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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Supply Controllers, Monitors

Analog Devices Inc./Maxim Integrated MAX1964TEEE+

Name: MAX1964TEEE+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX1964TEEE+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX1964TEEE+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Power Supply Controllers, Monitors

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: MAX1964TEEE+.pdf

Description:: IC POWER CTRLR/SEQUENCER 16QSOP

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Product details

Overview

MAX1964TEEE+ from Maxim Integrated is a triple-output tracking/sequencing power-supply controller IC featuring a synchronous step-down DC-DC controller (preset 3.3V or adjustable 1.236V–0.75×VIN), two positive analog gain blocks for auxiliary linear regulators, and voltage sequencing capability. It operates from 4.5V to 28V input, delivers up to 95% efficiency at 200kHz, and eliminates current-sense resistors via MOSFET R_DS(ON)-based sensing - used in cable modem CPE and set-top box power systems.

For engineers reviewing the MAX1964TEEE+ datasheet, MAX1964TEEE+ pinout, MAX1964TEEE+ application, or MAX1964TEEE+ equivalent, key selection considerations include its 16-pin QSOP package, integrated 5V VL regulator, dual-mode FB feedback (preset/adjustable), valley-current limiting with ILIM pin control, and sequencing behavior during startup across three regulated outputs.

Technical Context

The MAX1964TEEE+ implements a current-mode PWM control architecture with slope compensation to ensure stability and fast transient response. Its main controller regulates a high-current output using internal transconductance amplification at COMP and valley-current limiting derived from low-side MOSFET R_DS(ON), avoiding external sense resistors.

Two independent positive analog gain blocks (FB2/B2 and FB3/B3) drive external PNP pass transistors to generate secondary rails - e.g., 1.8V or 2.5V from the main 3.3V output - with 1.24V feedback reference and ±22mV transconductance error over load range. Startup sequencing is hardware-defined via FB and FB2 rising thresholds (1.145V).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 28V - supports unregulated wall adapters and wide-input industrial supplies without pre-regulation.
Switching Frequency	200kHz (±40kHz) - enables use of low-cost aluminum-electrolytic output capacitors and standard power magnetics.
Main Output Voltage	Preset 3.34V (±0.03V) or adjustable 1.236V–0.75×VIN - selectable via FB-to-GND (preset) or external resistor divider (adjustable mode).
VL Regulator Output	5.00V ±2.5% @ 0.1–20mA - powers internal circuitry, DL driver, BST capacitor, and external bias; disables thermal shutdown if shorted to GND.
Current-Limit Threshold	250mV (default) or adjustable 106–530mV via ILIM pin - sets valley-current limit using low-side MOSFET R_DS(ON), enabling lossless overcurrent protection.
Power-Good Monitoring	POK open-drain output asserts low if any output deviates >10% from regulation - provides system-level fault signaling with 3% hysteresis on FB/FB2/FB3 trip points.
Operating Temperature	−40°C to +85°C - qualified for consumer premise equipment (CPE) environments including cable modems and set-top boxes.

Pinout & Package

MAX1964TEEE+ is housed in a 16-pin QSOP (Quarter-Size Outline Package) with 0.65mm pitch, thermally enhanced for power-conversion applications. Pin functions are validated per Maxim's official datasheet revision 0 (July 2001).

Pin/Terminal	Circuit Role	Design Meaning
1 - POK	Open-drain power-good indicator	Asserts low when any output exceeds ±10% regulation; requires pull-up to VL for logic-level interface.
2 - COMP	Control loop compensation node	Connects external RC network to GND to stabilize current-mode PWM feedback loop.
3 - OUT	Main output voltage sense input	High-impedance connection to internal resistive divider; used for output monitoring and regulation.
4 - FB	Dual-mode feedback input	Ground for preset 3.3V mode; connects to resistive divider for adjustable mode (1.236V reference).
5 - B2	PNP base-drive output (Regulator 2)	Open-drain DMOS driver for external PNP transistor; enables 1.8V/2.5V linear regulator from main output.
6 - FB2	Regulator 2 feedback input	1.24V reference point; connects to divider between auxiliary output and GND for precise voltage setting.
7 - B3	PNP base-drive output (Regulator 3)	Second open-drain driver for independent positive rail generation (e.g., 3.3V auxiliary).
8 - FB3	Regulator 3 feedback input	Matches FB2 function; allows independent adjustment of third positive output voltage.
9 - ILIM	Current-limit threshold control	Sets valley-current limit: tied to VL = 250mV default; resistive divider enables 106–530mV range.
10 - GND	Analog and power ground reference	Common return for all internal circuits; requires low-inductance layout for current-sense integrity.
11 - DL	Low-side gate-driver output	Swings between GND and VL; complements DH with controlled dead time to prevent shoot-through.
12 - LX	Inductor switch-node connection	Carries high di/dt switching current; used for R_DS(ON)-based current sensing and valley detection.
13 - DH	High-side gate-driver output	Swings between LX and BST; drives N-channel high-side MOSFET with bootstrap supply support.
14 - BST	Bootstrap capacitor connection	Connects external flying capacitor and diode to generate gate-drive voltage for DH output.
15 - VL	Internal 5V linear regulator output	Supplies internal logic, DL driver, BST circuitry; bypass with ≥1µF ceramic capacitor to GND.
16 - IN	Main input supply connection	Accepts 4.5–28V unregulated DC; requires local ≥1µF ceramic bypass capacitor near pin.

Key Features

Feature	Design Value
No external current-sense resistor	Uses low-side MOSFET R_DS(ON) as current-sensing element - reduces BOM cost and PCB area while maintaining accuracy.
Voltage sequencing at startup	Hardware-defined timing: FB rising → main output; FB2 rising → Regulator 2; FB3 rising → Regulator 3 - ensures safe power-up order in multi-rail systems.
Dual-mode FB input	Single pin supports both preset (3.3V) and adjustable (1.236V reference) operation - simplifies design reuse across voltage variants.
Integrated 5V VL regulator	Delivers 50mA at 5.00V ±2.5%; powers internal circuitry and external bootstrap components - eliminates need for separate bias supply.
Valley-current limiting	Monitors inductor current at cycle start using low-side FET conduction drop - provides robust, lossless overcurrent protection without added losses.
Forced-PWM operation	Maintains constant 200kHz switching frequency under all load conditions - minimizes cross-regulation in transformer-coupled auxiliary rails.

Applications

Cable Modem Power System	Set-Top Box Multi-Rail Supply
Use Scenario: Provides primary 3.3V, secondary 1.8V, and tertiary 2.5V rails from single 12V unregulated input in DOCSIS-compliant cable modem CPE. IC Role / Device Role / Timing Role: Main DC-DC controller (3.3V), two analog gain blocks (1.8V/2.5V), and sequencing supervisor during cold-start. Use Value: Eliminates three discrete regulators and current-sense resistors; achieves >90% system efficiency at full load with minimal external components.	Use Scenario: Generates 3.3V core, 1.8V memory, and 2.5V I/O rails in digital broadcast receivers with strict startup timing requirements. IC Role / Device Role / Timing Role: Triple-output power manager with hardware-enforced voltage sequencing to meet ASIC power-up specifications. Use Value: Reduces component count by 40% vs. discrete buck + LDO solution; POK signal enables firmware-controlled system reset on rail fault.
xDSL Customer Premise Equipment	Wireless Local Loop Base Station
Use Scenario: Powers ADSL2+ line card with 3.3V DSP core, 1.8V PHY interface, and 2.5V analog front-end from 24V telecom input. IC Role / Device Role / Timing Role: High-voltage input controller with coupled-winding support for 5V/12V auxiliary generation and sequencing coordination. Use Value: Enables direct 24V-to-3.3V conversion with 95% peak efficiency; FB2/FB3 allow independent trimming of downstream rails for margin testing.	Use Scenario: Supplies 3.3V processor, 1.8V RF transceiver, and 2.5V ADC/DAC in outdoor wireless access point operating at −40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade triple-output controller with extended temperature qualification and thermal shutdown (160°C). Use Value: Single-chip solution meets MIL-STD-810G environmental requirements; VL regulator ensures stable gate drive across temperature extremes.

Cable Modem Power System

Set-Top Box Multi-Rail Supply

Use Scenario: Provides primary 3.3V, secondary 1.8V, and tertiary 2.5V rails from single 12V unregulated input in DOCSIS-compliant cable modem CPE.

IC Role / Device Role / Timing Role: Main DC-DC controller (3.3V), two analog gain blocks (1.8V/2.5V), and sequencing supervisor during cold-start.

Use Value: Eliminates three discrete regulators and current-sense resistors; achieves >90% system efficiency at full load with minimal external components.

Use Scenario: Generates 3.3V core, 1.8V memory, and 2.5V I/O rails in digital broadcast receivers with strict startup timing requirements.

IC Role / Device Role / Timing Role: Triple-output power manager with hardware-enforced voltage sequencing to meet ASIC power-up specifications.

Use Value: Reduces component count by 40% vs. discrete buck + LDO solution; POK signal enables firmware-controlled system reset on rail fault.

xDSL Customer Premise Equipment

Wireless Local Loop Base Station

Use Scenario: Powers ADSL2+ line card with 3.3V DSP core, 1.8V PHY interface, and 2.5V analog front-end from 24V telecom input.

IC Role / Device Role / Timing Role: High-voltage input controller with coupled-winding support for 5V/12V auxiliary generation and sequencing coordination.

Use Value: Enables direct 24V-to-3.3V conversion with 95% peak efficiency; FB2/FB3 allow independent trimming of downstream rails for margin testing.

Use Scenario: Supplies 3.3V processor, 1.8V RF transceiver, and 2.5V ADC/DAC in outdoor wireless access point operating at −40°C to +85°C.

IC Role / Device Role / Timing Role: Industrial-grade triple-output controller with extended temperature qualification and thermal shutdown (160°C).

Use Value: Single-chip solution meets MIL-STD-810G environmental requirements; VL regulator ensures stable gate drive across temperature extremes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail power-supply controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX1965TEEP+	20-pin QSOP; adds fourth positive gain block (FB4/B4) and negative gain block (FB5/B5) for quintuple output capability.	Supports -5V/-12V generation and voltage tracking (not sequencing); requires additional external NPN for negative rail.	Select MAX1965TEEP+ only when fifth output (including negative) or tracking behavior is required; not pin-compatible with MAX1964TEEE+.
TPS54620RGYT	Single-output 6A synchronous buck controller (no auxiliary gain blocks); uses external current-sense resistor; 2.95–17V input.	Lacks integrated sequencing, multiple analog gain blocks, and VL regulator - requires companion LDOs for auxiliary rails.	Choose TPS54620RGYT for higher-current single-rail designs where auxiliary regulation is handled separately; no sequencing or multi-output integration.

Compared with MAX1965TEEP+, MAX1964TEEE+ offers simpler sequencing control and smaller footprint but lacks negative rail support; compared with TPS54620RGYT, it integrates auxiliary regulation and sequencing at the cost of lower per-rail current capability and fixed topology.

Availability

MAX1964TEEE+ is available at Aetrix Electronics and suitable for cable modem CPE, set-top box power systems, and xDSL customer premise equipment requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature operation.

Supply support for MAX1964TEEE+ 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) is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for power, interface, and sensing applications.

The MAX1964TEEE+ belongs to Maxim's Tracking/Sequencing Power-Supply Controller product line, designed specifically to reduce bill-of-materials and simplify multi-rail power architecture in cost-sensitive broadband communication equipment.

FAQ

What is the function of the ILIM pin on the MAX1964TEEE+?

The ILIM pin on the MAX1964TEEE+ sets the valley-current limit threshold for the main step-down controller. When tied to VL, it defaults to 250mV; connecting a resistive divider between VL and GND adjusts the threshold from 106mV to 530mV. This enables precise overcurrent protection calibrated to the low-side MOSFET's R_DS(ON), eliminating external sense resistors. The MAX1964TEEE+ uses this signal to disable high-side switching if inductor current exceeds the limit at cycle start.

Does the MAX1964TEEE+ support adjustable output voltage for all three regulated rails?

Yes - the MAX1964TEEE+ supports fully adjustable output voltages for all three rails. The main output is adjustable from 1.236V to 0.75×VIN via the FB pin and an external resistor divider. Regulator 2 (B2/FB2) and Regulator 3 (B3/FB3) each use dedicated 1.24V reference inputs, allowing independent adjustment of their respective outputs using standard resistive dividers referenced to GND. All three outputs are externally programmable without changing the MAX1964TEEE+ itself.

How does the MAX1964TEEE+ implement voltage sequencing during startup?

The MAX1964TEEE+ implements hardware-based voltage sequencing through sequential activation of its feedback comparators. At startup, the main output (FB) reaches regulation first; once FB rises above 1.145V, Regulator 2 (FB2) begins ramping; when FB2 crosses 1.145V, Regulator 3 (FB3) starts. This creates a deterministic, resistor-free sequencing order without external timers or controllers. The MAX1964TEEE+ does not require configuration registers or firmware - sequencing is intrinsic to its analog comparator thresholds.

Can the MAX1964TEEE+ generate negative output voltages?

No - the MAX1964TEEE+ cannot generate negative output voltages. It contains two positive analog gain blocks (B2/FB2 and B3/FB3) designed exclusively for driving external PNP transistors to produce additional positive rails. Negative voltage generation requires the MAX1965TEEP+, which includes a dedicated negative gain block (B5/FB5) and associated circuitry to drive an external NPN transistor with a coupled winding. Using MAX1964TEEE+ for negative rails would require external discrete circuitry not supported by its pinout or internal architecture.

What is the purpose of the VL pin on the MAX1964TEEE+ and how should it be decoupled?

The VL pin on the MAX1964TEEE+ is the output of an internal 5V linear regulator that powers internal logic, the DL low-side gate driver, and the BST bootstrap circuitry. It must be bypassed with a minimum 1µF ceramic capacitor connected directly to GND, placed as close as possible to the VL and GND pins. Failure to properly decouple VL may cause instability in gate drive, inaccurate current limiting, or thermal shutdown malfunction - especially since shorting VL to GND disables the thermal protection circuit entirely.

MAX1964TEEE+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 16-SSOP (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Programmable:: Not Verified

Applications:: Power Supply Controller, Sequencer

Voltage - Input:: 4.5V ~ 28V

Voltage - Supply:: -

Current - Supply:: 1.25 mA

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-QSOP

MAX1964TEEE+ FAQ

1.How can I place an order for MAX1964TEEE+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX1964TEEE+ 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 MAX1964TEEE+ reliable?

The price and inventory of MAX1964TEEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1964TEEE+ is usually 5 days.

3.What payment methods are accepted for MAX1964TEEE+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1964TEEE+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX1964TEEE+?

MAX1964TEEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX1964TEEE+ 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 MAX1964TEEE+?

For technical support, including MAX1964TEEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1964TEEE+ requirements.

6.How does Aetrix verify that MAX1964TEEE+ is sourced from the original manufacturer or authorized distributors?

All MAX1964TEEE+ 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 MAX1964TEEE+ meets industry standards.

7.What is the process for return or replacement of MAX1964TEEE+?

All MAX1964TEEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1964TEEE+, 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 MAX1964TEEE+ part is unused and in its original packaging.

Return procedure for MAX1964TEEE+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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