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Analog Devices Inc./Maxim Integrated MAX1556ETB+T
- Part No.:
- MAX1556ETB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX1556ETB+T.pdf
- Description:
- IC REG BUCK ADJ 1.2A 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,309
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Product details
Overview
The MAX1556ETB+T from Maxim Integrated is a 16µA quiescent current, 1.2A synchronous step-down DC-DC converter in a 10-pin TDFN (3mm × 3mm) package, delivering pin-selectable 1.8V/2.5V/3.3V or adjustable output from 2.6V–5.5V input-optimized for Li-ion and multi-cell alkaline/NiMH battery-powered portable electronics including smartphones and digital cameras.
For engineers reviewing the MAX1556ETB+T datasheet, MAX1556ETB+T pinout, MAX1556ETB+T application, or MAX1556ETB+T equivalent, key selection criteria include guaranteed 1.2A output current, 1MHz PWM switching frequency, voltage positioning for load-transient response, 27µA dropout quiescent current, and soft-start capacitor control for inrush mitigation.
Technical Context
The MAX1556ETB+T employs a fixed-frequency (1MHz), current-mode PWM control architecture with internal slope compensation and dual MOSFETs (p-channel high-side, n-channel low-side) enabling synchronous rectification. Its proprietary topology maintains high efficiency across light-to-full loads via automatic pulse-skipping mode below ~10mA.
Voltage positioning is implemented via a defined load-regulation slope (−2.25% at 1.2A, typ), minimizing transient undershoot/overshoot without external compensation. Dropout operation at 100% duty cycle uses the p-channel MOSFET's 0.27Ω (typ) RDS(ON) to sustain regulation down to VIN ≈ VOUT + IOUT×(RDS(ON)P + DCRL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.2A guaranteed-supports CPU cores and baseband processors in handheld devices without thermal derating at TA ≤ +85°C. |
| Input Voltage Range | 2.6V to 5.5V-covers full discharge curve of single-cell Li-ion (4.2V → 2.7V) and 3-cell alkaline/NiMH (4.5V → 3.0V). |
| Quiescent Current | 16µA typical-enables >1-year shelf life in always-on portable instrumentation with coin-cell backup. |
| Switching Frequency | 1MHz ±10%-permits use of compact 3.3µH inductors and ceramic capacitors, reducing board area by >40% vs. 500kHz designs. |
| Output Accuracy | ±1.75% at 300mA, ±2.75% at 1.2A (TA = 0°C to +85°C)-ensures stable core voltage for 1.8V/2.5V/3.3V logic domains under varying load and temperature. |
| Dropout Quiescent Current | 27µA typical-extends usable battery capacity by minimizing current draw when VIN falls within 100mV of VOUT. |
| Shutdown Current | 0.1µA-enables true zero-power sleep states in battery-backed real-time clocks and sensors. |
Pinout & Package
MAX1556ETB+T is housed in a thermally enhanced 10-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed paddle for PCB-level heat sinking. Pin 1 is IN; pin 10 is D1; EP must be soldered to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Low-current input supply | Bypassed with 0.47µF capacitor; feeds bias circuitry and level-shifted logic-separate from high-current INP path. |
| 2 GND | Analog ground reference | Star-connected to PGND at output capacitor; critical for error amplifier stability and soft-start accuracy. |
| 3 SS | Soft-start timing node | Connects to GND via 1000pF capacitor; controls exponential VOUT ramp time (~3ms) to limit inrush into 22µF output capacitance. |
| 4 OUT | Feedback sense input | Monitors regulated output; internal resistor divider remains active in shutdown-enables seamless wake-up without output glitch. |
| 5 SHDN | Active-low enable control | Drives low to enter 0.1µA shutdown; pulled high internally when floating-no external pull-up required. |
| 6 D2 | Output voltage select bit | Logic level sets second bit of 2-bit VOUT code per Table 1; determines 1.8V/2.5V/3.3V/adjustable configuration. |
| 7 PGND | Power ground return | High-current return path for LX switch and output capacitor; must be low-inductance connection to minimize EMI and ripple. |
| 8 LX | Switch node | Connects to inductor; swings between GND and VIN; requires short, wide trace to reduce ringing and EMI radiation. |
| 9 INP | High-current input supply | Bypassed with 10µF ceramic capacitor directly to PGND; carries pulsed input current-decouples switching noise from system rails. |
| 10 D1 | Output voltage select bit | Logic level sets first bit of 2-bit VOUT code; combined with D2, selects preset output or enables adjustable mode (D1=D2=0). |
Key Features
| Feature | Design Value |
|---|---|
| Voltage positioning load line | −2.25% output shift at 1.2A ensures zero transient droop during CPU burst loads-eliminates need for large bulk capacitance. |
| Synchronous rectification | Integrated p-channel (0.27Ω) and n-channel (0.27Ω) MOSFETs eliminate external Schottky diode-reduces BOM count and improves efficiency by 5–8% at 500mA. |
| 1MHz current-mode PWM | Fixed-frequency operation with internal compensation enables stable regulation with only 22µF output capacitance-no external loop compensation required. |
| Pulse-skipping light-load mode | Reduces quiescent current to 16µA while maintaining regulation-extends battery runtime in standby modes of PDAs and smartwatches. |
| Adjustable soft-start | SS pin allows programmable startup ramp via external capacitor-prevents input source collapse during cold start from high-impedance alkaline cells. |
Applications
| Smartphone Application | Digital Camera Application |
|---|---|
Use Scenario: Powering application processor core (1.2A @ 1.2V) and memory interface during video capture. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated core voltage with fast transient response to handle CPU DVFS transitions. Use Value: Voltage positioning eliminates 50–100mV undershoot during 0→1.2A load steps-prevents processor reset and ensures frame integrity in 1080p recording. | Use Scenario: Supplying image sensor analog front-end (1.8V @ 300mA) and digital signal processor (2.5V @ 600mA). IC Role / Device Role / Timing Role: Dual-output power stage (using two MAX1556ETB+T units) providing low-noise, low-ripple bias for pixel readout and ISP clock domains. Use Value: 16µA quiescent current extends standby time between shots; 1MHz switching avoids interference with sensor sampling clock harmonics. |
| Portable Medical Monitor | Handheld Test Instrument |
Use Scenario: Powering ECG analog signal chain (3.3V @ 150mA) and ARM Cortex-M4 MCU (1.8V @ 400mA) from AA batteries. IC Role / Device Role / Timing Role: High-efficiency step-down converter sustaining regulation as battery voltage drops from 4.5V to 3.0V during continuous 8-hour operation. Use Value: 27µA dropout quiescent current extracts final 15% of battery energy-enabling uninterrupted patient monitoring beyond typical cutoff points. | Use Scenario: Providing stable 2.5V reference rail (600mA) for precision ADC and DAC in battery-operated multimeter. IC Role / Device Role / Timing Role: Low-noise, high-PSRR DC-DC source replacing LDO to improve conversion efficiency from 3-cell alkaline input. Use Value: 97% peak efficiency at full load doubles battery life vs. linear regulator; soft-start prevents meter calibration drift during power-on. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz switching frequency, 0.8V–6V input, 600mA output, 22µA IQ-smaller inductor but lower current capability. | Targeted at ultra-compact space-constrained apps (wearables); not suitable for 1.2A loads. | Select when board area is primary constraint and peak load ≤600mA; verify thermal performance at 600mA in 2mm × 2mm DSBGA. |
| RT8059GJ6 | 1.5MHz, 2.5V–5.5V input, 1.2A output, 25µA IQ, integrated soft-start-lacks voltage positioning and has higher dropout IQ (45µA). | General-purpose portable power; no load-transient optimization for CPU-like loads. | Choose for cost-sensitive designs where ±3% output accuracy and basic efficiency suffice-avoid for high-dV/dt processor rails. |
Compared with TPS62231DRVR and RT8059GJ6, the MAX1556ETB+T uniquely combines 1.2A output, voltage positioning, and 27µA dropout current-making it the only option among the three that maintains regulation and minimal transient droop across the full battery discharge range of Li-ion and alkaline systems.
Availability
MAX1556ETB+T is available at Aetrix Electronics and suitable for smartphone power management, digital camera imaging subsystems, portable medical monitors, and handheld test instruments requiring stable component supply with full lifecycle support.
Supply support for MAX1556ETB+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 high-performance analog and mixed-signal ICs for power, sensing, and connectivity in battery-powered and industrial systems.
The MAX1556ETB+T belongs to Maxim's ultra-low-IQ DC-DC converter family, engineered specifically for extended battery life and tight transient response in portable consumer electronics with dynamic load profiles.
FAQ
What is the maximum output current capability of the MAX1556ETB+T?
The MAX1556ETB+T delivers a guaranteed 1.2A output current across the full operating temperature range (−40°C to +85°C). This rating is validated under worst-case conditions including 5.5V input, 3.3V output, and ambient temperature up to +85°C with proper PCB thermal design using the exposed paddle. The device maintains regulation without foldback or thermal shutdown at this current level.
How does the MAX1556ETB+T achieve low quiescent current in light-load conditions?
The MAX1556ETB+T achieves 16µA typical quiescent current by automatically entering pulse-skipping mode below ~10mA load. In this mode, the PWM comparator disables and switching occurs only as needed to maintain output regulation-reducing gate drive and bias currents while preserving feedback loop integrity. This behavior is intrinsic to the current-mode controller and requires no external configuration.
Can the MAX1556ETB+T operate in dropout mode, and what is its quiescent current in that state?
Yes, the MAX1556ETB+T operates in 100% duty-cycle dropout mode when input voltage approaches output voltage. In this state, the internal p-channel MOSFET remains fully on, and quiescent current rises only to 27µA typical-minimizing battery drain while sustaining regulation. This feature is critical for extracting maximum energy from aging alkaline or deeply discharged Li-ion cells.
What is the purpose of the SS (soft-start) pin on the MAX1556ETB+T, and how is it configured?
The SS pin on the MAX1556ETB+T controls the exponential ramp rate of the output voltage during startup to prevent input inrush current. It is configured by connecting an external capacitor (e.g., 1000pF) from SS to GND. The resulting soft-start time is approximately 3ms for a 22µF output capacitor, calculated as tSS = 600 × CSS (in pF) microseconds. No resistor is required-the internal 200kΩ pull-down sets the time constant.
Does the MAX1556ETB+T require external compensation components for stability?
No, the MAX1556ETB+T features internal compensation optimized for standard 22µF ceramic output capacitors and recommended inductors (e.g., 3.3µH). Its current-mode control architecture with fixed 1MHz frequency eliminates the need for external RC networks or type-II/type-III compensators-simplifying layout and reducing bill-of-materials cost while ensuring stability across all operating conditions.
MAX1556ETB+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:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.75V (1.8V, 2.5V, 3.3V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
MAX1556ETB+T FAQ
1.How can I place an order for MAX1556ETB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1556ETB+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 MAX1556ETB+T reliable?
The price and inventory of MAX1556ETB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1556ETB+T is usually 5 days.
3.What payment methods are accepted for MAX1556ETB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1556ETB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1556ETB+T?
MAX1556ETB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1556ETB+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 MAX1556ETB+T?
For technical support, including MAX1556ETB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1556ETB+T requirements.
6.How does Aetrix verify that MAX1556ETB+T is sourced from the original manufacturer or authorized distributors?
All MAX1556ETB+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 MAX1556ETB+T meets industry standards.
7.What is the process for return or replacement of MAX1556ETB+T?
All MAX1556ETB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1556ETB+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 MAX1556ETB+T part is unused and in its original packaging.
Return procedure for MAX1556ETB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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