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Analog Devices Inc./Maxim Integrated MAX77596ETBB+
- Part No.:
- MAX77596ETBB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX77596ETBB+.pdf
- Description:
- IC REG BUCK 3.3V 300MA 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,479
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Product details
Overview
MAX77596ETBB+ from Maxim Integrated is a 3.3V fixed-output, 24V-input, 300mA synchronous buck converter in a 10-pin TDFN package, delivering ultra-low 1.1µA quiescent current in skip mode and operating down to 3.5V input-ideal for Li-ion–powered portable devices requiring high efficiency at light loads.
For engineers reviewing the MAX77596ETBB+ datasheet, MAX77596ETBB+ pinout, MAX77596ETBB+ application, or MAX77596ETBB+ equivalent, key selection factors include its 1.7MHz switching frequency, 98% max duty cycle for low-dropout operation, integrated BIAS LDO, RESET monitoring output, and thermal/short-circuit protection-critical for USB Type-C and point-of-load designs.
Technical Context
The MAX77596ETBB+ implements current-mode PWM control with integrated slope compensation and load-line voltage positioning, enabling stable regulation without external compensation. Its peak-current sensing uses internal high-side sensing, eliminating sensitive external routing.
It supports dual operating modes: forced-PWM (constant 1.7MHz) for predictable EMI filtering, and skip mode (1.1µA IQ) for battery life extension. The 6.67ms internal soft-start minimizes inrush, while the open-drain RESET output asserts low when VOUT falls below 90% of nominal (3.3V), with 12µs debounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.5V to 24V - supports 2S/3S/4S Li-ion batteries and USB Type-C 5V/12V/20V inputs |
| VOUT | Fixed 3.3V ±3% - factory-trimmed, no external feedback required |
| IOUT Max | 300mA - sufficient for microcontrollers, sensors, and interface ICs in space-constrained systems |
| IQ (Skip Mode) | 1.1µA - enables multi-year battery life in always-on IoT endpoints |
| fSW | 1.7MHz (±6%) - permits use of compact 10µH inductors and low-ESR ceramic capacitors |
| Duty Cycle Max | 98% - sustains regulation down to VIN = 3.38V (3.3V/0.98), critical for deep battery discharge |
| Operating Temp | –40°C to +85°C - qualified for industrial and portable consumer environments |
Pinout & Package
MAX77596ETBB+ is housed in a 2.0mm × 2.5mm × 0.75mm, 10-pin TDFN-EP package with exposed pad (EP) for thermal dissipation. Pin 1 (BST) requires a 0.1µF bootstrap capacitor to LX; Pin 9 (OUT/FB) serves as direct output sense for fixed-voltage operation; Pin 6 (RESET) is open-drain and requires external pullup.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | High-side gate driver supply | Connect 0.1µF ceramic capacitor between BST and LX to sustain high-side MOSFET drive during 98% duty cycle |
| SUP | Main power input | Accepts 3.5V–24V; requires ≥4.7µF ceramic decoupling capacitor placed adjacent to pin |
| LX | Switching node | Connects to inductor; high-impedance when device is disabled; must be routed with minimal loop area |
| PGND | Power ground return | Star-connected to AGND under device; primary return path for high-current switch node |
| AGND | Analog reference ground | Connected to PGND only at output capacitor return; isolates noise-sensitive feedback path |
| RESET | Open-drain fault monitor | Asserts low when VOUT < 2.97V (90% of 3.3V); requires external pullup to VBIAS or system rail |
| MODE | Operating mode select | Ground or floating → skip mode (1.1µA IQ); connect to BIAS → forced-PWM (constant 1.7MHz) |
| BIAS | Internal 5V LDO output | Supplies internal logic; bypass with 1µF ceramic to AGND; do not load externally |
| OUT/FB | Output voltage sense / FB input | For MAX77596ETBB+: direct connection to regulated 3.3V output; bypass with ≥22µF X5R ceramic |
| EN | Enable control | Logic-compatible input (VIH = 2.4V); connects directly to SUP for simple on/off control |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control with integrated slope compensation | Enables stable operation without external compensation components and provides inherent line regulation |
| Load-line voltage positioning | Reduces required output capacitance by allowing controlled droop (e.g., ~3.28V at 300mA vs. 3.30V at no load) |
| Integrated 5V BIAS LDO | Eliminates need for external bias supply; powers internal circuitry with dedicated 1µF bypass |
| 6.67ms internal soft-start | Prevents inrush current into output capacitors; avoids supply rail collapse during startup |
| Thermal shutdown with 15°C hysteresis | Shuts down at 175°C junction temperature and resumes only after cooling to ~160°C, preventing thermal cycling |
Applications
| Portable Medical Sensors | USB-C Power Delivery Receivers |
|---|---|
Use Scenario: Wearable ECG patch powered by 3.7V single-cell Li-ion, requiring continuous 3.3V supply for analog front-end and BLE radio with multi-month battery life. IC Role / Device Role: Primary step-down regulator converting variable battery voltage (4.2V–3.0V) to stable 3.3V while maintaining sub-µA quiescent draw during sleep cycles. Use Value: 1.1µA IQ in skip mode extends runtime beyond 18 months; 98% duty cycle sustains regulation until battery reaches 3.38V, maximizing usable capacity. | Use Scenario: USB-C accessory (e.g., docking station hub) accepting 5V/9V/15V/20V PD input and generating local 3.3V rail for USB controller and status LEDs. IC Role / Device Role: Input-flexible PoL converter handling wide VIN range without external voltage scaling or multiple regulators. Use Value: 3.5V–24V input range accepts all USB PD profiles; 1.7MHz switching allows tiny 10µH inductor and 22µF output cap, reducing board area by >40% vs. lower-frequency alternatives. |
| Industrial Handheld Scanners | Smart Home Edge Nodes |
Use Scenario: Rugged barcode scanner using 2S Li-ion (7.4V–6.0V) with cold-temperature operation down to –40°C and frequent wake/sleep cycles. IC Role / Device Role: Main system supply delivering 300mA peak to image sensor and decode processor, with robust fault protection. Use Value: –40°C to +85°C rating ensures reliability in warehouse environments; short-circuit protection limits fault energy during connector hot-plug events. | Use Scenario: Battery-backed Zigbee/Z-Wave thermostat with always-on MCU, RF transceiver, and display, requiring ultra-low standby power and clean 3.3V rail. IC Role / Device Role: Primary power source for mixed-signal SoC, providing regulated 3.3V with RESET supervision for brownout detection. Use Value: RESET output tied to MCU's reset pin enables automatic recovery from undervoltage; 1.1µA IQ preserves coin-cell backup for >5 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | 1.8V–6.5V input, 3.3V fixed, 1.0µA IQ, 2.5MHz fSW, 1.5mm × 2.0mm DSBGA | Narrower input range; optimized for single-cell Li-ion only; smaller footprint but lower max IOUT (200mA) | Select when board space is critical and input never exceeds 6.5V; avoid for USB-C or multi-cell battery systems. |
| RT7297CGJ6F | 4.5V–18V input, 3.3V fixed, 2.5µA IQ, 1.5MHz fSW, 2mm × 2mm WDFN | Higher IQ reduces battery life; lacks RESET output and BIAS LDO; no skip/FPWM mode select | Choose for cost-sensitive industrial applications where RESET supervision and ultra-low IQ are nonessential. |
Compared with TPS62840DLCR and RT7297CGJ6F, the MAX77596ETBB+ uniquely combines 24V input tolerance, 1.1µA IQ, integrated RESET, and MODE-selectable operation-making it the only option suitable for USB-C PD receivers and multi-cell Li-ion portable systems requiring both wide VIN and long battery life.
Availability
MAX77596ETBB+ is available at Aetrix Electronics and suitable for portable medical sensors, USB-C power delivery receivers, and industrial handheld scanners requiring stable component supply across extended product lifecycles.
Supply support for MAX77596ETBB+ 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 demanding industrial, automotive, and consumer applications.
The MAX77596 series targets ultra-low-power, wide-input-voltage DC-DC conversion in space-constrained portable electronics-emphasizing battery longevity, thermal resilience, and integration of supervision features like RESET and BIAS LDO.
FAQ
What is the guaranteed output voltage accuracy of the MAX77596ETBB+ over full load and temperature?
The MAX77596ETBB+ guarantees 3.3V output within ±3% (3.1V to 3.4V) across 0–300mA load and –40°C to +85°C ambient temperature, as specified in the Electrical Characteristics table under VOUT,3.3V parameter. This accuracy is achieved via factory trimming and does not require external calibration or feedback resistors.
Does the MAX77596ETBB+ require an external feedback resistor network?
No, the MAX77596ETBB+ does not require an external feedback resistor network. As a fixed 3.3V output variant, it uses internal feedback and connects Pin 9 (OUT/FB) directly to the output node. External resistors are only needed for the adjustable MAX77596ETBC+ version.
How is thermal performance managed in the MAX77596ETBB+ 10-pin TDFN package?
The MAX77596ETBB+ uses an exposed pad (EP) thermally connected to PGND, achieving a junction-to-ambient thermal resistance of 102°C/W on a standard four-layer board. Effective heat dissipation requires soldering EP to a large copper plane with multiple vias, as detailed in the PCB Layout Guidelines section of the datasheet.
Can the MAX77596ETBB+ operate with input voltage below 3.5V?
No, the MAX77596ETBB+ has a minimum specified input voltage of 3.5V per Absolute Maximum Ratings and Electrical Characteristics. Operation below this level is not guaranteed and may result in dropout, regulation loss, or UVLO activation. Its 98% max duty cycle supports operation down to ~3.38V input only when VOUT = 3.3V, but 3.5V remains the validated lower limit.
What protection features are integrated into the MAX77596ETBB+?
The MAX77596ETBB+ integrates cycle-by-cycle current limiting, hiccup-mode short-circuit protection (15-cycle shutdown followed by 16.5ms retry), thermal shutdown at +175°C with 15°C hysteresis, and undervoltage lockout (UVLO) that disables switching when VBIAS drops below 2.8V. These features protect both the IC and downstream circuitry under fault conditions.
MAX77596ETBB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 300mA
- Frequency - Switching:
- 1.7MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (2.5x2)
MAX77596ETBB+ FAQ
1.How can I place an order for MAX77596ETBB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77596ETBB+ 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 MAX77596ETBB+ reliable?
The price and inventory of MAX77596ETBB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77596ETBB+ is usually 5 days.
3.What payment methods are accepted for MAX77596ETBB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77596ETBB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77596ETBB+?
MAX77596ETBB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77596ETBB+ 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 MAX77596ETBB+?
For technical support, including MAX77596ETBB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77596ETBB+ requirements.
6.How does Aetrix verify that MAX77596ETBB+ is sourced from the original manufacturer or authorized distributors?
All MAX77596ETBB+ 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 MAX77596ETBB+ meets industry standards.
7.What is the process for return or replacement of MAX77596ETBB+?
All MAX77596ETBB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77596ETBB+, 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 MAX77596ETBB+ part is unused and in its original packaging.
Return procedure for MAX77596ETBB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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