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Texas Instruments LM5005MH
- Part No.:
- LM5005MH
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5005MH.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,285
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Product details
Overview
LM5005MH from Texas Instruments is a high-voltage, current-mode synchronous buck controller IC integrating a 75V/160mΩ N-channel MOSFET, delivering up to 2.5A output current across 7V–75V input range with adjustable output as low as 1.225V; used in telecom power supplies and industrial DC-DC conversion where wide VIN and fast transient response are required.
For engineers reviewing the LM5005MH datasheet, LM5005MH pinout, LM5005MH application, or LM5005MH equivalent, key selection criteria include verified 80ns minimum on-time, emulated peak current-mode control architecture, EN55022/CISPR 22 EMI compliance, thermal shutdown with 25°C hysteresis, and HTSSOP-20 package with exposed pad for thermal management.
Technical Context
The LM5005MH implements emulated peak current-mode control using a sample-and-hold DC level derived from freewheeling diode current (via IS pins) and an externally programmable voltage-controlled ramp (RAMP pin + CRAMP capacitor), eliminating leading-edge spikes and enabling reliable sub-100ns pulse-width control at high VIN/VOUT ratios.
Its dual-mode VCC regulator delivers 7V regulated bias up to 75V VIN while supporting auxiliary VCC input (7.5V–14V) to reduce internal dissipation; oscillator frequency is resistor-programmable (50kHz–500kHz) with bidirectional SYNC capability for multi-regulator synchronization and EMI reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7V to 75V - supports direct connection to 24V, 48V, and 72V industrial/telecom bus rails without pre-regulation. |
| Max Output Current | 2.5A - sustained continuous load capability with integrated 160mΩ MOSFET and thermally enhanced HTSSOP package. |
| Feedback Reference | 1.225V ±1.5% - enables precise output regulation down to 1.225V with external resistor divider scaling. |
| Min PWM On-Time | 80ns - ensures stable operation at high input-to-output voltage ratios (e.g., 75V→3.3V) without pulse skipping. |
| Switching Frequency | 50kHz to 500kHz - set by single RT resistor; allows optimization of efficiency vs. size trade-offs in magnetics design. |
| Junction Temp Range | –40°C to +125°C - qualified for extended industrial and telecom environments with thermal shutdown at 165°C. |
| EMI Compliance | Meets EN55022 Class B / CISPR 22 - achieved via synchronized switching, controlled slew rates, and layout-optimized HTSSOP package. |
Pinout & Package
LM5005MH is housed in a thermally enhanced 20-pin HTSSOP (PWP) package with exposed pad soldered to PCB ground plane, achieving 1.2°C/W junction-to-board thermal resistance (RθJC(bot)) and enabling high-power density designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (3,4) | Main power input | Accepts 7V–75V unregulated supply; dual pins reduce trace inductance and improve high-current handling. |
| SW (17,18) | Switching node | Drain of internal buck MOSFET; connects directly to inductor and freewheeling diode cathode. |
| PGND (13,14) | Power ground return | Low-side reference for MOSFET source, IS sense resistor, and bootstrap circuit; separate from AGND. |
| FB (7) | Feedback input | Inverting input of error amplifier; referenced to 1.225V internal bandgap; requires external resistive divider. |
| COMP (6) | Error amplifier output | Connects to FB via type-II compensation network (RC + C) to stabilize loop with emulated current ramp. |
| RT (8) | Oscillator frequency set | Resistor-to-ground sets switching frequency from 50kHz to 500kHz; critical for EMI and magnetics sizing. |
| RAMP (9) | Emulated current ramp input | External capacitor (50pF–2nF) to AGND sets slope; enables noise-immune current-mode control without sensing spikes. |
| IS (15,16) | Diode current sense | Connects to freewheeling diode anode; provides DC level for emulated ramp via internal 42mΩ sense resistor. |
| SD (2) | Shutdown/standby control | Three-state logic: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active; includes 5µA pullup if open. |
| BST (20) | Bootstrap supply | Connects to SW via 22nF ceramic capacitor; powers high-side gate driver during MOSFET conduction. |
| PRE (19) | Precharge assist | Open-drain output tied to SW; injects 250ns pulses to boost BST capacitor charge under light-load/prebias conditions. |
| SYNC (5) | Oscillator sync I/O | Allows master-slave synchronization of multiple LM5005MH units or external clock locking; sink impedance 110Ω. |
| VCC (1) | Bias supply output | 7V regulated output (up to 25mA); tracks VIN below 9V; supports auxiliary 7.5–14V input to reduce IC dissipation. |
| AGND (10) | Analog ground reference | Reference for FB, COMP, RAMP, SS, and internal references; must be star-connected to minimize noise coupling. |
| SS (11) | Soft-start control | 10µA current source charges external capacitor; enables monotonic start-up into prebiased outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Emulated peak current-mode control | Eliminates need for current-sense resistor and RC filtering; enables clean 80ns min-on-time and robust noise immunity in high-VIN apps. |
| Integrated 75V/160mΩ buck MOSFET | Reduces BOM count and layout complexity; rated for 2.5A continuous output with thermal derating above 85°C. |
| Monotonic start-up into prebiased output | Prevents reverse current flow during power-up when output is already charged; essential for hot-swap and redundant systems. |
| Configurable soft-start with tracking | External CSS capacitor sets ramp rate; supports output voltage tracking in multi-rail systems via SS pin coupling. |
| Thermal shutdown with hysteresis | Triggers at 165°C junction temperature and recovers automatically after 25°C cooldown; prevents thermal runaway in enclosed enclosures. |
| Controller/peripheral frequency synchronization | Enables deterministic phase alignment across multiple regulators to suppress beat frequencies and simplify EMI filter design. |
Applications
| Telecom Power Supply | Industrial PLC Power Rail |
|---|---|
|
Use Scenario: Step-down from 48V telecom battery backup rail to 3.3V/5V logic and interface rails in base station equipment. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, high-efficiency point-of-load conversion with fast line/load transient response. Use Value: 80ns min-on-time enables stable 3.3V output from 48V input; EN55022 compliance eliminates need for external EMI filters. |
Use Scenario: Generating 12V and 24V auxiliary rails from 72V factory automation bus in programmable logic controllers. IC Role / Device Role / Timing Role: High-voltage buck controller managing multiple output stages with synchronized switching to reduce conducted emissions. Use Value: Dual-mode VCC regulator supports full 7V–75V range without external bias; HTSSOP exposed pad sustains 2.5A at 85°C ambient. |
| Automotive Test Equipment | Remote Radio Unit (RRU) |
|
Use Scenario: Powering FPGA and ADC subsystems in portable automotive diagnostic tools powered from 24V vehicle battery. IC Role / Device Role / Timing Role: Robust buck converter with UVLO hysteresis and remote shutdown for safe operation during engine cranking transients. Use Value: Programmable SD threshold (via resistor divider) ensures dropout only below 18V; thermal shutdown protects against enclosure overheating. |
Use Scenario: Converting 24V/48V distributed power to 5V/12V for RF front-end ICs and digital control in outdoor wireless infrastructure. IC Role / Device Role / Timing Role: EMI-optimized buck regulator operating in temperature-cycled outdoor enclosures with minimal heatsinking. Use Value: SYNC pin enables interleaving with other converters to lower ripple current; RAMP+IS architecture maintains stability across –40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164MHX/NOPB | 4.5V–100V input, 1.5A max, integrated 100mΩ FET, fixed 400kHz freq, no SYNC or RAMP pin. | Lacks emulated current ramp and external frequency programming; better suited for cost-sensitive, fixed-frequency apps. | Select LM5164MHX/NOPB when board space is constrained and 1.5A output suffices; avoid when <100ns on-time or EMI synchronization is required. |
| MAX17574ATP+ | 4.5V–60V input, 2.5A, current-mode control with real current sense, 100kHz–2.2MHz freq, no precharge assist. | Uses shunt-based current sensing (higher loss), lacks PRE pin and monotonic start-up; requires external bootstrap diode. | Choose MAX17574ATP+ for higher-frequency designs (>500kHz) or when real current monitoring is needed; not drop-in for LM5005MH layouts. |
Compared with LM5005MH, LM5164MHX/NOPB offers wider VIN but lower current and no RAMP/IS flexibility, while MAX17574ATP+ enables higher switching frequencies but adds component count and lacks precharge support for light-load efficiency.
Availability
LM5005MH is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and automotive test equipment requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for LM5005MH 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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM5005MH belongs to TI's high-voltage DC-DC regulator product line, engineered specifically for industrial and telecom applications demanding wide input range, integrated FETs, and robust EMI performance without external complexity.
FAQ
What is the absolute maximum input voltage rating for the LM5005MH?
The LM5005MH has an absolute maximum VIN-to-GND rating of 76V per the datasheet Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. The recommended operating range remains 7V to 75V, and careful attention to input transient suppression (e.g., TVS clamping, low-ESR bulk capacitors near VIN/PGND) is required in 72V bus applications to prevent overshoot beyond 76V.
Does the LM5005MH require an external bootstrap diode?
No, the LM5005MH does not require an external bootstrap diode. It integrates an internal bootstrap diode between VCC and BST, allowing direct connection of a 22nF ceramic capacitor from BST to SW. This simplifies layout and improves reliability compared to controllers requiring external diodes, especially in high-reliability telecom and industrial applications where component count reduction matters.
How is the switching frequency programmed on the LM5005MH?
The LM5005MH switching frequency is set by a single resistor (RT) connected between the RT pin and AGND. Using Equation 1 from the datasheet - RT(kΩ) = 7407/(FSW(kHz) − 4.3) - designers select RT to achieve frequencies from 50kHz to 500kHz. For example, a 32.4kΩ resistor yields ~200kHz. RT must be placed close to the IC with short traces to minimize noise coupling and ensure stable oscillator operation.
Can the LM5005MH start up into a precharged output?
Yes, the LM5005MH supports monotonic start-up into a prebiased output. Its soft-start circuit holds the COMP pin low until the SS capacitor charges, preventing reverse current flow through the output inductor or freewheeling diode. This feature is confirmed in the Functional Description section and is critical for hot-swap, redundant power, and multi-rail sequencing applications where output voltage may be present before enable.
What thermal performance can be expected from the LM5005MH in a standard 2-layer PCB layout?
In a standard 2-layer PCB with the LM5005MH's exposed pad soldered to a 1-in² copper pour connected to inner ground planes, the junction-to-board thermal resistance (RθJB) is 15.5°C/W. At 2.5A output and 48V input, typical power dissipation is ~2.1W; this yields ~32°C junction-to-ambient rise above board temperature - well within the –40°C to +125°C operating range, assuming board temperature stays below 93°C.
LM5005MH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-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):
- 7V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 70V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 50kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM5005MH FAQ
1.How can I place an order for LM5005MH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5005MH 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 LM5005MH reliable?
The price and inventory of LM5005MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5005MH is usually 5 days.
3.What payment methods are accepted for LM5005MH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5005MH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5005MH?
LM5005MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5005MH 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 LM5005MH?
For technical support, including LM5005MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5005MH requirements.
6.How does Aetrix verify that LM5005MH is sourced from the original manufacturer or authorized distributors?
All LM5005MH 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 LM5005MH meets industry standards.
7.What is the process for return or replacement of LM5005MH?
All LM5005MH units undergo pre-shipment inspection (PSI). If there is an issue with LM5005MH, 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 LM5005MH part is unused and in its original packaging.
Return procedure for LM5005MH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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