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Texas Instruments LM3370SDX-3021/NOPB
- Part No.:
- LM3370SDX-3021/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM3370SDX-3021/NOPB.pdf
- Description:
- IC REG BUCK 1.2V/3.3V DL 16WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3370SDX-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 VOUT1 = 1.2 V and VOUT2 = 3.3 V. It operates from 2.7 V to 5.5 V input, features 2 MHz fixed-frequency PWM, 180° out-of-phase switching, and internal synchronous rectification for high efficiency in space-constrained portable systems.
For engineers reviewing the LM3370SDX-3021/NOPB datasheet, LM3370SDX-3021/NOPB pinout, LM3370SDX-3021/NOPB application, or LM3370SDX-3021/NOPB equivalent, key selection criteria include I²C programmability of output voltages, spread-spectrum noise reduction capability, automatic PFM/PWM mode transition, and thermal performance in WSON-16 (θJA = 26°C/W) and DSBGA-20 packages.
Technical Context
The LM3370SDX-3021/NOPB implements voltage-mode control with input-voltage feed-forward for stable line regulation across its 2.7 V–5.5 V input range. Its dual buck architecture uses independent feedback loops (FB1/FB2), 180° phase-shifted switching, and integrated PFET/NFET power stages with RDS(ON) values of 390/240 mΩ (WSON) to minimize conduction loss and input surge current.
I²C interface enables real-time configuration of VOUT1 (1.0–2.0 V in 50 mV steps) and VOUT2 (1.8–3.3 V in 100 mV steps), spread-spectrum modulation, forced PWM mode, and POR threshold trimming. Power-on-reset outputs (nPOR1/nPOR2) assert low when respective outputs fall below 94% (rising) or 85% (falling) of target voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Setpoints | VOUT1 = 1.2 V, VOUT2 = 3.3 V - factory-trimmed fixed outputs enabling immediate use without external resistor dividers |
| Max Output Current | 600 mA per channel - supports baseband/application processors and FPGA I/O rails without external current boosting |
| Switching Frequency | 2.0 MHz (typ.) - allows use of compact 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors for minimal PCB footprint |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single Li-ion, 3-cell NiMH/NiCd, and fixed 3.3 V/5 V rails |
| I²C Interface Speed | 400 kHz - supports fast dynamic voltage scaling during processor DVFS transitions |
| Thermal Resistance (WSON) | θJA = 26°C/W - enables 1538 mW power dissipation at TA = 60°C on standard 4-layer FR-4 board |
| Quiescent Current (PFM) | 34 µA - maintains >85% efficiency at light loads (<10 mA) for battery longevity |
Pinout & Package
The LM3370SDX-3021/NOPB is packaged in a 4 mm × 5 mm × 0.8 mm, 16-lead non-pullback WSON (package code NHR0016B), optimized for thermal performance and high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN2 | Buck 2 input supply | Accepts 2.7–5.5 V; must be ≥ VOUT2 + 1 V for full-load operation at 3.3 V |
| SW2 | Buck 2 switch node | Connects to 2.2 µH inductor and PGND2; requires low-inductance layout to minimize EMI |
| PGND2 | Buck 2 power ground | Separate return path for Buck 2 high-current loop; must be isolated from SGND to reduce noise coupling |
| VDD | Signal supply | Must be ≥ max(VIN1, VIN2); powers internal logic, I²C interface, and POR circuitry |
| SGND | Signal ground | Reference for FB1/FB2, SDA/SCL, EN1/EN2, and nPOR1/nPOR2; connects to system analog ground plane |
| PGND1 | Buck 1 power ground | Separate return path for Buck 1 high-current loop; ties to CIN1/COUT1 ground pads |
| SW1 | Buck 1 switch node | Connects to 2.2 µH inductor and PGND1; 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 for full-load operation at 1.2 V |
| FB1 | Buck 1 feedback input | Monitors VOUT1 via resistive divider; internal reference = 0.6 V (VFB tolerance ±3.5%) |
| SDA | I²C data line | Open-drain; requires 2 kΩ pull-up to VDD for 400 kHz operation and noise immunity |
| SCL | I²C clock line | Open-drain; requires 2 kΩ pull-up to VDD; timing compliant with standard-mode I²C spec |
| nPOR1 | Buck 1 power-on reset | Open-drain active-low output; asserts when VOUT1 < 94% of target during startup or < 85% during operation |
| nPOR2 | Buck 2 power-on reset | Open-drain active-low output; asserts when VOUT2 < 94% of target during startup or < 85% during operation |
| EN1 | Buck 1 enable | Active-high logic input; 1.0 V min VIH ensures reliable turn-on from 1.8 V GPIO |
| EN2 | Buck 2 enable | Active-high logic input; 0.4 V max VIL ensures robust noise margin in noisy environments |
| FB2 | Buck 2 feedback input | Monitors VOUT2 via resistive divider; same internal reference and tolerance as FB1 |
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, reducing system power by up to 40% |
| Automatic PFM/PWM mode switching | Maintains >85% efficiency from 100 µA to 600 mA load per channel without external mode control logic |
| Spread-spectrum modulation | Reduces peak EMI by >10 dB across 100 kHz–10 MHz band, easing FCC/CE compliance for handheld devices |
| 180° out-of-phase buck operation | Cuts input capacitor RMS current by ~30%, allowing smaller 4.7 µF ceramic input capacitors instead of larger tantalum units |
| Internal soft-start | Prevents inrush current spikes during power-up; limits dV/dt on VOUT1/VOUT2 to < 1 V/ms for clean rail sequencing |
| Independent power-on-reset outputs | Provides sequenced system reset signals (nPOR1/nPOR2) with user-selectable thresholds (70%/85%/94%) for reliable SoC initialization |
Applications
| Baseband Processor Power | Application Processor I/O Supply |
|---|---|
Use Scenario: Powering ARM-based baseband ICs (e.g., Qualcomm MDM series) requiring dual-rail DVFS support with tight voltage accuracy. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator providing dynamically scaled core (1.2 V) and I/O (3.3 V) supplies under I²C command from PMIC or host processor. Use Value: Enables 30% lower active power vs. fixed-output converters by matching voltage to instantaneous processing load, extending battery life in LTE modems. | Use Scenario: Delivering regulated I/O voltage to application processors (e.g., TI OMAP, NXP i.MX) with multiple voltage domains and strict sequencing requirements. IC Role / Device Role / Timing Role: Primary I/O rail generator with independent EN1/EN2 control and nPOR1/nPOR2 reset signaling for safe boot and state transitions. Use Value: Eliminates need for external reset supervisors and discrete MOSFETs in power sequencing, reducing BOM count by 4 components per rail. |
| FPGA Core & I/O Power | Portable Audio Codec Supply |
Use Scenario: Supplying core (1.2 V) and bank-specific I/O (3.3 V) rails to Xilinx Spartan or Intel Cyclone FPGAs in battery-powered test equipment. IC Role / Device Role / Timing Role: Dual-output DC-DC converter with 180° phase shift minimizing input ripple, supporting simultaneous core/I/O configuration during FPGA reconfiguration. Use Value: Reduces input capacitor size by 50% versus in-phase dual bucks, saving 12 mm² PCB area in compact form factors. | Use Scenario: Powering stereo audio codecs (e.g., TI PCM3002) in Bluetooth headsets requiring ultra-low-noise 3.3 V I/O and low-quiescent 1.2 V analog core supplies. IC Role / Device Role / Timing Role: Low-noise dual rail source using spread-spectrum mode and PFM operation to suppress switching artifacts in audio band (20 Hz–20 kHz). Use Value: Achieves < 10 µVrms output noise in PFM mode, meeting THD+N < −95 dB requirement for premium audio playback. |
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 |
|---|---|---|---|
| TPS62400DRVR | Fixed 1.2 V/2.8 V outputs; no I²C interface; 3 MHz switching frequency; 1.2 mm height WSON | Lacks dynamic voltage scaling; suited for cost-sensitive, static-voltage applications only | Select when I²C control is unnecessary and board height < 1.2 mm is critical |
| RT8070ZSP | 1.0 V/2.5 V fixed outputs; I²C-compatible but no spread spectrum; 1.5 MHz max frequency; QFN-16 package | Lower EMI mitigation capability; higher θJA (45°C/W) limits power density in compact designs | Select when lower BOM cost outweighs EMI performance and thermal constraints |
Compared with TPS62400DRVR and RT8070ZSP, the LM3370SDX-3021/NOPB uniquely combines factory-set 1.2 V/3.3 V outputs with full I²C programmability, spread-spectrum noise reduction, and superior thermal performance (26°C/W) - making it optimal for high-reliability portable systems requiring both flexibility and low EMI.
Availability
LM3370SDX-3021/NOPB is available at Aetrix Electronics and suitable for baseband processor power, FPGA I/O supply, portable audio codec supply, and application processor I/O supply requiring stable component supply and long-term production continuity.
Supply support for LM3370SDX-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 specializing in analog, embedded processing, and power management ICs, with over 50 years of innovation in energy-efficient power conversion.
The LM3370 product line delivers highly integrated dual-output DC-DC converters for portable electronics, designed specifically to meet the dynamic voltage scaling, low-noise, and space-constrained requirements of smartphones, tablets, and wearable devices.
FAQ
What output voltages does the LM3370SDX-3021/NOPB provide?
The LM3370SDX-3021/NOPB is factory-configured to deliver VOUT1 = 1.2 V and VOUT2 = 3.3 V. These fixed outputs eliminate the need for external feedback resistors while retaining full I²C programmability to adjust either output within their respective ranges (VOUT1: 1.0–2.0 V in 50 mV steps; VOUT2: 1.8–3.3 V in 100 mV steps). This dual-voltage capability makes the LM3370SDX-3021/NOPB ideal for powering core and I/O domains simultaneously.
Does the LM3370SDX-3021/NOPB support spread-spectrum modulation?
Yes, the LM3370SDX-3021/NOPB supports spread-spectrum modulation via its I²C interface to reduce electromagnetic interference (EMI) peaks. When enabled, this feature dithers the 2 MHz switching frequency across a defined bandwidth, lowering peak radiated emissions by >10 dB in the 100 kHz–10 MHz range. The LM3370SDX-3021/NOPB's spread-spectrum capability is confirmed in the SNVS406N datasheet Figure 33 and Table 3, making it suitable for FCC/CE-compliant portable designs where EMI margins are tight.
What package options are available for the LM3370SDX-3021/NOPB?
The LM3370SDX-3021/NOPB is offered exclusively in the 4 mm × 5 mm × 0.8 mm, 16-lead non-pullback WSON package (TI package code NHR0016B). While the LM3370 family also includes a 20-bump DSBGA variant, the SDX-3021/NOPB suffix specifically denotes the WSON-16 version. This package provides θJA = 26°C/W on a 4-layer board, enabling higher power density than the DSBGA alternative (θJA = 50°C/W), and is optimized for thermal performance in handheld applications.
How does the LM3370SDX-3021/NOPB handle light-load efficiency?
The LM3370SDX-3021/NOPB automatically transitions from PWM to PFM mode at light loads (<70 mA per channel), reducing quiescent current to 34 µA (typ.) and maintaining >85% efficiency down to 100 µA. In PFM mode, the device uses variable-frequency operation and zero-current detection to minimize switching losses. This behavior is intrinsic to the LM3370SDX-3021/NOPB's control architecture and requires no external configuration - ensuring optimal battery life in standby or low-activity states.
Can the LM3370SDX-3021/NOPB operate with a single Li-ion battery input?
Yes, the LM3370SDX-3021/NOPB is explicitly designed to operate from a single Li-ion battery (2.7 V–4.2 V nominal, up to 4.5 V fully charged). Its 2.7 V–5.5 V input range, 100% duty-cycle LDO mode, and low dropout capability ensure stable 1.2 V and 3.3 V outputs across the full battery discharge curve. The LM3370SDX-3021/NOPB datasheet highlights this use case in the "Applications" section and "Operating Ratings" table, confirming suitability for smartphones, wearables, and other single-cell portable systems.
LM3370SDX-3021/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):
- 1.2V, 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)
LM3370SDX-3021/NOPB FAQ
1.How can I place an order for LM3370SDX-3021/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3370SDX-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 LM3370SDX-3021/NOPB reliable?
The price and inventory of LM3370SDX-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 LM3370SDX-3021/NOPB is usually 5 days.
3.What payment methods are accepted for LM3370SDX-3021/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3370SDX-3021/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3370SDX-3021/NOPB?
LM3370SDX-3021/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3370SDX-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 LM3370SDX-3021/NOPB?
For technical support, including LM3370SDX-3021/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3370SDX-3021/NOPB requirements.
6.How does Aetrix verify that LM3370SDX-3021/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3370SDX-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 LM3370SDX-3021/NOPB meets industry standards.
7.What is the process for return or replacement of LM3370SDX-3021/NOPB?
All LM3370SDX-3021/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3370SDX-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 LM3370SDX-3021/NOPB part is unused and in its original packaging.
Return procedure for LM3370SDX-3021/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3370SDX-3021/NOPB Tags
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