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Texas Instruments LM5575QMHX/NOPB
- Part No.:
- LM5575QMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5575QMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,550
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Product details
Overview
LM5575QMHX/NOPB from Texas Instruments is an automotive-grade, 75V input, 1.5A synchronous step-down DC/DC 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 operates across −40°C to +125°C junction temperature - used in automotive infotainment power rails and industrial 24/48V bus converters.
For engineers reviewing the LM5575QMHX/NOPB datasheet, LM5575QMHX/NOPB pinout, LM5575QMHX/NOPB application, or LM5575QMHX/NOPB equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, 1.5% feedback reference accuracy, cycle-by-cycle current limiting, thermal shutdown at 165°C, and HTSSOP-16EP package with exposed thermal pad for high-reliability under-hood designs.
Technical Context
The LM5575QMHX/NOPB implements emulated current-mode control using a reconstructed ramp signal derived from VIN–VOUT and a diode-current sample-and-hold circuit - eliminating leading-edge spikes and enabling stable operation at ultra-low duty cycles. Its dual-mode VCC regulator maintains 7V bias supply above 9V VIN while tracking VIN below that threshold.
It supports master/slave synchronization via the SYNC pin, allows soft-start timing via external capacitor on SS, and provides pre-charge assist (PRE) and bootstrap (BST) circuitry optimized for high-side N-MOSFET gate drive in buck topologies. Protection includes cycle-by-cycle current limit (2.1A typ), thermal shutdown (165°C), and undervoltage lockout on VCC and SD pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 75V - supports direct connection to automotive battery (cold-crank tolerant), telecom -48V, and industrial 24/48V buses without pre-regulation. |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, CAN transceivers, and sensor interfaces in distributed automotive ECUs. |
| Feedback Reference | 1.225V ±1.5% - enables precise output regulation down to 1.225V and supports standard resistor-divider programming for common 3.3V/5V/12V rails. |
| Switching Frequency | 50kHz to 500kHz - adjustable via single RT resistor; higher frequencies reduce inductor size but increase switching loss; lower frequencies improve efficiency at light loads. |
| Integrated MOSFET Rds(on) | 330mΩ (typ) - reduces conduction loss and eliminates need for external high-voltage switch, simplifying BOM and layout. |
| Junction Temperature Range | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood automotive applications including engine control modules. |
| Thermal Resistance θJA | 50°C/W - achievable with standard 2-layer PCB and exposed pad soldered to thermal plane; θJC = 14°C/W confirms efficient die-to-case heat transfer. |
Pinout & Package
LM5575QMHX/NOPB is housed in a thermally enhanced HTSSOP-16EP (Exposed Pad) package. The exposed copper pad must be soldered to a PCB ground plane for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Bias regulator output | Provides internal 7V regulated supply; accepts external 7.5–14V to reduce dissipation; requires 0.1–1µF ceramic decoupling. |
| 2 SD | Shutdown/standby control | 0.7V threshold for shutdown, 1.225V for enable; internal 5µA pull-up allows open-circuit operation; supports line UVLO via external divider. |
| 3 VIN | Main input supply | Accepts 6–75V unregulated input; absolute max 76V; requires local bulk and ceramic bypass capacitors near pin. |
| 4 SYNC | Oscillator sync I/O | Enables multi-device synchronization; internal weak pull-up/strong pull-down; accepts external clock > free-running frequency. |
| 5 COMP | Error amplifier output | Connects to FB via type-II compensation network; sets loop stability and transient response; sink/source capability ≥3mA. |
| 6 FB | Feedback input | Inverting input of error amp; referenced to 1.225V; bias current ≤17nA ensures minimal divider loading. |
| 7 RT | Frequency set input | Resistor to AGND sets oscillator frequency (50–500kHz); placement critical - must be adjacent to IC pins. |
| 8 RAMP | Emulated current ramp node | External capacitor (50–2000pF) sets ramp slope; current source scales with (VIN–VOUT); enables subharmonic-free operation. |
| 9 AGND | Analog ground reference | Separate low-noise ground for control circuitry; must be star-connected to PGND at single point near IC. |
| 10 SS | Soft-start timing | 10µA internal current charges external capacitor; controls output voltage ramp rate; discharged during fault events. |
| 11 OUT | Regulated output connection | Direct connection to output filter inductor and capacitor; not a power output pin - carries full load current. |
| 12 PGND | Power ground return | Low-side reference for IS sense resistor and PRE switch; must be routed with low-inductance path to minimize noise coupling. |
| 13 IS | Diode current sense | Measures re-circulating Schottky diode anode current; internal 83mΩ sense resistor feeds sample-and-hold for DC current level. |
| 14 SW | Switching node | Source of internal N-MOSFET; connects to inductor and external Schottky diode cathode; high dv/dt node requiring tight layout. |
| 15 PRE | Bootstrap pre-charge assist | Open-drain output tied to SW; activates 250ns before each on-time to charge BST capacitor under light-load or pre-biased conditions. |
| 16 BST | Bootstrap capacitor connection | Connects to SW via 0.022µF ceramic capacitor; supplies floating gate drive for high-side N-MOSFET; internal diode charges it during off-time. |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode architecture | Eliminates current-sense spike filtering and blanking delays, enabling reliable <10% duty cycle operation in high-VIN/low-VOUT applications. |
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation with full electrical testing per automotive reliability standards - suitable for engine bay and transmission control units. |
| Integrated 75V/330mΩ N-MOSFET | Reduces external component count by eliminating discrete high-voltage switch and associated gate driver; improves power density and reliability. |
| Adjustable soft-start (SS pin) | External capacitor sets controlled output voltage ramp time - prevents inrush current, suppresses input rail sag, and avoids downstream reset glitches. |
| SYNC pin for multi-device coordination | Allows up to five LM5575Q devices to synchronize without external clock generator - reduces conducted EMI peaks and simplifies system-level noise management. |
| Pre-charge assist (PRE pin) | Ensures robust bootstrap capacitor charging during discontinuous conduction mode or when output is pre-biased - prevents gate drive failure at light loads. |
Applications
| Automotive Infotainment Power Supply | Industrial 48V Bus Converter |
|---|---|
|
Use Scenario: Powering display controllers, audio DSPs, and USB hubs in head-unit systems supplied from 12V battery with cold-crank dips to 6V. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.3V/5V from variable 6–16V input; manages startup sequencing and load transients during ignition pulses. Use Value: 1.225V reference accuracy and 1.5A output ensure stable logic rail generation despite wide input swings; AEC-Q100 qualification guarantees field reliability. |
Use Scenario: Converting telecom-grade −48V or industrial 48V distribution bus to 12V intermediate rail for PLC I/O modules and sensors. IC Role / Device Role / Timing Role: High-input-voltage step-down controller operating at 200kHz with external sync to avoid interference with communication clocks. Use Value: 75V rating eliminates need for front-end pre-regulator; emulated current mode enables stable regulation even at 25% duty cycle (12V out from 48V in). |
| Heavy-Duty Vehicle Telematics ECU | Off-Highway Equipment Control Module |
|
Use Scenario: Powering GPS receivers, cellular modems, and CAN FD interfaces in truck telematics units exposed to 24V battery with load-dump surges. IC Role / Device Role / Timing Role: Input-filtered buck stage accepting up to 75V transients; uses SD pin for controlled shutdown during ignition-off transitions. Use Value: Cycle-by-cycle current limit (2.1A) and thermal shutdown (165°C) prevent latch-up during short-circuit faults; HTSSOP-16EP package sustains high ambient temperatures. |
Use Scenario: Providing 5V/3.3V rails in construction or agricultural machinery ECUs operating in dusty, vibration-prone environments with 24V nominal supply. IC Role / Device Role / Timing Role: Main power converter with soft-start (SS) and remote shutdown (SD) for safe power sequencing during engine start-stop cycles. Use Value: Exposed pad thermal design enables operation at full 1.5A load in sealed enclosures; wide temp range ensures functionality during cold winter starts and hot summer operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5576QMHX/NOPB | Higher 2.5A output current, same 75V input, identical pinout and features - differs only in current rating and thermal design margin. | Suitable where peak load exceeds 1.5A or derating for extended life at high ambient temperature is required. | Select LM5576QMHX/NOPB if sustained >1.2A loads or >85°C ambient operation is expected; otherwise LM5575QMHX/NOPB offers optimal cost/performance balance. |
| MAX5033DESA+T | 76V input, 500mA output, SO-8 package; no SYNC, no PRE, no RAMP adjustment; fixed 125kHz frequency; lacks AEC-Q100 qualification. | Limited to low-power auxiliary rails in non-automotive industrial equipment where size and cost outweigh performance needs. | Choose MAX5033DESA+T only for space-constrained, low-current (<500mA), non-automotive applications where AEC-Q100 is unnecessary and external sync is not required. |
Compared with LM5576QMHX/NOPB, the LM5575QMHX/NOPB trades 1A output headroom for lower thermal stress and reduced BOM cost in 1.5A-limited designs; versus MAX5033DESA+T, it delivers 3× output current, automotive qualification, and advanced control features - making it the sole viable option for demanding vehicular power systems.
Availability
LM5575QMHX/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial 48V bus converters, and heavy-duty vehicle telematics requiring stable component supply with long-term lifecycle support and AEC-Q100 compliance.
Supply support for LM5575QMHX/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 leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in high-reliability power conversion ICs.
The LM5575QMHX/NOPB belongs to TI's SIMPLE SWITCHER® automotive-grade buck regulator product line, engineered specifically for robust, low-component-count DC/DC conversion in harsh environments such as engine compartments and industrial control cabinets.
FAQ
What is the maximum input voltage rating for LM5575QMHX/NOPB?
The LM5575QMHX/NOPB has an absolute maximum input voltage rating of 76V on the VIN pin. Its operational input range is specified from 6V to 75V. Exceeding 76V risks permanent damage due to internal transistor breakdown. In automotive applications, this rating accommodates load-dump transients up to ISO 7637-2 Pulse 5a (±75V), provided proper input clamping and layout practices are followed.
Does LM5575QMHX/NOPB require an external Schottky diode?
Yes, the LM5575QMHX/NOPB requires an external Schottky diode connected between the SW and OUT pins. Although it integrates a high-side N-channel MOSFET, it does not include a synchronous rectifier - the diode provides the freewheeling path during the switch off-time. TI recommends CMSH3-100 or equivalent 100V/3A Schottky diodes with low forward voltage and fast recovery for optimal efficiency.
How is the switching frequency set on LM5575QMHX/NOPB?
The switching frequency of LM5575QMHX/NOPB is set by a single resistor (RT) connected between the RT pin and AGND. Using the formula F = 1 / (135pF × RT) – 580nA, a 32.4kΩ resistor yields ~200kHz. Frequency ranges from 50kHz (RT ≈ 143kΩ) to 500kHz (RT ≈ 11kΩ). The RT resistor must be placed adjacent to the IC with short traces to minimize noise coupling and ensure accuracy.
What is the purpose of the PRE pin on LM5575QMHX/NOPB?
The PRE (pre-charge) pin on LM5575QMHX/NOPB is an open-drain output that connects to the SW node to assist bootstrap capacitor charging under light-load or pre-biased output conditions. When the inductor current falls to zero, SW may not go sufficiently negative to charge the BST capacitor via the internal diode. PRE activates a 250ns pre-charge pulse each cycle to maintain gate drive integrity - critical for stable operation in DCM or during hot-plug scenarios.
Is LM5575QMHX/NOPB pin-compatible with LM5575MHX/NOPB?
Yes, LM5575QMHX/NOPB is pin-compatible with LM5575MHX/NOPB. Both use the identical HTSSOP-16EP package and share identical pin functions, electrical characteristics, and application circuitry. The "Q" suffix denotes AEC-Q100 Grade 1 qualification (−40°C to +125°C), while the standard LM5575MHX/NOPB is rated for −40°C to +125°C but lacks automotive qualification testing. Layout and bill-of-materials can be reused interchangeably.
LM5575QMHX/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM5575QMHX/NOPB FAQ
1.How can I place an order for LM5575QMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5575QMHX/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 LM5575QMHX/NOPB reliable?
The price and inventory of LM5575QMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5575QMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5575QMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5575QMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5575QMHX/NOPB?
LM5575QMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5575QMHX/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 LM5575QMHX/NOPB?
For technical support, including LM5575QMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5575QMHX/NOPB requirements.
6.How does Aetrix verify that LM5575QMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5575QMHX/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 LM5575QMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5575QMHX/NOPB?
All LM5575QMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5575QMHX/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 LM5575QMHX/NOPB part is unused and in its original packaging.
Return procedure for LM5575QMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM5575QMHX/NOPB Tags
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