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Renesas ISL97536IUZ
- Part No.:
- ISL97536IUZ
- Manufacturer:
- Renesas
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL97536IUZ.pdf
- Description:
- IC REG BUCK ADJ 1A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,834
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Product details
Overview
ISL97536IUZ from Intersil is a synchronous 1A step-down DC/DC regulator with integrated PMOS/NMOS FETs, internal compensation, and 1.4MHz PWM switching. It operates from 2.5V–6V input (Li-ion, 3.3V, or 5V rails), delivers adjustable output from 0.8V to VIN via external resistor divider, and features 500µA quiescent current, <1µA shutdown current, and 100ms open-drain POR output - deployed in portable Li-ion-powered devices requiring compact, low-power regulation.
For engineers reviewing the ISL97536IUZ datasheet, ISL97536IUZ pinout, ISL97536IUZ application, or ISL97536IUZ equivalent, key selection criteria include its MSOP-10 footprint (<0.15in² PCB area), hiccup-mode overcurrent/over-temperature protection, internally compensated voltage-mode control, and compatibility with single-side assembly using only two 10µF ceramic capacitors and one 1.8µH inductor.
Technical Context
The ISL97536IUZ implements a fixed-frequency voltage-mode PWM controller with internal ramp generation and soft-start (650µs). Its synchronous rectification uses complementary PMOS (70mΩ) and NMOS (45mΩ) switches driven by integrated gate drivers, enabling up to 95% efficiency at 600mA with 3.3V input and 1.8V output.
Thermal protection triggers shutdown at +145°C (TOT,OFF) with 15°C hysteresis (TOT,ON = +130°C); the 10-lead MSOP package achieves θJA = 130°C/W on standard test board and supports full -40°C to +85°C ambient operation with Pb-free reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6V - supports direct connection to Li-ion battery (3.0–4.2V), 3.3V logic rail, or 5V supply without pre-regulation. |
| Output Current | 1A continuous - sufficient for core logic, RF modules, or display backlight drivers in portable systems. |
| Switching Frequency | 1.4MHz typical (1.25–1.6MHz) - enables use of small 1.5–2.2µH inductors and reduces output ripple without compromising EMI filtering complexity. |
| Quiescent Current | 500µA typical - minimizes standby power loss in always-on subsystems like real-time clocks or sensor interfaces. |
| Shutdown Current | <1µA - ensures negligible battery drain during deep sleep or system off states. |
| Feedback Voltage | 800mV ±10mV - sets precise output regulation point; allows accurate 0.8V–VIN adjustment using standard resistor tolerances. |
| Power-On Reset | 100ms delay (80–120ms) - provides reliable system-level reset timing for microcontrollers or FPGAs after power stabilization. |
Pinout & Package
ISL97536IUZ is housed in a 10-lead MSOP package (MDP0043), 3.0mm × 4.9mm × 1.1mm max height, RoHS-compliant with matte tin e3 termination. The fused-lead construction improves thermal resistance versus standard MSOP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SGND | Signal ground reference | Return path for controller-stage circuitry; must be separated from PGND and joined at single point near IC to avoid noise coupling. |
| 2 PGND | Power ground reference | Return path for high-current power stage (LX, VIN); requires large copper pour and multiple vias for thermal and EMI performance. |
| 3 LX | Switch node | Drives external inductor; carries high di/dt square wave - trace must be short and wide to minimize ringing and EMI. |
| 4 VIN | Main power input | Supplies power stage (PMOS/NMOS); requires local 10µF ceramic capacitor placed adjacent to PIN 4 and PIN 2. |
| 5 VDD | Controller supply | Provides bias to internal logic and reference; decoupled via 10µF capacitor to SGND; not interchangeable with VIN. |
| 6 RSI | Reset input | Active-HI signal that forces immediate POR low pulse; used for manual system reset without disrupting VO regulation. |
| 7 EN | Enable input | Logic-HI (>2.4V) enables regulation; logic-LOW (<0.8V) disables converter and reduces total current to <1µA. |
| 8 POR | Open-drain reset output | Asserts low for ~100ms after VO reaches target; requires external pull-up (R4) to function as Power-Good indicator. |
| 9 VO | Output voltage sense | Direct connection to regulated output node; used for remote sensing if layout permits; not for feedback division. |
| 10 FB | Voltage feedback input | Connects to resistor divider (R1/R2) between VO and SGND; 250nA input bias enables use of high-value resistors (e.g., 124kΩ/100kΩ). |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated controller | Eliminates need for external compensation network - simplifies design and guarantees stability with 10–40µF ceramic input/output caps and 1.5–2.2µH inductor. |
| Hiccup-mode overcurrent protection | Limits average power dissipation during sustained short-circuit by cycling shutdown/wait/restart (~700µs × VIN/3 + 216µs), preventing thermal runaway. |
| 100ms Power-On Reset (POR) | Provides deterministic, temperature-stable reset timing independent of external RC networks - reduces BOM count and layout sensitivity. |
| Single-side PCB assembly | Enables complete 1A converter implementation on top layer only - lowers manufacturing cost and eliminates via-in-pad or buried capacitance requirements. |
| Low-profile MSOP-10 package | 1.1mm max height meets strict Z-axis constraints in ultra-thin handhelds and SFP modules while supporting automated optical inspection. |
Applications
| Bar Code Readers | Cellular Phones |
|---|---|
|
Use Scenario: Compact handheld scanner requiring stable 1.8V rail for CMOS image sensor and decode ASIC under varying battery voltage (3.3–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1A at 1.8V with fast load transient response and hiccup-mode fault containment. Use Value: Enables single-cell Li-ion operation without intermediate LDO, reducing heat and extending runtime by >15% versus linear solutions. |
Use Scenario: Baseband processor core supply in dual-SIM smartphone where space and thermal budget constrain power delivery. IC Role / Device Role / Timing Role: Adjustable 1.2V–1.5V core regulator with POR synchronized to application processor boot sequence. Use Value: 500µA quiescent current extends standby time; MSOP-10 footprint fits within tight camera module keep-out zone. |
| PDA / Pocket PC Computers | SFP Modules |
|
Use Scenario: Main SoC I/O supply in legacy PDA with 3.3V rail derived from Li-ion battery and demand for low-noise, low-quiescent operation. IC Role / Device Role / Timing Role: Secondary buck converter generating clean 2.5V or 3.3V from main 5V rail, with EN controlled by system power manager. Use Value: Internal compensation avoids instability from aging electrolytic capacitors; <1µA shutdown current preserves battery during suspend-to-RAM. |
Use Scenario: Compact pluggable transceiver requiring isolated, low-EMI 3.3V supply for laser driver and limiting amplifier in 25Gbps data links. IC Role / Device Role / Timing Role: Point-of-load regulator mounted directly on SFP PCB with POR used as module-ready signal to host controller. Use Value: 1.4MHz switching avoids interference with 25GHz signal paths; 0.15in² footprint leaves room for high-density connector routing. |
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, 0.65V feedback reference, 2.05V–6.5V input range; smaller 6-pin WSON package but no POR output. | Lacks integrated POR and hiccup-mode protection; requires external reset IC for system sequencing. | Preferred when higher switching frequency enables smaller magnetics and lower output ripple is critical, but adds BOM and layout complexity for reset functionality. |
| RT8059NGSP | 2MHz switching, 0.6V feedback, 2.5V–5.5V input; includes enable and power-good but no RSI input or internal soft-start tuning. | Soft-start time fixed at 1ms (vs. 650µs); no programmable POR delay or hiccup recovery timing. | Selected for cost-sensitive designs where POR timing flexibility and hiccup-mode diagnostics are non-critical, and 2MHz operation suits tighter EMI bands. |
Compared with TPS62231DRVR and RT8059NGSP, the ISL97536IUZ uniquely integrates 100ms POR with RSI-triggered reset, hiccup-mode overcurrent recovery, and internal compensation optimized for 1.4MHz operation - making it optimal for space-constrained, battery-powered systems requiring robust, self-contained power sequencing without external support components.
Availability
ISL97536IUZ is available at Aetrix Electronics and suitable for bar code readers, cellular phones, PDAs, portable test equipment, and SFP modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ISL97536IUZ 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
Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management semiconductor designer known for high-efficiency DC/DC converters, precision references, and interface ICs targeting portable and industrial markets.
The ISL97536IUZ belongs to Intersil's monolithic synchronous buck regulator product line, engineered specifically for ultra-compact, low-quiescent-power applications in Li-ion–powered handheld electronics where minimal external components and guaranteed stability are mandatory.
FAQ
What is the maximum output current capability of the ISL97536IUZ?
The ISL97536IUZ delivers up to 1A continuous output current under specified thermal conditions. Its current limit is set at 1.5A (typical), triggering hiccup-mode protection if exceeded. Derating is required above +85°C ambient; full 1A operation is guaranteed across the full -40°C to +85°C temperature range with proper PCB copper area and thermal vias under the PGND pad. The ISL97536IUZ maintains regulation down to 0.8V output with external resistor divider.
Does the ISL97536IUZ require external compensation components?
No, the ISL97536IUZ features an internally compensated voltage-mode PWM controller. This eliminates the need for external compensation networks such as type-II or type-III error amplifier circuits. Stability is guaranteed when using 10–40µF ceramic input/output capacitors and a 1.5–2.2µH inductor - significantly simplifying layout and reducing BOM count compared to externally compensated regulators. The ISL97536IUZ achieves this with fixed internal ramp and error amplifier characteristics.
How does the RSI pin function on the ISL97536IUZ?
The RSI (Reset Input) pin on the ISL97536IUZ is an active-HI signal that forces the POR output low immediately upon assertion, then holds low for ~100ms after RSI returns to logic LOW. This provides a software- or hardware-controlled system reset independent of input voltage sequencing. The ISL97536IUZ output voltage remains unaffected during RSI assertion. When unused, RSI must be tied to ground; leaving it floating may cause erratic POR behavior.
What thermal performance can be expected from the ISL97536IUZ in its MSOP-10 package?
The ISL97536IUZ in the 10-lead MSOP package has a typical junction-to-ambient thermal resistance (θJA) of 130°C/W on a standard test board. With enhanced PCB layout - including ≥1cm² copper pour under the PGND pad and ≥4 thermal vias - θJA can improve to ~100°C/W. Thermal shutdown activates at +145°C (TOT,OFF) with 15°C hysteresis, ensuring safe recovery at +130°C (TOT,ON). The ISL97536IUZ operates reliably across -40°C to +85°C ambient.
Can the ISL97536IUZ be used with input voltages below 2.5V?
No, the absolute minimum input voltage for the ISL97536IUZ is 2.5V per its Absolute Maximum Ratings and Electrical Specifications. Operation below 2.5V risks failure to start, unstable regulation, or undefined behavior - particularly because the internal bandgap reference and gate drivers require sufficient headroom. The ISL97536IUZ is designed for 2.5V–6V inputs, covering single-cell Li-ion (3.0–4.2V), 3.3V, and 5V rails. For sub-2.5V applications, alternative regulators such as the ISL97671A should be evaluated.
ISL97536IUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 1A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
ISL97536IUZ FAQ
1.How can I place an order for ISL97536IUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL97536IUZ 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 ISL97536IUZ reliable?
The price and inventory of ISL97536IUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL97536IUZ is usually 5 days.
3.What payment methods are accepted for ISL97536IUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL97536IUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL97536IUZ?
ISL97536IUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL97536IUZ 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 ISL97536IUZ?
For technical support, including ISL97536IUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL97536IUZ requirements.
6.How does Aetrix verify that ISL97536IUZ is sourced from the original manufacturer or authorized distributors?
All ISL97536IUZ 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 ISL97536IUZ meets industry standards.
7.What is the process for return or replacement of ISL97536IUZ?
All ISL97536IUZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL97536IUZ, 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 ISL97536IUZ part is unused and in its original packaging.
Return procedure for ISL97536IUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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