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Texas Instruments LM2738YMY/NOPB
- Part No.:
- LM2738YMY/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerTSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2738YMY/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,752
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Product details
Overview
LM2738YMY/NOPB from Texas Instruments is a monolithic 550-kHz, 1.5-A synchronous step-down DC-DC switching regulator in an 8-pin WSON (3.0 mm × 3.0 mm) package with PowerPAD™ thermal enhancement. It integrates a 250-mΩ NMOS switch, internal soft-start, current-mode PWM control, and 0.8-V ±2% reference for precise output regulation across 0.8–18 V. Used in space-constrained point-of-load applications like USB-powered devices and set-top boxes.
For engineers reviewing the LM2738YMY/NOPB datasheet, LM2738YMY/NOPB pinout, LM2738YMY/NOPB application, or LM2738YMY/NOPB equivalent, key selection criteria include verified 550-kHz fixed-frequency operation, 400-nA shutdown current, 3–20-V input range, thermal shutdown at 165°C, and confirmed compatibility with ceramic output capacitors and Schottky catch diodes.
Technical Context
The LM2738YMY/NOPB implements constant-frequency current-mode PWM control with internal compensation, enabling stable regulation without external loop components. Its architecture includes cycle-by-cycle current limiting (2.9 A typical), undervoltage lockout (2.7 V rising threshold), and output overvoltage protection triggered at FB = 1.16×VREF.
Operation relies on bootstrap gate drive: BOOST–SW must be maintained between 2.5 V and 5.5 V to fully enhance the internal NMOS switch. The device supports three BOOST sourcing configurations-direct from VIN, from VOUT, or via Zener-clamped rail-and features dedicated EN pin logic control with 400-nA shutdown quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550 kHz fixed - enables use of small 2.2-µH inductors and 22-µF ceramic output capacitors without compromising transient response. |
| Output Current | 1.5 A continuous - supports local power delivery for FPGA I/O banks or microcontroller cores without external current boosting. |
| Input Voltage Range | 3 V to 20 V - accommodates 5-V, 12-V, and wide-input industrial rails while maintaining regulation down to 3 V. |
| Feedback Reference | 0.8 V ±2% - sets output voltage via external resistor divider; enables accurate 1.5-V, 3.3-V, or 5-V generation with <±1% total error including line/load regulation. |
| Shutdown Current | 400 nA - allows battery-backed systems to retain >95% charge over 1 year when LM2738YMY/NOPB is disabled. |
| RDS(ON) | 250 mΩ typical - limits conduction loss to ≤225 mW at 1.5-A load, supporting >90% peak efficiency at 12-VIN/3.3-VOUT. |
| Thermal Shutdown | 165°C junction - protects against sustained overload or poor PCB thermal design; auto-recovery occurs at ~150°C. |
Pinout & Package
LM2738YMY/NOPB uses an 8-pin WSON package (NGQ) with 3.0 mm × 3.0 mm body and exposed thermal pad (DAP) soldered to PCB ground for enhanced thermal performance. Package thermal resistance: RθJA = 45.9°C/W (JEDEC 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap supply input | Drives NMOS gate during high-side conduction; requires 0.1-µF X7R capacitor to SW; voltage must exceed SW by 2.5–5.5 V. |
| 2,3 - VIN / VCC | Power input & bias supply | Tied together externally; supplies power stage and internal regulator; bypass with ≥10-µF ceramic capacitor near pins. |
| 4 - EN | Enable control | Logic-high (>1.4 V) enables regulation; logic-low (<0.4 V) disables switch and reduces IQ to 400 nA; must not float or exceed VIN + 0.3 V. |
| 5,7 - GND | Signal & power ground | Return path for feedback divider and power stage; connect bottom resistor of R1/R2 divider directly to these pins for accuracy. |
| 6 - FB | Voltage feedback input | Monitors output via resistive divider; internal 0.8-V reference compares against FB to adjust duty cycle; bias current <100 nA. |
| 8 - SW | Switch node output | Connects to inductor and catch diode anode; swings from ≈VIN (on) to ≈–0.3 V (off); drives external bootstrap capacitor during off-time. |
| DAP | Thermal pad | Internally connected to GND; must be soldered to large PCB copper area for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft-start | Ramps reference from 0 V to 0.8 V over ~600 µs, limiting in-rush current during startup and preventing output overshoot. |
| Current-mode PWM control | Enables fast transient response and inherent cycle-by-cycle current limiting without external slope compensation. |
| Output overvoltage protection | Disables switch if FB exceeds 0.928 V (16% above 0.8-V reference), protecting downstream loads from fault conditions. |
| Undervoltage lockout | Prevents operation until VIN rises above 2.7 V (typical), with 400-mV hysteresis to avoid chatter during brownout recovery. |
| Thermal shutdown with hysteresis | Shuts down at 165°C junction; resumes operation only after cooling to ~150°C, preventing thermal runaway in enclosed environments. |
Applications
| USB-Powered Devices | Set-Top Boxes |
|---|---|
Use Scenario: Powering HDMI interface ICs and tuners from 5-V USB-C or wall adapters with tight board area constraints. IC Role / Device Role: Primary 3.3-V/1.5-A point-of-load regulator replacing discrete buck controllers and MOSFETs. Use Value: Enables single-chip solution with 90% efficiency at full load and <1-mm profile using 2.2-µH inductor and 22-µF ceramic output cap. | Use Scenario: Generating core voltage for MPEG decoder SoCs and memory interfaces in consumer STB platforms. IC Role / Device Role: Local DC-DC converter delivering stable 1.2-V or 1.5-V at up to 1.5 A from 12-V main rail. Use Value: Internal compensation eliminates need for external compensation network; 550-kHz frequency avoids AM radio band interference. |
| HDD Core Power | Battery-Powered Instruments |
Use Scenario: Supplying 1.8-V or 2.5-V to HDD controller ASICs in portable external storage enclosures. IC Role / Device Role: High-efficiency buck regulator operating from single-cell Li-ion (3.0–4.2 V) or dual-cell (6–8.4 V) battery inputs. Use Value: 400-nA shutdown current extends battery life; 3-V minimum input supports deep discharge operation down to 3.0 V. | Use Scenario: Powering precision analog front-ends and low-power MCUs in handheld test equipment with 9-V alkaline or Li-SOCl₂ batteries. IC Role / Device Role: Main system regulator converting 9-V input to 3.3-V logic rail with tight load regulation under dynamic sensor sampling. Use Value: Current-mode control delivers <100-µs transient response to 500-mA load steps; 0.8-V reference ensures <±1% output accuracy across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2738XMY/NOPB | 1.6-MHz switching frequency vs. 550 kHz; higher switching losses but smaller passive components. | Better suited for ultra-compact designs where inductor size dominates board area, less optimal for noise-sensitive audio circuits. | Select LM2738XMY/NOPB only when footprint reduction justifies efficiency trade-off and EMI filtering complexity. |
| TPS5430DDAR | 3-A output capability, wider 5.5–36-V input range, external compensation, no integrated BOOT diode requirement. | Targeted at higher-power industrial supplies; lacks internal soft-start and OVP; requires additional layout effort for stability. | Choose TPS5430DDAR when >1.5-A load or >20-V input is required; LM2738YMY/NOPB remains preferred for cost- and size-optimized 1.5-A designs. |
Compared with LM2738XMY/NOPB, LM2738YMY/NOPB offers lower EMI and higher light-load efficiency due to its 550-kHz frequency, while TPS5430DDAR provides greater output current and input voltage headroom at the expense of component count and design complexity.
Availability
LM2738YMY/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, set-top boxes, HDD core power, battery-powered instruments, and DSL modems requiring stable component supply and long-term production continuity.
Supply support for LM2738YMY/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 ICs, embedded processors, and power management solutions for industrial, automotive, and consumer markets.
The LM2738YMY/NOPB belongs to TI's high-frequency DC-DC converter product line, engineered specifically for compact, efficient point-of-load regulation in space-constrained consumer and computing applications.
FAQ
What is the switching frequency of the LM2738YMY/NOPB?
The LM2738YMY/NOPB operates at a fixed 550-kHz switching frequency. This value is factory-trimmed and does not require external programming. It enables use of small surface-mount inductors (e.g., 2.2 µH) and ceramic output capacitors while maintaining high efficiency and avoiding AM-band interference. Frequency tolerance is ±20% over temperature and line variations per datasheet Section 6.5.
Does the LM2738YMY/NOPB require an external bootstrap diode?
No, the LM2738YMY/NOPB does not require an external bootstrap diode. Its internal architecture uses the BOOST pin to charge an external bootstrap capacitor (CBOOST) directly from VIN or VOUT, eliminating the need for a discrete diode. The datasheet Figure 26 shows a direct connection from VIN to BOOST through CBOOST, confirming diode-free operation in standard configurations.
What is the maximum output voltage achievable with the LM2738YMY/NOPB?
The LM2738YMY/NOPB supports an output voltage range of 0.8 V to 18 V, set by an external resistor divider on the FB pin. With the internal 0.8-V reference, a 18-V output requires R1/R2 = 21.5 (e.g., R1 = 215 kΩ, R2 = 10 kΩ). The upper limit is constrained by the 20-V maximum VIN rating and stability considerations at high duty cycles; operation above 15 V requires careful attention to minimum on-time limitations.
How does the enable pin (EN) function on the LM2738YMY/NOPB?
The EN pin on the LM2738YMY/NOPB controls device operation: a logic-high voltage ≥1.4 V enables regulation, while a logic-low voltage ≤0.4 V places the device in shutdown mode with 400-nA quiescent current. The pin must never float or exceed VIN + 0.3 V. Internal pull-down ensures safe default-off behavior if left unconnected, but TI recommends active driving for reliable control in noisy environments.
Can the LM2738YMY/NOPB drive a 1.5-A load continuously at 12-V input and 3.3-V output?
Yes, the LM2738YMY/NOPB is rated for 1.5-A continuous output current under recommended operating conditions. At VIN = 12 V and VOUT = 3.3 V, typical efficiency exceeds 90% (per Figure 4), resulting in <350 mW power dissipation. With proper PCB layout-including thermal pad soldering to ≥2 cm² of 2-oz copper-the junction temperature stays below 125°C at room ambient, satisfying continuous operation requirements.
LM2738YMY/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerTSSOP, 8-MSOP (0.118", 3.00mm 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):
- 3V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-HVSSOP
LM2738YMY/NOPB FAQ
1.How can I place an order for LM2738YMY/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2738YMY/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 LM2738YMY/NOPB reliable?
The price and inventory of LM2738YMY/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2738YMY/NOPB is usually 5 days.
3.What payment methods are accepted for LM2738YMY/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2738YMY/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2738YMY/NOPB?
LM2738YMY/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2738YMY/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 LM2738YMY/NOPB?
For technical support, including LM2738YMY/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2738YMY/NOPB requirements.
6.How does Aetrix verify that LM2738YMY/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2738YMY/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 LM2738YMY/NOPB meets industry standards.
7.What is the process for return or replacement of LM2738YMY/NOPB?
All LM2738YMY/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2738YMY/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 LM2738YMY/NOPB part is unused and in its original packaging.
Return procedure for LM2738YMY/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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