My Inquiry
My Account
Texas Instruments LM2695MH
- Part No.:
- LM2695MH
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2695MH.pdf
- Description:
- IC REG BUCK ADJ 1.25A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,613
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2695MH from Texas Instruments is a high-voltage, 30V-input, 1.25A valley-current-mode synchronous buck regulator IC with integrated 33V N-channel MOSFET switch, hysteretic control architecture, and no loop compensation required. It operates from 8V to 30V input, delivers adjustable output down to 2.5V via resistor divider feedback, and targets non-isolated telecom post-regulation and high-efficiency point-of-load applications.
For engineers reviewing the LM2695MH datasheet, LM2695MH pinout, LM2695MH application, or LM2695MH equivalent, key selection criteria include its fixed 2.5V internal reference, 12.3 µA softstart current source, 1.25A valley current limit, 250 ns minimum off-time, and thermal shutdown at 175°C - all critical for stable high-voltage DC-DC conversion in industrial and telecom power supplies.
Technical Context
The LM2695MH implements a hysteretic on-time control scheme where switching frequency remains stable across line and load variations due to inverse VIN–tON relationship. Its regulation relies on comparing FB voltage to a precision 2.5V internal reference, while overvoltage protection triggers at 2.9V to terminate on-time immediately.
Current limiting occurs during off-time by sensing recirculating current through the ISEN–SGND path with 130 mΩ internal sense resistance; thermal shutdown activates at 175°C with 20°C hysteresis, and gate drive UVLO ensures BST–SW ≥ 3.0V for reliable MOSFET turn-on.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 30V - supports wide-range industrial and telecom inputs without external pre-regulation |
| Output Current Limit | 1.25A valley current - sets maximum sustainable load before cycle-by-cycle current limiting engages |
| Feedback Reference | 2.5V ±1.2% - enables precise output voltage setting via R1/R2 divider with <100 nA bias current |
| Softstart Current | 12.3 µA - charges external SS capacitor linearly to control output ramp rate and suppress inrush |
| Minimum Off-Time | 250 ns - guarantees sufficient bootstrap capacitor recharge time and limits max duty cycle at low VIN |
| Thermal Shutdown | 175°C activation, 155°C recovery - provides fail-safe protection against sustained overload or poor heatsinking |
| VCC Startup Regulator | 7.0V ±0.4V, 9.7 mA current limit - powers internal circuitry directly from VIN, reducing need for auxiliary bias supply |
Pinout & Package
LM2695MH is packaged in a thermally enhanced 14-pin HTSSOP (PWP) with exposed thermal pad, optimized for high-power density and PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply connection | Accepts 8V–30V; powers startup regulator and gate driver; transient-rated to 33V |
| SW | Switching node | Connects to inductor, freewheeling diode, and bootstrap capacitor; carries high di/dt current |
| BST | Bootstrap supply for high-side gate drive | Requires 0.022 µF ceramic cap to SW; charged via internal diode during off-time |
| ISEN | Current sense output | Sinks recirculating current; used with SGND to set 1.25A valley current limit |
| SGND | Sense ground return | Provides dedicated low-impedance return path for current-sense resistor; separate from RTN |
| RTN | Circuit ground reference | Ground for internal logic, comparators, and regulation circuitry; not shared with current sense |
| FB | Feedback input | Compares output voltage (via R1/R2) to 2.5V reference; <100 nA input bias ensures accuracy |
| SS | Softstart control | Internal 12.3 µA current source ramps voltage to 2.5V; grounded during UVLO or thermal shutdown |
| RON/SD | On-time programming & shutdown | Resistor from VIN sets tON; grounding disables regulator and resets softstart |
| VCC | Startup regulator output | Nominally 7.0V; can be externally biased (8V–14V) to reduce internal dissipation |
| NC | No connection | Pins 1, 7, 8, 14 - unconnected internally; must remain floating or tied to ground per layout guidelines |
| EP | Exposed thermal pad | Internally connected to substrate; must be soldered to PCB ground plane with multiple vias for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates external compensation components and enables ultra-fast load transient response without stability tuning |
| Integrated 33V N-channel buck switch | Reduces BOM count and layout complexity; supports up to 2A peak and 1.5A average switch current |
| No loop compensation required | Enables single-layer PCB designs and eliminates risk of phase-margin miscalculation in high-noise environments |
| Adjustable output voltage | Set via external R1/R2 divider; regulated to 2.5V reference with ±1.2% tolerance over temperature and line |
| Valley current limit at 1.25A | Provides accurate, temperature-stable overcurrent protection that activates during off-time for consistent trip threshold |
| Thermally enhanced HTSSOP-14 package | θJA = 37°C/W (0 LFPM); exposed pad improves thermal reliability in high-ambient industrial deployments |
Applications
| Telecom Secondary Post-Regulator | Industrial Point-of-Load Supply |
|---|---|
Use Scenario: Regulating 48V telecom bus down to 3.3V/5V for line-card ASICs and FPGAs in base station equipment. IC Role / Device Role / Timing Role: Primary non-isolated buck converter providing stable, high-efficiency local power with fast transient response to burst-mode traffic loads. Use Value: 1.25A current limit and 250 ns minimum off-time ensure robust operation under sudden load steps common in packet-switched systems. | Use Scenario: Powering microcontrollers and sensors in factory automation controllers operating from 24V DC rails. IC Role / Device Role / Timing Role: High-voltage step-down regulator delivering 3.3V or 5V with minimal external components and no compensation network. Use Value: Hysteretic control and 2.5V reference enable stable regulation despite wide input variation (24V ±20%) and ambient temperature swings. |
| High-Voltage LED Driver Bias | Test Equipment Auxiliary Rail |
Use Scenario: Generating constant-current bias for high-brightness LED arrays powered from 24V or 36V industrial supplies. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator supplying stable voltage to external LED current controller ICs. Use Value: Adjustable output and 30V max input allow direct use with unregulated rectified supplies, reducing system-level filtering requirements. | Use Scenario: Providing clean, low-noise 12V auxiliary rail for analog front-end circuitry in portable test instruments. IC Role / Device Role / Timing Role: Secondary buck regulator isolating sensitive analog sections from noisy digital power domains. Use Value: Exposed thermal pad and low bias current (<1 µA shutdown) support compact, fanless enclosure designs with long battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2695S | Same die, WSON-10 package (4 mm × 4 mm); higher θJA (45°C/W), no exposed pad pins | Preferred for space-constrained layouts where thermal pad soldering is impractical | Select LM2695S when board area is limited and thermal load is moderate; LM2695MH offers superior thermal performance in high-power designs |
| TPS54202D | 4.5V–28V input, 2A current limit, current-mode control with external compensation; 6-pin SOT-23 | Lower voltage range and smaller package suit consumer-grade embedded systems, not high-voltage industrial rails | Choose TPS54202D only if input stays below 28V and 2A peak current suffices; LM2695MH supports higher VIN and integrates more functions |
Compared with LM2695S, the LM2695MH provides lower thermal resistance and proven reliability in continuous 1.25A industrial loads; versus TPS54202D, it delivers higher input voltage capability and eliminates compensation design effort - making LM2695MH optimal for ruggedized 24V/48V infrastructure power.
Availability
LM2695MH is available at Aetrix Electronics and suitable for telecom secondary regulation, industrial point-of-load conversion, high-voltage LED biasing, and test equipment auxiliary rails requiring stable component supply and long-term manufacturability.
Supply support for LM2695MH 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 broad industrial and automotive design-in expertise.
The LM2695 product line delivers high-voltage, high-current buck regulators for demanding infrastructure applications where input transients, thermal stress, and layout simplicity are critical design constraints.
FAQ
What is the maximum input voltage rating for the LM2695MH?
The LM2695MH has an absolute maximum VIN-to-RTN rating of 33V, with recommended continuous operation from 8V to 30V. This 30V upper limit ensures reliable performance under steady-state conditions while accommodating transient spikes up to 33V without damage, making it suitable for 24V and 48V industrial and telecom systems where input rail overshoot is common.
How does the LM2695MH achieve stable output without external compensation components?
The LM2695MH uses a hysteretic on-time control architecture that compares FB voltage to a 2.5V internal reference and initiates fixed-duration on-times inversely proportional to VIN. This eliminates the need for external compensation networks, avoids phase-margin instability risks, and delivers ultra-fast transient response - a core design feature confirmed in the SNVS413A datasheet's Functional Description section.
Can the LM2695MH operate with an external bias applied to the VCC pin?
Yes, the LM2695MH supports external biasing of the VCC pin with 8V–14V to disable the internal startup regulator and reduce power dissipation. When externally biased, the internal 7.0V regulator shuts off, and VCC is sourced solely from the external supply. The sum of external VCC and VIN must not exceed 47V, and the internal diode between VCC and VIN remains active per the Absolute Maximum Ratings table.
What is the purpose of the ISEN and SGND pins on the LM2695MH?
The ISEN and SGND pins form a dedicated current-sensing path for valley current limiting. Recirculating inductor current flows from SGND through an internal 130 mΩ resistor and out of ISEN into the freewheeling diode. This arrangement enables accurate 1.25A current limit detection during off-time - independent of RTN noise - ensuring consistent trip thresholds across temperature and load conditions.
Does the LM2695MH require a minimum output capacitor ESR for stable operation?
Yes, the LM2695MH requires ≥25 mVp-p ripple voltage at the FB pin for proper hysteretic regulation. This ripple is generated by inductor current flowing through the combined ESR of output capacitor C2 and optional series resistor R3. If C2's ESR is insufficient, R3 must be added - typically <1 Ω - to meet the 25 mV minimum, as explicitly specified in the Applications Information section of the SNVS413A datasheet.
LM2695MH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-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):
- 8V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 1.25A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM2695MH FAQ
1.How can I place an order for LM2695MH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2695MH 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 LM2695MH reliable?
The price and inventory of LM2695MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2695MH is usually 5 days.
3.What payment methods are accepted for LM2695MH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2695MH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2695MH?
LM2695MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2695MH 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 LM2695MH?
For technical support, including LM2695MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2695MH requirements.
6.How does Aetrix verify that LM2695MH is sourced from the original manufacturer or authorized distributors?
All LM2695MH 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 LM2695MH meets industry standards.
7.What is the process for return or replacement of LM2695MH?
All LM2695MH units undergo pre-shipment inspection (PSI). If there is an issue with LM2695MH, 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 LM2695MH part is unused and in its original packaging.
Return procedure for LM2695MH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2695MH Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
