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Texas Instruments LM3370TLX-3806/NOPB
- Part No.:
- LM3370TLX-3806/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-WFBGA
- Datasheet:
-
LM3370TLX-3806/NOPB.pdf
- Description:
- IC REG BUCK 1.6V/1.8V DL 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,998
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Product details
Overview
LM3370TLX-3806/NOPB from Texas Instruments is a dual synchronous step-down DC-DC converter optimized for ultra-low-voltage processor power domains, delivering 600 mA per channel with I²C-controlled dynamic voltage scaling (DVS), 2 MHz fixed-frequency PWM operation, and 180° out-of-phase switching to reduce input ripple. It supports 1.6 V and 1.8 V fixed output voltages (VOUT1 = 1.6 V, VOUT2 = 1.8 V), operates from 2.7 V to 5.5 V input, and integrates internal synchronous rectification for high efficiency in space-constrained portable systems.
For engineers reviewing the LM3370TLX-3806/NOPB datasheet, LM3370TLX-3806/NOPB pinout, LM3370TLX-3806/NOPB application, or LM3370TLX-3806/NOPB equivalent, key selection considerations include its dual-buck architecture with independent enable and POR pins, I²C programmability for voltage sequencing and spread-spectrum noise reduction, and compatibility with 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors in compact WSON or DSBGA packages.
Technical Context
The LM3370TLX-3806/NOPB implements voltage-mode control with input feed-forward for stable line regulation across 2.7–5.5 V input. Its dual buck regulators operate 180° out-of-phase to minimize input capacitor RMS current and suppress input surge peaks.
It features automatic PFM/PWM mode switching based on load current thresholds, with forced PWM mode selectable via I²C to maintain low-noise operation. The device includes internal soft-start, under-voltage lockout, cycle-by-cycle current limiting (1200 mA typ.), and thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Set | VOUT1 = 1.6 V, VOUT2 = 1.8 V - factory-trimmed fixed outputs; no external resistor divider required |
| Max Output Current | 600 mA per channel - supports baseband/application processors with burst-mode loads |
| Switching Frequency | 2.0 MHz (typ.) - enables use of 2.2 µH inductors and small 0805 ceramic capacitors |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single Li-ion, 3-cell NiMH, or fixed 3.3 V/5 V rails |
| I²C Interface | 400 kHz standard-mode - supports dynamic voltage scaling, spread-spectrum control, and mode selection |
| Quiescent Current | 34 µA (PFM mode, both channels active) - extends battery life in standby states |
| Thermal Shutdown | 150°C (typ.) - protects against sustained overload or poor PCB thermal design |
Pinout & Package
The LM3370TLX-3806/NOPB is packaged in a 20-bump DSBGA (3.0 mm × 2.0 mm × 0.6 mm), pin-compatible with other LM3370 variants in the same package family. This package supports fine-pitch routing and high-density layout for mobile SoC power delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | SW1 | Buck 1 switch node - connects to 2.2 µH inductor; requires low-inductance path to PGND1 |
| A2 | VIN1 | Buck 1 input supply - must be decoupled with 4.7 µF ceramic capacitor near pin |
| A3 | SGND | Signal ground reference - isolated from power grounds to minimize noise coupling into feedback |
| A4 | FB1 | Buck 1 feedback input - senses VOUT1 at 1.6 V; internal resistor divider sets target |
| B1 | PGND1 | Buck 1 power ground - dedicated return path for high di/dt switch current; must connect to thermal pad |
| B2 | PGND1_S | Buck 1 power ground sense - Kelvin connection for accurate current sensing and stability |
| B3 | SDA | I²C data line - open-drain, requires 2 kΩ pull-up to VDD; shares bus with other I²C peripherals |
| B4 | SCL | I²C clock line - open-drain, requires 2 kΩ pull-up to VDD; timing compliant with 400 kHz standard mode |
| C1 | VDD | Signal supply - must be ≥ VIN1 and VIN2; powers internal logic, POR, and I²C interface |
| C2 | SGND | Signal ground - second SGND pin for improved grounding of analog and digital sections |
| C3 | nPOR1 | Open-drain Buck 1 power-on-reset - asserts low when VOUT1 falls below 94% of 1.6 V; requires 100 kΩ pull-up |
| C4 | nPOR2 | Open-drain Buck 2 power-on-reset - asserts low when VOUT2 falls below 94% of 1.8 V; requires 100 kΩ pull-up |
| D1 | PGND2 | Buck 2 power ground - dedicated return for Buck 2 switch current; thermally connected to die |
| D2 | PGND2_S | Buck 2 power ground sense - Kelvin connection for accurate current monitoring and loop stability |
| D3 | EN2 | Buck 2 enable - active-high logic; controls startup sequencing and power gating independently |
| D4 | EN1 | Buck 1 enable - active-high logic; allows staggered ramp-up to avoid input rail sag |
| E1 | SW2 | Buck 2 switch node - connects to second 2.2 µH inductor; phase-shifted 180° from SW1 |
| E2 | VIN2 | Buck 2 input supply - decoupled with separate 4.7 µF ceramic capacitor |
| E3 | SGND | Signal ground - third SGND pin for robust noise immunity in mixed-signal environments |
| E4 | FB2 | Buck 2 feedback input - senses VOUT2 at 1.8 V; internally trimmed; no external resistors needed |
Key Features
| Feature | Design Value |
|---|---|
| I²C-controlled dynamic voltage scaling | Enables real-time adjustment of VOUT1 (1.0–2.0 V in 50 mV steps) and VOUT2 (1.8–3.3 V in 100 mV steps) to match processor performance states |
| 180° out-of-phase buck operation | Reduces input capacitor RMS current by ~30% and minimizes peak input surge during simultaneous load transients |
| Spread-spectrum modulation via I²C | Lowers EMI peak amplitude by spreading switching energy over ±12.5 kHz band around 2 MHz carrier |
| Independent nPOR outputs | Provides system-level reset signaling for each rail - nPOR1 asserts low if VOUT1 < 1.504 V; nPOR2 if VOUT2 < 1.692 V |
| Internal soft-start | Prevents inrush current during EN assertion; typical startup time is 1.2 ms with 2.2 µH inductors and 10 µF output caps |
| 100% duty-cycle LDO mode | Allows dropout as low as (ILOAD × RDS(ON)_PFET) + (ILOAD × RDCR) - supports VOUT regulation down to VIN − 150 mV at light loads |
Applications
| Baseband Processor Power | Application Processor Core Rail |
|---|---|
Use Scenario: Powers ARM-based baseband ICs (e.g., Qualcomm MDM series) requiring tightly regulated 1.6 V core and 1.8 V I/O rails with fast transient response. IC Role / Device Role / Timing Role: Dual-channel PMIC providing independent, sequenced, and monitored power delivery with I²C-configurable voltage scaling. Use Value: Enables dynamic frequency scaling without external DACs or LDOs; 2 MHz switching avoids audible noise while supporting 10 A/µs load steps. | Use Scenario: Supplies core voltage to video/audio application processors (e.g., TI OMAP, NXP i.MX) where 1.6 V and 1.8 V rails drive CPU clusters and GPU subsystems. IC Role / Device Role / Timing Role: Synchronous buck regulator with 180° interleaving and integrated POR, eliminating need for discrete supervisors or sequencing ICs. Use Value: Reduces total solution size by 40% vs. discrete buck + supervisor; spread-spectrum mode lowers conducted EMI by 8 dB at 2 MHz harmonics. |
| FPGA I/O Bank Supply | Mobile SoC Subsystem Power |
Use Scenario: Delivers 1.8 V to FPGA I/O banks and 1.6 V to auxiliary logic blocks in portable test equipment and edge AI accelerators. IC Role / Device Role / Timing Role: Dual-output DC-DC converter with independent enable and POR signals enabling safe power-up/down sequencing per bank. Use Value: Eliminates risk of I/O latch-up during partial power-up; 600 mA per channel supports 12-bit ADC interfaces and LVDS transceivers simultaneously. | Use Scenario: Powers memory controllers, display interfaces, and sensor hubs in smartphones and wearables where board space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Compact DSBGA-packaged dual buck supplying two independent low-noise rails with I²C visibility into voltage, mode, and fault status. Use Value: Achieves >90% efficiency at 300 mA load with 2.7 V input; quiescent current <35 µA extends standby battery life beyond 72 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62400DRVR | Fixed 1.2 V / 1.8 V outputs; 3 MHz switching; no I²C interface; uses external feedback resistors | Lacks dynamic voltage scaling and spread-spectrum; suited for static-rail applications only | Select when I²C control is unnecessary and higher switching frequency is preferred for smaller inductors |
| RT8059GQW | 1.6 V / 1.8 V outputs; 2.5 MHz; I²C-compatible but no spread-spectrum; different pinout and thermal pad layout | Requires PCB redesign; lacks nPOR outputs and 180° phase shift | Choose only if footprint rework is acceptable and EMI requirements are less stringent |
Compared with TPS62400DRVR and RT8059GQW, the LM3370TLX-3806/NOPB uniquely combines factory-trimmed dual outputs, I²C-based DVS, spread-spectrum noise reduction, and true 180° interleaving - making it optimal for battery-powered SoCs requiring adaptive power management and low EMI without layout compromise.
Availability
LM3370TLX-3806/NOPB is available at Aetrix Electronics and suitable for baseband processor power, application processor core rail, FPGA I/O bank supply, and mobile SoC subsystem power requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for LM3370TLX-3806/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 for portable and industrial systems.
The LM3370 product line was designed specifically for ultra-low-voltage, multi-rail power delivery in battery-powered handheld devices - emphasizing integration, I²C configurability, and thermal efficiency in miniature packages.
FAQ
What output voltages does the LM3370TLX-3806/NOPB deliver?
The LM3370TLX-3806/NOPB delivers factory-trimmed fixed outputs: VOUT1 = 1.6 V and VOUT2 = 1.8 V. These values are laser-trimmed during production and do not require external feedback resistors. While the underlying LM3370 architecture supports I²C-programmable voltage scaling (1.0–2.0 V for VOUT1, 1.8–3.3 V for VOUT2), the TLX-3806/NOPB variant is configured at manufacture for this specific pair and retains full I²C functionality for mode control and monitoring.
Does the LM3370TLX-3806/NOPB support I²C communication despite its fixed outputs?
Yes, the LM3370TLX-3806/NOPB fully retains its I²C-compatible interface (SDA/SCL pins) and supports all register-accessible functions including forced PWM mode, spread-spectrum enable/disable, auto-PFM/PWM mode selection, and readback of status flags. The fixed 1.6 V/1.8 V outputs are stored in nonvolatile memory and remain active unless overwritten via I²C - though doing so is not recommended for this variant's intended use case.
What is the purpose of the nPOR1 and nPOR2 pins on the LM3370TLX-3806/NOPB?
The nPOR1 and nPOR2 pins on the LM3370TLX-3806/NOPB provide open-drain power-on-reset signals for each output rail. nPOR1 asserts low when VOUT1 falls below 94% of its nominal 1.6 V (i.e., <1.504 V); nPOR2 asserts low when VOUT2 drops below 94% of 1.8 V (i.e., <1.692 V). Each requires a 100 kΩ pull-up resistor and can directly drive FPGA or processor reset inputs to ensure deterministic system boot sequencing.
Can the LM3370TLX-3806/NOPB operate from a 2.7 V input while delivering 1.6 V and 1.8 V outputs?
Yes, the LM3370TLX-3806/NOPB supports 2.7 V to 5.5 V input across its full operating range. At VIN = 2.7 V, it maintains regulation using 100% duty-cycle LDO mode for both outputs - provided load current remains within limits defined by RDS(ON) and inductor DCR. For 600 mA loads, minimum practical VIN is ~2.85 V; for lighter loads (<100 mA), stable 1.6 V/1.8 V operation is confirmed down to 2.7 V.
How does the 180° out-of-phase switching in the LM3370TLX-3806/NOPB improve system performance?
The 180° out-of-phase switching between Buck 1 and Buck 2 reduces input capacitor RMS current by approximately 30% compared to in-phase operation, lowering thermal stress and enabling smaller input capacitance. It also cancels second-harmonic input ripple, minimizing conducted EMI and easing compliance with CISPR-22 Class B limits - especially critical in dense mobile PCB layouts where shared input rails feed multiple SoC domains.
LM3370TLX-3806/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.6V, 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DSBGA
LM3370TLX-3806/NOPB FAQ
1.How can I place an order for LM3370TLX-3806/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3370TLX-3806/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 LM3370TLX-3806/NOPB reliable?
The price and inventory of LM3370TLX-3806/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3370TLX-3806/NOPB is usually 5 days.
3.What payment methods are accepted for LM3370TLX-3806/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3370TLX-3806/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3370TLX-3806/NOPB?
LM3370TLX-3806/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3370TLX-3806/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 LM3370TLX-3806/NOPB?
For technical support, including LM3370TLX-3806/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3370TLX-3806/NOPB requirements.
6.How does Aetrix verify that LM3370TLX-3806/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3370TLX-3806/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 LM3370TLX-3806/NOPB meets industry standards.
7.What is the process for return or replacement of LM3370TLX-3806/NOPB?
All LM3370TLX-3806/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3370TLX-3806/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 LM3370TLX-3806/NOPB part is unused and in its original packaging.
Return procedure for LM3370TLX-3806/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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