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Texas Instruments LM3370SDX-3013/NOPB
- Part No.:
- LM3370SDX-3013/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM3370SDX-3013/NOPB.pdf
- Description:
- IC REG BUCK 1.2V/2.5V DL 16WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3370SDX-3013/NOPB from Texas Instruments is a dual synchronous step-down DC-DC converter with I²C-controlled dynamic voltage scaling, delivering 600 mA per channel across two independent outputs (VOUT1 = 1.2 V, VOUT2 = 2.5 V), operating from 2.7 V to 5.5 V input, and featuring 2 MHz fixed-frequency PWM switching with automatic PFM/PWM mode transition. It is used in baseband and application processors for real-time power-state optimization.
For engineers reviewing the LM3370SDX-3013/NOPB datasheet, LM3370SDX-3013/NOPB pinout, LM3370SDX-3013/NOPB application, or LM3370SDX-3013/NOPB equivalent, key selection considerations include I²C programmability of output voltages, 180° out-of-phase buck timing for input ripple reduction, spread-spectrum noise abatement, internal synchronous rectification, and WSON-16 package thermal performance (θJA = 26°C/W).
Technical Context
The LM3370SDX-3013/NOPB implements voltage-mode control with input-voltage feed-forward for stable line regulation (0.031%/V) and load regulation (0.0013%/mA). Its dual buck regulators operate 180° out-of-phase to minimize input capacitor RMS current and reduce input surge.
It integrates PFET/NFET synchronous switches with RDS(ON) of 390 mΩ/240 mΩ (WSON), supports 100% duty-cycle LDO-like operation, and includes independent enable pins (EN1/EN2), open-drain POR outputs (nPOR1/nPOR2), and I²C-compatible SDA/SCL with 400 kHz max clock frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Setpoints | VOUT1 = 1.2 V, VOUT2 = 2.5 V - factory-trimmed fixed outputs enabling immediate use without external feedback resistors |
| Max Output Current | 600 mA per channel - sufficient to power core logic of baseband processors and FPGA I/O banks |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single Li-ion battery (3.0–4.2 V) and regulated 3.3 V/5 V rails |
| Switching Frequency | 2 MHz (typ.) - enables use of compact 2.2 µH inductors and low-ESR ceramic capacitors |
| I²C Interface | 400 kHz compliant - allows dynamic reconfiguration of VOUT, mode (PFM/PWM), and spread-spectrum enable |
| Quiescent Current | 34 µA (PFM mode, both channels active) - extends battery life in standby states of portable devices |
| Thermal Resistance | θJA = 26°C/W (WSON-16) - supports >1.5 W power dissipation on standard 4-layer PCBs |
Pinout & Package
The LM3370SDX-3013/NOPB is packaged in a 4 mm × 5 mm × 0.8 mm, 16-lead non-pullback WSON (package code NHR0016B), with exposed thermal pad for enhanced heat dissipation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN2 | Buck 2 input supply | Accepts 2.7–5.5 V; powers PFET/NFET switches for second regulator channel |
| SW2 | Buck 2 switch node | Connects to inductor and output filter; high dv/dt node requiring careful layout |
| PGND2 | Buck 2 power ground | Return path for Buck 2 high-current loop; must be separated from SGND to avoid noise coupling |
| VDD | Signal supply | Must be ≥ VIN1 and VIN2; powers internal logic, POR, and I²C interface |
| SGND | Signal ground | Reference for FB1/FB2, SDA/SCL, EN1/EN2, nPOR1/nPOR2; connects to system analog ground |
| PGND1 | Buck 1 power ground | Return path for Buck 1 high-current loop; isolated from PGND2 to prevent cross-regulator interference |
| SW1 | Buck 1 switch node | Connects to inductor and output filter; 180° phase-shifted from SW2 to reduce input ripple |
| VIN1 | Buck 1 input supply | Accepts 2.7–5.5 V; independent of VIN2, enabling dual-rail input configurations |
| FB1 | Buck 1 feedback input | Monitors VOUT1 via resistor divider; sets regulation point at 1.2 V for this variant |
| SDA | I²C data line | Open-drain, requires 2 kΩ pull-up; transmits register reads/writes for dynamic voltage scaling |
| SCL | I²C clock line | Open-drain, requires 2 kΩ pull-up; synchronizes I²C communication up to 400 kHz |
| nPOR1 | Buck 1 power-on reset | Open-drain output asserting low when VOUT1 < 92% of target; requires 100 kΩ pull-up |
| nPOR2 | Buck 2 power-on reset | Open-drain output asserting low when VOUT2 < 92% of target; enables sequenced power-up |
| EN1 | Buck 1 enable | Active-high logic input; controls startup/shutdown of first regulator independently |
| EN2 | Buck 2 enable | Active-high logic input; allows flexible power sequencing between processor core and I/O domains |
| FB2 | Buck 2 feedback input | Monitors VOUT2 via resistor divider; sets regulation point at 2.5 V for this variant |
Key Features
| Feature | Design Value |
|---|---|
| I²C-controlled dynamic voltage scaling | Enables runtime 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 DVFS states |
| Automatic PFM/PWM mode switching | Maintains >85% efficiency down to 100 µA load via seamless transition-no external control required |
| 180° out-of-phase buck timing | Reduces input capacitor RMS current by ~30% versus in-phase operation, lowering thermal stress and EMI |
| Integrated synchronous rectification | Eliminates external Schottky diodes; achieves >90% peak efficiency at 600 mA with RDS(ON) = 390/240 mΩ |
| Spread-spectrum modulation | Reduces peak radiated emissions by spreading switching energy over ±100 kHz bandwidth around 2 MHz center |
| Independent power-on-reset outputs | nPOR1/nPOR2 provide sequenced system reset assertion with 50 ms default delay and trimmable thresholds |
Applications
| Baseband Processor Core Power | Application Processor I/O Supply |
|---|---|
Use Scenario: Powers ARM-based baseband ICs (e.g., Qualcomm MDM series) requiring dynamically scaled core voltage (1.0–1.3 V) during sleep/active modes. IC Role / Device Role / Timing Role: Dual-output buck regulator providing independent, I²C-adjustable VDD_CORE (1.2 V) and VDD_IO (2.5 V) with synchronized startup. Use Value: Enables 30% lower active power vs. fixed-output converters via precise DVFS alignment with modem processing load. | Use Scenario: Supplies configurable I/O voltage (1.8–3.3 V) to application processors (e.g., TI OMAP) interfacing with multiple memory types (DDR, NAND, SDIO). IC Role / Device Role / Timing Role: Second buck channel delivers stable 2.5 V to processor I/O domain while supporting hot-plug voltage reconfiguration via I²C. Use Value: Eliminates need for discrete level shifters or additional LDOs when changing memory interface standards. |
| FPGA Core and Auxiliary Rail | Portable Media Device Power Management |
Use Scenario: Generates 1.2 V core and 2.5 V auxiliary rails for Spartan-6 or Cyclone IV FPGAs in battery-powered test equipment. IC Role / Device Role / Timing Role: Dual synchronous buck with independent EN1/EN2 enables staggered FPGA configuration sequencing and partial reconfiguration power gating. Use Value: Reduces total solution size by 40% vs. two discrete converters; 2 MHz switching avoids audible noise in handheld enclosures. | Use Scenario: Powers audio codec, display driver, and wireless SoC in Bluetooth headphones with single-cell Li-ion input. IC Role / Device Role / Timing Role: Delivers ultra-low-noise 1.2 V (core) and 2.5 V (peripheral) with spread-spectrum and PFM mode for >100-hour standby. Use Value: Achieves 35 µA total quiescent current in deep-sleep state-critical for multi-week battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62400DRVR | Fixed 1.2 V/1.8 V outputs; no I²C interface; 3 MHz switching; smaller 2.5 mm × 2.5 mm DSBGA | Lacks dynamic voltage scaling-suitable only for static rail requirements | Select when board space is constrained and output voltages never change during operation |
| RT8059ZSP | 1.2 V/2.5 V fixed outputs; no I²C; 1.5 MHz switching; integrated soft-start; higher RDS(ON) (500/300 mΩ) | Lower efficiency at 600 mA load; no spread-spectrum or POR outputs | Select for cost-sensitive designs where EMI compliance is less stringent and sequencing is handled externally |
Compared with TPS62400DRVR and RT8059ZSP, the LM3370SDX-3013/NOPB uniquely supports runtime I²C reprogramming of output voltages and spread-spectrum EMI reduction-making it optimal for DVFS-enabled processors and noise-sensitive portable systems.
Availability
LM3370SDX-3013/NOPB is available at Aetrix Electronics and suitable for baseband processor power, FPGA auxiliary rail generation, portable media device power management, and application processor I/O supply requiring stable component supply across production lifecycles.
Supply support for LM3370SDX-3013/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 over 50 years of innovation in high-efficiency power conversion.
The LM3370SDX-3013/NOPB belongs to TI's portable power management portfolio, engineered specifically for ultra-low-voltage, multi-rail systems in smartphones, tablets, and wearable electronics where dynamic voltage scaling and minimal board area are critical.
FAQ
What output voltages does the LM3370SDX-3013/NOPB deliver?
The LM3370SDX-3013/NOPB is factory-configured to deliver fixed output voltages of 1.2 V on VOUT1 and 2.5 V on VOUT2. These values correspond to the "3013" ordering suffix per TI's LM3370 voltage option table. While the underlying IC supports I²C-programmable ranges (VOUT1: 1.0–2.0 V; VOUT2: 1.8–3.3 V), the LM3370SDX-3013/NOPB variant is trimmed and tested for these specific setpoints and does not require external feedback resistors for nominal operation.
Does the LM3370SDX-3013/NOPB support true 100% duty-cycle operation?
Yes, the LM3370SDX-3013/NOPB supports 100% duty-cycle operation in low-dropout mode, where the internal PFET remains fully on and the NFET is off. This allows regulation even when VIN approaches VOUT-critical for maintaining core voltage during Li-ion battery discharge down to 3.0 V. The minimum input voltage is calculated as VIN,MIN = ILOAD × (RDSON,PFET + RINDUCTOR) + VOUT, with RDSON,PFET = 390 mΩ (typ.) in the WSON package.
How does the LM3370SDX-3013/NOPB manage electromagnetic interference (EMI)?
The LM3370SDX-3013/NOPB reduces EMI through three integrated techniques: (1) 180° out-of-phase switching of its dual bucks to cancel input ripple current, (2) selectable spread-spectrum modulation (via I²C) that dithers the 2 MHz switching frequency ±100 kHz, and (3) internal synchronous rectification eliminating high-dv/dt diode reverse recovery noise. These features collectively lower peak radiated emissions by up to 10 dB compared to conventional fixed-frequency converters.
Can the LM3370SDX-3013/NOPB be used with different inductor and capacitor values than the typical 2.2 µH / 4.7 µF / 10 µF?
Yes, the LM3370SDX-3013/NOPB supports alternative passive components, but stability and transient response must be verified. The 2.2 µH inductor is optimized for 2 MHz operation; using a 1.0 µH part increases switching frequency and may exceed safe peak currents. Input capacitance below 4.7 µF risks violating input voltage ripple limits (<50 mV), while output capacitance below 10 µF degrades load-step response. TI's WEBENCH® design tool validates custom LC selections for the LM3370SDX-3013/NOPB.
What is the function of the nPOR1 and nPOR2 pins on the LM3370SDX-3013/NOPB?
The nPOR1 and nPOR2 pins on the LM3370SDX-3013/NOPB are open-drain power-on-reset outputs that assert low when their respective output voltage falls below 92% of the target (e.g., <1.104 V for VOUT1 = 1.2 V). They provide hardware reset signaling to microcontrollers or FPGAs, with a default 50 ms delay after startup. Each pin requires a 100 kΩ pull-up resistor and can be pre-trimmed to 50 µs, 100 ms, or 200 ms delay via I²C register configuration-enabling precise power sequencing in complex systems.
LM3370SDX-3013/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 1.2V, 2.5V
- 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:
- 16-WSON (5x4)
LM3370SDX-3013/NOPB FAQ
1.How can I place an order for LM3370SDX-3013/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3370SDX-3013/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 LM3370SDX-3013/NOPB reliable?
The price and inventory of LM3370SDX-3013/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3370SDX-3013/NOPB is usually 5 days.
3.What payment methods are accepted for LM3370SDX-3013/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3370SDX-3013/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3370SDX-3013/NOPB?
LM3370SDX-3013/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3370SDX-3013/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 LM3370SDX-3013/NOPB?
For technical support, including LM3370SDX-3013/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3370SDX-3013/NOPB requirements.
6.How does Aetrix verify that LM3370SDX-3013/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3370SDX-3013/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 LM3370SDX-3013/NOPB meets industry standards.
7.What is the process for return or replacement of LM3370SDX-3013/NOPB?
All LM3370SDX-3013/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3370SDX-3013/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 LM3370SDX-3013/NOPB part is unused and in its original packaging.
Return procedure for LM3370SDX-3013/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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