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Texas Instruments LM3370SD-3021/NOPB
- Part No.:
- LM3370SD-3021/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM3370SD-3021/NOPB.pdf
- Description:
- IC REG BUCK 1.2V/3.3V DL 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:999
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Product details
Overview
LM3370SD-3021/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 1.2 V (VOUT1) and 3.3 V (VOUT2), operating from 2.7 V to 5.5 V input, and optimized for baseband and application processor power in portable systems.
For engineers reviewing the LM3370SD-3021/NOPB datasheet, LM3370SD-3021/NOPB pinout, LM3370SD-3021/NOPB application, or LM3370SD-3021/NOPB equivalent, key selection factors include I²C programmability, 2 MHz fixed-frequency PWM operation, 180° out-of-phase buck timing for input ripple reduction, spread spectrum capability, and integrated synchronous rectification for high efficiency at low output voltages.
Technical Context
The LM3370SD-3021/NOPB implements two independent voltage-mode synchronous buck regulators sharing a common 2 MHz oscillator, with 180° phase offset to minimize input capacitor RMS current. Each channel features automatic PFM/PWM mode switching based on load, with forced PWM mode selectable via I²C.
Its I²C interface supports dynamic VOUT1 (1.0–2.0 V in 50 mV steps) and VOUT2 (1.8–3.3 V in 100 mV steps) reconfiguration, spread spectrum modulation for EMI reduction, and enable/control of auto mode, while internal soft-start, POR monitoring (92% threshold), and thermal shutdown ensure robust power sequencing and protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Set | VOUT1 = 1.2 V, VOUT2 = 3.3 V - factory-trimmed fixed outputs; no external resistor divider required |
| Max Output Current | 600 mA per channel - supports sustained loads typical of baseband processors and FPGA I/O banks |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single Li-ion, 3-cell NiMH/NiCd, or fixed 3.3 V/5 V rails |
| Switching Frequency | 2 MHz (typ.) - enables use of compact 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors |
| I²C Interface | 400 kHz standard-mode - allows real-time dynamic voltage scaling and noise-reduction control without MCU GPIO overhead |
| Efficiency Peak | ≥90% at ≥70 mA load - achieved via internal synchronous rectification (PFET + NFET) eliminating external diode losses |
| Thermal Protection | Thermal shutdown at TJ = 150°C (typ.), recovery at 140°C - prevents permanent damage during overload or poor PCB thermal design |
Pinout & Package
The LM3370SD-3021/NOPB is packaged in a 4 mm × 5 mm × 0.8 mm, 16-lead WSON (non-pullback) package (TI package code NHR0016B), with exposed thermal pad for enhanced heat dissipation. Pinout is validated per TI SNVS406N Rev. May 2013 datasheet Figure 1 and PIN DESCRIPTIONS table.
| Pin/Terminal | 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; requires low-inductance layout to minimize switching loss |
| PGND2 | Buck 2 power ground | Separate return path for Buck 2 high-current switching loop; must be tied to PGND1 near thermal pad |
| VDD | Signal supply | Must be ≥ max(VIN1, VIN2); powers internal logic, POR, and I²C interface |
| SGND | Signal ground | Reference for FB, EN, SDA, SCL, nPOR; isolated from PGND to reduce noise coupling |
| PGND1 | Buck 1 power ground | Separate return path for Buck 1 high-current switching loop; connects to thermal pad |
| SW1 | Buck 1 switch node | Connects to inductor and output filter; 180° out-of-phase with SW2 to reduce input ripple |
| VIN1 | Buck 1 input supply | Accepts 2.7–5.5 V; powers PFET/NFET switches for first regulator channel |
| FB1 | Buck 1 feedback input | Monitors VOUT1 via internal 1.2 V reference; open for fixed 1.2 V output (LM3370SD-3021/NOPB) |
| SDA | I²C data line | Open-drain, requires 2 kΩ pull-up to VDD; supports bidirectional communication for VOUT/Vmode control |
| SCL | I²C clock line | Open-drain, requires 2 kΩ pull-up to VDD; synchronizes data transfer at up to 400 kHz |
| nPOR1 | Buck 1 power-on reset | Open-drain active-low signal asserting when VOUT1 < 92% of target; requires 100 kΩ pull-up |
| nPOR2 | Buck 2 power-on reset | Open-drain active-low signal asserting when VOUT2 < 92% of target; requires 100 kΩ pull-up |
| EN1 | Buck 1 enable | Active-high logic input; controls startup/shutdown sequencing independently of EN2 |
| EN2 | Buck 2 enable | Active-high logic input; enables independent power sequencing for multi-rail systems |
| FB2 | Buck 2 feedback input | Monitors VOUT2 via internal reference; open for fixed 3.3 V output (LM3370SD-3021/NOPB) |
Key Features
| Feature | Design Value |
|---|---|
| I²C-controlled dynamic voltage scaling | Enables runtime adjustment of VOUT1 (1.0–2.0 V) and VOUT2 (1.8–3.3 V) to match processor DVFS states, reducing system power by >30% under light load |
| 180° out-of-phase buck timing | Reduces input capacitor RMS current by ~30% versus in-phase operation, allowing smaller CIN (4.7 µF) and lower board area |
| Spread spectrum modulation | Lowers peak EMI by spreading switching energy across 2 MHz ±100 kHz band, easing FCC/CE compliance without added shielding |
| Internal synchronous rectification | Eliminates external Schottky diodes; achieves >90% efficiency at 1.2 V/600 mA with only 2.2 µH inductor and 10 µF COUT |
| Independent enable and POR signals | EN1/EN2 allow precise power-up/down sequencing; nPOR1/nPOR2 provide fault-aware system reset assertion for each rail |
| Auto PFM/PWM mode switching | Maintains >85% efficiency down to 1 mA load via ultra-low IQ_PFM (34 µA typ.), extending battery life in standby modes |
Applications
| Baseband Processor Core Power | Application Processor I/O Supply |
|---|---|
Use Scenario: Powers ARM9/ARM11 core voltage (VDD_CORE) in cellular handsets and feature phones requiring 1.2 V @ 600 mA with tight transient response. IC Role / Device Role / Timing Role: Dual-buck regulator providing tightly regulated, low-noise 1.2 V core rail with independent sequencing and POR monitoring. Use Value: Enables dynamic voltage scaling via I²C to match CPU frequency steps, reducing average core power by up to 40% during mixed-workload operation. | Use Scenario: Supplies 3.3 V I/O voltage (VDD_IO) for application processors interfacing with SDIO, UART, and GPIO peripherals in portable media devices. IC Role / Device Role / Timing Role: Second buck channel delivering stable 3.3 V at up to 600 mA with 180° phase offset to minimize shared input rail ripple. Use Value: Eliminates need for discrete LDO or second IC; 2 MHz switching allows use of tiny 0805 MLCCs, saving >15 mm² PCB area versus 500 kHz solutions. |
| FPGA Configuration & I/O Banks | Multi-Rail Portable System Power |
Use Scenario: Provides dedicated 1.2 V configuration voltage (VCCAUX) and 3.3 V I/O bank voltage (VCCO) for Spartan-3/Artix-7 FPGAs in handheld test equipment. IC Role / Device Role / Timing Role: Dual-output converter supporting simultaneous FPGA power-up with controlled ramp rates and independent POR assertion per rail. Use Value: Replaces two discrete converters; built-in soft-start and 92% POR threshold prevent configuration failure due to undershoot during cold start. | Use Scenario: Central power management IC for Bluetooth/Wi-Fi combo modules requiring separate 1.2 V RF core and 3.3 V digital interface supplies from a single Li-ion cell. IC Role / Device Role / Timing Role: Single-chip dual buck solution accepting 2.7–5.5 V input and delivering two independent, sequenced, and monitored outputs. Use Value: Reduces BOM count by 3+ components (vs. discrete bucks + POR ICs); spread spectrum lowers conducted EMI below CISPR-22 Class B limits without ferrite beads. |
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 |
|---|---|---|---|
| TPS62231DRYT | Single-channel, 600 mA, 2.25–6.5 V input, fixed 1.2 V output; no I²C, no second channel | Requires two units for dual-rail support; lacks dynamic voltage scaling and spread spectrum | Choose only if system needs only one 1.2 V rail and space permits dual IC placement |
| LM3671MF-33 | Single-channel, 600 mA, 2.5–5.5 V input, fixed 3.3 V output; no I²C, no second channel, no POR | Cannot replace dual-rail functionality; no power sequencing or rail monitoring capability | Select only for cost-sensitive single-rail 3.3 V applications where sequencing and diagnostics are not required |
Compared with TPS62231DRYT and LM3671MF-33, the LM3370SD-3021/NOPB uniquely integrates two synchronized, I²C-controllable bucks with POR, spread spectrum, and 180° phase offset-enabling single-chip dual-rail power with EMI control and dynamic scaling unattainable using single-channel alternatives.
Availability
LM3370SD-3021/NOPB is available at Aetrix Electronics and suitable for baseband processor core power, application processor I/O supply, FPGA configuration, and multi-rail portable system power requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3370SD-3021/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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM3370 belongs to TI's portable power management portfolio, designed specifically for ultra-low-voltage, high-efficiency dual-rail power in battery-powered handheld devices with complex DVFS and EMI requirements.
FAQ
What output voltages does the LM3370SD-3021/NOPB deliver?
The LM3370SD-3021/NOPB delivers factory-configured fixed outputs: VOUT1 = 1.2 V and VOUT2 = 3.3 V. These values are trimmed during production and do not require external feedback resistors. The I²C interface allows dynamic reprogramming of both outputs within their respective ranges (1.0–2.0 V and 1.8–3.3 V), but the LM3370SD-3021/NOPB variant defaults to and is specified for the 1.2 V / 3.3 V combination.
Does the LM3370SD-3021/NOPB support independent power sequencing?
Yes, the LM3370SD-3021/NOPB supports independent sequencing via dedicated EN1 and EN2 pins, allowing staggered startup or shutdown of each buck channel. Additionally, nPOR1 and nPOR2 provide open-drain reset signals that assert low when their respective output falls below 92% of target, enabling system-level fault detection and safe processor reset-critical for reliable boot in multi-rail portable systems using the LM3370SD-3021/NOPB.
Can the LM3370SD-3021/NOPB operate from a single Li-ion battery?
Yes, the LM3370SD-3021/NOPB operates over an input range of 2.7 V to 5.5 V, fully covering the discharge curve of a single Li-ion cell (typically 4.2 V fully charged down to ~2.8 V). Its ability to operate at 100% duty cycle ensures regulation of 1.2 V output even as input drops near 2.7 V, making it suitable for direct connection to Li-ion without pre-regulation-confirmed in TI's SNVS406N datasheet Section "Operating Ratings" and "LDO – Low Drop Out Operation".
What package type is used for the LM3370SD-3021/NOPB?
The LM3370SD-3021/NOPB uses the 16-lead WSON package (4 mm × 5 mm × 0.8 mm, TI package code NHR0016B) with an exposed thermal pad. This thermally enhanced leadless package provides θJA = 26°C/W on a 4-layer board, enabling high-power-density layouts in space-constrained portable designs. The DSBGA variant (e.g., LM3370TL-3022/NOPB) is not used for the -SD suffix part number.
How does the LM3370SD-3021/NOPB reduce electromagnetic interference?
The LM3370SD-3021/NOPB reduces EMI through three integrated methods: (1) 180° out-of-phase switching of its two buck channels, lowering input capacitor ripple current; (2) programmable spread spectrum modulation (via I²C) that dithers the 2 MHz switching frequency; and (3) internal synchronous rectification eliminating high-dI/dt diode reverse-recovery noise. These features collectively suppress peak radiated emissions, easing compliance with FCC Part 15 and CE EN 55022 standards without external filtering-verified in TI's SNVS406N Figure 33 and Section "Spread Spectrum Capability".
LM3370SD-3021/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, 3.3V
- 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)
LM3370SD-3021/NOPB FAQ
1.How can I place an order for LM3370SD-3021/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3370SD-3021/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 LM3370SD-3021/NOPB reliable?
The price and inventory of LM3370SD-3021/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3370SD-3021/NOPB is usually 5 days.
3.What payment methods are accepted for LM3370SD-3021/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3370SD-3021/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3370SD-3021/NOPB?
LM3370SD-3021/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3370SD-3021/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 LM3370SD-3021/NOPB?
For technical support, including LM3370SD-3021/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3370SD-3021/NOPB requirements.
6.How does Aetrix verify that LM3370SD-3021/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3370SD-3021/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 LM3370SD-3021/NOPB meets industry standards.
7.What is the process for return or replacement of LM3370SD-3021/NOPB?
All LM3370SD-3021/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3370SD-3021/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 LM3370SD-3021/NOPB part is unused and in its original packaging.
Return procedure for LM3370SD-3021/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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