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Texas Instruments LM8850URE/NOPB
- Part No.:
- LM8850URE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 9-XFBGA, DSBGA
- Datasheet:
-
LM8850URE/NOPB.pdf
- Description:
- IC REG BOOST PROG 1.35A 9DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,219
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Product details
Overview
LM8850URE/NOPB from Texas Instruments is a high-performance, synchronous step-up DC-DC converter optimized for supercapacitor-backed power rails in mobile devices. It delivers up to 1.0A load current with programmable output voltages from 3.6V to 5.7V, operates from a single Li-ion cell (2.3V–5.5V), and features I²C-controlled active voltage balancing (BAL pin), PGOOD signaling, and auto-mode (PFM/PWM) operation for ultra-low quiescent current (6µA typ.) - enabling flash LED, WiMAX, and audio amplifier power management.
For engineers reviewing the LM8850URE/NOPB datasheet, LM8850URE/NOPB pinout, LM8850URE/NOPB application, or LM8850URE/NOPB equivalent, this page provides verified technical context, exact pin functions, real-world design meaning of specifications, confirmed alternative options, and supply-ready procurement details - all grounded in TI's SNVS647C datasheet and official packaging documentation.
Technical Context
The LM8850URE/NOPB uses voltage-mode control with synchronous rectification and an internal 2.5 MHz oscillator to achieve high efficiency across light-to-heavy loads. Its auto-mode dynamically transitions between PFM (6µA IQ) and PWM (330µA IQ) based on load current - e.g., ~225 mA transition point at VIN = 3.6V, VOUT = 5.0V - while maintaining ±2.5% DC output voltage precision.
It integrates a dedicated BAL pin for active voltage balancing across dual-section supercapacitors (0.05F–1.0F), supports 3.4 MHz high-speed I²C for register configuration (output voltage, current limit, turn-on time, ripple), and includes true shutdown isolation (0.4µA ISHDN), overvoltage protection, and thermal shutdown at TJ = 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Programmable via I²C to eight discrete values: 3.6V, 3.9V, 4.2V, 4.5V, 4.7V, 5.0V (default), 5.3V, or 5.7V - enables precise rail matching for flash LED drivers or USB OTG compliance. |
| Max Load Current | 1.0A peak switch current limit (configurable via I²C: 530/740/1025/1500 mA) - supports high-pulse-power applications like camera flash without external current-sense resistors. |
| Quiescent Current | 6µA typical in PFM mode, 0.4µA in shutdown - extends battery life during standby in always-on mobile subsystems. |
| Switching Frequency | 2.5 MHz (typ.), ±10% variation - allows use of compact 1.0 µH inductors (2520 case) and 4.7 µF 0603 capacitors for minimal PCB footprint. |
| I²C Interface | High-speed mode up to 3.4 MHz; fixed slave address 0x60 - enables fast dynamic reconfiguration of VOUT, current limit, and startup timing without interrupting system operation. |
| Input Voltage Range | 2.3V to 5.5V - supports direct connection to single-cell Li-ion batteries across full discharge curve, including cold-temperature operation down to −40°C. |
| Package | DSBGA-9 (YPD0009), 1.58 mm × 1.62 mm × 0.35 mm, 0.5 mm pitch - ultra-thin chip-scale package suitable for space-constrained mobile PCBs with bottom-side thermal pad. |
Pinout & Package
LM8850URE/NOPB is housed in a 9-bump ultra-thin DSBGA package (package number YPD0009), measuring 1.58 mm × 1.62 mm × 0.35 mm with 0.5 mm ball pitch. The package features a bottom-side thermal pad for enhanced thermal dissipation (θJA = 70°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1: VIN | Power supply input | Accepts 2.3V–5.5V Li-ion input; requires local 4.7 µF ceramic capacitor for stability and low-ESR filtering. |
| A2: SW | Switching node | Internal connection to NFET switch and PFET synchronous rectifier; must be routed with short, low-inductance traces to minimize switching losses and EMI. |
| A3: GND | Ground reference | Primary analog/digital ground return; must be connected directly to thermal pad and low-impedance ground plane. |
| B1: SDA | I²C data line | Open-drain bidirectional data bus; requires 2 kΩ pull-up to VOUT or separate I/O rail - compatible with 3.4 MHz high-speed I²C. |
| B2: PG | Power good indicator | Active-high open-drain output asserting when VOUT ≥ 85% of programmed value - used for system power sequencing and fault monitoring. |
| B3: VOUT | Regulated output | Delivers stable boost voltage (3.6V–5.7V); connects to supercapacitor anode and load; requires 4.7 µF ceramic output capacitor. |
| C1: SCLK | I²C clock line | Input-only clock signal; requires 2 kΩ pull-up; timing compliant with standard and high-speed I²C modes per Philips specification. |
| C2: EN | Enable control | Logic-level enable: <0.4V = shutdown, >1.2V = active; must not float - tie to VOUT or microcontroller GPIO with defined state. |
| C3: BAL | Supercapacitor balancing | Provides VOUT/2 reference to balance voltage across two-series supercapacitor sections; enables active charge redistribution during charge/discharge cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-mode PFM/PWM transition | Reduces quiescent current to 6µA at light loads while maintaining regulation - extends battery runtime without sacrificing transient response at higher loads. |
| Internal active voltage balancing | Eliminates need for external balancing resistors or ICs by regulating BAL pin at VOUT/2 - ensures safe, reliable operation with 0.05F–1.0F supercapacitors in series configurations. |
| Four programmable turn-on times | 5/7.5/10/12.5 s ramp-up - limits inrush current into supercapacitor during startup, preventing input droop and protecting battery integrity. |
| True shutdown isolation | 0.4µA shutdown current with complete output disconnect - prevents reverse current leakage and preserves supercapacitor charge during system sleep. |
| ±2.5% DC output voltage precision | Guaranteed accuracy across temperature (−40°C to +125°C) and input range - ensures consistent performance for sensitive analog loads like audio amplifiers or RF front-ends. |
Applications
| Flash LED Power Supply | Mobile Phone Backup Rail |
|---|---|
|
Use Scenario: High-current, short-duration flash illumination in smartphone cameras requiring 5.0V–5.7V at up to 1.0A pulses. IC Role / Device Role / Timing Role: Step-up converter providing regulated boost rail from depleted Li-ion battery (as low as 2.7V) while managing supercapacitor energy storage and discharge timing. Use Value: Enables bright, consistent flash output even at end-of-battery-life; I²C programmability allows dynamic VOUT adjustment to match LED forward voltage drift. |
Use Scenario: Maintaining system power during brief battery removal or voltage sag in dual-battery or hot-swap mobile architectures. IC Role / Device Role / Timing Role: Supercapacitor charger and backup regulator that sustains critical logic rails (e.g., RTC, memory retention) during 100–500 ms brownouts. Use Value: Active BAL pin ensures balanced supercapacitor aging and longevity; auto-mode minimizes standby drain to extend backup duration beyond 24 hours. |
| WiMAX/4G Transmitter Power | USB OTG Host Power |
|
Use Scenario: Delivering clean, stable 5.0V power to WiMAX RF power amplifiers during burst transmission in portable hotspots. IC Role / Device Role / Timing Role: High-efficiency boost converter with low-noise PFM/PWM transition and tight line/load regulation (<1% deviation). Use Value: 2.5 MHz switching frequency suppresses noise in RF bands; ±2.5% VOUT tolerance meets WiMAX PA bias requirements without external trimming. |
Use Scenario: Providing 5.0V VBUS to USB peripherals (keyboards, storage) from a smartphone or tablet acting as OTG host. IC Role / Device Role / Timing Role: Programmable boost regulator with I²C-controlled current limiting and PGOOD handshake for safe peripheral enumeration. Use Value: Configurable ILIM (530–1500 mA) prevents overcurrent faults during peripheral attach; PGOOD signal synchronizes VBUS enable with USB stack readiness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61230ARNSR | Fixed 5.0V output; no I²C interface; 2.0A max load; 3.0 MHz switching; no BAL pin or supercapacitor support. | Suitable for simpler boost needs without active balancing or programmable VOUT - e.g., generic 5V rail generation where supercapacitor backup is unnecessary. | Select TPS61230ARNSR only if fixed-output, higher-current, and lower-cost are priorities - but verify absence of BAL and auto-mode does not compromise system reliability. |
| MAX8855ETA+ | Pin-compatible DSBGA-9; 3.6V–5.5V VOUT range; 1.2A max load; no I²C; fixed PFM/PWM; no BAL or PGOOD. | Designed for basic flash LED drive with integrated current regulation - lacks supercapacitor management, programmability, and precision voltage control. | Choose MAX8855ETA+ for cost-sensitive flash-only designs where I²C control, balancing, and wide VOUT range are not required. |
Compared with TPS61230ARNSR and MAX8855ETA+, the LM8850URE/NOPB uniquely combines I²C-programmable VOUT/current limit, active supercapacitor balancing, and auto-mode efficiency - making it irreplaceable for mobile systems requiring intelligent, adaptive backup power architecture.
Availability
LM8850URE/NOPB is available at Aetrix Electronics and suitable for flash LED drivers, mobile phone backup rails, WiMAX transmitter supplies, and USB OTG host power applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM8850URE/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 decades of expertise in high-efficiency DC-DC conversion and mobile power solutions.
The LM8850URE/NOPB belongs to TI's high-performance boost converter product line, designed specifically for supercapacitor-backed power architectures in space-constrained, battery-operated mobile devices demanding dynamic voltage control and ultra-low quiescent current.
FAQ
What is the function of the BAL pin on the LM8850URE/NOPB?
The BAL pin on the LM8850URE/NOPB provides an internal VOUT/2 reference voltage to actively balance charge across two-series supercapacitor sections. It enables precise voltage equalization without external components, ensuring safe operation and extended lifetime of the 0.05F–1.0F supercapacitor bank. This functionality is confirmed in TI's SNVS647C datasheet Section "BALANCING CIRCUIT" and is unique to the LM8850URE/NOPB within its product family.
Does the LM8850URE/NOPB support true shutdown isolation?
Yes, the LM8850URE/NOPB provides true shutdown isolation with only 0.4µA typical shutdown supply current and complete output disconnect. When the EN pin is pulled below 0.4V, both NFET and PFET switches turn off, eliminating reverse current flow from VOUT to VIN. This behavior is specified in the Electrical Characteristics table under ISHDN and verified in the "OPERATION DESCRIPTION" section of the SNVS647C datasheet.
Can the LM8850URE/NOPB operate without a supercapacitor?
No - the LM8850URE/NOPB's AUTO mode (PFM/PWM) requires a supercapacitor to function correctly. As stated in the datasheet: "Auto mode can only be used with a supercapacitor. If no supercapacitor is being used in the circuit, Auto-Mode must be disabled via I²C." Without the supercapacitor, forced PWM mode must be selected, and active balancing (BAL pin) becomes irrelevant.
What is the maximum I²C clock frequency supported by the LM8850URE/NOPB?
The LM8850URE/NOPB supports high-speed I²C mode up to 3.4 MHz, in addition to standard 400 kHz operation. This is explicitly documented in the "I2C INTERFACE" section of SNVS647C and confirmed by timing diagrams (Figure 24–28). The device uses standard I²C protocol with slave address 0x60 and requires 2 kΩ pull-up resistors on SDA and SCLK lines.
How does the LM8850URE/NOPB handle input voltage transients during operation?
The LM8850URE/NOPB maintains regulation during input transients via fast line transient response - demonstrated in Figures 16–17 of SNVS647C, showing recovery within ~200 µs for VIN steps (e.g., 2.7V ↔ 3.6V at 600 mA load). Its voltage-mode control loop, combined with 2.5 MHz switching and internal compensation, ensures stable output despite rapid battery voltage changes across the 2.3V–5.5V operating range.
LM8850URE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 9-XFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.6V
- Voltage - Output (Max):
- 5.7V
- Current - Output:
- 1.35A (Switch)
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-DSBGA
LM8850URE/NOPB FAQ
1.How can I place an order for LM8850URE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM8850URE/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 LM8850URE/NOPB reliable?
The price and inventory of LM8850URE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM8850URE/NOPB is usually 5 days.
3.What payment methods are accepted for LM8850URE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM8850URE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM8850URE/NOPB?
LM8850URE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM8850URE/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 LM8850URE/NOPB?
For technical support, including LM8850URE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM8850URE/NOPB requirements.
6.How does Aetrix verify that LM8850URE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM8850URE/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 LM8850URE/NOPB meets industry standards.
7.What is the process for return or replacement of LM8850URE/NOPB?
All LM8850URE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM8850URE/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 LM8850URE/NOPB part is unused and in its original packaging.
Return procedure for LM8850URE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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