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Texas Instruments LM5575MH
- Part No.:
- LM5575MH
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5575MH.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,019
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Product details
Overview
LM5575MH from Texas Instruments is a 75V-input, 1.5A synchronous step-down DC/DC switching regulator with integrated 330mΩ N-channel MOSFET, emulated current-mode control, and adjustable 50–500kHz switching frequency. It delivers regulated output down to 1.225V and supports automotive-grade operation (−40°C to +125°C) in HTSSOP-16EP packaging. Used in high-voltage industrial power supplies and telecom bus converters.
For engineers reviewing the LM5575MH datasheet, LM5575MH pinout, LM5575MH application, or LM5575MH equivalent, key selection considerations include its 75V input capability, cycle-by-cycle current limiting, soft-start programmability, and SYNC pin for multi-regulator synchronization - all critical for robust high-voltage buck design.
Technical Context
The LM5575MH implements emulated current-mode control using a reconstructed ramp signal derived from VIN–VOUT and an internal diode-current sample-and-hold circuit. This eliminates leading-edge spikes and enables stable operation at very low duty cycles required for high-input/low-output voltage ratios.
Its dual-mode VCC regulator maintains ~7V bias supply above 9V VIN while tracking VIN below that threshold; the exposed-pad HTSSOP-16EP package achieves θJC = 14°C/W for thermal management under continuous 1.5A load. Protection includes thermal shutdown at 165°C, cycle-by-cycle current limit (2.1A typ), and remote shutdown via SD pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 75V - supports direct connection to 48V telecom, 24V industrial, and 12V automotive buses without pre-regulation. |
| Output Current | 1.5A continuous - sufficient for powering FPGAs, DSPs, or multiple downstream LDOs in embedded systems. |
| Feedback Reference | 1.225V ±1.5% - enables precise output regulation with minimal external resistor tolerance impact. |
| Switching Frequency | 50kHz to 500kHz (resistor-programmable) - allows trade-off between inductor size (higher fSW) and conduction loss (lower fSW). |
| Integrated MOSFET Rds(on) | 330mΩ (typ) - reduces external component count and improves efficiency at mid-load conditions. |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents latch-up during overload or poor heatsinking while enabling automatic recovery. |
| Soft-Start Current | 10µA (typ) - sets controlled ramp rate for output voltage rise when paired with external SS capacitor. |
Pinout & Package
LM5575MH is housed in a thermally enhanced HTSSOP-16EP package with exposed die attach pad (EP), requiring PCB-level thermal vias to ground plane for optimal junction temperature control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 6–75V unregulated input; absolute max 76V - requires local 10µF+ ceramic bypass near pin. |
| VCC | Bias regulator output | Supplies internal logic and gate driver; self-regulates to ~7V above 9V VIN; accepts auxiliary 7.5–14V supply to reduce dissipation. |
| SW | Switch node | Drives external Schottky diode and buck inductor; connects to BST capacitor; voltage swings from −0.5V to VIN. |
| BST | Bootstrap supply | Connects via 0.022µF ceramic to SW; charges during off-time to enable high-side N-MOSFET gate drive. |
| FB | Feedback input | Inverting input of error amplifier; regulates output by comparing divider voltage to 1.225V reference. |
| COMP | Error amplifier output | Provides access to loop compensation network (typically Type II) between COMP and FB pins. |
| RT | Oscillator set | Resistor-to-AGND sets frequency (50–500kHz); value calculated per TI equation: RT = (1/F − 580ns)/135pF. |
| RAMP | Emulated current ramp | External capacitor (50–2000pF) sets slope; current source scales with (VIN − VOUT) for accurate current reconstruction. |
| SD | Shutdown control | Three-state interface: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active; internal 5µA pull-up if floating. |
| SYNC | Frequency sync I/O | Open-drain input/output; allows master-slave synchronization of multiple LM5575MH units or external clock locking. |
| SS | Soft-start timing | 10µA current source charges external capacitor; voltage ramps reference to control startup slew rate. |
| IS | Diode current sense | Connects to Schottky anode; internal 83mΩ sense resistor enables accurate DC level sampling for emulated ramp. |
| PRE | Pre-charge assist | Open-drain output tied to SW; activates 250ns before on-time to recharge BST capacitor under light/no-load conditions. |
| AGND / PGND | Analog & power ground | Separate AGND (error amp reference) and PGND (switch return) minimize noise coupling; both connect to EP. |
| OUT | Regulated output | Direct connection point for output capacitor; senses output voltage via FB divider; not a power output pin. |
Key Features
| Feature | Design Value |
|---|---|
| 75V integrated N-MOSFET | Eliminates need for external high-voltage switch and associated gate drive complexity in buck topologies. |
| Emulated current-mode control | Removes requirement for current-sense resistor and avoids noise-sensitive high-side sensing in high-dV/dt environments. |
| Adjustable soft-start | Enables controlled output voltage ramp-up to prevent inrush current into large output capacitors or downstream loads. |
| Master/slave SYNC capability | Reduces EMI by enabling phase-aligned switching across multiple rails without external clock generators. |
| Thermal and overcurrent protection | Ensures safe operation under fault conditions including short-circuit, overload, and inadequate heatsinking. |
| Automotive-grade qualification | Meets AEC-Q100 Grade 1 requirements (−40°C to +125°C), supporting deployment in engine control and ADAS modules. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24V or 48V factory bus to 3.3V/5V for PLC I/O, sensors, and communication interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, efficient, and EMI-controlled DC/DC conversion. Use Value: 75V input rating accommodates line transients up to 76V; HTSSOP-16EP package enables compact layout with thermal vias to inner ground layers. |
Use Scenario: Regulating battery-supplied 12V nominal (6–16V range) to 5V for microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: High-reliability buck converter meeting automotive temperature and transient immunity requirements. Use Value: AEC-Q100 Grade 1 qualification ensures operation at 125°C junction; SD pin enables controlled power sequencing with vehicle ignition signals. |
| Telecom 48V Bus Converter | Test Equipment Power Rail |
|
Use Scenario: Stepping down −48V or +48V telecom rack voltage to 12V/15V for fan controllers, monitoring circuits, and interface ICs. IC Role / Device Role / Timing Role: Input-capable buck regulator handling wide VIN range and reverse-polarity protected inputs. Use Value: 6–75V input range covers both standard +48V and legacy −48V systems with proper polarity configuration; SYNC pin enables synchronized multi-rail operation. |
Use Scenario: Providing stable, low-noise 3.3V/5V rails in benchtop instruments where output accuracy and transient response are critical. IC Role / Device Role / Timing Role: Precision-adjustable buck regulator with 1.225V reference and wide bandwidth error amplifier. Use Value: 1.5% feedback reference accuracy and 3MHz unity-gain bandwidth support tight regulation under dynamic load steps typical in test equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5576MH | Same pinout and architecture but rated for 100V input (vs. 75V); higher Rds(on) 450mΩ; identical 1.5A current limit. | Required only when input may exceed 75V (e.g., 96V battery systems); otherwise over-spec'd for 48V/24V use cases. | Select LM5576MH only if system-level transients or future voltage scaling demand >75V absolute maximum rating. |
| LM25011MK/NOPB | 65V max input, 1A output, SO-8 package; uses traditional current-sense resistor instead of IS pin; no SYNC or PRE features. | Suitable for cost-sensitive, lower-current designs where thermal performance and multi-device synchronization are not required. | Choose LM25011MK/NOPB for simpler, lower-power applications where HTSSOP-16EP thermal advantages and advanced features are unnecessary. |
Compared with LM5575MH, LM5576MH extends input voltage headroom at the expense of slightly lower efficiency, while LM25011MK/NOPB trades integration and thermal capability for smaller footprint and lower BOM cost - making LM5575MH the optimal balance of voltage range, current capability, and feature set for demanding 1.5A industrial/automotive buck designs.
Availability
LM5575MH is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC power supplies, and telecom 48V bus converters requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM5575MH includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM5575MH belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC/DC regulators, designed specifically for engineers needing robust, high-input-voltage buck solutions with minimal external components and built-in protection.
FAQ
What is the maximum input voltage rating for the LM5575MH?
The LM5575MH has an absolute maximum input voltage rating of 76V, with guaranteed operation across 6V to 75V. Exceeding 76V risks permanent damage due to internal transistor breakdown. In practice, designs should maintain ≥1V margin below 76V - especially during line transients - using appropriate input clamping or filtering. The LM5575MH datasheet specifies this limit in Section 6.1 Absolute Maximum Ratings.
Does the LM5575MH require an external current-sense resistor?
No, the LM5575MH does not require an external current-sense resistor. It uses an internal 83mΩ sense element connected to the IS pin for diode-current sampling, combined with an emulated ramp generator referenced to VIN and VOUT. This architecture replaces traditional high-side MOSFET current sensing, reducing component count and noise susceptibility while maintaining accurate cycle-by-cycle current limiting at 2.1A.
How is the switching frequency set on the LM5575MH?
The LM5575MH switching frequency is set by a single resistor (RT) connected between the RT pin and AGND. Its value determines frequency from 50kHz to 500kHz per the formula: RT = (1/F − 580 ns) / 135 pF. For example, RT = 32.4kΩ yields ~200kHz. The RT resistor must be placed close to the IC with short traces to minimize noise coupling and ensure stable oscillator operation as specified in the LM5575MH datasheet Section 8.2.1.
Can the LM5575MH synchronize to an external clock signal?
Yes, the LM5575MH can synchronize to an external clock via its SYNC pin, which functions as an open-drain input/output. An external clock source (e.g., MCU timer or dedicated oscillator) with pulse width ≥15ns and frequency higher than the LM5575MH's free-running frequency can drive the SYNC line low to reset the internal oscillator ramp. Multiple LM5575MH units can also self-synchronize by connecting their SYNC pins together, with the highest-frequency unit acting as master - detailed in Figure 12 and Section 8.3.4 of the LM5575MH datasheet.
What thermal management is required for the LM5575MH at full 1.5A load?
At 1.5A continuous output, the LM5575MH requires thermal vias under the exposed pad (EP) connected to a solid internal ground plane to achieve θJA ≤ 50°C/W. With 4–6 thermal vias (0.3mm diameter, filled), copper area ≥ 200mm², and ambient ≤ 60°C, junction temperature stays within the −40°C to +125°C operating range. The device triggers thermal shutdown at 165°C (with 25°C hysteresis), so PCB layout must prioritize heat spreading - as validated in TI's LM5575MH evaluation module (EVM) design guidelines.
LM5575MH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 70V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 50kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM5575MH FAQ
1.How can I place an order for LM5575MH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5575MH on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM5575MH reliable?
The price and inventory of LM5575MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5575MH is usually 5 days.
3.What payment methods are accepted for LM5575MH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5575MH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5575MH?
LM5575MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5575MH order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM5575MH?
For technical support, including LM5575MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5575MH requirements.
6.How does Aetrix verify that LM5575MH is sourced from the original manufacturer or authorized distributors?
All LM5575MH products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM5575MH meets industry standards.
7.What is the process for return or replacement of LM5575MH?
All LM5575MH units undergo pre-shipment inspection (PSI). If there is an issue with LM5575MH, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM5575MH part is unused and in its original packaging.
Return procedure for LM5575MH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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