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Analog Devices Inc./Maxim Integrated MAX16945TGUT+
- Part No.:
- MAX16945TGUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX16945TGUT+.pdf
- Description:
- IC REG CHARGE PUMP ADJ 30MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:3,865
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Product details
Overview
MAX16945TGUT+ from Maxim Integrated is an AEC-Q100 qualified monolithic inverting charge-pump IC that converts +1.4V to +5.5V input into a regulated -VIN output, delivering up to 30mA continuous current at +105°C with 12Ω typical output resistance and 125kHz fixed-frequency operation. It serves as a compact negative supply generator for GaAsFET bias, small LCD panels, and EMI-sensitive automotive infotainment modules.
For engineers reviewing the MAX16945TGUT+ datasheet, MAX16945TGUT+ pinout, MAX16945TGUT+ application, or MAX16945TGUT+ equivalent, key selection criteria include guaranteed 30mA output at +105°C, slew-rate-limited switching for EMI reduction, 0.1µA shutdown current, 6-pin SOT23 footprint, and automotive-grade thermal and reliability qualification.
Technical Context
The MAX16945TGUT+ implements a two-phase switched-capacitor voltage inverter using four on-chip power MOSFETs and internal oscillator control. Its fixed 125kHz switching frequency enables use of 2.2µF ceramic flying and reservoir capacitors while maintaining low output impedance.
It features active output pull-down during shutdown (3Ω to GND), startup current limiting (170mA typ), and logic-controlled SHDN with sub-100µs wake-up time. Input voltage range (1.4V–5.5V) and output resistance (≤36Ω over temperature) are specified across -40°C to +105°C for automotive deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.4V to +5.5V - supports direct connection to 1.8V, 2.5V, 3.3V, and 5V logic rails without external regulation. |
| Output Current | 30mA guaranteed at +105°C - ensures stable negative bias under full automotive temperature stress. |
| Oscillator Frequency | 125kHz (typ) - balances EMI performance and capacitor size; fixed frequency eliminates external timing components. |
| Output Resistance | 12Ω (typ) at +25°C; ≤36Ω over -40°C to +105°C - defines load regulation and voltage droop under 30mA output. |
| Shutdown Current | 0.03µA max at +105°C - enables ultra-low-power system sleep modes in battery-backed automotive ECUs. |
| Package | 6-pin SOT23 (U6F+6) - surface-mount footprint compatible with standard reflow profiles per JEDEC J-STD-020A. |
| AEC-Q100 Grade | Grade 2 (-40°C to +105°C) - qualified for engine bay and cabin electronics per automotive reliability standard. |
Pinout & Package
MAX16945TGUT+ is housed in a RoHS-compliant, lead(Pb)-free 6-pin SOT23 package (package code U6F+6), with exposed pad not connected internally. Thermal design requires adherence to JEDEC J-STD-020A reflow profile due to specialized packaging construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Inverting charge-pump output | Delivers regulated -VIN voltage; actively pulled to GND via 3Ω switch during shutdown. |
| 2 - IN | Positive input supply | Accepts 1.4V–5.5V; supplies all internal circuitry and flying capacitor charging path. |
| 3 - C1- | Flying capacitor negative terminal | Connects to negative side of external flying capacitor (C1); critical for charge transfer phase reversal. |
| 4 - GND | Analog/digital ground reference | Common return for IN, OUT, SHDN, and internal switches; must be low-impedance plane for EMI control. |
| 5 - SHDN | Logic-controlled shutdown enable | Active-low input; <0.2V = shutdown (2nA IQ), >2.1V = normal operation (125kHz switching). |
| 6 - C1+ | Flying capacitor positive terminal | Connects to positive side of external flying capacitor (C1); alternates between IN and OUT potentials each half-cycle. |
Key Features
| Feature | Design Value |
|---|---|
| Slew-rate limited switching | Reduces high-frequency EMI emissions to meet CISPR 25 Class 5 requirements in automotive head units and ADAS sensors. |
| Startup current limiting | Clamps inrush to 170mA typ, preventing brownout on weak sources like alkaline batteries or long PCB traces. |
| Active output pull-down | 3Ω internal switch pulls OUT to GND in shutdown, eliminating need for external discharge resistor in safety-critical systems. |
| Low-ESR capacitor optimized | Guaranteed 30mA output requires flying/output capacitors with ≤0.3Ω ESR - validated with standard X5R/X7R 0603 ceramics. |
| Thermal robustness | Rated for continuous operation at +105°C ambient with 134°C/W junction-to-ambient thermal resistance - suitable for under-dash mounting. |
Applications
| Automotive Infotainment Displays | GaAsFET RF Bias Supply |
|---|---|
Use Scenario: Powering negative gate bias for GaAsFET LNA stages in automotive radar front-ends. IC Role / Device Role / Timing Role: Generates stable -3.3V or -5V bias from vehicle's 5V domain, with fast transient response to RF burst modes. Use Value: 12Ω output resistance ensures <100mV droop at 30mA RF peak current; AEC-Q100 qualification guarantees operation across engine-off cold crank to hot soak conditions. | Use Scenario: Providing negative supply for OLED display driver ICs in digital instrument clusters. IC Role / Device Role / Timing Role: Inverts 3.3V MCU rail to -3.3V for display source driver VGL, synchronized to display refresh timing. Use Value: 125kHz fixed frequency avoids beat frequencies with display pixel clock; slew-rate limiting suppresses ripple coupling into analog video signals. |
| Industrial Handheld Terminals | EMI-Sensitive Sensor Signal Conditioning |
Use Scenario: Generating negative supply for precision op-amps in portable diagnostic tools with isolated analog inputs. IC Role / Device Role / Timing Role: Delivers clean -2.5V reference from 3.3V battery rail, enabling rail-to-rail input op-amp operation. Use Value: 0.03µA shutdown current extends battery life in sleep mode; 6-pin SOT23 minimizes board area in space-constrained handheld enclosures. | Use Scenario: Biasing piezoelectric transducers in ultrasonic parking assist modules. IC Role / Device Role / Timing Role: Supplies low-noise -5V bias to transducer driver amplifiers, operating alongside CAN FD communication. Use Value: Slew-rate limited switching prevents conducted EMI from corrupting CAN FD bit timing; -40°C to +105°C rating covers full vehicle operating envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting charge-pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27761DSGR | Fixed 1.2MHz switching; 200mA peak output; no AEC-Q100 qualification; 10-pin WSON package. | Higher frequency enables smaller 1µF capacitors but increases EMI risk in automotive cabins. | Select when board space is constrained and EMI filtering can be added externally; not recommended for under-hood use. |
| TPS60403DBVR | 1.2MHz switching; 60mA output; industrial temp range only (-40°C to +85°C); 5-pin SOT23. | Lacks automotive qualification and active output pull-down; higher quiescent current (120µA vs. 0.03µA). | Acceptable for non-safety-critical industrial PDAs where cost is prioritized over thermal margin and shutdown behavior. |
Compared with LM27761DSGR and TPS60403DBVR, MAX16945TGUT+ trades higher-frequency efficiency for lower EMI, adds automotive qualification and active shutdown, and maintains compatibility with legacy 2.2µF capacitor footprints - making it the only option qualified for direct replacement in AEC-Q100-compliant designs requiring guaranteed 30mA at +105°C.
Availability
MAX16945TGUT+ is available at Aetrix Electronics and suitable for automotive infotainment displays, GaAsFET RF bias supplies, and EMI-sensitive sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX16945TGUT+ 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
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX16945 belongs to Maxim's automotive-qualified power management portfolio, engineered specifically for EMI-sensitive negative supply generation in harsh-temperature environments such as infotainment, ADAS, and body electronics.
FAQ
What is the maximum continuous output current of the MAX16945TGUT+ at +105°C?
The MAX16945TGUT+ guarantees 30mA continuous output current at +105°C, verified across production lots per AEC-Q100 stress testing. This rating assumes use of 2.2µF ceramic capacitors with ≤0.3Ω ESR and proper PCB layout with ground plane. At +25°C, short-circuit current reaches 170mA, but sustained operation above 30mA at high temperature exceeds thermal limits.
Does the MAX16945TGUT+ require external timing components?
No, the MAX16945TGUT+ integrates a fixed-frequency 125kHz oscillator and all four power MOSFET switches on-die. No external resistors or capacitors are needed for frequency setting. Only two external 2.2µF ceramic capacitors (C1 flying, C2 reservoir) and optional input bypass capacitor C3 are required for basic operation.
How does the MAX16945TGUT+ behave during shutdown?
When SHDN is driven low, the MAX16945TGUT+ halts switching, reduces supply current to ≤0.03µA at +105°C, and actively pulls the OUT pin to GND through a 3Ω internal switch. This eliminates floating outputs and removes need for external discharge paths - critical for functional safety in automotive systems where uncontrolled node voltages could disrupt downstream circuitry.
Is the MAX16945TGUT+ pin-compatible with other Maxim charge pumps?
No, the MAX16945TGUT+ uses a unique 6-pin SOT23 pinout (OUT-IN-C1--GND-SHDN-C1+) optimized for inverting topology. It is not pin-compatible with MAX680, MAX660, or MAX1722 series, which use different pin assignments and lack AEC-Q100 qualification. Direct replacement requires PCB layout revision.
What capacitor types and values are recommended for the MAX16945TGUT+?
Maxim specifies 2.2µF X5R or X7R ceramic capacitors (0603 or 0805) for both C1 (flying) and C2 (reservoir), with ESR ≤0.3Ω. Larger values (e.g., 4.7µF) reduce output impedance further but yield diminishing returns beyond 2.2µF. An optional 2.2µF input bypass capacitor (C3) is recommended to suppress switching noise on the IN rail.
MAX16945TGUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -1.4V
- Voltage - Output (Max):
- -5.5V
- Current - Output:
- 30mA
- Frequency - Switching:
- 125kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX16945TGUT+ FAQ
1.How can I place an order for MAX16945TGUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16945TGUT+ 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 MAX16945TGUT+ reliable?
The price and inventory of MAX16945TGUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16945TGUT+ is usually 5 days.
3.What payment methods are accepted for MAX16945TGUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16945TGUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16945TGUT+?
MAX16945TGUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16945TGUT+ 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 MAX16945TGUT+?
For technical support, including MAX16945TGUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16945TGUT+ requirements.
6.How does Aetrix verify that MAX16945TGUT+ is sourced from the original manufacturer or authorized distributors?
All MAX16945TGUT+ 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 MAX16945TGUT+ meets industry standards.
7.What is the process for return or replacement of MAX16945TGUT+?
All MAX16945TGUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16945TGUT+, 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 MAX16945TGUT+ part is unused and in its original packaging.
Return procedure for MAX16945TGUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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