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onsemi LV57331TT-TLM-H
- Part No.:
- LV57331TT-TLM-H
- Manufacturer:
- onsemi
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LV57331TT-TLM-H.pdf
- Description:
- IC REG BOOST ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
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Product details
Overview
LV57331TT-TLM-H from SANYO Semiconductor is a monolithic 1-channel step-up switching regulator with adjustable output voltage, integrated 0.16Ω N-channel power FET, 1.8A switch current limit, and selectable switching frequency (560 kHz or 1.2 MHz). It operates from 2.6V to 5.5V input and delivers up to 15V output, suited for powering white LED backlighting in portable displays.
For engineers reviewing the LV57331TT-TLM-H datasheet, pinout, applications, or equivalent options, key selection criteria include UVP threshold (1.7–1.9 V), soft-start charge current (6–24 µA), shutdown quiescent current (0.01–0.1 µA), and thermal shutdown at 125°C junction temperature.
Technical Context
The LV57331TT-TLM-H implements fixed-frequency PWM control with slope compensation and an 85% maximum duty cycle limit to ensure stability under wide input/output conditions. Its error amplifier features 300 µS transconductance and 300 V/V gain, referenced to a 1.245 V (typ) internal bandgap.
Frequency selection is achieved via the FSLCT pin: grounded or open selects 560 kHz, while pulled to VIN selects 1.2 MHz. The device integrates undervoltage protection (UVP), overheat protection, and a soft-start circuit with 15 µA constant-current source into the SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 2.6 V to 5.5 V - supports single-cell Li-ion or triple-AA battery inputs |
| Max output voltage | 15 V - sufficient for driving 3–4 series white LEDs (3.3 V each) |
| Switch current limit | 1.0 A (min) to 3.0 A (max), 1.8 A (typ) - sets peak inductor current and short-circuit robustness |
| Feedback voltage | 1.215 V to 1.275 V (1.245 V typ) - determines output voltage accuracy via external resistor divider |
| Switching frequency | 560 kHz (FSLCT = GND/open) or 1.2 MHz (FSLCT = VIN) - enables trade-off between efficiency and EMI/size |
| UVP threshold | 1.7 V to 1.9 V - disables regulator before input collapses, preventing erratic restart |
| Thermal shutdown | 125 °C junction temperature - protects die during overload or poor heatsinking |
Pinout & Package
LV57331TT-TLM-H is housed in an MSOP-8 (150-mil) package, 3.0 mm × 3.0 mm × 1.1 mm max height, with exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Error amplifier output | Compensation node for loop stability; connect RC network between VC and FB |
| 2 - FB | Inverting input of error amplifier | Senses output voltage via resistive divider; regulates VOUT to 1.245 V × (1 + R1/R2) |
| 3 - SHDNB | Active-low shutdown control | Pull low ≤0.6 V to disable regulator; high ≥0.9 V enables operation |
| 4 - GND | Power and signal ground | Reference for all internal circuits; must be low-impedance connection to PCB ground plane |
| 5 - SS | Soft-start control | Internal 15 µA current source charges external capacitor to ramp output voltage linearly |
| 6 - FSLCT | Frequency select | GND/open = 560 kHz; tied to VIN = 1.2 MHz - adjusts switching loss vs. inductor size |
| 7 - VIN | Power input | Supplies internal bias and gate drive; bypass with ≥10 µF ceramic capacitor near pin |
| 8 - SW | N-channel FET drain | Switching node connecting to external inductor and catch diode; handles up to 18 V transient |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.16 Ω N-ch FET | Reduces external component count and conduction loss at 1.8 A peak current |
| Selectably programmable frequency | Enables optimization for EMI compliance (560 kHz) or compact layout (1.2 MHz) |
| UVP with hysteresis | Prevents brown-out oscillation by disabling below 1.7 V and re-enabling above ~1.94 V |
| Soft-start with external capacitor | Eliminates inrush current and output overshoot via user-defined ramp time |
| Thermal shutdown with auto-recovery | Halts switching at 125 °C junction temp and resumes after cooldown, avoiding latch-up |
Applications
| Portable LCD Backlighting | USB-Powered LED Lighting |
|---|---|
Use Scenario: Driving 3–4 white LEDs in handheld medical monitors or industrial PDAs with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Step-up DC-DC controller regulating constant current through LED string via feedback from current-sense resistor. Use Value: Delivers stable 15 V output from 2.6–5.5 V input with <0.2 %/V line regulation, minimizing brightness variation across battery discharge. | Use Scenario: Compact LED lamp powered directly from USB 5 V port requiring >5 V for efficient LED drive. IC Role / Device Role / Timing Role: Boost converter generating regulated 12 V output to drive multiple parallel LED strings with minimal external components. Use Value: Achieves >85 % efficiency at 300 mA load using 1.2 MHz switching, enabling sub-1 cm² solution size with small 1.0 µH inductor. |
| Low-Power Sensor Node Supply | Industrial HMI Display Power |
Use Scenario: Providing 9 V rail for analog sensor front-end and ADC in battery-operated wireless sensor nodes. IC Role / Device Role / Timing Role: Efficient voltage booster enabling higher-resolution analog sensing without increasing battery count. Use Value: Ultra-low 0.01 µA shutdown current extends shelf life; UVP prevents deep discharge damage to primary cell. | Use Scenario: Generating 12 V for TFT-LCD bias and touch controller in factory-floor HMIs operating from 5 V system rail. IC Role / Device Role / Timing Role: Primary boost stage delivering clean, regulated output with built-in thermal protection for unventilated enclosures. Use Value: 125 °C thermal shutdown and 0.7 W allowable dissipation on standard 2-layer board ensure reliability in 85 °C ambient environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVR | Fixed 600 kHz frequency; no frequency select pin; 0.17 Ω FET RDS(on); 0.5 µA shutdown current | Lacks UVP and thermal shutdown; requires external soft-start capacitor | Preferred where ultra-low shutdown IQ is critical and thermal margin is ample |
| MAX1706EUT+T | Fixed 1.2 MHz frequency; 1.5 A switch limit; 1.25 V feedback reference; no UVP | No undervoltage lockout; lower max output voltage (13.2 V); smaller MSOP-6 package | Selected when board space is constrained and input never drops below 2.7 V |
Compared with TPS61040DRVR and MAX1706EUT+T, the LV57331TT-TLM-H uniquely combines selectable frequency, integrated UVP, and thermal shutdown in an MSOP-8 package-making it suitable for battery-powered systems requiring robust fault protection and flexible EMI management.
Availability
LV57331TT-TLM-H is available at Aetrix Electronics and suitable for portable display backlighting, USB-powered LED lighting, and low-power sensor node supply requiring stable component supply and long-term manufacturability.
Supply support for LV57331TT-TLM-H 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
SANYO Semiconductor Co., Ltd. was a Japanese semiconductor manufacturer specializing in analog and power ICs, later acquired by ON Semiconductor in 2011.
The LV57331TT-TLM-H belongs to SANYO's Monolithic Linear IC family designed for compact, high-efficiency DC-DC conversion in space-constrained portable electronics.
FAQ
What is the recommended input capacitor for LV57331TT-TLM-H?
A minimum 10 µF X5R/X7R ceramic capacitor placed within 2 mm of the VIN and GND pins is recommended for LV57331TT-TLM-H to suppress high-frequency switching noise and maintain stable input voltage during peak current transitions. Larger capacitance (e.g., 22 µF) improves hold-up during load transients but must remain low-ESR (<10 mΩ) to avoid instability.
Does LV57331TT-TLM-H support adjustable output voltage?
Yes, LV57331TT-TLM-H supports fully adjustable output voltage via an external resistor divider connected to the FB pin. With a typical feedback reference of 1.245 V, output voltage is calculated as VOUT = 1.245 V × (1 + R1/R2), enabling precise setting from just above 1.245 V up to the 15 V maximum rating.
How does the FSLCT pin affect efficiency in LV57331TT-TLM-H?
The FSLCT pin on LV57331TT-TLM-H selects between 560 kHz and 1.2 MHz switching frequencies. At light loads, 560 kHz yields higher efficiency due to reduced gate charge loss; at heavy loads, 1.2 MHz allows smaller magnetics and lower conduction loss, though switching loss increases. Optimal choice depends on load profile and thermal constraints.
What is the function of the VC pin on LV57331TT-TLM-H?
VC is the error amplifier output pin of LV57331TT-TLM-H and serves as the compensation node for the control loop. An external RC network (typically 10 kΩ + 1 nF) is connected between VC and FB to stabilize phase margin and prevent oscillation, especially when driving capacitive loads or using large output capacitors.
Can LV57331TT-TLM-H operate with a 2.5 V input?
No, LV57331TT-TLM-H has a minimum specified input voltage of 2.6 V per its Recommended Operating Conditions. Operation at 2.5 V falls outside guaranteed specifications and may result in failure to start, unstable regulation, or premature UVP activation - particularly at elevated temperatures or under load.
LV57331TT-TLM-H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.6V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- 560kHz ~ 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LV57331TT-TLM-H FAQ
1.How can I place an order for LV57331TT-TLM-H through Aetrix?
Please submit a Request for Quotation (RFQ) for LV57331TT-TLM-H 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 LV57331TT-TLM-H reliable?
The price and inventory of LV57331TT-TLM-H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LV57331TT-TLM-H is usually 5 days.
3.What payment methods are accepted for LV57331TT-TLM-H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LV57331TT-TLM-H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LV57331TT-TLM-H?
LV57331TT-TLM-H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LV57331TT-TLM-H 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 LV57331TT-TLM-H?
For technical support, including LV57331TT-TLM-H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LV57331TT-TLM-H requirements.
6.How does Aetrix verify that LV57331TT-TLM-H is sourced from the original manufacturer or authorized distributors?
All LV57331TT-TLM-H 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 LV57331TT-TLM-H meets industry standards.
7.What is the process for return or replacement of LV57331TT-TLM-H?
All LV57331TT-TLM-H units undergo pre-shipment inspection (PSI). If there is an issue with LV57331TT-TLM-H, 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 LV57331TT-TLM-H part is unused and in its original packaging.
Return procedure for LV57331TT-TLM-H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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