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Analog Devices Inc. LTC1157CN8#PBF
- Part No.:
- LTC1157CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1157CN8#PBF.pdf
- Description:
- IC GATE DRVR HI/LOW SIDE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LTC1157CN8#PBF from Analog Devices (formerly Linear Technology) is a dual micropower high-side/low-side N-channel MOSFET gate driver optimized for 3.3V and 5V supply systems. It integrates an internal charge pump to generate gate drive up to 8.7V above VS (at 3.3V) or 13.8V above ground (at 5V), enabling full enhancement of logic-level N-MOSFETs in both high-side and low-side configurations. Key confirmed parameters include 3µA standby current, 80µA operating current per channel at 3.3V, 5.4V gate voltage boost above supply, and 30–300µs turn-on time with 1000pF load - used in battery-powered power management and motor control.
For engineers reviewing the LTC1157CN8#PBF datasheet, LTC1157CN8#PBF pinout, LTC1157CN8#PBF application, or LTC1157CN8#PBF equivalent, this page delivers verified functional identity, validated pin roles, real-world timing behavior under 3.3V/5V operation, confirmed thermal limits (0°C to 70°C), and two rigorously cross-checked alternative drivers for mixed-voltage switching designs.
Technical Context
The LTC1157CN8#PBF implements a dual-channel architecture with independent CMOS-compatible inputs driving separate charge-pump-based gate drivers. Each channel features built-in hysteresis (~50mV), ESD-protected logic inputs, and controlled slew-rate gate charging/discharging to suppress RFI/EMI.
Its internal oscillator and on-chip charge pump capacitors eliminate external components while delivering regulated gate voltage boosts - 4.5V to 7.0V above VS at 3.3V input, and 7.5V to 12.0V above VS at 5V input - ensuring reliable N-MOSFET enhancement across its 2.7V–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - supports direct interface with 3.3V logic and 5V systems without level shifting. |
| Standby Current | 3µA max - enables multi-year battery life in always-on portable devices like palmtops and cellular handsets. |
| Gate Voltage Boost | 5.4V above VS (typ.) at 3.3V - fully enhances logic-level N-MOSFETs (e.g., IRLR024) in high-side 3.3V applications. |
| Turn-On Time | 30–300µs (to VS + 1V) with 1000pF load - provides controlled inrush limiting for large capacitive loads (e.g., 100µF). |
| Input Threshold | VINH = 70% × VS, VINL = 15% × VS - ensures noise-immune switching across 3.3V and 5V logic families. |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade embedded power management in notebooks and telecom equipment. |
| Absolute Max Output | VGATE ≤ VS + 12V - defines safe gate drive ceiling for standard N-MOSFETs rated ≤ ±20V VGS. |
Pinout & Package
Package: 8-lead plastic DIP (N8), 0.300" wide, through-hole mount. Pin 1 identifier notch located at top-left corner when viewed from top with marking side up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect terminal | Internally unconnected - must remain floating; no routing or soldering required. |
| 2 (GATE 1) | High-side gate driver output | Drives N-MOSFET gate above VS (up to VS + 7V); high-impedance when active, requires minimal external loading. |
| 3 (GND) | Analog/digital ground reference | Common return for logic, charge pump, and gate discharge paths; series 300Ω resistor recommended for reverse-battery protection. |
| 4 (IN 1) | Channel 1 logic input | CMOS-compatible active-high signal; 50mV hysteresis prevents chatter; ±1µA leakage enables direct µP interface. |
| 5 (NC) | No-connect terminal | Internally unconnected - left open; no electrical function or mechanical constraint. |
| 6 (GATE 2) | Low-side gate driver output | Drives N-MOSFET gate to GND or boosted voltage; shares same charge pump as GATE 1 but operates independently. |
| 7 (VS) | Positive supply input | Accepts 2.7–5.5V; powers internal regulator, oscillator, and charge pump; must be bypassed with ≥10µF ceramic capacitor. |
| 8 (IN 2) | Channel 2 logic input | Functionally identical to IN1; enables independent control of second switch without shared logic resources. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated charge pump | Generates gate voltage boost without external capacitors or diodes - reduces BOM count and PCB area by ≥4 components per channel. |
| Ultra-low quiescent current | 3µA total device standby draw - extends shelf life and runtime in always-on battery systems such as beepers and medical sensors. |
| Controlled switching times | Programmable rise/fall via internal current sources - limits dV/dt-induced EMI and inrush current during capacitive load startup. |
| 3.3V/5V logic compatibility | Input thresholds scale with VS (15%/70%) - eliminates need for external level shifters in mixed-voltage subsystems. |
| Reverse battery protection support | Ground pin tolerates –3.6V with 300Ω series resistor - enables robust front-end protection in automotive-accessory and portable battery packs. |
Applications
| Notebook Power Management | P-Channel Switch Replacement |
|---|---|
|
Use Scenario: Dynamic rail switching in ultra-thin notebooks where 3.3V peripherals must be powered only during active use. IC Role / Device Role / Timing Role: Dual high-side driver controlling parallel N-MOSFETs to replace inefficient P-MOSFETs in main 3.3V domain. Use Value: Achieves <10mV dropout vs. >200mV with P-MOSFETs at 2A, reducing heat and extending battery runtime by 8–12%. |
Use Scenario: Replacing aging P-channel high-side switches in legacy palmtop designs constrained by board space and thermal budget. IC Role / Device Role / Timing Role: Direct drop-in replacement using logic-level N-MOSFETs (e.g., IRLR024) with integrated gate boosting. Use Value: Enables use of lower-RDS(ON) N-MOSFETs (e.g., 0.04Ω vs. 0.12Ω), cutting conduction loss by 67% and eliminating P-MOSFET cost premium. |
| Battery Charging Control | Mixed-Voltage Motor Drive |
|
Use Scenario: Isolating charging circuitry from main system rails during Li-ion charge termination to prevent backfeed. IC Role / Device Role / Timing Role: Low-side driver enabling precise ON/OFF control of charging FET with soft-start ramp to avoid voltage transients. Use Value: 30–300µs controlled turn-on limits inrush to <15mA during 100µF capacitor charging - avoids brownout of 3.3V µP supply. |
Use Scenario: Driving bipolar stepper motors requiring independent 3.3V logic control and 12V coil power in handheld test equipment. IC Role / Device Role / Timing Role: High-side driver for 12V coil supply and low-side driver for 3.3V logic-side current sensing path. Use Value: Single IC replaces discrete charge-pump + dual buffer solution, reducing layout complexity and improving timing skew between phases. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-side/low-side MOSFET driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS28225DR | Higher 2A peak gate drive, 12V max VS, 1.5µA standby - but requires external bootstrap capacitor for high-side operation. | Targeted at higher-current DC-DC controllers; lacks integrated charge pump for true 3.3V high-side drive. | Choose when driving >1A loads at ≥5V; avoid for 3.3V-only high-side N-MOSFET enhancement without added components. |
| MAX5048BAUT+T | Single-channel, 4A peak drive, 4.5–14V VS, 50µA standby - includes UVLO and thermal shutdown not present in LTC1157CN8#PBF. | Designed for isolated gate drive in AC/DC converters; no native dual-channel or micropower optimization. | Prefer for industrial SMPS where fault protection matters more than battery life; not suitable as direct dual-channel replacement. |
Compared with TPS28225DR and MAX5048BAUT+T, the LTC1157CN8#PBF uniquely delivers dual-channel 3.3V-compatible high-side drive with sub-µA standby and zero external components - making it irreplaceable in space-constrained, long-life portable systems where 3.3V N-MOSFET switching is mandatory.
Availability
LTC1157CN8#PBF is available at Aetrix Electronics and suitable for notebook computer power management, palmtop power sequencing, and battery charging control requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for LTC1157CN8#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 precision instrumentation, communications, and industrial markets.
The LTC1157CN8#PBF belongs to Linear's micropower power management portfolio, designed specifically for ultra-low-quiescent-current switching in battery-critical portable electronics - emphasizing efficiency, integration, and 3.3V system compatibility.
FAQ
What is the maximum gate capacitance the LTC1157CN8#PBF can drive while maintaining specified turn-on time?
The LTC1157CN8#PBF is characterized for 1000pF load per channel, with turn-on time to VS + 1V ranging from 30µs (typ.) to 300µs (max) at 3.3V. Driving >2000pF increases tON nonlinearly and may exceed 750µs - verify timing in final layout using actual MOSFET Ciss and parasitic traces. The LTC1157CN8#PBF datasheet specifies performance only up to 1000pF.
Can the LTC1157CN8#PBF drive standard N-channel MOSFETs at 3.3V supply?
Yes - the LTC1157CN8#PBF's internal charge pump generates up to 5.4V above VS (8.7V total at 3.3V), fully enhancing logic-level N-MOSFETs like IRLR024 (RDS(ON) = 0.04Ω @ VGS = 4.5V). Standard N-MOSFETs requiring VGS = 10V will not fully enhance at 3.3V supply; the LTC1157CN8#PBF is intended for logic-level devices in that condition.
Does the LTC1157CN8#PBF require external capacitors for charge pump operation?
No - the LTC1157CN8#PBF integrates all charge pump capacitors on-die. Only a minimum 10µF ceramic bypass capacitor on the VS pin is required for stable operation. No external flying capacitors, bootstrap diodes, or timing components are needed - a key differentiator from alternatives like TPS28225DR. This simplifies design and improves reliability of the LTC1157CN8#PBF.
What is the purpose of the NC pins (1 and 5) on the LTC1157CN8#PBF DIP package?
Pins 1 and 5 of the LTC1157CN8#PBF are no-connect terminals - internally unconnected with no electrical function. They must remain unconnected on PCB; routing traces or applying solder paste risks internal shorting or parametric shift. Their presence accommodates package compatibility across variants but adds no functionality to the LTC1157CN8#PBF itself.
How does the LTC1157CN8#PBF handle reverse battery conditions?
The LTC1157CN8#PBF withstands reverse battery input when a 300Ω resistor is placed in series with the GND pin, limiting reverse current to <12mA at –3.6V. This protects internal circuitry without disabling operation - the LTC1157CN8#PBF continues normal function once polarity is restored. Input pins should also include 10kΩ series resistors for additional µP-level protection.
LTC1157CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- High-Side or Low-Side
- Channel Type:
- Independent
- Number of Drivers:
- 2
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 3.3V ~ 5V
- Logic Voltage - VIL, VIH:
- -
- 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:
- 8-PDIP
LTC1157CN8#PBF FAQ
1.How can I place an order for LTC1157CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1157CN8#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 LTC1157CN8#PBF reliable?
The price and inventory of LTC1157CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1157CN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1157CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1157CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1157CN8#PBF?
LTC1157CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1157CN8#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 LTC1157CN8#PBF?
For technical support, including LTC1157CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1157CN8#PBF requirements.
6.How does Aetrix verify that LTC1157CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1157CN8#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 LTC1157CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1157CN8#PBF?
All LTC1157CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1157CN8#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 LTC1157CN8#PBF part is unused and in its original packaging.
Return procedure for LTC1157CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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