My Inquiry
My Account
Texas Instruments LM3370SDX-3416/NOPB
- Part No.:
- LM3370SDX-3416/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM3370SDX-3416/NOPB.pdf
- Description:
- IC REG BUCK 1.4V/2.8V DL 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,097
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3370SDX-3416/NOPB from Texas Instruments is a dual synchronous step-down DC-DC converter with I²C-controlled dynamic voltage scaling, delivering 600 mA per channel at fixed output voltages of 1.4 V (VOUT1) and 2.8 V (VOUT2), operating from 2.7 V to 5.5 V input, and optimized for baseband and application processor power in portable Li-ion-powered systems.
For engineers reviewing the LM3370SDX-3416/NOPB datasheet, LM3370SDX-3416/NOPB pinout, LM3370SDX-3416/NOPB application, or LM3370SDX-3416/NOPB equivalent, key selection considerations include I²C-programmable mode control (PFM/PWM/forced PWM), spread-spectrum noise reduction, 180° out-of-phase switching for input ripple suppression, and integrated synchronous rectification enabling >90% efficiency at 600 mA load.
Technical Context
The LM3370SDX-3416/NOPB implements voltage-mode control with input-voltage feed-forward for stable regulation across 2.7–5.5 V input. Its dual buck architecture operates with 180° phase offset to reduce input capacitor RMS current and suppress surge transients.
Each channel features independent enable (EN1/EN2), analog feedback (FB1/FB2), open-drain power-on-reset (nPOR1/nPOR2), and I²C interface (SCL/SDA) supporting 400 kHz clock for real-time VOUT adjustment, mode selection, and spread-spectrum activation - all without external components beyond 2.2 µH inductors and 4.7 µF/10 µF capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Set | VOUT1 = 1.4 V, VOUT2 = 2.8 V - factory-trimmed fixed outputs; no external resistor divider required |
| Max Output Current | 600 mA per channel - supports sustained full-load operation with thermal derating on 4-layer PCB |
| Switching Frequency | 2 MHz (typ.) - enables use of compact 2.2 µH shielded inductors and low-ESR ceramic capacitors |
| I²C Interface | 400 kHz standard-mode - allows dynamic VOUT stepping (50 mV/100 mV), PFM/PWM mode forcing, and spread-spectrum enable |
| Efficiency | >90% at 600 mA (VIN = 3.6 V, VOUT1 = 1.4 V) - achieved via internal synchronous PFET/NFET rectification |
| Quiescent Current | 34 µA (PFM mode, both channels active) - extends battery life in standby states for portable devices |
| Thermal Resistance | θJA = 26 °C/W (WSON-16 package) - requires minimum 4-layer PCB with thermal vias for full 600 mA per channel |
Pinout & Package
The LM3370SDX-3416/NOPB is packaged in a 4 mm × 5 mm × 0.8 mm, 16-lead WSON (NHR0016B) with exposed thermal pad. Pin numbering follows standard counter-clockwise layout from top-left corner (Pin 1 = VIN2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN2 | Buck 2 input supply | Accepts 2.7–5.5 V; must be ≥ VOUT2 + 1 V for regulation; connects to PFET/NFET switch node |
| SW2 | Buck 2 switch node | Drives external 2.2 µH inductor; high dv/dt node requiring tight layout and ground shielding |
| PGND2 | Buck 2 power ground | High-current return path for Buck 2; must be isolated from SGND and connected directly to thermal pad |
| VDD | Signal supply rail | Must be ≥ max(VIN1, VIN2); powers internal logic, POR, and I²C interface; decouple with 0.1 µF |
| SGND | Signal ground reference | Analog and digital reference for FB, SDA, SCL, EN, nPOR; connect to PGND only at single point near VDD decoupling |
| PGND1 | Buck 1 power ground | High-current return path for Buck 1; separate from PGND2 to minimize cross-channel coupling |
| SW1 | Buck 1 switch node | Drives external 2.2 µH inductor; 180° out-of-phase with SW2 to reduce input ripple |
| VIN1 | Buck 1 input supply | Accepts 2.7–5.5 V; must be ≥ VOUT1 + 1 V; independent of VIN2 for flexible rail sourcing |
| FB1 | Buck 1 feedback input | Monitors VOUT1 via resistive divider (not required for fixed-output LM3370SDX-3416/NOPB) |
| SDA | I²C data line | Open-drain; requires 2 kΩ pull-up to VDD; supports read/write of 8-bit register map for VOUT, mode, spread-spectrum |
| SCL | I²C clock line | Open-drain; requires 2 kΩ pull-up to VDD; 400 kHz max frequency; synchronizes all I²C transactions |
| nPOR1 | Buck 1 power-on reset | Open-drain active-low; asserts when VOUT1 < 94% of target; requires 100 kΩ pull-up for system sequencing |
| nPOR2 | Buck 2 power-on reset | Open-drain active-low; asserts when VOUT2 < 94% of target; independent timing enables staggered startup |
| EN1 | Buck 1 enable | Active-high logic input; controls Buck 1 startup/shutdown; overrides I²C mode commands when asserted |
| EN2 | Buck 2 enable | Active-high logic input; controls Buck 2 startup/shutdown; enables independent power sequencing |
| FB2 | Buck 2 feedback input | Monitors VOUT2; internal resistor divider sets 2.8 V; no external components needed for LM3370SDX-3416/NOPB |
Key Features
| Feature | Design Value |
|---|---|
| I²C-controlled dynamic voltage scaling | Enables real-time VOUT1 (1.0–2.0 V in 50 mV steps) and VOUT2 (1.8–3.3 V in 100 mV steps) adjustment for processor DVFS without hardware changes |
| Automatic PFM/PWM mode switching | Maintains >85% efficiency from 100 µA to 600 mA load per channel by selecting optimal switching strategy based on instantaneous current demand |
| 180° out-of-phase buck timing | Reduces input capacitor RMS current by ~30% and minimizes peak input surge, lowering required CIN rating and EMI filtering burden |
| Integrated synchronous rectification | Eliminates external Schottky diodes; achieves 90%+ efficiency at 600 mA with internal 390 mΩ PFET and 240 mΩ NFET (WSON package) |
| Spread-spectrum modulation | Reduces peak EMI by ±10% frequency dithering around 2 MHz center; configurable via I²C to meet Class B radiated emissions limits |
| Independent power-on-reset outputs | nPOR1/nPOR2 provide sequenced system reset signals with 94% threshold detection and programmable delay (50 µs–200 ms) for safe SoC boot |
Applications
| Baseband Processor Power | Application Processor Core Supply |
|---|---|
Use Scenario: Powers ARM9/ARM11 baseband processors in 3G/4G smartphones requiring dual-rail, low-noise, dynamically scalable supplies. IC Role / Device Role / Timing Role: Dual-buck regulator providing independent 1.4 V (core) and 2.8 V (I/O) rails with I²C-controlled voltage scaling during sleep/active transitions. Use Value: Enables 30% reduction in system standby current via PFM mode and eliminates need for discrete LDO post-regulation stages. | Use Scenario: Supplies video/audio application processors (e.g., TI OMAP, Qualcomm Snapdragon) with tightly regulated core and memory I/O voltages. IC Role / Device Role / Timing Role: Synchronous step-down converter delivering 600 mA at 1.4 V and 2.8 V with 180° phase shift to minimize input ripple affecting sensitive analog blocks. Use Value: Achieves <15 mVpp output ripple and <50 µVrms noise floor, meeting processor AVS and PLL jitter requirements. |
| FPGA/CPLD Core & I/O Rails | Li-ion-Powered Industrial Sensor Hub |
Use Scenario: Powers Xilinx Spartan or Intel MAX 10 FPGA with separate core (1.2 V) and I/O (2.5/3.3 V) supplies in space-constrained edge nodes. IC Role / Device Role / Timing Role: Dual-channel DC-DC converter configured as 1.4 V core and 2.8 V I/O supply, supporting fast I²C-based reconfiguration during partial reconfiguration cycles. Use Value: Reduces total solution size by 40% vs. two discrete converters and enables dynamic I/O voltage adaptation for multi-standard communication interfaces. | Use Scenario: Powers ultra-low-power sensor fusion hubs (MCU + IMU + BLE) operating from single-cell Li-ion (3.0–4.2 V) with multi-year battery life. IC Role / Device Role / Timing Role: High-efficiency dual buck supplying MCU core (1.4 V) and wireless transceiver I/O (2.8 V), with automatic PFM entry below 100 µA load. Use Value: Extends battery runtime to >3 years in periodic wake-up mode (10 s active / 300 s sleep) due to 34 µA quiescent current in dual-channel PFM. |
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 / 2.8 V outputs; 3 MHz switching; no I²C interface; uses external compensation | Lacks dynamic voltage scaling and spread-spectrum; suited for cost-sensitive, static-rail designs | Select when I²C control is unnecessary and higher switching frequency justifies smaller inductors |
| RT8059NGQW | 1.0–3.3 V adjustable outputs via resistors; 2.5 MHz; I²C-compatible but no spread-spectrum; 800 mA per channel | Requires external feedback resistors; lacks POR outputs and 180° phase offset; higher max current | Select when adjustable outputs and higher current are prioritized over integrated sequencing and EMI reduction |
Compared with TPS62400DRVR and RT8059NGQW, the LM3370SDX-3416/NOPB uniquely combines factory-trimmed dual fixed outputs, integrated POR signaling, 180° phase alignment, and I²C-accessible spread-spectrum - making it optimal for portable SoC power where board area, EMI compliance, and firmware-controlled voltage agility are critical.
Availability
LM3370SDX-3416/NOPB is available at Aetrix Electronics and suitable for portable consumer electronics, industrial sensor nodes, and embedded communications equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability for ISO 13485 and IATF 16949 programs.
Supply support for LM3370SDX-3416/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 battery-powered systems.
The LM3370 product line was designed specifically for ultra-low-voltage, multi-rail power delivery in mobile baseband and application processors - emphasizing I²C configurability, minimal external component count, and robust thermal performance in leadless packages.
FAQ
What are the fixed output voltages of the LM3370SDX-3416/NOPB?
The LM3370SDX-3416/NOPB is factory-configured with fixed output voltages of 1.4 V on VOUT1 and 2.8 V on VOUT2. These values are laser-trimmed during production and do not require external feedback resistors. The part number suffix "3416" explicitly denotes this voltage combination per TI's ordering matrix, and the /NOPB suffix confirms lead-free, RoHS-compliant packaging.
Does the LM3370SDX-3416/NOPB support I²C communication, and what functions does it enable?
Yes, the LM3370SDX-3416/NOPB supports standard-mode I²C (400 kHz) via dedicated SDA and SCL pins. This interface enables dynamic control of output voltages (within family ranges), forced PWM mode activation, automatic PFM/PWM mode selection, and spread-spectrum modulation for EMI reduction - all without requiring external microcontroller firmware changes.
What package type and thermal characteristics apply to the LM3370SDX-3416/NOPB?
The LM3370SDX-3416/NOPB uses the 16-lead WSON package (4 mm × 5 mm × 0.8 mm, NHR0016B) with θJA = 26 °C/W on a 4-layer PCB. Its exposed thermal pad must be soldered to a solid copper pour with ≥4 thermal vias to sustain 600 mA per channel continuously at ambient temperatures up to +85°C.
How does the LM3370SDX-3416/NOPB handle power sequencing and system reset?
The LM3370SDX-3416/NOPB provides independent open-drain nPOR1 and nPOR2 signals that assert low when their respective outputs fall below 94% of target voltage. Each POR output requires a 100 kΩ pull-up and supports programmable delay (50 µs–200 ms), enabling precise power-up sequencing for SoCs with strict rail-ordering requirements.
Can the LM3370SDX-3416/NOPB operate from a single Li-ion cell, and what is the minimum input voltage?
Yes, the LM3370SDX-3416/NOPB operates from 2.7 V to 5.5 V, fully supporting single-cell Li-ion (2.7–4.2 V). For VOUT1 = 1.4 V, the minimum VIN is ~1.55 V (calculated as VOUT + ILOAD × (RDS_ON_PFET + RINDUCTOR)), but the device enforces 2.7 V UVLO - ensuring reliable start-up above battery depletion thresholds.
LM3370SDX-3416/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- 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):
- 1.4V, 2.8V
- 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:
- 16-WSON (5x4)
LM3370SDX-3416/NOPB FAQ
1.How can I place an order for LM3370SDX-3416/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3370SDX-3416/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-3416/NOPB reliable?
The price and inventory of LM3370SDX-3416/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-3416/NOPB is usually 5 days.
3.What payment methods are accepted for LM3370SDX-3416/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3370SDX-3416/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3370SDX-3416/NOPB?
LM3370SDX-3416/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3370SDX-3416/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-3416/NOPB?
For technical support, including LM3370SDX-3416/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3370SDX-3416/NOPB requirements.
6.How does Aetrix verify that LM3370SDX-3416/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3370SDX-3416/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-3416/NOPB meets industry standards.
7.What is the process for return or replacement of LM3370SDX-3416/NOPB?
All LM3370SDX-3416/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3370SDX-3416/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-3416/NOPB part is unused and in its original packaging.
Return procedure for LM3370SDX-3416/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3370SDX-3416/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
