My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX887HESA+T
- Part No.:
- MAX887HESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX887HESA+T.pdf
- Description:
- IC REG BUCK ADJ 600MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:10,305
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX887HESA+T from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter delivering up to 600mA with adjustable output (1.25V–10.5V), 3.5V–11V input range, and 100% duty-cycle operation enabling ultra-low dropout (300mV at 500mA). It features internal 0.6Ω P-channel MOSFET, synchronous rectification, and fixed 300kHz PWM switching-designed for battery-powered portable instruments and RF-sensitive cellular radios.
For engineers reviewing the MAX887HESA+T datasheet, MAX887HESA+T pinout, MAX887HESA+T application, or MAX887HESA+T equivalent, key selection criteria include dropout performance at light-to-heavy loads, SYNC-controlled mode switching between PWM and Idle Mode™, internal VL regulator stability, and thermal derating in SO-8 packages under continuous 600mA operation.
Technical Context
The MAX887HESA+T employs current-mode PWM control with cycle-by-cycle current limiting (ILIM+ = 0.75A–1.4A) and slope compensation to ensure stability across 260kHz–340kHz oscillator variation. Its 100% duty-cycle capability is enabled by fOSC/4 maximum on-time, allowing regulation down to VIN ≈ VOUT + (IOUT × RON,LX).
It integrates dual operating modes: forced PWM (SYNC tied to VL) for low-noise RF/data-acquisition systems, and Idle Mode™ (SYNC grounded) for 200µA typ quiescent current at light loads. The internal 3.3V VL regulator powers logic circuitry and requires local 2.2µF bypassing; REF provides a stable 1.25V reference with 0.047µF bypass.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 600mA guaranteed; supports full load across -40°C to +85°C industrial temperature range. |
| Input Voltage Range | 3.5V to 11V; UVLO threshold 3.0V–3.3V ensures clean startup and brownout recovery. |
| Output Voltage Range | 1.25V to 10.5V; set via external resistor divider referenced to 1.25V FB threshold (±2.5mV typical). |
| Switching Frequency | 260kHz–340kHz (guaranteed); internally fixed at 300kHz unless synchronized externally (25kHz–440kHz). |
| Efficiency | Up to 95% at mid-load; achieved via synchronous rectification and low RON,LX (0.6Ω typ) internal MOSFET. |
| Dropout Voltage | 300mV typ at 500mA; enabled by 100% duty-cycle operation minimizing conduction loss in dropout region. |
| Shutdown Current | 2.5µA typ; enables long battery standby in portable instrumentation and handheld radios. |
| Quiescent Current | 2.7mA–4.0mA in PWM mode; drops to 200µA typ in Idle Mode™ (PFM) below 100mA load. |
Pinout & Package
MAX887HESA+T is housed in an 8-pin narrow SO (Small Outline) package, 0.150" body width, with exposed pad not electrically connected. Pin pitch is 1.27mm; recommended reflow profile complies with JEDEC J-STD-020C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control input | Pull to GND to disable regulator; draws only 2.5µA in shutdown; must be tied to V+ for normal operation. |
| 2 - FB | Feedback voltage sensing node | Compares output voltage against 1.25V internal reference; ±0.1µA input bias enables high-impedance resistor dividers. |
| 3 - REF | Reference voltage output | Provides stable 1.25V reference; requires 0.047µF ceramic capacitor within 5mm for noise immunity and loop stability. |
| 4 - VL | Internal 3.3V logic supply output | Powers internal control circuitry; must be bypassed with 2.2µF capacitor within 5mm to maintain regulation and SYNC timing integrity. |
| 5 - GND | Analog/digital ground reference | Common return for REF, FB, SYNC, SHDN, and power ground; star-ground connection critical for noise rejection. |
| 6 - SYNC | Oscillator synchronization & mode select | Tie to VL for forced PWM; tie to GND for Idle Mode™; accepts external clock edges (25–440kHz) for EMI reduction in RF systems. |
| 7 - LX | Switch node connection | Drain of internal P-channel MOSFET; connects to inductor; high dv/dt node requiring short, low-inductance routing. |
| 8 - V+ | Main power input | 3.5V–11V supply; requires parallel 0.33µF ceramic + bulk electrolytic capacitor placed within 5mm for transient response. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty-Cycle Operation | Enables regulation with VIN as low as VOUT + 300mV at 500mA, critical for Li-ion battery discharge tail-end support. |
| Synchronous Rectification | Reduces conduction loss vs. external Schottky diode; improves efficiency by ~3–5% at medium-to-heavy loads. |
| Idle Mode™ (PFM) | Automatically engages below 100mA load, reducing IQ to 200µA typ and extending battery life in portable instruments. |
| Current-Mode PWM Control | Delivers superior line/load transient response (<10µs recovery) and inherent cycle-by-cycle overcurrent protection. |
| Low-Noise Fixed-Frequency PWM | 300kHz switching avoids audible noise and simplifies EMI filtering in sensitive communications receivers. |
| Integrated VL Regulator | On-chip 3.3V LDO eliminates need for external logic supply; improves system BOM count and layout simplicity. |
Applications
| Portable Instruments | Cellular Radios |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes powered by single-cell Li-ion batteries (3.0V–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 3.3V for microcontroller, ADC, and display drivers. Use Value: 100% duty-cycle operation maintains regulation down to 3.3V input, extending usable battery capacity by >15% versus non-dropout converters. |
Use Scenario: UHF transceivers in public safety radios requiring low-noise power for IF stages and PLLs. IC Role / Device Role / Timing Role: Clean 3.3V supply for RF front-end ICs; SYNC input synchronized to system clock to avoid heterodyne interference. Use Value: Fixed 300kHz PWM and external SYNC capability eliminate switching harmonics near critical 21.4MHz or 455kHz IF frequencies. |
| Personal Communicators | Distributed Power Systems |
Use Scenario: Wearable voice recorders and Bluetooth headsets with tight space constraints and thermal limits. IC Role / Device Role / Timing Role: Compact, thermally efficient 1.8V/2.8V generation from shared 3.7V battery rail. Use Value: SO-8 package with internal MOSFET and synchronous rectifier reduces total solution size by eliminating external FET and diode. |
Use Scenario: Industrial sensor nodes using 5V or 12V backplane supplies to power mixed-signal subsystems. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 5V/12V to 1.25V–5V for FPGA I/O banks or analog front-ends. Use Value: Adjustable output and wide input range simplify BOM across multiple board variants sharing common power architecture. |
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, 2.05V–6.5V input; no 100% duty-cycle; 2.5µA shutdown current. | Lacks dropout capability below 2.5V input; better suited for higher-VIN, space-constrained apps where 3MHz allows smaller inductors. | Select when board area is critical and input never falls below 2.5V; avoid if supporting Li-ion discharge to 3.0V or lower. |
| LT1931ES5#TRMPBF | 1.2MHz, 1.3A, 3.6V–36V input; external MOSFET drive; no integrated synchronous rectifier; 10µA shutdown. | Higher voltage range and current, but requires external power stage; less efficient at light loads due to lack of PFM mode. | Choose for wide-input industrial rails (>12V); not suitable as drop-in replacement due to different topology and pinout. |
Compared with TPS62231DRVR and LT1931ES5#TRMPBF, the MAX887HESA+T uniquely combines 100% duty-cycle operation, integrated synchronous rectification, and Idle Mode™ PFM-making it optimal for battery-powered systems requiring extended runtime and deep-discharge support without sacrificing noise performance.
Availability
MAX887HESA+T is available at Aetrix Electronics and suitable for portable instruments, cellular radios, and distributed power systems requiring stable component supply across industrial temperature ranges and long-lifecycle production.
Supply support for MAX887HESA+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, medical, and communications applications.
The MAX887 product line delivers high-efficiency, low-noise step-down conversion for battery-powered and RF-sensitive systems-emphasizing dropout performance, mode flexibility, and integrated power-stage simplicity.
FAQ
What is the guaranteed operating temperature range for the MAX887HESA+T?
The MAX887HESA+T is specified for -40°C to +85°C ambient operation, validated across electrical parameters including output voltage accuracy, switching frequency, and current limit. This industrial-grade rating ensures reliable performance in portable test equipment and outdoor radio units where thermal extremes occur.
Does the MAX887HESA+T support true 100% duty-cycle operation, and under what conditions?
Yes-the MAX887HESA+T supports 100% duty-cycle operation when input voltage approaches the output voltage, enabled by its fOSC/4 maximum on-time architecture. Dropout voltage is typically 300mV at 500mA, determined by the 0.6Ω internal MOSFET RON and inductor DCR. This behavior is guaranteed for VOUT ≥ 3V and applies across the full -40°C to +85°C range.
How does the SYNC pin affect efficiency and noise performance in the MAX887HESA+T?
When SYNC is tied to VL, the MAX887HESA+T operates in forced PWM mode at 300kHz-ensuring constant frequency for predictable EMI filtering and minimal output ripple. When SYNC is grounded, it enters Idle Mode™ (PFM), reducing quiescent current to 200µA typ at light loads but increasing output ripple. This trade-off allows optimization for either noise-sensitive RF sections or battery longevity.
What external components are mandatory for stable operation of the MAX887HESA+T?
Mandatory components include: a 0.33µF ceramic capacitor on V+, a 2.2µF capacitor on VL, a 0.047µF capacitor on REF, and a resistor divider on FB (R2 = 5kΩ–100kΩ, R1 calculated per VOUT = 1.25V × (1 + R1/R2)). An external Schottky diode (1A) and 33µH inductor are also required-per Figure 2 in the MAX887HESA+T datasheet.
Can the MAX887HESA+T be used without an external diode when operating in PWM mode?
No-the MAX887HESA+T requires an external Schottky diode (D1) regardless of operating mode. While it includes an internal N-channel synchronous rectifier active during PWM, that rectifier is disabled in PFM mode and during light-load transitions. The external diode ensures continuous current path and prevents reverse current flow, maintaining regulation and protecting the output capacitor.
MAX887HESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX887HESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX887HESA+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 MAX887HESA+T reliable?
The price and inventory of MAX887HESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX887HESA+T is usually 5 days.
3.What payment methods are accepted for MAX887HESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX887HESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX887HESA+T?
MAX887HESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX887HESA+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 MAX887HESA+T?
For technical support, including MAX887HESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX887HESA+T requirements.
6.How does Aetrix verify that MAX887HESA+T is sourced from the original manufacturer or authorized distributors?
All MAX887HESA+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 MAX887HESA+T meets industry standards.
7.What is the process for return or replacement of MAX887HESA+T?
All MAX887HESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX887HESA+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 MAX887HESA+T part is unused and in its original packaging.
Return procedure for MAX887HESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX887HESA+T 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…
