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Texas Instruments LM3370TL-3806/NOPB
- Part No.:
- LM3370TL-3806/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-WFBGA
- Datasheet:
-
LM3370TL-3806/NOPB.pdf
- Description:
- IC REG BUCK 1.6V/1.8V DL 20DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3370TL-3806/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 battery or 2.7V–5.5V input rail. It delivers 600 mA per channel with factory-configured output voltages of 1.6 V (VOUT1) and 1.8 V (VOUT2), supports I²C-controlled dynamic voltage scaling, operates at 2 MHz fixed switching frequency, and features automatic PFM/PWM mode switching for high efficiency across load ranges - used in baseband and application processor power domains.
For engineers reviewing the LM3370TL-3806/NOPB datasheet, LM3370TL-3806/NOPB pinout, LM3370TL-3806/NOPB application, or LM3370TL-3806/NOPB equivalent, key selection criteria include its dual-channel 600 mA capability, I²C programmability for voltage scaling, 180° out-of-phase buck timing to reduce input ripple, spread-spectrum noise reduction, and support for compact 2.2 µH inductors and ceramic capacitors in portable power management designs.
Technical Context
The LM3370TL-3806/NOPB implements two independent voltage-mode synchronous buck regulators with internal PFET/NFET switches, operating at 2 MHz nominal switching frequency and 180° phase offset to minimize input capacitor RMS current. Its I²C interface enables real-time control of output voltages (VOUT1: 1.0–2.0 V in 50 mV steps; VOUT2: 1.8–3.3 V in 100 mV steps), forced PWM mode, and spread-spectrum modulation.
Each channel integrates soft-start, under-voltage lockout, cycle-by-cycle current limiting (1200 mA typ.), thermal shutdown (150°C), and independent power-on-reset outputs (nPOR1/nPOR2) with 94% rising-edge threshold. The device supports low-dropout operation via 100% duty cycle control and uses internal synchronous rectification to eliminate external Schottky diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Set | 1.6 V (Buck 1), 1.8 V (Buck 2) - factory-trimmed, non-adjustable without I²C reprogramming |
| Max Output Current | 600 mA per channel - sustained delivery with thermal derating above 85°C ambient |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single Li-Ion (2.7–4.2 V) and 3.3 V/5 V fixed rails |
| Switching Frequency | 2.0 MHz (typ.) - enables use of 2.2 µH inductors and small 0805 ceramic capacitors |
| I²C Interface | 400 kHz standard-mode - supports dynamic voltage scaling, mode control, and spread-spectrum enable |
| Efficiency Peak | 90%+ at 600 mA - achieved using internal synchronous rectification and low RDS(on) PFET/NFET switches |
| Quiescent Current | 34 µA (PFM mode, both channels active) - extends battery life in standby states |
Pinout & Package
The LM3370TL-3806/NOPB is packaged in a 20-bump DSBGA (3.0 mm × 2.0 mm × 0.6 mm), pin-compatible with other LM3370 DSBGA variants and optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | SW1 | Buck 1 switch node - connects to inductor and requires low-inductance layout to minimize EMI |
| A2 | VIN1 | Buck 1 input supply - must be decoupled with 4.7 µF ceramic capacitor near package |
| A3 | SGND | Signal ground reference - isolated from power grounds to reduce noise coupling into feedback paths |
| A4 | FB1 | Buck 1 feedback input - senses output voltage via resistor divider; sets 1.6 V regulation point |
| B1 | PGND1 | Buck 1 power ground - return path for high-current switch node; must connect to thermal pad and power plane |
| 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; bidirectional communication with host controller |
| B4 | SCL | I²C clock line - open-drain, requires 2 kΩ pull-up to VDD; synchronizes register reads/writes |
| C1 | VDD | Internal logic supply - must be ≥ VIN1 and VIN2; powers I²C interface and control circuitry |
| C2 | SGND | Signal ground - second SGND pin for improved grounding integrity in high-density layouts |
| C3 | nPOR1 | Open-drain Buck 1 power-on reset - asserts low when VOUT1 < 94% of target; requires 100 kΩ pull-up |
| C4 | nPOR2 | Open-drain Buck 2 power-on reset - asserts low when VOUT2 < 94% of target; requires 100 kΩ pull-up |
| D1 | PGND2 | Buck 2 power ground - return path for Buck 2 switch node; separate from PGND1 to avoid cross-talk |
| D2 | PGND2_S | Buck 2 power ground sense - Kelvin connection for precise regulation and transient response |
| D3 | EN2 | Buck 2 enable input - logic high (>1.0 V) activates Buck 2; allows independent sequencing with EN1 |
| D4 | EN1 | Buck 1 enable input - logic high (>1.0 V) activates Buck 1; supports staggered startup and fault isolation |
| E1 | SW2 | Buck 2 switch node - connects to second inductor; 180° phase shift reduces input ripple current |
| E2 | VIN2 | Buck 2 input supply - decoupled independently with 4.7 µF ceramic capacitor |
| E3 | SGND | Signal ground - third SGND pin enhances noise immunity for analog and digital sections |
| E4 | FB2 | Buck 2 feedback input - sets 1.8 V regulation point; referenced to SGND, not PGND |
Key Features
| Feature | Design Value |
|---|---|
| I²C-controlled dynamic voltage scaling | Enables real-time adjustment of VOUT1 (1.0–2.0 V) and VOUT2 (1.8–3.3 V) to match processor DVFS states |
| 180° out-of-phase buck timing | Reduces input capacitor RMS current by ~30%, allowing smaller 4.7 µF input capacitors |
| Spread-spectrum modulation | Lowers peak EMI by ±1% frequency dithering - critical for FCC/CE compliance in handheld devices |
| Independent POR outputs (nPOR1/nPOR2) | Provides sequenced system reset signals tied to individual rail validity - eliminates need for external supervisors |
| Auto PFM/PWM mode switching | Maintains >85% efficiency from 1 mA to 600 mA per channel without external mode control logic |
| Internal synchronous rectification | Eliminates external Schottky diodes and associated losses - improves light-load efficiency by 8–12% |
Applications
| Baseband Processor Power | Application Processor Core Supply |
|---|---|
Use Scenario: Powers ARM9/ARM11 baseband processors in 3G/4G modems requiring tightly regulated 1.6 V core and 1.8 V I/O rails. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator delivering independent, sequenced 1.6 V and 1.8 V supplies with POR monitoring. Use Value: Factory-set 1.6 V/1.8 V outputs eliminate external resistor dividers; I²C interface enables runtime voltage scaling during modem sleep/wake transitions. | Use Scenario: Supplies video/audio application processors (e.g., TI OMAP, Qualcomm Snapdragon) with dynamically adjustable core voltage. IC Role / Device Role / Timing Role: I²C-programmable dual buck converter supporting DVFS by adjusting VOUT1 from 1.0 V to 1.8 V in 50 mV steps. Use Value: Reduces system power by up to 40% during low-activity states while maintaining 600 mA headroom for burst processing. |
| FPGA/CPLD I/O Bank Supply | Portable Device System Rail Generation |
Use Scenario: Generates 1.8 V I/O bank voltage for Xilinx Spartan or Intel MAX 10 FPGA in battery-powered test equipment. IC Role / Device Role / Timing Role: High-efficiency, low-noise dual buck supplying stable 1.8 V with spread-spectrum EMI reduction. Use Value: 2 MHz switching and integrated synchronous rectification enable compact 0805 capacitor footprint and <15 mVpp output ripple. | Use Scenario: Provides primary 1.6 V and 1.8 V system rails in medical wearables powered by single-cell Li-Ion batteries. IC Role / Device Role / Timing Role: Dual buck converter operating from 2.7–4.2 V input with auto PFM mode extending battery runtime. Use Value: 34 µA quiescent current in PFM mode adds >12 hours of standby time versus fixed-frequency alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | Single-channel, 600 mA, 2.25–6.5 V input, fixed 1.8 V output; no I²C interface or dual-rail capability | Only suitable for single-rail systems; lacks dynamic voltage scaling and independent POR | Select only if dual output and I²C control are unnecessary and board space permits two separate converters |
| RTQ2132B-QA | Automotive-grade dual 600 mA buck; 2.5–5.5 V input; I²C interface; supports 0.6–3.3 V outputs; AEC-Q100 qualified | Designed for automotive infotainment; higher cost and qualification overhead for consumer portables | Choose for automotive applications requiring ASIL-B compliance; overqualified for handheld consumer use |
Compared with TPS62231DRYT and RTQ2132B-QA, the LM3370TL-3806/NOPB uniquely combines factory-configured 1.6 V/1.8 V outputs, I²C-based dynamic scaling, and 2 MHz operation in a 3.0 × 2.0 mm DSBGA - offering optimal integration for space- and efficiency-critical portable processors without automotive qualification overhead.
Availability
LM3370TL-3806/NOPB is available at Aetrix Electronics and suitable for baseband processor power, application processor DVFS, FPGA I/O supply, and portable medical device system rail generation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3370TL-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 ICs, with decades of expertise in high-efficiency DC-DC conversion for portable and battery-powered systems.
The LM3370 product line was designed specifically for ultra-low-voltage, multi-rail power management in mobile baseband and application processors - emphasizing I²C configurability, compact packaging, and seamless integration with DVFS-aware SoCs.
FAQ
What are the fixed output voltages programmed into the LM3370TL-3806/NOPB?
The LM3370TL-3806/NOPB is factory-configured with VOUT1 = 1.6 V and VOUT2 = 1.8 V. These values are set at wafer test and can be reprogrammed via the I²C interface to any value within the supported ranges: VOUT1 = 1.0–2.0 V (50 mV steps) and VOUT2 = 1.8–3.3 V (100 mV steps). The LM3370TL-3806/NOPB retains these settings across power cycles unless rewritten.
Does the LM3370TL-3806/NOPB require external MOSFETs or diodes?
No. The LM3370TL-3806/NOPB integrates both high-side PFET and low-side NFET switches per channel, along with internal synchronous rectification circuitry. This eliminates the need for external MOSFETs, Schottky diodes, or gate drivers - reducing bill-of-materials count and PCB area. The LM3370TL-3806/NOPB only requires external inductors, input/output capacitors, and feedback resistors (if reprogramming outputs).
Can the LM3370TL-3806/NOPB operate from a single 3.7 V Li-Ion cell throughout its full discharge range?
Yes. The LM3370TL-3806/NOPB supports input voltages from 2.7 V to 5.5 V, covering the full discharge curve of a single Li-Ion cell (4.2 V down to 2.7 V). Its 100% duty-cycle capability ensures regulation remains stable even at minimum input, and the 1.6 V/1.8 V outputs remain within specification across this range when loaded ≤600 mA per channel. The LM3370TL-3806/NOPB maintains >85% efficiency from 1 mA to full load.
How does the 180° phase shift between the two buck channels benefit system design?
The 180° out-of-phase switching of the LM3370TL-3806/NOPB's two buck regulators reduces input capacitor RMS current by approximately 30%, allowing smaller 4.7 µF ceramic input capacitors instead of larger bulk electrolytics. This lowers total solution size, improves reliability, and reduces input voltage ripple - critical for noise-sensitive RF and audio subsystems sharing the same battery rail. The LM3370TL-3806/NOPB achieves this timing inherently; no external synchronization is required.
Is spread-spectrum modulation enabled by default on the LM3370TL-3806/NOPB?
No. Spread-spectrum modulation is disabled by default and must be explicitly enabled via the I²C interface using register bit configuration. When activated, it dithers the 2 MHz switching frequency by ±1% to reduce peak EMI emissions - particularly beneficial for passing FCC Class B conducted and radiated emissions tests in handheld devices. The LM3370TL-3806/NOPB supports this feature without external components or layout changes.
LM3370TL-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
LM3370TL-3806/NOPB FAQ
1.How can I place an order for LM3370TL-3806/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3370TL-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 LM3370TL-3806/NOPB reliable?
The price and inventory of LM3370TL-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 LM3370TL-3806/NOPB is usually 5 days.
3.What payment methods are accepted for LM3370TL-3806/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3370TL-3806/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3370TL-3806/NOPB?
LM3370TL-3806/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3370TL-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 LM3370TL-3806/NOPB?
For technical support, including LM3370TL-3806/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3370TL-3806/NOPB requirements.
6.How does Aetrix verify that LM3370TL-3806/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3370TL-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 LM3370TL-3806/NOPB meets industry standards.
7.What is the process for return or replacement of LM3370TL-3806/NOPB?
All LM3370TL-3806/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3370TL-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 LM3370TL-3806/NOPB part is unused and in its original packaging.
Return procedure for LM3370TL-3806/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3370TL-3806/NOPB Tags
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