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Analog Devices Inc./Maxim Integrated MAX887HESA+
- Part No.:
- MAX887HESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX887HESA+.pdf
- Description:
- IC REG BUCK ADJ 600MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,596
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Product details
Overview
The MAX887HESA+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter delivering up to 600mA with adjustable output (1.25V–10.5V) from a 3.5V–11V input. It features 100% duty-cycle operation (300mV dropout at 500mA), internal 0.6Ω P-channel MOSFET, and fixed 300kHz PWM switching. Used in portable instrumentation and cellular radios for stable low-noise power conversion.
For engineers reviewing the MAX887HESA+ datasheet, MAX887HESA+ pinout, MAX887HESA+ application, or MAX887HESA+ equivalent, key selection criteria include dropout performance at light-to-heavy loads, SYNC-controlled mode switching between PWM and Idle Mode™, internal synchronous rectifier integration, and guaranteed –40°C to +85°C industrial temperature operation.
Technical Context
The MAX887HESA+ employs current-mode PWM control with cycle-by-cycle current limiting and slope compensation, enabling fast load/line transient response and stable regulation across 1.25V–10.5V outputs. Its oscillator-triggered minimum/maximum on-time architecture supports 100% duty cycle when VIN approaches VOUT, with dropout governed by RON (0.6Ω typ) and external inductor DCR.
SYNC input enables three operating modes: forced PWM (SYNC = VL), Idle Mode™ PFM (SYNC = GND), or external clock synchronization (25kHz–440kHz). Internal 3.3V VL regulator powers logic circuitry and requires local 2.2µF bypassing; REF pin supplies 1.25V reference with 0.047µF bypass.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 600mA max continuous; limited by thermal dissipation and internal 1.4A current limit (ILIM+). |
| Input Voltage Range | 3.5V to 11V; UVLO threshold 3.0V–3.3V ensures clean startup under weak battery conditions. |
| Output Voltage Range | 1.25V to 10.5V; set via resistor divider on FB pin using VFB = 1.250V ±2.5%. |
| Switching Frequency | 260kHz–340kHz (typ 300kHz); fixed internal oscillator or externally synchronized via SYNC pin. |
| Efficiency | Up to 95% at mid-load; enabled by synchronous rectification and low RON (0.6Ω) internal P-MOSFET. |
| Shutdown Current | 2.5µA typ at V+ = 7V; reduces system standby power in battery-powered applications. |
| Duty Cycle | 100% supported; minimizes dropout voltage-e.g., 300mV at 500mA for 3.3V output. |
Pinout & Package
MAX887HESA+ uses an 8-pin SO (Small Outline) package, 150-mil width, with exposed pad not electrically connected. Pin spacing is 1.27mm, body dimensions 4.0mm × 5.0mm × 1.27mm (max height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Logic-level input; tie to V+ for normal operation, GND for 2.5µA shutdown state. |
| 2 FB | Feedback sensing node | Monitors output via resistor divider; regulates based on 1.250V reference with ±0.025V tolerance. |
| 3 REF | Reference voltage output | Provides stable 1.25V reference; requires 0.047µF ceramic capacitor within 5mm for noise immunity. |
| 4 VL | Internal logic regulator output | 3.3V supply for internal circuitry; must be bypassed with 2.2µF capacitor near pin for stability. |
| 5 GND | Power and signal ground | Common return for all analog/digital blocks; star-ground connection critical for EMI control. |
| 6 SYNC | Oscillator control and mode select | Logic-level input: VL = forced PWM, GND = Idle Mode™, external clock edge = synchronized PWM. |
| 7 LX | Switch node | Drain of internal P-MOSFET; connects to inductor; handles high di/dt-requires short, wide PCB trace. |
| 8 V+ | Main power input | 3.5V–11V supply; requires parallel 0.33µF ceramic + bulk electrolytic capacitor within 5mm. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables ultra-low dropout (300mV @ 500mA) without external components-critical for Li-ion battery end-of-discharge support. |
| Synchronous rectification | Reduces conduction loss vs. external Schottky diode; improves efficiency by ~3–5% at medium-to-heavy loads. |
| Idle Mode™ (PFM) | Reduces quiescent current to 200µA typ at light loads (<100mA), extending battery life in portable instruments. |
| Current-mode PWM control | Delivers superior line/load transient response (e.g., <20µs recovery from 0→500mA step) and inherent cycle-by-cycle overcurrent protection. |
| SYNC frequency flexibility | Supports external clock synchronization (25–440kHz) to avoid RF/data-acquisition band interference-no layout changes needed. |
Applications
| Portable Instrumentation | Cellular Radios |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring stable 3.3V/5V rails from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator supplying ADC, microcontroller, and display drivers with low-noise, low-dropout power. Use Value: 100% duty-cycle operation maintains regulation down to 3.3V input, while 95% peak efficiency extends battery runtime. | Use Scenario: RF front-end power in GSM/CDMA transceivers where switching noise must avoid IF bands (e.g., 217Hz, 13MHz). IC Role / Device Role / Timing Role: Synchronized PWM DC-DC converter locked to system clock to eliminate beat frequencies and spurious emissions. Use Value: SYNC input allows precise 300kHz alignment or offset to avoid sensitive receiver bands-verified in typical operating characteristics. |
| Personal Communicators | Distributed Power Systems |
Use Scenario: PDAs and early smartphones needing multiple regulated voltages (e.g., 1.8V core, 3.3V I/O) from compact 3.7V battery. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured as 1.8V rail with external feedback resistors and local 2.2µF VL bypass. Use Value: Internal 0.6Ω MOSFET and synchronous rectifier eliminate external high-side switch, reducing BOM count and board area. | Use Scenario: Point-of-load regulation in industrial controllers where remote 5V/12V bus supplies isolated 3.3V logic rails. IC Role / Device Role / Timing Role: Local DC-DC converter providing tightly regulated 3.3V with ±2% line/load regulation and –40°C to +85°C operation. Use Value: Guaranteed industrial temp range (MAX887HESA+) and 0.2%/V line regulation ensure reliability in uncontrolled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3-MHz fixed-frequency, 600mA sync buck; lower IQ (18µA) but no 100% duty cycle; 2.05–6.5V input. | Optimized for ultra-low-power wearables; unsuitable for sub-3.3V dropout scenarios due to min-on-time limitation. | Select when higher switching frequency and smaller inductors are prioritized over dropout performance. |
| LT1934ES5-3.3#TRMPBF | 600mA micropower buck; 1.8–10V input; 3.3V fixed output; 100% duty cycle supported; 2.5µA shutdown. | Fixed 3.3V output only; lacks adjustable FB and SYNC flexibility; wider input range but no synchronization capability. | Choose for drop-in 3.3V replacement where programmability and noise control are secondary to simplicity. |
Compared with TPS62231DRVR and LT1934ES5-3.3#TRMPBF, the MAX887HESA+ uniquely combines adjustable output, 100% duty cycle, SYNC-based noise management, and industrial temperature rating-making it optimal for portable instrumentation requiring robust low-VIN operation and EMI control.
Availability
MAX887HESA+ is available at Aetrix Electronics and suitable for portable instrumentation, cellular radios, personal communicators, and distributed power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX887HESA+ 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, medical, and communications applications.
The MAX887HESA+ belongs to Maxim's high-efficiency DC-DC converter product line, engineered specifically for battery-powered portable equipment requiring low-noise, low-dropout, and thermally robust power conversion.
FAQ
What is the maximum output current capability of the MAX887HESA+?
The MAX887HESA+ delivers up to 600mA continuous output current under typical conditions (V+ = 7V, TA = +25°C). The actual achievable current depends on input voltage, ambient temperature, PCB thermal design, and inductor saturation rating. Electrical Characteristics specify ILIM+ = 0.75A–1.4A (min–max), with guaranteed 600mA output in the typical operating circuit per Figure 2.
Does the MAX887HESA+ support 100% duty-cycle operation, and what is its practical dropout voltage?
Yes, the MAX887HESA+ supports true 100% duty-cycle operation to minimize dropout. At 500mA load, dropout voltage is 300mV typical-calculated as IOUT × RON (0.6Ω) plus inductor DCR contribution. This enables regulation with input as low as 3.3V for a 3.3V output, critical for single-cell Li-ion applications nearing end-of-discharge.
How does the SYNC pin function on the MAX887HESA+, and what are its valid operating modes?
The SYNC pin on the MAX887HESA+ controls operating mode and switching frequency: tied to VL enables forced PWM at ~300kHz; tied to GND activates Idle Mode™ (PFM) for 200µA quiescent current at light loads; driven by external clock (25–440kHz) synchronizes switching to avoid RF interference. Floating SYNC is prohibited per datasheet.
What is the purpose of the VL pin on the MAX887HESA+, and how must it be decoupled?
The VL pin on the MAX887HESA+ provides a regulated 3.3V supply for internal logic circuitry. It must be bypassed with a 2.2µF ceramic or tantalum capacitor placed within 5mm (0.2 inches) of the pin and connected directly to GND. Failure to properly decouple VL risks instability, erratic shutdown behavior, or degraded transient response.
What temperature range is guaranteed for the MAX887HESA+, and how does it differ from other MAX887 variants?
The MAX887HESA+ is specified for –40°C to +85°C operation, verified across the full range per Electrical Characteristics tables. This distinguishes it from the MAX887HC/D (0°C to +70°C) and confirms suitability for industrial and automotive-adjacent portable equipment where ambient extremes are expected. The "HESA" suffix explicitly denotes this extended temperature grade.
MAX887HESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 11V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 10.5V
- Current - Output:
- 600mA
- Frequency - Switching:
- 250kHz ~ 350kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX887HESA+ FAQ
1.How can I place an order for MAX887HESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX887HESA+ 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 MAX887HESA+ reliable?
The price and inventory of MAX887HESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX887HESA+ is usually 5 days.
3.What payment methods are accepted for MAX887HESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX887HESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX887HESA+?
MAX887HESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX887HESA+ 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 MAX887HESA+?
For technical support, including MAX887HESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX887HESA+ requirements.
6.How does Aetrix verify that MAX887HESA+ is sourced from the original manufacturer or authorized distributors?
All MAX887HESA+ 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 MAX887HESA+ meets industry standards.
7.What is the process for return or replacement of MAX887HESA+?
All MAX887HESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX887HESA+, 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 MAX887HESA+ part is unused and in its original packaging.
Return procedure for MAX887HESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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