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Texas Instruments LM5575MHX/NOPB
- Part No.:
- LM5575MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5575MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,244
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Product details
Overview
LM5575MHX/NOPB 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 stable output down to 1.225V and supports automotive-grade operation (−40°C to +125°C) in HTSSOP-16EP package. Used in telecom power supplies and industrial bus converters.
For engineers reviewing the LM5575MHX/NOPB datasheet, LM5575MHX/NOPB pinout, LM5575MHX/NOPB application, or LM5575MHX/NOPB equivalent, key selection considerations include its 75V max input rating, cycle-by-cycle current limiting at 2.1A typical, BST/SW bootstrap architecture, SYNC capability for multi-regulator synchronization, and thermal shutdown at 165°C.
Technical Context
The LM5575MHX/NOPB implements emulated current-mode control using a reconstructed ramp signal derived from VIN–VOUT and an internal diode-current sample-and-hold circuit - eliminating leading-edge spikes and enabling reliable sub-100ns minimum on-time. Its dual-mode VCC regulator maintains ~7V bias supply above 9V VIN while tracking VIN below that threshold.
It features programmable oscillator frequency via RT-to-AGND resistor, master/slave SYNC capability with 11kΩ source impedance and 110Ω sink impedance, and dedicated IS pin for re-circulating diode current sensing. Protection includes thermal shutdown (165°C), cycle-by-cycle current limit (2.1A typ), and remote shutdown via SD pin with 0.7V/1.225V thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 75V - supports wide industrial and automotive bus voltages without external pre-regulation. |
| Output Current | 1.5A continuous - sufficient for powering FPGAs, microcontrollers, and analog subsystems from high-voltage rails. |
| Feedback Reference | 1.225V ±1.5% - enables precise output regulation down to 1.225V with external resistor divider. |
| Switch RDS(on) | 330mΩ typical - reduces conduction loss and improves efficiency at high load currents. |
| Switching Frequency | 50kHz to 500kHz - adjustable via single RT resistor; higher frequencies reduce inductor size but increase switching loss. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Soft-Start Current | 10µA typical - controls rise time of external SS capacitor to limit inrush current during startup. |
Pinout & Package
Package: HTSSOP-16EP (Exposed Pad), thermally enhanced surface-mount package with exposed die attach pad soldered to PCB ground plane for improved thermal dissipation (θJA = 50°C/W, θJC = 14°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 6–75V unregulated input; absolute max 76V - requires local ceramic bypassing and transient protection. |
| VCC | Bias regulator output | Supplies internal logic and gate driver; regulated to ~7V above 9V VIN; 0.1–1µF decoupling required. |
| SW | Switch node | Connects to buck inductor and Schottky diode cathode; high dv/dt node requiring tight layout and low-inductance routing. |
| BST | Bootstrap capacitor connection | Requires 0.022µF ceramic cap to SW; enables high-side N-MOSFET gate drive via charge pump. |
| FB | Feedback input | Inverting input of error amplifier; referenced to 1.225V - sets output voltage via external resistor divider. |
| COMP | Error amplifier output | Connects to FB via type-II compensation network; determines loop stability and transient response. |
| RT | Oscillator frequency set | Resistor to AGND sets switching frequency (50–500kHz); value must be placed close to IC pins. |
| RAMP | Emulated current ramp control | External capacitor to AGND sets ramp slope; critical for current-mode stability and slope compensation. |
| SD | Shutdown control | Logic-level enable: <0.7V = shutdown, >1.225V = active; internal 5µA pull-up allows open-circuit operation. |
| IS | Diode current sense | Measures re-circulating diode anode current for DC level reconstruction in emulated current mode. |
| SYNC | Frequency synchronization I/O | Allows multiple LM5575 devices to synchronize; internal weak pull-up / strong pull-down enables master/slave configuration. |
| SS | Soft-start timing | 10µA current source charges external capacitor; discharge occurs during fault conditions (UVLO, thermal shutdown). |
| PRE | Bootstrap pre-charge assist | Open-drain output tied to SW; activates 250ns before switch-on to recharge BST capacitor under light-load or pre-biased conditions. |
| AGND | Analog ground reference | Reference for FB, COMP, RAMP, RT - must be separated from PGND to avoid noise coupling into control loop. |
| PGND | Power ground return | Low-side return for switch and IS sense path; connects to power stage ground plane and sense resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode architecture | Eliminates current-sense spike filtering and blanking delays, enabling stable operation at very small duty cycles (<5%) in high-VIN applications. |
| Integrated 75V/330mΩ N-MOSFET | Reduces external component count and PCB area; eliminates need for discrete high-voltage switch and associated gate driver. |
| Adjustable soft-start (SS pin) | Prevents output overshoot and inrush current by linearly ramping error amplifier reference; restarts automatically after fault recovery. |
| Master/slave SYNC capability | Enables EMI reduction and phase interleaving across multiple regulators without external clock generator - up to five devices synchronized. |
| Dual-level shutdown (SD pin) | Supports both full shutdown (<0.7V) and standby mode (0.7–1.225V), allowing partial system power management with retained VCC bias. |
| Pre-charge assist (PRE pin) | Mitigates bootstrap capacitor undercharge in discontinuous conduction mode or pre-biased output scenarios, ensuring reliable gate drive. |
Applications
| Telecom Power Supply | Industrial Bus Converter |
|---|---|
Use Scenario: Converting −48V telecom battery backup rail to 3.3V/5V for line cards and interface ICs. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.5A at 3.3V with 75V input tolerance and robust transient handling. Use Value: Eliminates need for intermediate pre-regulation stages; 1.225V reference enables accurate low-voltage outputs; thermal shutdown prevents failure during prolonged overloads. | Use Scenario: Stepping down 24V/48V factory automation bus to 12V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with adjustable frequency to avoid noise-sensitive bands (e.g., 100–200kHz). Use Value: SYNC pin allows coordination with other power rails to minimize conducted EMI; HTSSOP-16EP package supports high-power density on compact PCBs. |
| Automotive Infotainment | Test Equipment Power |
Use Scenario: Regulating 12V/24V vehicle battery (with load dump transients) to 5V for display controllers and audio codecs. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified buck controller supporting −40°C to +125°C junction temperature. Use Value: 75V input rating withstands ISO 7637-2 pulse 5a (load dump); SD pin enables ignition-controlled enable/disable sequencing. | Use Scenario: Providing stable 15V/1.5A output from variable lab supply (18–72V) for DUT power in automated test systems. IC Role / Device Role / Timing Role: Programmable-frequency regulator with remote shutdown and soft-start for repeatable power cycling. Use Value: RT resistor adjustment enables optimization for lowest ripple or highest efficiency; SS pin supports controlled ramp-up during test initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5576MHX/NOPB | Same family, 3A output rating; identical pinout and feature set except higher current capability and 500mΩ switch RDS(on). | Required where >1.5A continuous load exists; same PCB layout usable if thermal design accommodates higher power dissipation. | Select LM5576MHX/NOPB when output current demand exceeds 1.5A; verify thermal margin with θJA = 50°C/W and 3A load. |
| LMR50410RVEA | 40V max input, 1A output, 1.5MHz fixed frequency; smaller WSON-10 package; no SYNC or RAMP pins; integrated compensation. | Suitable only for lower-input-voltage, space-constrained applications; lacks emulated current-mode flexibility and high-VIN robustness. | Choose LMR50410RVEA only for cost-optimized, low-power designs with VIN ≤ 40V and no requirement for frequency synchronization or custom loop compensation. |
Compared with LM5576MHX/NOPB, the LM5575MHX/NOPB offers lower conduction loss at 1.5A loads due to its 330mΩ switch, while the LMR50410RVEA trades high-voltage capability and design flexibility for integration and footprint reduction - making it unsuitable for 75V bus applications or designs requiring EMI-controlled frequency tuning.
Availability
LM5575MHX/NOPB is available at Aetrix Electronics and suitable for telecom power supplies, industrial bus converters, and automotive infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM5575MHX/NOPB 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 company headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and digital signal processing technologies since 1930.
The LM5575MHX/NOPB belongs to TI's SIMPLE SWITCHER® portfolio - engineered specifically for high-input-voltage DC/DC conversion in harsh environments where reliability, wide VIN range, and minimal external components are critical.
FAQ
What is the maximum input voltage rating for the LM5575MHX/NOPB?
The LM5575MHX/NOPB has an absolute maximum input voltage rating of 76V, with recommended continuous operation from 6V to 75V. Exceeding 76V may cause permanent damage. Input transient protection is strongly advised in automotive and industrial applications where load dump or inductive kickback can occur. The LM5575MHX/NOPB's internal VCC regulator also limits bias supply to ~7V above 9V VIN, enhancing reliability at high input voltages.
How does the LM5575MHX/NOPB implement emulated current-mode control?
The LM5575MHX/NOPB reconstructs the inductor current ramp without direct high-side sensing: it combines a sample-and-hold DC level from IS-pin diode current measurement with an emulated ramp generated by an internal current source (IRAMP = (10µA × (VIN – VOUT)) + 50µA) charging an external RAMP-to-AGND capacitor. This eliminates noise sensitivity and propagation delay issues inherent in traditional current-mode controllers - a core feature of the LM5575MHX/NOPB architecture.
Can the LM5575MHX/NOPB be synchronized to an external clock?
Yes, the LM5575MHX/NOPB supports external clock synchronization via its SYNC pin, which accepts open-drain clock signals with pulse width ≥15ns and frequency higher than the free-running oscillator set by the RT resistor. Multiple LM5575MHX/NOPB devices can also self-synchronize by connecting their SYNC pins - the highest-frequency device acts as master. This capability is documented in the LM5575MHX/NOPB datasheet Figure 11 and Figure 12.
What is the purpose of the PRE pin on the LM5575MHX/NOPB?
The PRE pin on the LM5575MHX/NOPB provides bootstrap capacitor pre-charge assistance during light-load or pre-biased output conditions. When SW fails to go sufficiently negative during off-time (e.g., in discontinuous conduction mode), the internal 250ns pre-charge MOSFET connects PRE to PGND, pulling SW low to recharge the BST capacitor. This ensures reliable gate drive for the internal N-MOSFET - a unique feature of the LM5575MHX/NOPB not found in most competing regulators.
Does the LM5575MHX/NOPB require external compensation components?
Yes, the LM5575MHX/NOPB requires external compensation components connected between COMP and FB pins - typically a type-II network (resistor + capacitor + series RC) - to stabilize the control loop. The error amplifier's 70dB DC gain and 3MHz unity-gain bandwidth necessitate careful compensation based on output capacitance, inductance, and load conditions. No internal compensation is provided; all loop tuning is performed externally per the LM5575MHX/NOPB application guidelines.
LM5575MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LM5575MHX/NOPB FAQ
1.How can I place an order for LM5575MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5575MHX/NOPB 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 LM5575MHX/NOPB reliable?
The price and inventory of LM5575MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5575MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5575MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5575MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5575MHX/NOPB?
LM5575MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5575MHX/NOPB 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 LM5575MHX/NOPB?
For technical support, including LM5575MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5575MHX/NOPB requirements.
6.How does Aetrix verify that LM5575MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5575MHX/NOPB 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 LM5575MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5575MHX/NOPB?
All LM5575MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5575MHX/NOPB, 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 LM5575MHX/NOPB part is unused and in its original packaging.
Return procedure for LM5575MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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