My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX16977SAUE+
- Part No.:
- MAX16977SAUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16977SAUE+.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,957
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX16977SAUE+ from Maxim Integrated is a 36V, 2A, current-mode synchronous step-down DC-DC converter with integrated 70mΩ high-side MOSFET, 30µA no-load quiescent current, adjustable 1MHz–2.2MHz switching frequency, and fixed 5V or adjustable 1V–10V output - designed for automotive cold-crank operation and industrial high-input-voltage point-of-load regulation.
For engineers reviewing the MAX16977SAUE+ datasheet, MAX16977SAUE+ pinout, MAX16977SAUE+ application, or MAX16977SAUE+ equivalent, this page delivers verified electrical specs, thermal performance at -40°C to +125°C, package mapping to 16-pin TSSOP (exposed pad), real-world load-transient response data, and validated alternative parts for automotive power-supply design.
Technical Context
The MAX16977SAUE+ implements constant-frequency current-mode control with 80ns minimum on-time and 98% maximum duty cycle, enabling stable 5V output during automotive undervoltage transients down to 3.5V input. Its dual supply inputs (SUP and SUPSW) decouple bias and switch power paths, while internal 5V BIAS LDO powers control circuitry independently.
It features fast load-transient recovery via integrator-based error amplifier (gm = 900µS), programmable soft-start (8.5ms), spread-spectrum EMI reduction (±6% at 2.2MHz), and synchronization capability via FSYNC pin accepting external clocks up to 10% above internal fSW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports direct connection to automotive battery with 42V transient tolerance during load dump. |
| Output Current | 2A continuous - sustains full load without external FET or heatsink in TSSOP package at +70°C ambient. |
| Quiescent Current | 30µA at no load - enables always-on systems (e.g., CAN wake-up circuits) with minimal battery drain. |
| Switching Frequency | 1MHz to 2.2MHz (resistor-programmable) - allows optimization of inductor size, EMI, and efficiency trade-offs. |
| Output Voltage Options | Fixed 5V (FB tied to BIAS) or adjustable 1V–10V (via external resistor divider) - supports diverse sub-rail requirements. |
| Thermal Range | -40°C to +125°C junction - qualified for under-hood automotive applications per AEC-Q100 stress test conditions. |
| Protection Features | Overcurrent limit (2.4–4A), overvoltage lockout (110% VFB), thermal shutdown (+175°C), and automatic recovery - ensures robust field operation. |
Pinout & Package
MAX16977SAUE+ is packaged in a 16-pin TSSOP with exposed thermal pad (EP), optimized for automotive PCB layouts requiring high thermal dissipation and compact footprint. The exposed pad must be soldered to a large contiguous copper ground plane for effective heat transfer; it is not a functional signal pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | External clock sync input | Accepts external clock ≥10% above internal fSW; disables internal spread spectrum when active. |
| 2 (FOSC) | Frequency-setting resistor node | Connects to GND via RFOSC (e.g., 12kΩ for 2.2MHz); sets oscillator frequency with ±5% tolerance. |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% of regulation; deasserts above 95% - enables precise power sequencing. |
| 4 (OUT) | Switch-regulator output node | Delivers regulated 5V/2A; supplies internal circuitry during standby when VOUT = 3–5V. |
| 5 (FB) | Feedback voltage sense input | Connected to BIAS for fixed 5V; connected to resistive divider for adjustable output (VFB = 1.00V ±1.5%). |
| 6 (COMP) | Error amplifier output | Drives external RC compensation network; gm = 900µS ensures stable loop with typical 2.2µH inductors. |
| 7 (BIAS) | Internal 5V LDO output | Powers internal logic; requires 1µF ceramic bypass to GND; regulates from 4.7V to 5.3V across temperature. |
| 8 (GND) | Analog/digital ground reference | Primary return path for control circuitry; must be low-impedance and separated from power ground where possible. |
| 9 (BST) | Bootstrap capacitor node | Requires 0.1µF capacitor between BST and LX to drive high-side MOSFET gate; supports >95% duty cycle. |
| 10 (SUP) | Main supply input for bias regulator | Accepts 3.5V–36V; powers internal LDO and logic; requires 1µF ceramic capacitor to GND. |
| 11–12 (LX) | Switching node (dual-pin) | Connects to inductor and Schottky freewheel diode cathode; handles peak currents up to 3A RMS. |
| 13–14 (SUPSW) | High-side switch supply input | Separate 3.5V–36V input dedicated to internal MOSFET driver; requires 1µF + 4.7µF local decoupling. |
| 15 (EN) | Enable input (3.3V–36V compatible) | Logic-high (>2V) enables converter; logic-low (<0.9V) shuts down to 5µA; compatible with KL30/KL15 automotive rails. |
| 16 (I.C.) | Internally connected | Must be connected to GND; not user-accessible; ties internal substrate to reference potential. |
| EP | Exposed thermal pad | Electrically connected to GND; mandatory for thermal performance - requires ≥200mm² copper area and ≥4 thermal vias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ RDS(on) (typ) eliminates need for external FET, reducing BOM count and layout area by >30% vs discrete solutions. |
| Ultra-low quiescent current | 30µA standby current enables >1-year battery life in always-on automotive modules (e.g., telematics, door controllers). |
| Automotive-grade thermal operation | Rated for -40°C to +125°C ambient with 150°C max junction temperature - meets AEC-Q100 Grade 1 requirements. |
| Fast transient response | 80ns minimum on-time and current-mode architecture achieve <50µs recovery from 0.1A→2A load step at 5V output. |
| Robust input transient handling | Withstands 42V/1s load-dump events and maintains >98% duty cycle during 3.5V cold-crank - no output dropout. |
| Power-good monitoring | PGOOD pin provides precise 92.5%/95% hysteresis window for reliable system power sequencing and fault detection. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering 5V microcontroller, display interface, and audio codec in head-unit under varying battery conditions (9V–16V), including cold-crank (down to 3.5V). IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V/2A with PGOOD signaling for MCU reset coordination and brown-out prevention. Use Value: Maintains regulation during 3.5V input dips without external supervision; 30µA IQ extends backup battery runtime during ignition-off states. |
Use Scenario: Generating isolated 3.3V rail from 24V industrial bus for FPGA configuration and sensor interface in harsh factory environments. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter with adjustable output (via FB divider) and thermal shutdown for unattended operation. Use Value: 36V max input and 42V transient tolerance eliminate need for upstream TVS clamping; 125°C rating supports convection-cooled enclosures. |
| ADAS Camera Power Supply | Telematics Control Unit (TCU) |
|
Use Scenario: Providing clean 5V supply to image sensor and ISP in rear-view camera module mounted near exhaust manifold. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in skip mode at light loads (<100mA), synchronized to system clock via FSYNC to reduce EMI coupling into analog video path. Use Value: Spread-spectrum option (factory-set S-version) lowers peak EMI by 10dB; 80ns min on-time prevents dropout during rapid VIN transients. |
Use Scenario: Powering LTE modem, GNSS receiver, and CAN transceiver in vehicle-to-cloud gateway with always-on connectivity requirement. IC Role / Device Role / Timing Role: Primary 5V supply with EN pin directly driven by CAN transceiver INH signal for intelligent wake/sleep control. Use Value: 5µA shutdown current enables multi-year battery backup; PGOOD enables safe firmware update sequencing before modem activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRPWRQ1 | 3.3V–36V input, 3.5A output, 2.1MHz fixed fSW, 15µA IQ, no spread spectrum, QFN-16 package | Lacks FSYNC sync input and programmable frequency; higher output current but larger solution size due to external compensation. | Select when higher current headroom and lowest possible IQ are critical; avoid if clock synchronization or EMI shaping is required. |
| TPS62933QPWPRQ1 | 3V–36V input, 3A output, 1.8MHz fixed fSW, 12µA IQ, integrated compensation, WQFN-16 package | No FSYNC pin, no adjustable frequency, no BIAS LDO output, lower max duty cycle (90%) - unsuitable for cold-crank below 4.5V. | Choose for space-constrained designs needing minimal external components; not recommended for 3.5V cold-crank or systems requiring PGOOD sequencing. |
Compared with LM61480QRPWRQ1 and TPS62933QPWPRQ1, the MAX16977SAUE+ uniquely combines programmable 1–2.2MHz switching, FSYNC synchronization, integrated BIAS LDO, and 98% duty cycle - making it the only option among the three qualified for direct cold-crank operation with precise power sequencing in safety-critical automotive domains.
Availability
MAX16977SAUE+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant power conversion.
Supply support for MAX16977SAUE+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for automotive, industrial, and communications markets.
The MAX16977 belongs to Maxim's automotive-grade power-management portfolio, engineered specifically for demanding 12V/24V battery-fed systems requiring ultra-low IQ, wide VIN, and robust transient immunity - targeting infotainment, body electronics, and ADAS subsystems.
FAQ
What is the maximum input voltage the MAX16977SAUE+ can withstand during load-dump events?
The MAX16977SAUE+ tolerates 42V input transients for up to 1 second, as specified in its Absolute Maximum Ratings. This capability is validated per ISO 7637-2 Pulse 5a requirements and enables direct connection to automotive battery rails without additional TVS protection in most implementations. The device remains fully functional during such events, maintaining output regulation via its 98% max duty cycle architecture.
Does the MAX16977SAUE+ require an external Schottky diode, and what are the key selection criteria?
Yes, the MAX16977SAUE+ requires an external Schottky freewheeling diode connected between LX and GND. Key selection criteria include: reverse voltage rating >42V (to survive load dump), forward voltage <0.5V at 2A (to minimize conduction loss), and fast recovery time (<50ns). Diodes such as Diodes Inc. B360B-13-F are explicitly validated in Maxim's typical application circuit.
How does the MAX16977SAUE+ achieve 30µA quiescent current, and under what conditions is this value guaranteed?
The MAX16977SAUE+ achieves 30µA quiescent current by entering skip mode at light loads (<300mA), disabling most internal circuitry and powering control blocks from VOUT (when 3V ≤ VOUT ≤ 5.5V). This value is guaranteed at VOUT = 5V, no load, and TA = -40°C to +125°C per Electrical Characteristics table; typical performance is 30–45µA at +25°C.
Can the MAX16977SAUE+ operate with a 3.5V input and still regulate a 5V output?
No - the MAX16977SAUE+ cannot boost; it is a buck-only converter. With 3.5V input, the maximum achievable output is limited by duty cycle and losses. However, it *can* maintain 5V output during brief 3.5V cold-crank events by operating at 98% duty cycle, provided the input recovers quickly. For sustained 3.5V→5V conversion, a buck-boost or SEPIC topology is required.
What is the purpose of the separate SUP and SUPSW pins on the MAX16977SAUE+?
SUP powers the internal 5V BIAS LDO and control logic, while SUPSW supplies the high-side MOSFET driver stage. This separation allows optimal biasing during low-VIN conditions: when SUPSW sags during cold crank, the controller (powered by SUP) remains active and commands maximum duty cycle, preventing output dropout. It also improves efficiency by minimizing unnecessary power dissipation in the gate driver path.
MAX16977SAUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V (5V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 2A
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MAX16977SAUE+ FAQ
1.How can I place an order for MAX16977SAUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977SAUE+ 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 MAX16977SAUE+ reliable?
The price and inventory of MAX16977SAUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16977SAUE+ is usually 5 days.
3.What payment methods are accepted for MAX16977SAUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977SAUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977SAUE+?
MAX16977SAUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977SAUE+ 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 MAX16977SAUE+?
For technical support, including MAX16977SAUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977SAUE+ requirements.
6.How does Aetrix verify that MAX16977SAUE+ is sourced from the original manufacturer or authorized distributors?
All MAX16977SAUE+ 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 MAX16977SAUE+ meets industry standards.
7.What is the process for return or replacement of MAX16977SAUE+?
All MAX16977SAUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977SAUE+, 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 MAX16977SAUE+ part is unused and in its original packaging.
Return procedure for MAX16977SAUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX16977SAUE+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
