-Cycle Current Limit
- Hiccup Mode Overload Protection
- Programmable Line UVLO
- Programmable Soft-Start
- Thermal Shutdown Protection
- Low Shutdown Quiescent Current: 9 µA
- Programmable Slope Compensation
- Programmable Skip Cycle Mode Reduces Standby Power
- Allows External VCC Supply
- Inductor DCR Current Sensing Capability
- Multiphase Capability
- Thermally Enhanced 20-Pin HTSSOP
Remarks:1)fSW2 Switching frequency 2 is choosed due to max value
2)From Figure 38. Non-Isolated Synchronous Flyback Converter Simplified SchematicOnly I/O is given, but it's a coupled inductor(transformer)
Typical applications
- High Current Boost Power Supply
- 12 V, 24 V, and 48 V Power Systems
- Automotive Start-Stop
- Audio Power Supply
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | H (mm) | Fl (mm) | Packaging | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 885012207025 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSGP MLCCs 10 V(DC) | 4.7 µF | ±10% | 10 | 0805 | -55 °C up to +125 °C | 10 | 0.02 GΩ | X7R Class II | 2 | 1.25 | 1.25 | 0.5 | 7" Tape & Reel | – | – | – | – | – | – | – | ||
 | 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 | – | – | – | 1890 | -40 °C up to +150 °C | – | – | – | 18.3 | 18.2 | 8.9 | – | – | 10 | 16.5 | 10 | 21.5 | 6.9 | 14 | WE-PERM 2 |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 885012207025 | SPEC | |
| 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 | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | H (mm) | Fl (mm) | Packaging | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Samples |
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