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Analog Devices Inc./Maxim Integrated MAX77597ETBB+T
- Part No.:
- MAX77597ETBB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX77597ETBB+T.pdf
- Description:
- IC REG BUCK 3.3V 300MA 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,020
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Product details
Overview
MAX77597ETBB+T from Maxim Integrated is a synchronous buck converter IC delivering up to 300mA at fixed 3.3V output, operating from 3.5V–36V input with 1.1µA quiescent current in skip mode and 1.7MHz switching frequency-ideal for Li+-battery-powered portable devices requiring ultra-low-power regulation.
For engineers reviewing the MAX77597ETBB+T datasheet, MAX77597ETBB+T pinout, MAX77597ETBB+T application, or MAX77597ETBB+T equivalent, key selection criteria include its 98% max duty cycle for near-dropout operation, integrated high/low-side DMOS (2200mΩ/1200mΩ), RESET monitoring capability, and 2mm × 2.5mm TDFN-10EP package suitability for space-constrained point-of-load designs.
Technical Context
The MAX77597ETBB+T implements peak current-mode control with integrated slope compensation and load-line voltage positioning-enabling critically damped transient response and reduced output capacitance requirements. Its internal 5V BIAS regulator powers control circuitry and eliminates external bias supplies.
It supports dual operating modes via the MODE pin: forced-PWM for constant-frequency noise filtering and skip mode for ultra-low IQ (1.1µA) at light loads. Protection includes cycle-by-cycle current limiting, thermal shutdown at +175°C with 15°C hysteresis, and short-circuit recovery with 6.67ms soft-start and 16.5ms fault retry delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.5V to 36V - supports direct connection to 2S–4S Li+ batteries (6–16.8V), USB Type-C PD sources (5–20V), and industrial 12V/24V rails. |
| IOUT Max | 300mA - sufficient for powering microcontrollers, sensors, and low-power peripherals in portable systems. |
| VOUT | Fixed 3.3V ±3.3% (3.1V–3.4V) - tightly regulated output without external feedback resistors; simplifies design and improves accuracy. |
| fSW | 1.7MHz (1.58–1.82MHz) - enables use of small 10µH inductors and compact 22µF ceramic output capacitors. |
| IQ (Skip Mode) | 1.1µA - extends battery runtime in always-on or sleep-state applications such as wearables and IoT endpoints. |
| Duty Cycle Max | 98% - maintains regulation down to VIN ≈ VOUT / 0.98 = ~3.37V, enabling operation during deep battery discharge. |
| RESET Threshold | 92% VOUT rising / 90% VOUT falling - provides precise power-good signaling for system sequencing and brownout detection. |
Pinout & Package
MAX77597ETBB+T is housed in a 2.0mm × 2.5mm × 0.75mm, 10-pin TDFN package with exposed pad (EP) for thermal dissipation. The EP must be soldered to a large PGND copper plane using multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BST | Bootstrap supply for high-side driver | Requires 0.1µF ceramic capacitor between BST and LX; enables efficient high-side MOSFET gate drive. |
| 2 SUP | Main power input | Accepts 3.5V–36V; requires ≥4.7µF ceramic decoupling capacitor placed adjacent to pin for high-frequency noise suppression. |
| 3 LX | Switching node | Connects to inductor; high-impedance when off; critical for EMI-sensitive layout-keep trace short and direct. |
| 4 PGND | Power ground return | Must connect to AGND under device in star configuration; serves as primary return path for high-current switching loop. |
| 5 AGND | Analog ground reference | Separate from PGND except at single point (output capacitor return); shields error amplifier and feedback sensing. |
| 6 RESET | Open-drain reset output | Active-low signal indicating VOUT < 90% nominal; requires external pullup resistor for host processor reset or status monitoring. |
| 7 MODE | Operating mode select | Ground or open = skip mode (1.1µA IQ); connect to BIAS = forced-PWM; internal 1MΩ pulldown ensures default skip behavior. |
| 8 BIAS | Internal 5V LDO output | Powers internal logic; requires 1µF ceramic capacitor to AGND; must not be loaded externally to maintain regulation. |
| 9 OUT | Output voltage sense (fixed version) | Internally connected to 3.3V reference; bypass to PGND with ≥22µF X5R ceramic capacitor for stability and transient response. |
| 10 EN | Enable control input | Logic-high (>2.4V) enables regulation; logic-low (<0.4V) places device in shutdown (0.75–3.0µA ISUP). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high/low-side DMOS switches | Eliminates need for external MOSFETs; RDS(ON) = 2200mΩ (HS) / 1200mΩ (LS) reduces conduction loss and board area. |
| Current-mode control with load-line architecture | Provides fast, critically damped load transient response and reduces required output capacitance by up to 30% vs. voltage-mode controllers. |
| 6.67ms internal soft-start | Prevents inrush current during startup; avoids input rail collapse and protects upstream power sources. |
| 42V input tolerance (transient) | Withstands automotive load-dump surges and industrial line transients without external clamping components. |
| Thermal and short-circuit protection | Auto-retry shutdown at +175°C and hard-short recovery with 16.5ms cooldown prevents latch-up and enables robust field operation. |
Applications
| Portable Medical Sensors | USB-C Power Delivery Accessories |
|---|---|
|
Use Scenario: Wearable ECG patch powered by 3S Li+ battery (9–12.6V) with sleep-mode current budget <2µA. IC Role / Device Role / Timing Role: Primary 3.3V supply for ultra-low-power MCU and analog front-end; regulates across full battery discharge curve. Use Value: 1.1µA skip-mode IQ and 98% duty cycle extend usable battery life by >40% versus conventional buck converters. |
Use Scenario: USB-C dock supplying 3.3V to embedded controller and USB interface logic from variable 5–20V PD source. IC Role / Device Role / Timing Role: Point-of-load regulator converting PD bus voltage to stable 3.3V; handles rapid input voltage transitions during PD negotiation. Use Value: 1.7MHz switching and integrated compensation enable compact 10µH/22µF solution with minimal footprint and no external loop components. |
| Industrial Handheld Scanners | Smart Home Edge Nodes |
|
Use Scenario: Rugged barcode scanner operating from 2S Li+ (6–8.4V) with frequent pulse-load peaks up to 300mA. IC Role / Device Role / Timing Role: Main system rail regulator; delivers consistent 3.3V despite battery sag and motor-induced transients. Use Value: Load-line architecture and 100mA load-step transient response <100µs ensure clean digital logic operation without brownouts. |
Use Scenario: Battery-backed Zigbee/BLE gateway requiring always-on 3.3V supply with firmware update capability over low-power radio. IC Role / Device Role / Timing Role: Always-on power rail; monitors VOUT via RESET signal to trigger safe firmware rollback on undervoltage. Use Value: Precise 92%/90% RESET thresholds provide reliable power-good signaling without external comparators or voltage dividers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | Lower IQ (0.075µA), but narrower VIN range (1.8V–5.5V); no RESET output; 2.25MHz fSW. | Suitable only for single-cell Li+ or 3.3V/5V rail-down conversion-not viable for 2S–4S battery or USB-C input. | Select when ultra-deep sleep current dominates and input voltage is strictly ≤5.5V. |
| MP2451DT-LF-Z | Wider VIN (4.5V–36V), higher IOUT (600mA), but higher IQ (26µA); no integrated BIAS LDO or RESET; external compensation required. | Supports higher load currents and same input range, but demands more design effort and larger solution size. | Select when >300mA output or lower cost per amp is prioritized over IQ and integration. |
Compared with TPS62840DLCR and MP2451DT-LF-Z, the MAX77597ETBB+T uniquely balances wide-input operation (3.5V–36V), ultra-low IQ (1.1µA), integrated RESET and BIAS LDO, and minimal external component count-making it optimal for compact, battery-sensitive applications where both input flexibility and standby efficiency are critical.
Availability
MAX77597ETBB+T is available at Aetrix Electronics and suitable for portable medical sensors, USB-C accessories, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX77597ETBB+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 demanding industrial, automotive, and consumer applications.
The MAX77597 belongs to Maxim's ultra-low-power DC-DC converter product line, engineered specifically for battery-operated systems needing high integration, minimal quiescent current, and robust operation across wide input voltage ranges.
FAQ
What is the maximum input voltage rating for MAX77597ETBB+T, and how does it handle transients?
The MAX77597ETBB+T has an absolute maximum input voltage rating of +42V for durations under 500ms, allowing it to withstand automotive load-dump events and industrial power surges without external protection. Its normal operating VIN range remains 3.5V to 36V, and the 42V tolerance is specified under transient conditions per the Absolute Maximum Ratings table-ensuring reliability in harsh environments while maintaining safe continuous operation within the 36V limit.
Does MAX77597ETBB+T require external compensation components?
No, the MAX77597ETBB+T integrates full error-amplifier compensation and slope-compensation circuitry, eliminating the need for external compensation networks. This simplifies design, reduces bill-of-materials count, and improves consistency across production units-confirmed in the Detailed Description section stating "requires no external compensation network" and validated by the fixed-output configuration with internal feedback.
How is the RESET output configured, and what are its threshold tolerances?
The RESET output of MAX77597ETBB+T is an open-drain signal requiring an external pullup resistor. It asserts low when VOUT falls below 90% of nominal (3.3V), with a typical threshold of 2.97V and ±2% tolerance (2.84V–3.10V). It releases high when VOUT rises above 92% (3.04V), with tolerance of ±2% (2.92V–3.16V), providing precise power-good monitoring for system sequencing and fault detection.
Can MAX77597ETBB+T operate with a 5V input, and what is its efficiency at that condition?
Yes, MAX77597ETBB+T operates efficiently from 5V input. At VSUP = 5V, VOUT = 3.3V, and IOUT = 100mA, typical efficiency is 82% in skip mode and 84% in forced-PWM mode-per Figure toc04 in the datasheet. Its 1.7MHz switching frequency and integrated MOSFETs maintain high light-load efficiency, making it well-suited for USB-powered applications.
What is the thermal performance of MAX77597ETBB+T in its TDFN-10EP package?
The MAX77597ETBB+T in the 2mm × 2.5mm TDFN-10EP package has a junction-to-ambient thermal resistance (θJA) of 102°C/W and junction-to-case (θJC) of 2.9°C/W, measured per JEDEC JESD51-7 on a four-layer board. With proper PCB layout-including soldering the exposed pad to a large PGND copper plane using multiple vias-the device sustains full 300mA load at +85°C ambient without thermal shutdown.
MAX77597ETBB+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):
- 36V
- 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)
MAX77597ETBB+T FAQ
1.How can I place an order for MAX77597ETBB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77597ETBB+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 MAX77597ETBB+T reliable?
The price and inventory of MAX77597ETBB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77597ETBB+T is usually 5 days.
3.What payment methods are accepted for MAX77597ETBB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77597ETBB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77597ETBB+T?
MAX77597ETBB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77597ETBB+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 MAX77597ETBB+T?
For technical support, including MAX77597ETBB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77597ETBB+T requirements.
6.How does Aetrix verify that MAX77597ETBB+T is sourced from the original manufacturer or authorized distributors?
All MAX77597ETBB+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 MAX77597ETBB+T meets industry standards.
7.What is the process for return or replacement of MAX77597ETBB+T?
All MAX77597ETBB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77597ETBB+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 MAX77597ETBB+T part is unused and in its original packaging.
Return procedure for MAX77597ETBB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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