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Texas Instruments LM2775DSGT
- Part No.:
- LM2775DSGT
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LM2775DSGT.pdf
- Description:
- IC REG CHARG PUMP 5V 200MA 8WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2775DSGT from Texas Instruments is a regulated switched-capacitor voltage doubler IC that generates a stable 5-V output from 2.7-V to 5.5-V inputs, delivering up to 200 mA at ±2% regulation, operating at 2 MHz, and featuring PFM mode for ultra-low quiescent current in portable USB OTG power supplies.
For engineers reviewing the LM2775DSGT datasheet, LM2775DSGT pinout, LM2775DSGT application, or LM2775DSGT equivalent, this page delivers verified functional modes (PFM/PWM), thermal shutdown behavior, output disconnect control, pre-regulation architecture, and WSON-8 package layout guidance - all critical for low-noise, inductorless 5-V rail design in space-constrained systems.
Technical Context
The LM2775DSGT implements pre-regulation before charge-pumping: internal current-controlled switches modulate input current to set V′, which is then doubled and linearly regulated to maintain 5 V. This eliminates typical input current ripple of basic charge pumps.
It operates in two distinct functional modes: constant-frequency PWM (PFM = low) for predictable 2-MHz switching and low output ripple, or burst-mode PFM (PFM = high) where switching occurs only as needed to sustain VOUT ≥ 4.95 V, reducing IQ to 75 µA at no load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00 V ±2% (4.8–5.2 V) across 0–200 mA load and −40°C to +85°C ambient - enables direct replacement of LDOs in 5-V USB/HDMI rails. |
| Input Range | 2.7 V to 5.5 V - supports single-cell Li-ion (3.0–4.2 V), LiFePO₄, or dual-AA/AAA battery inputs without external regulators. |
| Max Output Current | 200 mA at VIN ≥ 3.1 V - sufficient for USB OTG host mode, HDMI sink power, or small logic rails with <3.5 Ω effective output resistance. |
| Switching Frequency | 2.0 MHz (1.7–2.3 MHz) - allows use of tiny 0402-case ceramic capacitors (CIN/COUT = 2.2 µF, C1 = 1 µF) and minimizes EMI in RF-sensitive layouts. |
| Quiescent Current | 75 µA (PFM enabled, IOUT = 0) vs. 5 mA (PFM disabled) - extends battery life in always-on portable devices by >60× under light load. |
| Shutdown Current | 0.7–3 µA - ensures negligible drain during system sleep; OUTDIS pin selects between active discharge (450 µA pull-down) or high-Z retention. |
| Thermal Protection | Junction shutdown at 150°C (releases at 130°C) - prevents damage during sustained 200-mA operation at high VIN; WSON-8 package achieves RθJA = 71.6°C/W. |
Pinout & Package
LM2775DSGT is housed in an 8-pin WSON package (2.0 mm × 2.0 mm, 0.5-mm pitch) with exposed thermal pad soldered to PCB ground for optimal heat dissipation in high-power-density designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PFM | Digital control input | Enables/disables pulse-frequency modulation: high = PFM active (low-IQ), low = fixed 2-MHz PWM (low-ripple). |
| 2 - C1− | Flying capacitor terminal | Connects to negative side of 1-µF flying capacitor; forms charge-transfer path during φ1 (charge) and φ2 (pump) phases. |
| 3 - C1+ | Flying capacitor terminal | Connects to positive side of 1-µF flying capacitor; switches between VIN and VOUT nodes to double voltage. |
| 4 - OUTDIS | Digital control input | Selects shutdown behavior: high = active output discharge to GND (~450 µA), low = high-impedance hold (1.6 µA leakage). |
| 5 - EN | Enable input | Active-high enable: drives internal circuitry on/off; <0.4 V = shutdown (<1 µA), >1.2 V = operational. |
| 6 - VOUT | Regulated output | Delivers 5-V supply to load; requires 2.2-µF ceramic output capacitor; exhibits <10 mVpp ripple at 200 mA with proper layout. |
| 7 - VIN | Power input | Accepts 2.7–5.5 V; includes undervoltage lockout (UVLO trips at 2.4 V falling, releases at 2.6 V rising). |
| 8 - GND | Ground reference | Primary signal and power return; thermal pad must be connected to solid PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless 5-V boost | Eliminates magnetic components: uses only three 0402 ceramic capacitors (CIN, COUT, C1) - reduces BOM cost, board area, and EMI risk. |
| Pre-regulation architecture | Controls input current before voltage doubling - suppresses input ripple by >90% vs. standard charge pumps, critical for noise-sensitive analog/RF sections. |
| Configurable shutdown discharge | OUTDIS pin selects between safe rail collapse (for shared-bus systems) or voltage hold (for USB OTG back-powering compatibility). |
| Integrated protection | Includes 600-mA input current limit, thermal shutdown (150°C), and UVLO - enables robust operation without external fault management circuitry. |
| Wide temperature support | Specified from −40°C to +85°C ambient, with tested performance across −40°C/+25°C/+85°C - suitable for industrial handhelds and automotive infotainment accessories. |
Applications
| USB OTG Power Supply | HDMI Sink Power |
|---|---|
Use Scenario: Portable smartphone or tablet acting as USB host to peripherals (keyboard, flash drive) requiring 5-V bus power. IC Role / Device Role / Timing Role: Regulated 5-V charge-pump converter providing up to 200 mA from 3.3-V system rail, with OUTDIS = low to retain VOUT during host suspend. Use Value: Enables true OTG functionality without bulky inductors or external LDOs; PFM mode extends battery runtime during idle enumeration. |
Use Scenario: HDMI receiver IC (e.g., TFP410) needing clean 5-V supply for hot-plug detection and DDC communication. IC Role / Device Role / Timing Role: Low-noise, fast-starting 5-V source with <10-ms startup time into 10-µF load; pre-regulation prevents HDMI PHY interference from input ripple. Use Value: Meets HDMI specification's 5-V ±5% tolerance and <100-mVpp ripple requirement using only ceramic caps - simplifies compliance testing. |
| Portable Medical Sensor Hub | Industrial Handheld Terminal |
Use Scenario: Battery-powered wearable sensor node aggregating ECG, SpO₂, and temperature data, transmitting via BLE. IC Role / Device Role / Timing Role: Primary 5-V rail generator for USB-C charging port and analog front-end biasing; thermal shutdown prevents overheating during extended diagnostics. Use Value: WSON-8 footprint fits tight 12-mm × 12-mm PCB area; 75-µA PFM IQ enables >1-year shelf life on coin cell backup. |
Use Scenario: Ruggedized barcode scanner with 3.7-V Li-ion battery, requiring stable 5-V for imager, decoder ASIC, and display backlight driver. IC Role / Device Role / Timing Role: Input-voltage-flexible boost converter supporting full battery range (4.2 V → 3.0 V); UVLO prevents brownout resets during deep discharge. Use Value: Maintains 5-V regulation down to 2.7-V input - extends usable battery capacity by ~15% vs. fixed-input alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS60403DBVR | Fixed 5-V output, 60-mA max, 1-MHz switching, no PFM mode, SOT-23-5 package. | Limited to ultra-low-power sensors or logic biasing; lacks thermal/overcurrent protection and OUTDIS control. | Choose only if output current ≤60 mA and board space is constrained to SOT-23; not suitable for USB OTG or HDMI. |
| MAX881RASA+T | 5-V output, 100-mA max, 1.2-MHz, integrated soft-start, no PFM, 8-pin SOIC package. | Higher pin count and larger footprint; no output discharge option; higher IQ (120 µA) limits battery life. | Consider only for legacy through-hole designs or where SOIC rework is preferred; inferior efficiency above 100 mA. |
Compared with TPS60403DBVR and MAX881RASA+T, LM2775DSGT delivers 2× higher output current in half the footprint, adds PFM for battery optimization, and provides configurable shutdown behavior - making it the only choice for modern portable 5-V rail generation where size, efficiency, and feature integration are co-constrained.
Availability
LM2775DSGT is available at Aetrix Electronics and suitable for USB OTG power supplies, HDMI sink circuits, and portable medical sensor hubs requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LM2775DSGT 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 energy-efficient IC design.
The LM2775DSGT belongs to TI's switched-capacitor DC/DC converter product line, engineered specifically for compact, inductorless 5-V power rails in battery-operated consumer and industrial devices where EMI, size, and quiescent power are critical constraints.
FAQ
What is the minimum input voltage required for LM2775DSGT to regulate 5 V?
The LM2775DSGT maintains 5-V regulation down to 2.7 V input across its full operating temperature range. Below 2.7 V, undervoltage lockout activates at 2.4 V (falling), disabling the device. At 3.1 V input and above, it delivers full 200-mA output; at 2.7 V, maximum output drops to 125 mA per TI's datasheet specifications. The LM2775DSGT's pre-regulation architecture enables this wide input range without external components.
Does LM2775DSGT require an inductor in its application circuit?
No, the LM2775DSGT is an inductorless switched-capacitor voltage doubler. It uses only three external ceramic capacitors: one flying capacitor (C1 = 1 µF), one input capacitor (CIN = 2.2 µF), and one output capacitor (COUT = 2.2 µF). This eliminates magnetic components, reduces EMI, saves board space, and lowers BOM cost - a key differentiator versus inductive boost converters. The LM2775DSGT achieves this via internal switch-controlled charge transfer between C1 and the output stage.
How does the PFM pin affect LM2775DSGT efficiency at light loads?
When the PFM pin is high, the LM2775DSGT enters pulse-frequency modulation mode, reducing quiescent current to just 75 µA at zero load - improving light-load efficiency by over 60× compared to PWM mode (5 mA IQ). Switching occurs only when VOUT droops below ~4.95 V, allowing long idle periods. This behavior is confirmed in Figure 8 of the LM2775DSGT datasheet and directly extends battery life in intermittently active portable devices.
Can LM2775DSGT safely power a USB OTG host port?
Yes, the LM2775DSGT is explicitly designed for USB OTG applications. It delivers up to 200 mA at 5.0 V ±2%, meets USB 2.0 voltage tolerance, and features OUTDIS control to maintain VOUT in high-Z mode during suspend - preventing back-driving of the host system. Its low output ripple (<10 mVpp) and fast transient response (Figure 15) ensure stable enumeration and data transfer. TI lists "USB OTG" as a primary application in the LM2775DSGT datasheet.
What thermal considerations apply to LM2775DSGT at 200 mA output?
At 200 mA and 5.5-V input, LM2775DSGT dissipates up to 1.35 W. Its WSON-8 package relies on the exposed thermal pad soldered to a ≥100-mm² PCB ground plane to achieve RθJA = 71.6°C/W. Without adequate copper, junction temperature can exceed 150°C, triggering thermal shutdown. TI's layout guidelines (Section 10.2) mandate thermal vias under the pad and minimize trace resistance - essential for sustained 200-mA operation. The LM2775DSGT's thermal shutdown (150°C) and release (130°C) thresholds are fully characterized.
LM2775DSGT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 200mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
LM2775DSGT FAQ
1.How can I place an order for LM2775DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2775DSGT 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 LM2775DSGT reliable?
The price and inventory of LM2775DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2775DSGT is usually 5 days.
3.What payment methods are accepted for LM2775DSGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2775DSGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2775DSGT?
LM2775DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2775DSGT 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 LM2775DSGT?
For technical support, including LM2775DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2775DSGT requirements.
6.How does Aetrix verify that LM2775DSGT is sourced from the original manufacturer or authorized distributors?
All LM2775DSGT 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 LM2775DSGT meets industry standards.
7.What is the process for return or replacement of LM2775DSGT?
All LM2775DSGT units undergo pre-shipment inspection (PSI). If there is an issue with LM2775DSGT, 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 LM2775DSGT part is unused and in its original packaging.
Return procedure for LM2775DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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