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Analog Devices Inc./Maxim Integrated MAX77596ETBB+T
- Part No.:
- MAX77596ETBB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX77596ETBB+T.pdf
- Description:
- IC REG BUCK 3.3V 300MA 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,405
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Product details
Overview
MAX77596ETBB+T from Maxim Integrated is a synchronous buck converter IC delivering up to 300mA output at fixed 3.3V with input voltage range 3.5V–24V, 1.1µA quiescent current in skip mode, and 1.7MHz switching frequency-designed for Li+-battery-powered portable devices requiring ultra-low-power regulation.
For engineers reviewing the MAX77596ETBB+T datasheet, MAX77596ETBB+T pinout, MAX77596ETBB+T application, or MAX77596ETBB+T equivalent, key selection criteria include dropout performance (98% max duty cycle), RESET monitoring capability, thermal/short-circuit protection, and compatibility with 2s–4s Li+ battery stacks and USB Type-C 5V/12V/20V inputs.
Technical Context
The MAX77596ETBB+T implements current-mode PWM control with integrated high-side current sensing and no external compensation required. It supports dual operating modes: forced-PWM (constant 1.7MHz) and skip mode (ultra-low 1.1µA IQ), selected via MODE pin logic level.
Its architecture includes an internal 5V BIAS LDO, open-drain RESET output with 90–94% VOUT threshold hysteresis, and robust fault handling-thermal shutdown at +175°C with +15°C hysteresis, cycle-by-cycle current limit (500mA typ), and short-circuit recovery with 16.5ms retry delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.5V to 24V - supports direct connection to 2s/3s/4s Li+ batteries and USB Type-C power rails. |
| IOUT Max | 300mA - sufficient for powering microcontrollers, sensors, and low-power peripherals in portable systems. |
| VOUT Accuracy | ±3% (3.1V–3.4V @ 3.3V nominal) - ensures stable supply for sensitive analog/digital circuitry without external trimming. |
| Quiescent Current | 1.1µA (skip mode, no load) - extends battery runtime in always-on or sleep-state applications. |
| Switching Frequency | 1.7MHz (1.58–1.82MHz) - enables use of compact 10µH inductors and low-ESR ceramic capacitors. |
| Duty Cycle Max | 98% - maintains regulation down to VIN ≈ VOUT / 0.98, critical for deep battery discharge operation. |
| RESET Threshold | 92% VOUT rising, 90% VOUT falling - provides reliable power-good signaling for system sequencing and brownout detection. |
| Operating Temp | −40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
The MAX77596ETBB+T is housed in a 2.0mm × 2.5mm × 0.75mm, 10-pin TDFN package with exposed pad (EP) for thermal dissipation. Pin 1 is BST; EP must be soldered to PGND via large copper area and multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side driver | Requires 0.1µF capacitor between BST and LX; enables efficient high-side MOSFET gate drive. |
| SUP | Main power input | Accepts 3.5V–24V; requires ≥4.7µF ceramic decoupling capacitor close to pin. |
| LX | Switching node | Connects to inductor; high-impedance when disabled; carries high di/dt during switching. |
| PGND | Power ground return | Must connect to AGND under device in star configuration; carries high pulsed currents. |
| AGND | Analog ground reference | Separate from PGND except at single point (output capacitor return); minimizes noise coupling into feedback path. |
| RESET | Open-drain reset output | Requires external pullup; asserts low when VOUT falls below 90% of nominal; used for system power sequencing. |
| MODE | Operating mode select | Ground or floating = skip mode (1.1µA IQ); tied to BIAS = forced-PWM (constant 1.7MHz). |
| BIAS | Internal 5V LDO output | Supplies internal logic; requires 1µF ceramic cap to AGND; must not be externally loaded. |
| OUT/FB | Output voltage sense / feedback | Fixed-output version: connects directly to regulated 3.3V output; bypass with ≥22µF X5R ceramic capacitor. |
| EN | Enable control input | High-voltage compatible (2.4V VIH); drives low to disable; draws only 0.1µA input current. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.1µA in skip mode enables >1-year battery life in IoT sensor nodes with periodic wake-up. |
| 98% max duty cycle | Allows regulation down to VIN = 3.37V at 3.3V output-critical for maintaining operation through full 2s Li+ discharge curve. |
| Integrated 5V BIAS LDO | Eliminates need for external bias rail; reduces BOM count and layout complexity while ensuring stable internal logic supply. |
| Current-mode control | Provides inherent line regulation, simplified loop stability, and precise cycle-by-cycle inductor current limiting without external compensation. |
| Robust protection suite | Includes thermal shutdown (+175°C), short-circuit recovery (15-cycle limit + 16.5ms retry), and undervoltage lockout (3.2V typ). |
| RESET with hysteresis | 92%/90% VOUT thresholds with 12µs debounce ensure glitch-free power-good assertion during load transients and brownouts. |
Applications
| Wearable Health Monitor | USB-C Powered Smart Sensor Hub |
|---|---|
Use Scenario: Continuous ECG/PPG signal acquisition powered by a 3s Li+ battery with multi-day runtime requirement. IC Role / Device Role / Timing Role: Primary 3.3V power rail regulator for MCU, analog front-end, and BLE radio-operating in skip mode during sensor idle periods. Use Value: 1.1µA IQ extends battery life by >35% vs. conventional buck converters; 98% duty cycle sustains regulation until battery drops to 3.37V. | Use Scenario: Compact environmental sensor node drawing power from USB-C PD source (5V/9V/15V/20V). IC Role / Device Role / Timing Role: Input-flexible step-down regulator converting variable USB-C voltage to stable 3.3V for SoC and sensors. Use Value: 3.5V–24V input range eliminates need for pre-regulator; 1.7MHz switching allows <2mm² total solution size including inductor and caps. |
| Industrial Handheld Scanner | Low-Power GPS Tracker |
Use Scenario: Ruggedized barcode scanner using 4s Li+ pack, requiring cold-temperature operation down to −40°C. IC Role / Device Role / Timing Role: Main 3.3V supply for imaging processor, laser driver, and wireless module-enabling fast wake-from-sleep response. Use Value: −40°C to +85°C rating ensures reliability in field conditions; RESET output coordinates safe firmware boot after power-up. | Use Scenario: Asset tracker transmitting location every 15 minutes using GPS + cellular modem, powered by 2s Li+ cell. IC Role / Device Role / Timing Role: Efficient 3.3V regulator enabling deep-sleep current <2µA system-wide; operates in skip mode between transmissions. Use Value: 1.1µA IQ dominates system standby power budget; soft-start (6.67ms) prevents inrush-induced voltage sag on weak battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DRVR | 1.8V–6.5V input, 300mA, 0.065µA IQ - narrower VIN range, lower IQ, but no RESET output or 24V tolerance. | Best for ultra-low-power coin-cell or single-Li+ systems where 24V input and RESET monitoring are unnecessary. | Select MAX77596ETBB+T when 24V input support, RESET signaling, or 2s–4s Li+ compatibility is required. |
| MP2152GQZ-P | 4.5V–24V input, 600mA, 2.5µA IQ, 2.2MHz - higher current, higher IQ, no integrated BIAS LDO or RESET. | Suitable for higher-load applications needing margin, but lacks integrated monitoring and bias functions. | Choose MAX77596ETBB+T for space-constrained designs needing RESET, BIAS, and lowest possible IQ in 300mA class. |
Compared with TPS62840DRVR and MP2152GQZ-P, the MAX77596ETBB+T uniquely combines 24V input tolerance, 1.1µA IQ, integrated 5V BIAS LDO, and open-drain RESET in a 2.5mm × 2.0mm footprint-making it optimal for battery-powered portable systems demanding comprehensive power management in minimal area.
Availability
MAX77596ETBB+T is available at Aetrix Electronics and suitable for portable medical devices, USB-C peripheral power supplies, and industrial handheld instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX77596ETBB+T 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 industrial, automotive, communications, and consumer applications.
The MAX77596 series targets ultra-low-power, wide-input-voltage DC-DC conversion in space-constrained portable electronics-emphasizing battery longevity, robustness, and integration of monitoring and bias functions.
FAQ
What is the maximum input voltage the MAX77596ETBB+T can withstand transiently?
The MAX77596ETBB+T supports up to 42V input voltage for durations less than 500ms, as specified in Absolute Maximum Ratings. This transient tolerance allows safe operation during load-dump events or hot-plug scenarios in USB-C and industrial power systems, though continuous operation must remain within 3.5V–24V.
Does the MAX77596ETBB+T require external compensation components?
No, the MAX77596ETBB+T uses an integrated current-mode control architecture with built-in error amplifier compensation. No external compensation network is needed-reducing design complexity, PCB area, and component count while ensuring stable operation across all load and input conditions.
How does the RESET output of the MAX77596ETBB+T behave during startup and fault conditions?
The MAX77596ETBB+T RESET output remains low until VOUT rises above 92% of 3.3V (≈3.04V), then goes high-impedance. It pulls low again if VOUT drops below 90% (≈2.97V). During short-circuit or UVLO faults, RESET asserts low after soft-start timeout, providing unambiguous system-level fault indication independent of EN state.
Can the MAX77596ETBB+T operate from a single 3.7V Li-ion cell?
No-the MAX77596ETBB+T has a minimum input voltage of 3.5V, and its 98% max duty cycle yields only ~3.37V output from 3.5V input. A single discharged Li-ion cell (<3.4V) cannot sustain regulation. The device is intended for 2s (7.2V–8.4V), 3s (10.8V–12.6V), or 4s (14.4V–16.8V) Li+ packs, or USB-C sources.
What is the purpose of the BIAS pin on the MAX77596ETBB+T, and how should it be used?
The BIAS pin delivers a regulated 5V output powering internal circuitry. It must be bypassed with a 1µF ceramic capacitor to AGND and must not be externally loaded. In forced-PWM mode, MODE is tied to BIAS-so correct BIAS decoupling is essential for stable mode switching and overall converter reliability.
MAX77596ETBB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 1.75MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (2.5x2)
MAX77596ETBB+T FAQ
1.How can I place an order for MAX77596ETBB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77596ETBB+T 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+T reliable?
The price and inventory of MAX77596ETBB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77596ETBB+T is usually 5 days.
3.What payment methods are accepted for MAX77596ETBB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77596ETBB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77596ETBB+T?
MAX77596ETBB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77596ETBB+T 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+T?
For technical support, including MAX77596ETBB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77596ETBB+T requirements.
6.How does Aetrix verify that MAX77596ETBB+T is sourced from the original manufacturer or authorized distributors?
All MAX77596ETBB+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX77596ETBB+T?
All MAX77596ETBB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77596ETBB+T, 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+T part is unused and in its original packaging.
Return procedure for MAX77596ETBB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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