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Analog Devices Inc./Maxim Integrated MAX1595ETC33+
- Part No.:
- MAX1595ETC33+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1595ETC33+.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,892
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Product details
Overview
MAX1595ETC33+ from Maxim Integrated is a regulated 3.3V step-up/step-down charge-pump DC-DC converter supporting 1.8V–5.5V input, delivering up to 75mA output current with ±3% regulation accuracy, 1MHz fixed-frequency switching, and 220µA quiescent current. It serves as a compact auxiliary supply in battery-powered miniature equipment requiring efficient local voltage conversion without inductors.
For engineers reviewing the MAX1595ETC33+ datasheet, MAX1595ETC33+ pinout, MAX1595ETC33+ application, or MAX1595ETC33+ equivalent, key selection criteria include its buck-boost capability across wide input range, ceramic-capacitor-only design (3×), load disconnect in shutdown, and thermal performance enabled by the exposed-pad 12-pin TQFN package.
Technical Context
The MAX1595ETC33+ implements a dual-mode switched-capacitor architecture: in boost mode, it charges CX from VIN and transfers charge to COUT to generate 3.3V; in buck mode (VIN > 3.3V + diode drop), S1 remains connected to IN while S2 alternates between IN and OUT, regulating by controlling charge transfer proportional to (VIN – VOUT). This enables seamless transition between modes without external control.
Its internal 1.23V bandgap reference feeds an error amplifier comparing AOUT (sensed at COUT) against feedback, driving a 1MHz oscillator that controls high-current MOSFET switches. Undervoltage lockout (1.6V threshold with 40mV hysteresis) and soft-start (≤2ms) ensure robust power sequencing and stability under varying input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% - ensures stable bias for 3.3V logic, flash memory, or white LED strings without external resistive feedback. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion (3.0–4.2V), two-cell NiMH (2.4–3.0V), or 3.3V/5V system rails as source. |
| Max Output Current | 75mA at 3.3V - sufficient for powering small microcontrollers, SIM cards, or PCMCIA peripherals with tight thermal margin in TQFN. |
| Switching Frequency | 1.0MHz (±15%) - enables use of 0.22µF ceramic CX and 1µF COUT, minimizing board area and EMI compared to lower-frequency pumps. |
| Quiescent Current | 220µA - extends battery life in always-on backup or low-duty-cycle sensing applications. |
| Shutdown Current | 0.1µA - fully isolates output from input during deep sleep, preventing leakage through load. |
| Thermal Resistance θJA | 41°C/W (TQFN-EP) - allows ≥1950mW dissipation at +70°C ambient, supporting higher continuous loads than µMAX variant. |
Pinout & Package
MAX1595ETC33+ uses a 12-pin TQFN-EP (3mm × 3mm, 0.5mm pitch) with exposed pad thermally connected to GND. The EP must be soldered to a large PCB ground plane for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AOUT (Pin 1) | Analog power/sense input to error amplifier | Must connect directly to COUT's output node - provides accurate remote sensing and stabilizes regulation under load transients. |
| SHDN (Pin 2) | Digital enable/disable control | Active-high logic: drives device into 0.1µA shutdown with output disconnect; requires ≥1.6V to activate, ≤0.6V to disable. |
| IN (Pins 3,4) | Main power input | Dual pins reduce IR drop and improve current handling; bypass with 1µF ceramic capacitor close to pins for noise suppression. |
| GND (Pin 5) | Analog ground reference | Separate from PGND to minimize noise coupling into error amplifier; connects internally to EP. |
| PGND (Pins 6,7) | Power ground return path | Low-impedance return for switch currents; must tie to GND only at single point near EP to avoid ground bounce. |
| CXN (Pins 8,9) | Negative terminal of charge-transfer capacitor | Connects to negative side of 0.22µF CX; routing must be short and symmetric with CXP to minimize loop inductance. |
| CXP (Pin 10) | Positive terminal of charge-transfer capacitor | Connects to positive side of CX; forms critical high-frequency switching node - keep trace short and away from sensitive analog nodes. |
| OUT (Pins 11,12) | Regulated output | Dual pins support higher current delivery and lower impedance; bypass with 1µF ceramic capacitor placed adjacent to pins. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components, reducing EMI, board area, and BOM cost - ideal for ultra-thin portable devices. |
| Load disconnect in shutdown | Prevents backfeed from output to input rail, protecting upstream sources and enabling safe hot-swap operation. |
| Buck-boost regulation | Maintains 3.3V output whether input is below (e.g., 2.4V) or above (e.g., 4.5V) target - removes need for separate LDO or boost IC. |
| Exposed thermal pad (EP) | Enables 1951mW max power dissipation at +70°C - supports higher sustained loads than 8-pin µMAX variant. |
| Ultra-low shutdown current | 0.1µA draw preserves battery capacity over months in storage or standby, critical for IoT edge sensors. |
Applications
| White LED Backlighting | Flash Memory Supply |
|---|---|
Use Scenario: Powering 1–3串联 white LEDs in handheld medical displays or barcode scanners powered by single Li-ion cells. IC Role / Device Role / Timing Role: Regulated 3.3V charge pump supplying constant current driver ICs or direct LED bias where forward voltage exceeds battery voltage. Use Value: Enables consistent brightness across full battery discharge (2.8V–4.2V), eliminating flicker and extending runtime via 1MHz ceramic-capacitor efficiency. | Use Scenario: Providing clean 3.3V supply to NAND/NOR flash in embedded data loggers or industrial controllers during write/erase cycles. IC Role / Device Role / Timing Role: Auxiliary voltage source decoupled from noisy main system rail, ensuring stable VCC during high-current flash operations. Use Value: Prevents data corruption by maintaining ≥3.16V output even at 75mA load and 1.8V input - validated across -40°C to +85°C. |
| PCMCIA Card Power | GSM SIM Card Boost |
Use Scenario: Generating 3.3V from 5V host slot for legacy PCMCIA Wi-Fi or modem cards requiring isolated auxiliary power. IC Role / Device Role / Timing Role: Step-down charge pump replacing inefficient linear regulators, activated only when card is inserted and powered. Use Value: Reduces heat generation vs. LDO solution and eliminates need for external inductor - fits within strict PCMCIA height constraints. | Use Scenario: Boosting 3V SIM card interface voltage to 3.3V in dual-voltage GSM handsets operating from 3V battery. IC Role / Device Role / Timing Role: Local voltage translator ensuring SIM compliance with 3.3V I/O spec while drawing minimal quiescent current between transactions. Use Value: Achieves 3.33V typical output at 30mA load with 1.8V–3.0V input range - meets ETSI TS 102 221 requirements without layout-sensitive inductors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge-pump regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17222ELB33+ (3.3V) | Inductor-based synchronous boost; 500mA output; 0.7µA IQ; requires external inductor and diode. | Better suited for higher-current (>100mA), lower-noise applications where inductor size is acceptable. | Select MAX17222ELB33+ if output current >75mA is required and board space allows inductor placement. |
| TPS60403DBVR | 3.3V charge pump; 60mA output; 1.2MHz; no exposed pad; SOIC-8 package; 250µA IQ. | Limited thermal headroom and lower current rating - suitable only for low-power, non-continuous duty cycles. | Select TPS60403DBVR only for cost-sensitive, low-density designs where 60mA peak load suffices and TQFN assembly is unavailable. |
Compared with MAX1595ETC33+, MAX17222ELB33+ delivers 6.7× more current but adds inductor cost and EMI risk, while TPS60403DBVR offers simpler assembly yet sacrifices 20% output current and thermal robustness - MAX1595ETC33+ uniquely balances 75mA capability, ceramic-only design, and TQFN thermal performance.
Availability
MAX1595ETC33+ is available at Aetrix Electronics and suitable for white LED backlighting, flash memory supplies, and PCMCIA card power applications requiring stable component supply, RoHS-compliant packaging, and extended temperature operation (-40°C to +85°C).
Supply support for MAX1595ETC33+ 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, mixed-signal, and power management ICs for industrial, communications, and consumer markets.
The MAX1595 product line delivers compact, inductorless DC-DC conversion for space-constrained portable and battery-powered systems where efficiency, low quiescent current, and wide input range are critical.
FAQ
What is the maximum continuous output current for MAX1595ETC33+ at 3.3V?
The MAX1595ETC33+ delivers up to 75mA continuous output current while maintaining ±3% regulation across -40°C to +85°C. This value is specified in the Electrical Characteristics table under "Output Voltage" test conditions (0 < ILOAD < 75mA, VIN = +2.0V) and reflects thermal limits of the 12-pin TQFN-EP package with its 41°C/W θJA.
Does MAX1595ETC33+ require an inductor in its application circuit?
No, MAX1595ETC33+ is a capacitor-based charge-pump regulator and requires no inductor. Its complete application circuit uses only three external ceramic capacitors: 1µF CIN, 0.22µF CX, and 1µF COUT. This eliminates magnetic components, reduces EMI, and saves board space - a defining feature confirmed in the General Description and Applications sections of the datasheet.
How does the shutdown function work on MAX1595ETC33+?
Driving SHDN (Pin 2) low disables MAX1595ETC33+, reducing supply current to 0.1µA and disconnecting the output from the input. When SHDN rises above 1.6V, the device enters soft-start mode, ramping output over ≤2ms until regulation is achieved. This behavior is explicitly defined in the Shutdown section and verified in the Electrical Characteristics table (ISHDN = 5µA max, VINL = 0.6V max).
Can MAX1595ETC33+ operate with input voltages below 2.0V?
Yes, MAX1595ETC33+ operates down to 1.8V input, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. At 1.8V input, it maintains 3.3V output with ±3% accuracy up to 30mA load - confirmed by the "0 < ILOAD < 30mA, VIN = +1.8V" row in the VOUT specification table.
What is the purpose of the AOUT pin on MAX1595ETC33+?
The AOUT pin (Pin 1) is the analog power and sense input to the internal error amplifier. It must be connected directly to the output filter capacitor (COUT) node to provide accurate remote voltage sensing. This connection ensures stable regulation under dynamic load conditions and minimizes output deviation caused by PCB trace resistance - a requirement detailed in the Pin Description and Applications Information sections.
MAX1595ETC33+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 125mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TQFN (4x4)
MAX1595ETC33+ FAQ
1.How can I place an order for MAX1595ETC33+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1595ETC33+ 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 MAX1595ETC33+ reliable?
The price and inventory of MAX1595ETC33+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1595ETC33+ is usually 5 days.
3.What payment methods are accepted for MAX1595ETC33+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1595ETC33+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1595ETC33+?
MAX1595ETC33+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1595ETC33+ 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 MAX1595ETC33+?
For technical support, including MAX1595ETC33+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1595ETC33+ requirements.
6.How does Aetrix verify that MAX1595ETC33+ is sourced from the original manufacturer or authorized distributors?
All MAX1595ETC33+ 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 MAX1595ETC33+ meets industry standards.
7.What is the process for return or replacement of MAX1595ETC33+?
All MAX1595ETC33+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1595ETC33+, 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 MAX1595ETC33+ part is unused and in its original packaging.
Return procedure for MAX1595ETC33+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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