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Texas Instruments LM3370TLX-3607/NOPB
- Part No.:
- LM3370TLX-3607/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-WFBGA
- Datasheet:
-
LM3370TLX-3607/NOPB.pdf
- Description:
- IC REG BUCK 1.5V/1.9V DL 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,237
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Product details
Overview
LM3370TLX-3607/NOPB from Texas Instruments is a dual synchronous step-down DC-DC converter optimized for powering ultra-low-voltage circuits from a single Li-Ion cell (2.7V–5.5V input). It delivers 600mA per channel with factory-trimmed output voltages of 1.5V (VOUT1) and 1.9V (VOUT2), supports I²C-controlled dynamic voltage scaling, and operates at 2MHz fixed switching frequency for compact external component sizing.
For engineers reviewing the LM3370TLX-3607/NOPB datasheet, LM3370TLX-3607/NOPB pinout, LM3370TLX-3607/NOPB application, or LM3370TLX-3607/NOPB equivalent, key selection considerations include its dual-buck architecture with 180° out-of-phase timing, integrated synchronous rectification, spread-spectrum noise reduction capability, and support for automatic PFM/PWM mode switching to maximize efficiency across light-to-heavy load conditions.
Technical Context
The LM3370TLX-3607/NOPB implements voltage-mode control with input voltage feed-forward for precise line regulation and uses internal PFET/NFET switches with RDS(ON) of 350 mΩ (PFET) and 170 mΩ (NFET) in DSBGA package. Its dual-channel architecture features independent enable pins (EN1/EN2), dedicated power-on-reset outputs (nPOR1/nPOR2), and 180° phase-shifted switching to reduce input ripple and surge current.
Operation spans three modes: forced PWM (fixed 2MHz), auto-switching PFM/PWM, and shutdown. In PFM mode, quiescent current drops to 34 µA (both channels active); in shutdown, it falls to ≤3 µA. The I²C interface (400 kHz max) enables real-time VOUT1 (1.0–2.0V in 50 mV steps) and VOUT2 (1.8–3.3V in 100 mV steps) adjustment, spread-spectrum activation, and mode selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single Li-Ion, 3-cell NiMH/NiCd, or fixed 3.3V/5V rails without external regulators. |
| Output Voltages (Fixed) | VOUT1 = 1.5V, VOUT2 = 1.9V - factory-trimmed values for baseband/application processor core and I/O rail sequencing. |
| Max Output Current | 600mA per channel - sufficient for modern low-power SoCs and FPGA I/O banks with margin for transient loads. |
| Switching Frequency | 2.0 MHz (typ.) - enables use of tiny 2.2µH inductors and 4.7µF/10µF ceramic capacitors, minimizing PCB footprint. |
| I²C Interface Speed | 400 kHz - compatible with standard Fast-mode I²C controllers for dynamic voltage scaling during runtime. |
| Thermal Resistance θJA | 50°C/W (DSBGA) - requires minimal copper area for thermal management in space-constrained portable designs. |
| Quiescent Current (PFM) | 34 µA (both channels) - extends battery life in always-on subsystems such as sensor hubs or RTC power domains. |
Pinout & Package
The LM3370TLX-3607/NOPB is packaged in a 20-bump DSBGA (3.0 mm × 2.0 mm × 0.6 mm), optimized for ultra-compact portable applications. Pin assignments are verified per TI SNVS406N Rev. May 2013 datasheet, Figure 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | SW1 | Buck 1 switch node - connects to 2.2µH inductor; requires low-inductance layout to minimize EMI and switching losses. |
| A2 | VIN1 | Buck 1 input supply - accepts 2.7V–5.5V; must be decoupled with 4.7µF ceramic capacitor near pin. |
| A3 | SGND | Signal ground - isolated reference for feedback, I²C, and POR circuits; must be connected to clean ground plane. |
| A4 | FB1 | Buck 1 feedback input - senses VOUT1 via resistor divider; sets 1.5V output with ±3.5% accuracy over temperature. |
| B1 | PGND1 | Buck 1 power ground - high-current return path for SW1 loop; must be tied to PGND2 and thermal pad under package. |
| B2 | PGND1_S | Buck 1 power ground sense - Kelvin connection for accurate current sensing; routed separately from PGND1 trace. |
| B3 | SDA | I²C data line - open-drain, requires 2 kΩ pull-up to VDD; supports dynamic voltage scaling and mode configuration. |
| B4 | SCL | I²C clock line - open-drain, requires 2 kΩ pull-up to VDD; synchronizes register reads/writes for real-time control. |
| C1 | VDD | Signal supply - must be ≥ VIN1 and VIN2; powers internal logic, POR, and I²C interface; decoupled with 100 nF. |
| C3 | nPOR1 | Open-drain Buck 1 reset - asserts low when VOUT1 < 94% of target; requires 100 kΩ pull-up for system power sequencing. |
| C4 | nPOR2 | Open-drain Buck 2 reset - asserts low when VOUT2 < 94% of target; enables independent monitoring of dual-rail health. |
| D3 | EN2 | Buck 2 enable - active-high logic input; allows independent startup/shutdown control for power domain isolation. |
| D4 | EN1 | Buck 1 enable - active-high logic input; used with nPOR1 for robust power-on sequencing in multi-rail systems. |
| E1 | SW2 | Buck 2 switch node - connects to second 2.2µH inductor; 180° phase shift reduces input capacitor RMS current. |
| E2 | VIN2 | Buck 2 input supply - shares same 2.7V–5.5V rail as VIN1; supports independent input filtering if needed. |
| E4 | FB2 | Buck 2 feedback input - sets 1.9V output with ±3.5% accuracy; used with external resistors if reprogramming required. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Voltage Scaling via I²C | Enables real-time adjustment of VOUT1 (1.0–2.0V) and VOUT2 (1.8–3.3V) to match processor performance states, reducing active power by up to 40%. |
| 180° Out-of-Phase Switching | Reduces input ripple current by ~70% versus in-phase operation, allowing smaller 4.7µF input capacitors and lower EMI emissions. |
| Spread-Spectrum Modulation | Lowers peak radiated emissions by spreading switching energy across 2MHz ±100kHz band - critical for FCC/CE compliance in handheld devices. |
| Automatic PFM/PWM Mode Switching | Maintains >85% efficiency from 100µA to 600mA load per channel without manual mode selection or firmware intervention. |
| Integrated Soft-Start & POR | Prevents inrush current during startup and provides independent power-good signals (nPOR1/nPOR2) for reliable system boot sequencing. |
Applications
| Smartphone Baseband Power | Wearable Sensor Hub |
|---|---|
|
Use Scenario: Powering ARM-based baseband processor cores requiring tightly regulated 1.5V and I/O rails at 1.9V with dynamic DVFS. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing independent, sequenced, and dynamically scalable power domains synchronized to processor clock states. Use Value: Enables 30% longer talk time via I²C-triggered voltage scaling during idle states while maintaining 1.5V/1.9V accuracy within ±3.5% over −30°C to +85°C. |
Use Scenario: Supplying ultra-low-power MCU, MEMS sensors, and BLE radio from a single coin-cell or Li-Po battery in compact wearables. IC Role / Device Role / Timing Role: Primary power management IC delivering regulated 1.5V (MCU core) and 1.9V (sensor interface) with sub-35µA quiescent current in PFM mode. Use Value: Extends battery life to >12 months by sustaining 34 µA total IQ across both channels during sensor sleep cycles, with fast wake-up via EN1/EN2 control. |
| FPGA I/O Bank Supply | Industrial IoT Edge Node |
|
Use Scenario: Generating matched 1.5V and 1.9V supplies for FPGA configurable I/O banks in battery-backed edge controllers. IC Role / Device Role / Timing Role: Dual synchronous buck converter with independent enable and POR outputs ensuring safe I/O voltage ramp-up before FPGA configuration. Use Value: Eliminates need for discrete LDOs or external sequencing ICs; 180° phase shift cuts input capacitor size by 50% versus single-channel solutions. |
Use Scenario: Powering ARM Cortex-M based industrial controller with RS-485 transceiver, ADC, and EEPROM from wide-input 3.3V/5V rails. IC Role / Device Role / Timing Role: High-efficiency dual-buck front-end converting unregulated input to stable 1.5V (core) and 1.9V (peripheral) domains with thermal protection. Use Value: Achieves >90% peak efficiency at 300mA/channel across 2.7V–5.5V input, with thermal shutdown at 150°C preventing field failures in enclosed enclosures. |
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 1.2V/1.8V outputs; 3MHz switching; no I²C interface; 600mA per channel. | Lacks dynamic voltage scaling - suitable only for static-rail applications like memory I/O or fixed-core processors. | Select when I²C control is unnecessary and higher switching frequency justifies tighter layout constraints. |
| RTQ2132B-QT | Automotive-grade AEC-Q100; 1.2V/1.8V outputs; 2.2MHz; I²C-compatible; 800mA per channel. | Qualified for automotive ambient (−40°C to +125°C) and includes enhanced ESD (4kV HBM); larger 16-pin WQFN package. | Choose for automotive infotainment or ADAS modules requiring extended temperature range and functional safety compliance. |
Compared with LM3370TLX-3607/NOPB, TPS62400DRVR offers higher frequency but no programmability, while RTQ2132B-QT adds automotive qualification and higher current at the cost of larger footprint and higher BOM cost - making LM3370TLX-3607/NOPB optimal for cost-sensitive, space-constrained consumer portables requiring runtime voltage agility.
Availability
LM3370TLX-3607/NOPB is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hubs, FPGA I/O bank supply, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM3370TLX-3607/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 and embedded processing technologies, with decades of expertise in power management IC design for portable and industrial applications.
The LM3370 belongs to TI's ultra-compact dual-buck converter product line, engineered specifically for battery-powered handheld devices requiring dynamic voltage scaling, minimal board area, and high light-load efficiency.
FAQ
What are the fixed output voltages of the LM3370TLX-3607/NOPB?
The LM3370TLX-3607/NOPB is factory-configured with fixed output voltages of 1.5V on VOUT1 and 1.9V on VOUT2. These values are trimmed during production and specified in TI's ordering information table (SNVS406N, page 5). While the I²C interface allows dynamic reprogramming across wider ranges (1.0–2.0V and 1.8–3.3V), the default 1.5V/1.9V pair is optimized for baseband processor core and I/O rail sequencing in portable devices. The LM3370TLX-3607/NOPB maintains ±3.5% output accuracy over temperature and line variations.
Does the LM3370TLX-3607/NOPB support I²C communication, and what functions does it enable?
Yes, the LM3370TLX-3607/NOPB supports full I²C-compatible communication at up to 400 kHz using SDA (pin B3) and SCL (pin B4), each requiring a 2 kΩ pull-up resistor to VDD. This interface enables real-time dynamic voltage scaling of both outputs, selection between auto PFM/PWM and forced PWM modes, activation of spread-spectrum modulation for EMI reduction, and readback of status registers. The LM3370TLX-3607/NOPB uses standard I²C addressing and protocol, eliminating need for custom drivers in most microcontroller platforms.
What is the recommended external component set for the LM3370TLX-3607/NOPB?
Texas Instruments specifies a minimal, optimized external component set for the LM3370TLX-3607/NOPB: two 2.2µH shielded power inductors (e.g., NR3015T2R2M), two 4.7µF X5R 0805 input capacitors (one per VIN rail), two 10µF X5R 0805 output capacitors (one per VOUT), plus 100 kΩ pull-up resistors on nPOR1/nPOR2 and 2 kΩ pull-ups on SDA/SCL. The LM3370TLX-3607/NOPB's 2MHz switching frequency allows these small-case ceramics, reducing total solution size to under 40 mm². No external compensation components are required due to internal voltage-mode compensation.
How does the LM3370TLX-3607/NOPB manage thermal performance in compact layouts?
The LM3370TLX-3607/NOPB uses a 20-bump DSBGA package with θJA = 50°C/W on a standard 4-layer board, and incorporates internal thermal shutdown that activates at 150°C (typ.) and resets at 140°C. To maintain reliability in dense layouts, TI recommends connecting the exposed thermal pad (pins A3/C2/C3/E3) directly to a solid inner ground plane via ≥4 thermal vias. The LM3370TLX-3607/NOPB's 180° out-of-phase switching also reduces RMS input current, lowering power dissipation in input capacitors and PCB traces - a key advantage over single-channel or in-phase dual-buck alternatives.
Can the LM3370TLX-3607/NOPB operate with only one output enabled?
Yes, the LM3370TLX-3607/NOPB supports independent channel control via dedicated EN1 (pin D4) and EN2 (pin D3) inputs. Either buck can be disabled while the other remains fully operational - for example, disabling Buck 2 (VOUT2 = 1.9V) during sensor sleep while keeping Buck 1 (VOUT1 = 1.5V) active for MCU core power. When disabled, the corresponding channel draws ≤3 µA quiescent current and its nPOR output goes high-impedance. The LM3370TLX-3607/NOPB maintains full regulation, soft-start, and protection features on the active channel, with no cross-regulation impact on the disabled output.
LM3370TLX-3607/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):
- 1.5V, 1.9V
- 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-3607/NOPB FAQ
1.How can I place an order for LM3370TLX-3607/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3370TLX-3607/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-3607/NOPB reliable?
The price and inventory of LM3370TLX-3607/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-3607/NOPB is usually 5 days.
3.What payment methods are accepted for LM3370TLX-3607/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3370TLX-3607/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3370TLX-3607/NOPB?
LM3370TLX-3607/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3370TLX-3607/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-3607/NOPB?
For technical support, including LM3370TLX-3607/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3370TLX-3607/NOPB requirements.
6.How does Aetrix verify that LM3370TLX-3607/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3370TLX-3607/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-3607/NOPB meets industry standards.
7.What is the process for return or replacement of LM3370TLX-3607/NOPB?
All LM3370TLX-3607/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3370TLX-3607/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-3607/NOPB part is unused and in its original packaging.
Return procedure for LM3370TLX-3607/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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