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Analog Devices Inc./Maxim Integrated MAX1595EUA50
- Part No.:
- MAX1595EUA50
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1595EUA50.pdf
- Description:
- IC REG CHARG PUMP 5V 125MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:6,469
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Product details
Overview
MAX1595EUA50 from Maxim Integrated is a regulated 5.0V step-up/step-down charge-pump DC-DC converter designed for compact auxiliary power supplies. It accepts 1.8V–5.5V input, delivers up to 125mA output current with ±3% regulation, operates at 1MHz switching frequency, and requires only three ceramic capacitors-no inductor. It serves as a high-efficiency local supply in battery-powered miniature equipment and PCMCIA cards.
For engineers reviewing the MAX1595EUA50 datasheet, MAX1595EUA50 pinout, MAX1595EUA50 application, or MAX1595EUA50 equivalent, key selection considerations include its fixed 5.0V output, shutdown current of 0.1µA, load disconnect during shutdown, 1.6V undervoltage lockout threshold with 40mV hysteresis, and µMAX-8 package compatibility with space-constrained layouts.
Technical Context
The MAX1595EUA50 implements a dual-mode charge-pump architecture: it boosts input voltages below 5.0V and bucks inputs above ~5.7V (IN > VOUT + diode drop) using internal MOSFET switches S1 and S2. Regulation is maintained via an error amplifier comparing AOUT (sensed at COUT) against a 1.23V bandgap reference with internal resistive feedback.
Its 1MHz constant-frequency operation transitions smoothly to low-power mode under light loads. The control scheme minimizes output ripple-proportional to |VIN – VOUT| and CX/COUT ratio-and enables stable regulation across input variations from 1.8V to 5.5V while delivering up to 125mA at 5.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over -40°C to +85°C, 0–125mA load, ensuring stable rail for logic or analog circuitry without external 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. |
| Switching Frequency | 1.0MHz typical - enables use of 0.22µF ceramic transfer capacitor (CX) and 1µF output capacitor (COUT), minimizing board area. |
| Quiescent Current | 240µA typical at VIN = 3.0V - sustains low standby power in always-on subsystems without compromising startup speed. |
| Shutdown Current | 0.1µA - fully isolates output from input and eliminates leakage paths, critical for battery runtime in portable devices. |
| Undervoltage Lockout | 1.60V threshold with 40mV hysteresis - prevents erratic operation during brownout and ensures clean restart after battery recovery. |
| Output Current Capability | 125mA continuous - sufficient to power multiple white LEDs, flash memory VCC pins, or low-power microcontrollers in auxiliary domains. |
Pinout & Package
MAX1595EUA50 is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), RoHS-compliant with lead-free finish. The exposed pad is absent - this variant uses standard µMAX construction without thermal EP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AOUT | Analog power/sense node for error amplifier | Must connect directly to the output capacitor's positive terminal (COUT+) to ensure accurate regulation sensing and minimize noise coupling. |
| SHDN | Digital enable/disable control input | Active-high logic: drives >1.6V to enable, <0.6V to enter 0.1µA shutdown with output disconnect; requires no pull-up for default operation. |
| IN | Main power input | Accepts 1.8–5.5V; bypassed with 1µF ceramic capacitor close to pin to suppress switching noise and stabilize input impedance. |
| GND | Analog ground reference | Low-noise return for AOUT, SHDN, and internal bandgap; must be separated from PGND except at single-point star connection. |
| PGND | Power ground return | Carries high-frequency switch currents from CXN/CXP/OUT; connects to GND only at one point near IN bypass capacitor to avoid ground bounce. |
| CXN | Negative terminal of charge-transfer capacitor | Connects to 0.22µF ceramic capacitor (CX); forms half of flying-capacitor path; voltage swings between ~0V and VIN during operation. |
| CXP | Positive terminal of charge-transfer capacitor | Connects to same 0.22µF CX; voltage swings between VIN and ~VOUT during buck/boost cycles; layout symmetry with CXN is critical. |
| OUT | Regulated 5.0V output | Delivers up to 125mA; requires 1µF ceramic output capacitor (COUT) placed adjacent to pin to minimize ESR-induced ripple and transient droop. |
Key Features
| Feature | Design Value |
|---|---|
| No inductor required | Enables ultra-compact, low-EMI power solutions using only three ceramic capacitors - ideal for thin-profile handhelds and PCMCIA cards. |
| Load disconnect in shutdown | Prevents backfeed from OUT to IN during sleep mode, eliminating unintended biasing of upstream circuitry and extending battery life. |
| 1MHz fixed-frequency operation | Ensures predictable EMI profile and simplifies filtering; allows smaller CX and COUT values than lower-frequency pumps, reducing BOM cost and footprint. |
| ±3% output voltage accuracy | Guaranteed over full temperature and load range - eliminates need for post-regulation LDOs in noise-tolerant digital applications like SIM card supplies. |
| Ultra-low 0.1µA shutdown current | Reduces annual battery drain to <1µAh in always-connected backup systems - critical for long-life IoT sensors and real-time clock backups. |
Applications
| White LED Backlighting | Flash Memory VCC Supply |
|---|---|
|
Use Scenario: Powering 3–5 white LEDs in portable LCD displays where battery voltage drops from 4.2V to 3.0V during discharge. IC Role / Device Role / Timing Role: Regulated 5.0V charge-pump supply providing constant current drive to LED strings via external current regulators. Use Value: Maintains uniform brightness across battery discharge cycle without efficiency collapse - achieves >80% peak efficiency at 100mA even at VIN = 3.3V. |
Use Scenario: Providing stable 5.0V VCC to NAND/NOR flash memory in embedded storage modules operating from 3.3V system rails. IC Role / Device Role / Timing Role: Local step-up converter decoupled from main PMIC, ensuring clean, low-noise voltage during high-current write/erase pulses. Use Value: Eliminates voltage droop on shared 3.3V rail during 150mA flash programming bursts - ripple held to <35mV with 1µF COUT. |
| PCMCIA Card Auxiliary Power | 3V-to-5V SIM Card Interface |
|
Use Scenario: Generating 5.0V from 3.3V host interface for legacy PCMCIA peripherals requiring 5V I/O signaling. IC Role / Device Role / Timing Role: Compact, low-quiescent-current boost converter integrated into card-edge PCB with minimal external components. Use Value: Meets PCMCIA 2.0 specification for auxiliary 5V supply (100mA min) in <9mm × 7mm area - µMAX-8 fits within tight card height constraints. |
Use Scenario: Powering GSM SIM cards that require 5.0V operation from 3V battery sources in mobile handsets. IC Role / Device Role / Timing Role: Dedicated SIMM supply with fast line-transient response to handle dynamic current steps during RF transmission bursts. Use Value: Limits output deviation to <120mV during 50mA load steps (100µs/div), preventing SIM card reset or communication errors during call setup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge-pump regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1722EUA+ (3.3V/5.0V adj) | Adjustable output via external resistor divider; 1.2V to 5.5V input; 120mA max; 1.2MHz fSW; requires four capacitors. | Supports nonstandard output voltages (e.g., 4.5V) but adds BOM complexity and layout sensitivity due to feedback routing. | Choose when flexible VOUT is needed and board area permits extra resistor placement and noise-sensitive feedback trace routing. |
| TPS60403DBVR | Fixed 5.0V output; 1.6V–5.5V input; 60mA max; 1.6MHz fSW; 0.1µA shutdown; requires three capacitors. | Limited to 60mA load - insufficient for multi-LED or flash programming; better suited for low-power logic rails. | Choose only for sub-60mA 5V auxiliary rails where ultra-low shutdown current and higher fSW outweigh current limitations. |
Compared with MAX1595EUA50, MAX1722EUA+ offers output flexibility at the cost of precision and component count, while TPS60403DBVR trades 50% less output current for marginally lower quiescent current and higher switching frequency - neither matches MAX1595EUA50's 125mA capability in a µMAX-8 footprint.
Availability
MAX1595EUA50 is available at Aetrix Electronics and suitable for white LED backlighting, flash memory VCC generation, and PCMCIA card auxiliary power requiring stable component supply, consistent RoHS compliance, and long-term industrial availability.
Supply support for MAX1595EUA50 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 MAX1595 belongs to Maxim's charge-pump DC-DC regulator product line, engineered specifically for compact, inductorless auxiliary power in space-constrained portable electronics - prioritizing low component count, high efficiency across wide input ranges, and robust load transient performance.
FAQ
What is the output voltage tolerance of the MAX1595EUA50 over temperature and load?
The MAX1595EUA50 delivers a fixed 5.0V output with guaranteed ±3% regulation across the full operating range: -40°C to +85°C ambient temperature and 0–125mA load current. This specification is tested and guaranteed per the Electrical Characteristics table in the datasheet, with typical variation tighter (±1.5%) at +25°C and mid-load conditions. The MAX1595EUA50 achieves this stability using an internal 1.23V bandgap reference and precision resistive feedback network.
Can the MAX1595EUA50 operate with input voltage higher than its 5.0V output?
Yes, the MAX1595EUA50 supports buck operation when the input voltage exceeds approximately 5.7V (VOUT + diode drop). In this mode, internal switch S1 remains continuously connected to IN, while S2 alternates between IN and OUT to transfer charge proportional to the VIN–VOUT difference. However, the absolute maximum input rating is 6V, and sustained operation above 5.5V violates the recommended operating conditions - the MAX1595EUA50 is optimized for VIN = 1.8V–5.5V, including buck scenarios down to ~5.0V.
What is the purpose of the AOUT pin on the MAX1595EUA50, and how must it be connected?
The AOUT pin on the MAX1595EUA50 is the analog sense and power input for the internal error amplifier. It must be connected directly to the positive terminal of the output filter capacitor (COUT+), not to the OUT pin itself. This Kelvin connection ensures accurate regulation by sampling voltage at the load-relevant point, rejecting IR drops in the output trace. Incorrect routing - such as tying AOUT to OUT or placing it near noisy PGND - causes instability, overshoot, or poor load regulation in the MAX1595EUA50.
Does the MAX1595EUA50 require special layout considerations for the CX capacitor?
Yes, the MAX1595EUA50 demands symmetric, low-inductance placement of the 0.22µF charge-transfer capacitor (CX) between CXP and CXN. Both CX traces must be equal length, width, and proximity to minimize loop inductance and differential noise. The capacitor should be a X7R ceramic in 0603 size (e.g., Taiyo Yuden LMK107BJ224MA) placed directly adjacent to the IC. Asymmetry or long traces cause increased ripple, EMI, and potential oscillation - issues confirmed in MAX1595EUA50 evaluation reports and layout guidelines.
How does the MAX1595EUA50 handle load transients, and what is its typical response time?
The MAX1595EUA50 exhibits a typical load transient response of <100µs to settle within ±50mV of 5.0V when stepping from 5mA to 95mA (90mA ΔILoad), as shown in Figure 8 of the datasheet. This performance relies on the 1µF output capacitor and proper AOUT connection. The control architecture transitions smoothly between constant-frequency and pulse-skipping modes, maintaining regulation without significant undershoot or ringing - making the MAX1595EUA50 suitable for dynamic loads like flash memory programming or LED dimming bursts.
MAX1595EUA50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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):
- 5V
- 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:
- 8-µMAX
MAX1595EUA50 FAQ
1.How can I place an order for MAX1595EUA50 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1595EUA50 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 MAX1595EUA50 reliable?
The price and inventory of MAX1595EUA50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1595EUA50 is usually 5 days.
3.What payment methods are accepted for MAX1595EUA50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1595EUA50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1595EUA50?
MAX1595EUA50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1595EUA50 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 MAX1595EUA50?
For technical support, including MAX1595EUA50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1595EUA50 requirements.
6.How does Aetrix verify that MAX1595EUA50 is sourced from the original manufacturer or authorized distributors?
All MAX1595EUA50 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 MAX1595EUA50 meets industry standards.
7.What is the process for return or replacement of MAX1595EUA50?
All MAX1595EUA50 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1595EUA50, 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 MAX1595EUA50 part is unused and in its original packaging.
Return procedure for MAX1595EUA50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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