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Texas Instruments LMR70503TM/NOPB
- Part No.:
- LMR70503TM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFBGA, DSBGA
- Datasheet:
-
LMR70503TM/NOPB.pdf
- Description:
- IC REG BUCK BST ADJ 270MA 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,732
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Product details
Overview
LMR70503TM/NOPB from Texas Instruments is a monolithic buck-boost DC-DC converter IC designed to generate adjustable negative output voltages from a positive input supply. It delivers up to 320 mA switch current, operates across 2.8 V to 5.5 V input, supports −0.9 V to −5.5 V output, integrates internal MOSFET and soft-start, and targets space-constrained bias rail generation in precision analog systems.
For engineers reviewing the LMR70503TM/NOPB datasheet, LMR70503TM/NOPB pinout, LMR70503TM/NOPB application, or LMR70503TM/NOPB equivalent, key selection criteria include its ground-referred enable input, no-external-compensation architecture, minimum 500 kHz switching frequency, −5.5 V absolute maximum VOUT-to-GND rating, and 0.84 mm × 1.615 mm thin DSBGA package footprint.
Technical Context
The LMR70503TM/NOPB employs peak current mode control with a fixed minimum switching frequency of 500 kHz to avoid audible noise, dynamically adjusting peak inductor current-not frequency-to maintain regulation at light loads. Its internal dummy load engages when output voltage overshoots due to minimum on-time (70 ns) limitations, discharging excess capacitor charge.
Control logic references all signals-including EN and FB-to GND (not VOUT), simplifying system-level sequencing. UVLO (2.55 V rise, 0.13 V hysteresis) and thermal shutdown (165 °C trip, 10 °C hysteresis) are integrated, and the device requires no external compensation thanks to built-in stability optimization for standard ceramic output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8 V to 5.5 V - Enables direct use from single Li-ion, USB, or 3.3 V/5 V rails without pre-regulation. |
| Output Voltage Range | −0.9 V to −5.5 V - Programmable via resistor divider on FB/VREF; supports op-amp dual-rail and LCD biasing. |
| Switch Current Limit | 320 mA (typ) - Sets maximum deliverable load current under heavy-load CCM operation. |
| Min Switching Frequency | 500 kHz (typ) - Prevents audible noise and ensures EMI remains above sensitive audio bands. |
| Reference Voltage | 1.19 V (typ) - Stable internal bandgap reference used by FB comparator for output regulation accuracy. |
| Shutdown Current | 1 µA (max) - Enables ultra-low-power system standby states without external disconnect circuitry. |
| Package Dimensions | 0.84 mm × 1.615 mm × 0.6 mm - Ultra-compact 8-bump thin DSBGA enables <1.4 mm² PCB area usage. |
Pinout & Package
Tiny 8-bump thin DSBGA package (0.84 mm × 1.615 mm × 0.6 mm), bottom-side solder bumps, diamond-marked A1 location. Thermal pad not present; GND pins provide primary thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | VREF | 1.19 V reference output; connects to bottom resistor (RB) of feedback divider for output voltage setting. |
| B1 | EN | Ground-referenced active-high enable; must be driven only when VIN is valid (2.8–5.5 V); no level-shifting needed. |
| C1, C2 | GND | Analog ground return for internal bias circuits; must be low-impedance connection to system ground plane. |
| D1 | SW | Switch node; connects to cathode of external Schottky diode and inductor; high dv/dt node requiring tight layout. |
| A2 | FB | Feedback input; compares divided VOUT to VREF; connects to junction of RT (VREF–FB) and RB (VOUT–FB). |
| B2 | VOUT | Negative output terminal; connects to anode of Schottky diode and output capacitor(s); referenced to GND. |
| D2 | VIN | Positive input supply; powers internal circuitry and high-side MOSFET; requires ≥10 µF ceramic input capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Integrated loop compensation eliminates need for external RC networks-reduces BOM count and layout sensitivity. |
| Ground-referred enable input | EN pin referenced to GND-not VOUT-enables direct interfacing with standard logic-level microcontrollers or PMICs. |
| Internal soft start & soft off | Gradual output ramp-up avoids inrush current; internal discharge FET pulls VOUT to GND during shutdown regardless of load. |
| Minimum 500 kHz switching frequency | Fixed lower bound prevents frequency droop into audible range (<20 kHz), simplifying EMI filtering and shielding design. |
| Adjustable negative output | Output set from −0.9 V to −5.5 V using two resistors-supports wide range of analog signal chain bias requirements. |
Applications
| Op-Amp Dual-Rail Bias | LCD Panel Bias Supply |
|---|---|
|
Use Scenario: Generating symmetric ±2.5 V or ±5 V supplies for rail-to-rail op-amps in portable instrumentation. IC Role / Device Role / Timing Role: Negative voltage generator; replaces discrete charge-pump or transformer-based solutions. Use Value: Eliminates need for external compensation or timing components while maintaining <1% output regulation over 1–100 mA load range. |
Use Scenario: Providing stable −3.3 V or −5.0 V gate drive voltage for TFT-LCD source driver ICs. IC Role / Device Role / Timing Role: Compact negative rail generator; interfaces directly with 3.3 V system power domain. Use Value: Achieves <±2% output accuracy across −40°C to +125°C with <10 mVpp ripple at 50 mA load. |
| Data Converter Reference Bias | Low-Noise Sensor Signal Conditioning |
|
Use Scenario: Supplying clean −2.5 V reference bias to SAR ADCs and DACs in medical sensor front-ends. IC Role / Device Role / Timing Role: Low-noise negative supply; leverages internal soft-start to prevent reference settling disturbance. Use Value: Delivers <30 µV RMS output noise (10 Hz–100 kHz) and <0.5% line/load regulation-critical for 16-bit+ resolution. |
Use Scenario: Powering JFET-input op-amps and transimpedance amplifiers in photodiode or MEMS sensor interfaces. IC Role / Device Role / Timing Role: Precision negative rail source; uses ground-referenced EN for synchronized power-up with analog signal chain. Use Value: Maintains <1.5 mV output drift over temperature and supports fast transient recovery (<10 µs to 1% regulation) after 10 mA step load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative-output buck-boost applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS60403DBVR | Charge-pump topology; fixed −3.3 V output; no inductor required; max 60 mA output. | Suitable only for ultra-low-current biasing where efficiency >85% is acceptable and inductors are prohibited. | Select when board space is extreme and load ≤40 mA; avoid if >100 mA or adjustable VOUT needed. |
| LT3582EMSE#TRPBF | Current-mode buck-boost; −5 V fixed or adjustable; 400 mA switch limit; requires external compensation. | Supports higher current and wider input range (2.7–25 V), but needs compensation network and larger layout. | Choose for industrial environments needing >125°C operation or higher VIN tolerance; accept added design complexity. |
Compared with TPS60403DBVR and LT3582EMSE#TRPBF, the LMR70503TM/NOPB uniquely balances ultra-small size, no-compensation simplicity, and 320 mA capability in a ground-referenced enable architecture-making it optimal for portable analog subsystems where PCB area and ease-of-use are critical.
Availability
LMR70503TM/NOPB is available at Aetrix Electronics and suitable for op-amp biasing, LCD panel supplies, and data converter reference rails requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LMR70503TM/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 decades of expertise in high-efficiency DC-DC conversion.
The LMR70503TM/NOPB belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use, minimal external component count, and rapid deployment in space-constrained analog and mixed-signal applications.
FAQ
What is the absolute maximum VOUT-to-GND voltage rating for the LMR70503TM/NOPB?
The LMR70503TM/NOPB has an absolute maximum VOUT-to-GND rating of −6.5 V. This defines the upper limit of negative voltage stress the device can withstand without damage. Operation beyond this value-even momentarily-risks permanent failure. The recommended operating range remains −0.9 V to −5.5 V per datasheet specifications. Always verify external diode and capacitor voltage ratings exceed −6.5 V in worst-case fault conditions.
Does the LMR70503TM/NOPB require external compensation components?
No, the LMR70503TM/NOPB does not require external compensation components. Its internal control loop is factory-optimized for stability with standard ceramic output capacitors (≥22 µF). This eliminates the need for external RC networks on the FB pin or elsewhere-reducing BOM cost, PCB area, and design iteration time. Layout best practices (short FB trace, proper grounding) remain essential for consistent performance.
How does the enable (EN) pin interface with standard logic levels?
The EN pin of the LMR70503TM/NOPB is ground-referenced, meaning its threshold (1.05–1.2 V rising) aligns directly with common 1.8 V or 3.3 V GPIO outputs. No level-shifter is needed. However, EN must never exceed VIN-so driving EN from a 5 V MCU while VIN = 3.3 V violates absolute maximum ratings. Use a resistor divider from VIN to EN if external logic exceeds VIN.
What is the purpose of the internal dummy load in the LMR70503TM/NOPB?
The internal dummy load in the LMR70503TM/NOPB activates only at near-zero load currents to absorb excess energy when the minimum on-time (70 ns) prevents further reduction of peak inductor current. It senses FB node voltage offset and sinks proportional current-preventing output voltage overshoot and maintaining regulation without lowering switching frequency into the audible range. It automatically disables above ~5 mA load.
Can the LMR70503TM/NOPB be used with a 2.5 V input supply?
No-the LMR70503TM/NOPB requires a minimum input voltage of 2.8 V per its absolute maximum and operating ratings. At 2.5 V, the device will not start due to UVLO (rising threshold = 2.55 V), and sustained operation below 2.8 V risks malfunction or unregulated output. For 2.5 V input systems, consider alternative regulators such as the TPS60400 or LTC3260 with lower VIN capability.
LMR70503TM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -0.9V
- Voltage - Output (Max):
- -5.5V
- Current - Output:
- 270mA (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DSBGA
LMR70503TM/NOPB FAQ
1.How can I place an order for LMR70503TM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR70503TM/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 LMR70503TM/NOPB reliable?
The price and inventory of LMR70503TM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR70503TM/NOPB is usually 5 days.
3.What payment methods are accepted for LMR70503TM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR70503TM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR70503TM/NOPB?
LMR70503TM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR70503TM/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 LMR70503TM/NOPB?
For technical support, including LMR70503TM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR70503TM/NOPB requirements.
6.How does Aetrix verify that LMR70503TM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR70503TM/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 LMR70503TM/NOPB meets industry standards.
7.What is the process for return or replacement of LMR70503TM/NOPB?
All LMR70503TM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR70503TM/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 LMR70503TM/NOPB part is unused and in its original packaging.
Return procedure for LMR70503TM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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