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Analog Devices Inc. LTC1156CN#PBF
- Part No.:
- LTC1156CN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1156CN#PBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,765
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Product details
Overview
LTC1156CN#PBF from Analog Devices (formerly Linear Technology) is a quad high-side micropower MOSFET driver with integrated charge pump, designed to fully enhance N-channel power MOSFETs in high-side switching positions. It operates from 4.5V to 18V, draws only 16µA standby current and 95µA per channel ON current, and provides gate voltage up to VS + 25V at 12V supply - enabling efficient low-RDS(on) FET use in battery-powered laptop power management.
For engineers reviewing the LTC1156CN#PBF datasheet, LTC1156CN#PBF pinout, LTC1156CN#PBF application, or LTC1156CN#PBF equivalent, key selection criteria include its internal charge pump eliminating external capacitors, independent over-current sensing per channel with programmable delay, TTL/CMOS-compatible inputs, and dual GND/VS pin configuration for accurate current-sense referencing.
Technical Context
The LTC1156CN#PBF integrates four independent high-side drivers, each with adaptive charge pump circuitry generating gate voltage above VS without external components. Its analog section includes a 100mV precision reference comparator for drain-sense over-current detection and an RC-programmable delay to suppress false triggering on in-rush loads.
Digital control logic features TTL-to-CMOS conversion with 1.3V threshold and ~100mV hysteresis, low-quiescent-current bias regulation, and fast/slow gate charge control. The device uses separate regulated supplies for analog and digital blocks to isolate charge-pump noise from the 100mV reference and comparator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5V to 18V - supports wide-input battery systems including 4-cell NiCd (6V) and 12V industrial rails. |
| Standby Quiescent Current | 16µA (typ) - enables multi-week battery standby in portable computing and peripheral power switches. |
| ON Quiescent Current | 95µA per channel (VS = 5V) - maintains micropower efficiency during active load control. |
| Drain Sense Threshold | 100mV (typ) - allows precise current limiting with low-value sense resistors (e.g., 0.03Ω for 3.3A max). |
| Gate Voltage Above VS | 7.0V (typ, VS = 5V); 18V (typ, VS = 12V) - ensures full enhancement of standard N-channel MOSFETs with VGS(th) ≤ 4V. |
| Turn-ON Time | 200µs (typ, VS = 5V, CGATE = 1000pF, VGATE > VS + 5V) - balances speed and EMI control in low-frequency switching. |
| Short-Circuit Turn-OFF Time | 16µs (typ, VS = 12V) - provides rapid fault shutdown to protect MOSFETs and loads during hard shorts. |
Pinout & Package
The LTC1156CN#PBF is housed in a 16-lead plastic DIP package (N package), with 0°C to 70°C operating temperature range. Both VS pins (3 and 8) must be connected together, and both GND pins (1 and 6) must be tied to system ground for accurate current sensing and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,6) | Ground Reference | Common return for analog/digital sections; both pins must be shorted externally to minimize ground bounce and ensure accurate 100mV sense threshold. |
| VS (3,8) | Power Supply Input | Main high-side rail input; both pins connect to top of sense resistor to maintain Kelvin sensing path integrity. |
| IN1–IN4 (2,4,5,7) | Logic Inputs | TTL/CMOS-compatible with 1.3V threshold and 100mV hysteresis; enable independent channel control without level-shifting. |
| G1–G4 (9,11,14,16) | Gate Drive Outputs | Charge-pump-boosted outputs driving N-MOSFET gates; capable of sourcing >50mA peak for fast turn-on. |
| DS1–DS4 (10,12,13,15) | Drain Sense Inputs | High-impedance comparator inputs monitoring voltage drop across external sense resistors; referenced to internal 100mV bandgap. |
Key Features
| Feature | Design Value |
|---|---|
| No external charge pump components | On-chip adaptive charge pump eliminates need for flying capacitors or diodes - reduces BOM count and PCB area in space-constrained laptops. |
| Independent per-channel over-current protection | Four dedicated 100mV-comparator inputs with RC-programmable delay allow tailored short-circuit response per load (e.g., delay for HDD spin-up, immediate trip for display short). |
| Controlled switching timing | Adjustable turn-on/off times via external gate capacitance enable EMI optimization and in-rush current limiting without added gate resistors. |
| Wide supply range with micropower operation | 4.5V–18V operation and 16µA standby support direct integration into 5V, 12V, and multi-cell battery systems while preserving battery life. |
| Replacement for P-channel high-side switches | Enables use of lower-cost, lower-RDS(on) N-channel MOSFETs instead of inefficient P-channel devices - reducing conduction loss by >50% at 2A. |
Applications
| Laptop Computer Power Switching | SCSI Termination Power Switching |
|---|---|
Use Scenario: Selectively powering floppy disk drive, hard disk drive, and display peripherals in portable computers during sleep/wake cycles. IC Role / Device Role / Timing Role: Quad high-side gate driver controlling four independent N-MOSFETs to isolate power domains while maintaining zero-load standby current. Use Value: 16µA total standby current extends battery life between charges; internal charge pump avoids external components that would increase board area and cost. | Use Scenario: Enabling/disabling SCSI bus termination voltage (TERMPWR) based on device presence detection in server backplanes. IC Role / Device Role / Timing Role: High-side switch driver providing clean, sequenced 5V TERMPWR to SCSI connectors with over-current fault shutdown. Use Value: Independent DSx inputs allow per-connector current monitoring; 100mV threshold supports accurate 1A–3A termination load protection. |
| Cellular Telephone Power Management | Low-Frequency H-Bridge Driver |
Use Scenario: Managing power to RF power amplifier modules, backlight LEDs, and audio codecs in GSM/CDMA handsets. IC Role / Device Role / Timing Role: Micropower high-side switch enabling rapid power cycling of subsystems during call setup, idle, and data transmission phases. Use Value: 95µA ON current per channel minimizes quiescent loss during active mode; 4.5V minimum supply supports single Li-ion cell operation with boost converter. | Use Scenario: Driving two legs of a low-frequency (<100Hz) H-bridge for stepper motor or DC motor control in industrial actuators. IC Role / Device Role / Timing Role: Dual high-side driver (with external low-side N-MOSFETs) providing shoot-through-free half-bridge control via complementary INx logic. Use Value: Controlled tON/tOFF prevents cross-conduction; independent DSx sensing protects each high-side leg against motor stall faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2051BDR | Single-channel, 500mA current-limited load switch; no internal charge pump; requires external pull-up for high-side N-MOSFET use. | Lacks quad integration and independent over-current sensing; suited for simple USB port power control, not multi-rail power sequencing. | Select when only one switched rail is needed and micropower standby is less critical than cost. |
| MAX14914ATP+ | Quad high-side switch with integrated 10-bit ADC, SPI interface, and diagnostics; 2.5mA quiescent current; no internal charge pump. | Designed for industrial PLC I/O modules requiring digital communication and health monitoring, not portable micropower systems. | Select when system-level diagnostics, configurability, and fault reporting outweigh ultra-low standby current requirements. |
Compared with TPS2051BDR and MAX14914ATP+, the LTC1156CN#PBF uniquely combines quad independent high-side drive, internal charge pump, 16µA standby, and analog current-sense flexibility - making it optimal for space- and power-constrained portable electronics where discrete component count and battery runtime are critical.
Availability
LTC1156CN#PBF is available at Aetrix Electronics and suitable for laptop computer power switching, SCSI termination control, and cellular telephone power management requiring stable component supply and long-term lifecycle support.
Supply support for LTC1156CN#PBF 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
Analog Devices (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and consumer markets.
The LTC1156CN#PBF belongs to Linear's legacy micropower high-side driver family, engineered specifically for battery-powered portable systems needing ultra-low standby current, integrated gate boosting, and robust per-channel fault protection.
FAQ
What is the maximum supply voltage rating for the LTC1156CN#PBF?
The LTC1156CN#PBF has an absolute maximum supply voltage of 22V, with recommended continuous operation from 4.5V to 18V. Exceeding 22V risks permanent damage to internal regulators and charge pump circuitry. At VS = 18V, the gate voltage can reach up to 25V above VS, enabling full enhancement of high-threshold N-MOSFETs used in industrial 24V systems.
Does the LTC1156CN#PBF require external components for charge pump operation?
No, the LTC1156CN#PBF integrates all charge pump capacitors and control circuitry on-die. Unlike discrete high-side drivers, it needs no external flying capacitors or diodes - simplifying layout, reducing BOM count, and improving reliability in compact designs such as laptop daughterboards and handheld peripherals.
How does the drain sense function work on the LTC1156CN#PBF?
The LTC1156CN#PBF uses four dedicated DSx pins (DS1–DS4) to monitor voltage drop across external sense resistors placed between the MOSFET source and ground. An internal 100mV precision reference is compared to this drop; if exceeded, the corresponding gate is discharged within 16µs (typ). An external RC network on the DSx line adds programmable delay to avoid tripping on capacitor in-rush currents.
What is the purpose of the dual VS and dual GND pins on the LTC1156CN#PBF?
The LTC1156CN#PBF features two VS pins (3 and 8) and two GND pins (1 and 6) to support Kelvin sensing of the current-sense resistor. Connecting both VS pins to the "top" of the sense resistor and both GND pins to the "bottom" ensures accurate 100mV threshold comparison by eliminating IR drop errors in PCB traces - critical for stable over-current protection across temperature and load variations.
Can the LTC1156CN#PBF drive logic-level N-channel MOSFETs directly from a 5V supply?
Yes, the LTC1156CN#PBF generates gate voltage up to VS + 7.0V (typ) at VS = 5V, delivering ~12V to the gate - sufficient to fully enhance logic-level N-MOSFETs with VGS(th) ≤ 2.5V and RDS(on) < 50mΩ. This eliminates the need for external level shifters or P-channel devices, improving efficiency and thermal performance in 5V portable systems.
LTC1156CN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- High-Side
- Channel Type:
- Independent
- Number of Drivers:
- 4
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 4.5V ~ 18V
- Logic Voltage - VIL, VIH:
- 0.8V, 2V
- Current - Peak Output (Source, Sink):
- -
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
LTC1156CN#PBF FAQ
1.How can I place an order for LTC1156CN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1156CN#PBF 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 LTC1156CN#PBF reliable?
The price and inventory of LTC1156CN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1156CN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1156CN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1156CN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1156CN#PBF?
LTC1156CN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1156CN#PBF 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 LTC1156CN#PBF?
For technical support, including LTC1156CN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1156CN#PBF requirements.
6.How does Aetrix verify that LTC1156CN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1156CN#PBF 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 LTC1156CN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1156CN#PBF?
All LTC1156CN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1156CN#PBF, 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 LTC1156CN#PBF part is unused and in its original packaging.
Return procedure for LTC1156CN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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