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Renesas ISL97656IRTZ-T
- Part No.:
- ISL97656IRTZ-T
- Manufacturer:
- Renesas
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
ISL97656IRTZ-T.pdf
- Description:
- IC REG BOOST ADJ 3.8A 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,710
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Product details
Overview
ISL97656IRTZ-T from Intersil is a non-synchronous current-mode step-up DC/DC regulator with an integrated 4.0A/120mΩ low-side MOSFET, 640kHz or 1.22MHz selectable switching frequency, 2.2V–6.0V input range, and 1.1×VIN to 24V output range-designed for TFT-LCD bias supplies in portable displays.
For engineers reviewing the ISL97656IRTZ-T datasheet, ISL97656IRTZ-T pinout, ISL97656IRTZ-T application, or ISL97656IRTZ-T equivalent, key selection criteria include peak current limit (4.0A), feedback reference voltage (1.24V), shutdown current (<1µA), soft-start control via external capacitor, and TDFN-10 package thermal performance (θJC = 3°C/W).
Technical Context
The ISL97656IRTZ-T uses constant-frequency PWM current-mode control with internal slope compensation, enabling stable operation across wide duty cycles (up to 92% at 640kHz). Its transconductance error amplifier (70–250µA/V) interfaces with an external RC compensation network on the COMP pin to tune loop stability and transient response.
Switching frequency is selected by the FREQ pin (GND = 640kHz, VIN = 1.22MHz), directly affecting inductor size and load-step response speed. The device implements cycle-by-cycle peak current limiting, thermal shutdown at 150°C, and input UVLO with 50mV hysteresis (2.10V rising threshold), ensuring robust operation under brownout and overload conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 6.0V - supports single-cell Li-ion (2.7–4.2V) and dual-cell alkaline/NiMH (2.4–3.2V) inputs without pre-regulation. |
| Output Voltage Range | 1.1×VIN to 24V - enables adjustable TFT-LCD gate driver (VGH/VGL) and LED backlight bias generation. |
| Switch Current Limit | 3.8A to 5.1A (min/typ/max) - sets maximum deliverable output current based on input/output ratio and efficiency. |
| Feedback Reference | 1.22V to 1.26V - defines precision of output regulation; used with resistor divider to set VOUT = 1.24V × (1 + R1/R2). |
| Shutdown Current | 0.1µA to 5µA - ensures ultra-low power-off leakage for battery-powered systems requiring >1-year shelf life. |
| Switching Frequency | 640kHz or 1.22MHz - selects trade-off between inductor size (smaller at 1.22MHz) and EMI profile (lower fundamental at 640kHz). |
| rDS(ON) | 120mΩ (typ) at VIN = 2.7V - determines conduction loss and thermal rise under full-load conditions. |
Pinout & Package
ISL97656IRTZ-T is housed in a 10-lead Thin Dual Flat No-lead (TDFN) package (3mm × 3mm, 0.8mm max height) with exposed thermal pad for enhanced heat dissipation (θJC = 3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (COMP) | Error amplifier output | Connects external RC network to set loop gain crossover and phase margin for stable regulation under dynamic loads. |
| 2 (FB) | Voltage feedback input | Senses divided output voltage; internal 1.24V reference enables precise output setting with <0.5µA bias current. |
| 3 (EN) | Enable control | Logic-level input (VIH ≥ 1.5V); pulls high to activate converter, low to enter <1µA shutdown mode. |
| 4,5 (GND) | Power ground | Common return path for switch current and analog circuitry; must be connected to thermal pad for optimal θJA. |
| 6,7 (LX) | Switch node | Drain connection of internal 4A MOSFET; routes high di/dt switching current to external inductor and Schottky diode. |
| 8 (VIN) | Input supply | Accepts 2.2–6.0V; requires local 0.1µF ceramic bypass capacitor to suppress high-frequency noise. |
| 9 (FREQ) | Frequency select | Logic-controlled pin: GND → 640kHz, VIN → 1.22MHz; no pull-up/down required. |
| 10 (SS) | Soft-start control | Internal 4.5µA current source charges external capacitor to ramp output voltage and limit inrush current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4.0A low-side MOSFET | rDS(ON) = 120mΩ enables >90% efficiency at 1A output while eliminating external switch layout complexity. |
| Selectable 640kHz / 1.22MHz switching | Allows optimization of magnetic size (e.g., 10µH at 640kHz vs. 4.7µH at 1.22MHz) and transient response bandwidth. |
| External compensation (COMP pin) | Enables tuning of loop dynamics for diverse output capacitors (ceramic, tantalum) and load profiles without redesign. |
| Adjustable soft-start (SS pin) | Controls output slew rate via external capacitor value, preventing inrush-induced input droop or display flicker. |
| Thermal protection & UVLO | Shuts down at 150°C junction temperature and disables below 2.10V input, protecting against overtemperature and battery depletion. |
Applications
| TFT-LCD Display Bias Supply | Digital Camera Backlight Driver |
|---|---|
|
Use Scenario: Generating VGH (18–22V) and VGL (–8 to –12V) for active-matrix LCD panels in handheld tablets and e-readers. IC Role / Device Role / Timing Role: Primary boost controller delivering regulated high-voltage rails from single-cell Li-ion battery. Use Value: High 4A current capability supports fast panel charging; 1.22MHz option minimizes inductor footprint in space-constrained bezels. |
Use Scenario: Driving white LED strings (3–5 LEDs in series) in compact digital cameras and camcorders. IC Role / Device Role / Timing Role: Constant-current-capable boost regulator with analog dimming interface via FB pin modulation. Use Value: 1.24V feedback reference enables precise current-setting with minimal resistor tolerance impact; <1µA shutdown extends standby time. |
| DSL Modem Power Management | PCMCIA Card Voltage Booster |
|
Use Scenario: Providing isolated 12V rail for line-driver ICs and PHY transceivers in broadband DSL modems. IC Role / Device Role / Timing Role: Secondary high-efficiency boost stage following primary buck converter, reducing overall thermal load. Use Value: 640kHz/1.22MHz flexibility allows EMI compliance in noisy telecom environments; TDFN-10 package simplifies thermal management on dense PCBs. |
Use Scenario: Elevating 3.3V host bus voltage to 5V or 12V for legacy PCMCIA peripherals (e.g., CompactFlash, wireless adapters). IC Role / Device Role / Timing Role: Standalone voltage booster activated only when card is inserted and enabled via EN pin. Use Value: Ultra-low shutdown current (<1µA) prevents battery drain during card removal; 2.2V minimum input supports operation down to depleted battery states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Synchronous rectification, 5.5A switch, fixed 500kHz/1.1MHz (no pin-selectable frequency), higher quiescent current (15µA active). | Better efficiency at light loads due to synchronous architecture; lacks external compensation pin for loop tuning. | Preferred where >95% efficiency at 10–100mA is critical; not suitable when custom loop response or ceramic capacitor compatibility is required. |
| MAX17062ETA+ | Non-synchronous, 3.5A switch, fixed 1.2MHz, integrated Schottky diode, no FREQ or COMP pins. | Smaller BOM count (integrated diode), but limited to 1.2MHz and no soft-start adjustment; lower max output voltage (18V). | Best for cost-sensitive, fixed-frequency designs with moderate output voltage requirements and no need for transient optimization. |
Compared with TPS61088RHLR and MAX17062ETA+, the ISL97656IRTZ-T offers unique flexibility in frequency selection, external loop compensation, and soft-start control-making it optimal for TFT-LCD and portable display applications demanding tight regulation, small magnetics, and configurable startup behavior.
Availability
ISL97656IRTZ-T is available at Aetrix Electronics and suitable for TFT-LCD display bias supplies, digital camera LED drivers, and DSL modem power subsystems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL97656IRTZ-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
Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management IC designer known for high-performance DC/DC converters, precision amplifiers, and timing solutions.
The ISL97656IRTZ-T belongs to Intersil's high-efficiency boost regulator product line, engineered specifically for portable display power applications requiring compact size, low quiescent current, and flexible frequency/compensation configuration.
FAQ
What is the maximum output voltage supported by the ISL97656IRTZ-T?
The ISL97656IRTZ-T supports an output voltage range from 1.1×VIN up to 24V. This is achieved using an external resistor divider on the FB pin referenced to the internal 1.24V bandgap. For outputs above 24V, a cascaded external MOSFET topology (per Figure 16 in the datasheet) is required, as the internal switch is rated for 26V LX-to-GND maximum.
How does the FREQ pin affect switching frequency and design trade-offs in the ISL97656IRTZ-T?
The FREQ pin on the ISL97656IRTZ-T selects between two fixed frequencies: grounding the pin sets 640kHz, while connecting it to VIN selects 1.22MHz. At 1.22MHz, smaller inductors (e.g., 4.7µH vs. 10µH) reduce board area and improve transient response, but increase switching losses and EMI filtering complexity. At 640kHz, efficiency improves at medium-to-heavy loads and EMI is easier to manage.
Can the ISL97656IRTZ-T operate from a single 2.5V alkaline cell?
Yes-the ISL97656IRTZ-T operates down to 2.2V input, making it compatible with a single fresh alkaline cell (1.5V nominal, up to 1.65V) in series with a low-dropout pre-regulator, or more directly with two alkaline cells (2.4–3.2V range). Its 2.10V UVLO threshold with 50mV hysteresis ensures reliable start-up and graceful shutdown as the battery discharges.
What is the role of the COMP pin in the ISL97656IRTZ-T, and how is it configured?
The COMP pin on the ISL97656IRTZ-T is the output of the internal transconductance error amplifier and serves as the loop compensation node. It is connected to ground via a series RC network: the resistor (0–2kΩ) sets high-frequency gain for transient response, and the capacitor (3–10nF) introduces an integrator zero for phase margin. This external network allows stabilization across varied output capacitor types (ceramic, tantalum) and load conditions without changing IC design.
Does the ISL97656IRTZ-T provide reverse-blocking capability when disabled?
No-the ISL97656IRTZ-T uses a non-synchronous boost topology with an external Schottky diode, creating a DC path from input to output even in shutdown. When EN is low, the output voltage drops to VIN minus the diode forward voltage (~0.4–0.6V), which may be unacceptable in some systems. To block this path, an additional PMOS or NMOS switch must be added between VIN and the inductor, controlled by the EN signal (see Figure 17 in the datasheet).
ISL97656IRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.2V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- 25V
- Current - Output:
- 3.8A (Switch)
- Frequency - Switching:
- 640kHz, 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN-EP (3x3)
ISL97656IRTZ-T FAQ
1.How can I place an order for ISL97656IRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL97656IRTZ-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 ISL97656IRTZ-T reliable?
The price and inventory of ISL97656IRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL97656IRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL97656IRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL97656IRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL97656IRTZ-T?
ISL97656IRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL97656IRTZ-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 ISL97656IRTZ-T?
For technical support, including ISL97656IRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL97656IRTZ-T requirements.
6.How does Aetrix verify that ISL97656IRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL97656IRTZ-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 ISL97656IRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL97656IRTZ-T?
All ISL97656IRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL97656IRTZ-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 ISL97656IRTZ-T part is unused and in its original packaging.
Return procedure for ISL97656IRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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