Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Diodes Incorporated PAM99700AC

Name: PAM99700AC
Brand: Diodes Incorporated
SKU: PAM99700AC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: PAM99700AC

Manufacturer:: Diodes Incorporated

Category:: LED Drivers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: PAM99700AC.pdf

Description:: IC LED DRIVER OFFL PWM 8SOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,450

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

PAM99700AC from Diodes Incorporated is an obsolete open-loop peak-current-mode LED driver IC for buck topology, supporting 12V–500V DC input, 250mV current-sense threshold, and dual dimming (PWM up to few kHz + linear 0–250mV). It operates in constant-frequency or constant-off-time mode and drives external N-channel MOSFETs for LED currents from a few mA to >1A.

For engineers reviewing the PAM99700AC datasheet, PAM99700AC pinout, PAM99700AC application, or PAM99700AC equivalent, key selection considerations include its wide-input-voltage regulator (12–500V), gate drive capability (0.2A sink/source), thermal shutdown (160°C), and SOP-8L package with validated 8-pin assignment.

Technical Context

The PAM99700AC implements open-loop peak-current control without loop compensation, using dual comparators (250mV internal reference and LD pin voltage) feeding an OR-gated SR flip-flop reset. Its blanking interval (250ns) suppresses turn-on spikes, and response time (~80ns) enables fast current regulation.

It supports two oscillator configurations: RT-to-GND for constant-frequency operation (e.g., 41kHz typ at 510kΩ), or RT-to-GATE for constant-off-time mode (e.g., ~44µs off-time at 510kΩ), enabling duty-cycle flexibility >0.5 without subharmonic oscillation.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	12V–500V DC - powers directly from high-voltage rails without auxiliary supply
Current Sense Threshold	250mV - sets LED current via external sense resistor (R_CS = 0.25V / 1.15×I_LED)
Oscillator Frequency	37–49kHz (RT=510kΩ) - determines switching period in constant-frequency mode
Gate Drive Current	0.2A sink/source - supports FETs with Q_G <25nC at ≤100kHz
Thermal Shutdown	160°C with 50°C hysteresis - disables output until junction cools to 110°C
PWM Dimming Bandwidth	Up to few kHz - enables flicker-free dimming with inductor-current-limited rise/fall times
Linear Dimming Range	0–250mV on LD pin - adjusts current-sense threshold for fine-tuned LED intensity control

Pinout & Package

SOP-8L package (JEDEC MS-012AC), 1.27mm pitch, body size 4.9×6.0mm, thermal resistance θ_JA = 115°C/W.

Pin/Terminal	Circuit Role	Design Meaning
VIN	High-voltage input rail	Supplies internal 12V regulator; accepts 12–500V DC directly
CS	Current-sense comparator input	Detects FET current via external R_CS; triggers GATE turn-off when ≥250mV or LD voltage
GND	Power and signal ground	Common return for internal circuitry and power train; must be low-inductance connection
GATE	N-channel MOSFET gate driver output	Drives external FET with 0.2A sink/source; rise/fall time ≤50ns (1nF load)
PWMD	PWM enable/disable control	Pull to GND disables GATE output; pull high enables normal operation
VDD	Internal circuit power supply	Bypassed with ≥10µF low-ESR capacitor; regulated 12V output from VIN
LD	Linear dimming reference input	Sets current-sense threshold (0–250mV); overrides internal 250mV reference
RT	Oscillator timing resistor node	RT-to-GND → constant frequency; RT-to-GATE → constant off-time mode

Key Features

Feature	Design Value
Open-loop peak-current control	Eliminates need for loop compensation, high-side sensing, or error amplifier - reduces BOM count and layout complexity
Dual dimming interface	Independent PWM (0–100% duty, few kHz) and linear (0–250mV) inputs - enables hybrid dimming strategies
Wide-input-voltage regulator	12–500V DC input range with integrated 12V VDD regulator - removes need for external bias supply
Configurable oscillator mode	Selectable constant-frequency or constant-off-time operation via single RT pin connection - balances EMI vs. input-voltage rejection
Fast comparator response	~80ns propagation delay with 250ns blanking - ensures accurate current limiting while rejecting turn-on transients

Applications

RGB Backlighting LED Driver

Flat Panel Display Backlight

Use Scenario: Driving red, green, and blue LED strings in LCD TV or monitor backlight units with independent dimming per channel.

IC Role / Device Role / Timing Role: Open-loop buck controller regulating each string's current via separate CS/RT/LD networks; PWM dimming synchronizes with display frame rate.

Use Value: Enables precise color balance and contrast control using only three external components per channel, reducing system cost and board area.

Use Scenario: Powering edge-lit or direct-lit LED arrays behind LCD panels in commercial signage or industrial HMIs.

IC Role / Device Role / Timing Role: Constant-current source operating from 24V–48V DC bus; constant-off-time mode maintains stable current across varying input voltage due to long cable runs.

Use Value: Delivers ±5% LED current accuracy without closed-loop feedback, minimizing brightness variation across large displays.

General Purpose Constant Current Source

Decorative LED Lighting

Use Scenario: Providing regulated current to high-brightness white LEDs in architectural or task lighting fixtures powered from 120VAC rectified rails.

IC Role / Device Role / Timing Role: Buck controller interfaced with bridge rectifier and bulk capacitor; LD pin used for 0–10V analog dimming interface.

Use Value: Supports 1A+ output with minimal external parts, enabling compact, thermally efficient drivers for retrofit lamps and downlights.

Use Scenario: Driving flexible LED strips or pixelated modules in retail displays, stage lighting, or façade installations.

IC Role / Device Role / Timing Role: High-voltage input (up to 500V DC) allows direct integration with PoE++ or HVDC distribution; PWMD enables synchronized strobing effects.

Use Value: Eliminates need for isolated DC-DC converters, reducing bill-of-materials and improving reliability in distributed lighting systems.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL9910A	Successor part with improved thermal performance (θ_JA = 90°C/W), lower startup current (0.05mA vs. 0.1mA), and extended V_IN range (10–550V)	Same buck topology support but adds overvoltage protection and enhanced ESD rating (4kV HBM)	Preferred for new designs requiring higher reliability and wider input tolerance
MPQ3367	Integrated high-side switch (no external FET required), fixed 1MHz frequency, I_OUT max = 1.2A	Targeted at low-power RGB LED drivers with integrated PWM generator; lacks linear dimming input	Consider for space-constrained designs where external FET elimination outweighs dimming flexibility

Compared with PAM99700AC, AL9910A offers superior thermal margin and input voltage headroom for legacy 500V systems, while MPQ3367 trades external component count for reduced dimming versatility - making AL9910A the direct functional replacement and MPQ3367 a topology-alternative for compact low-power applications.

Availability

PAM99700AC is available at Aetrix Electronics and suitable for RGB backlighting, flat panel display backlight, and decorative LED lighting applications requiring stable component supply despite its obsolete status.

Supply support for PAM99700AC 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and ICs, specializing in power management, signal integrity, and connectivity solutions for industrial, computing, and consumer markets.

The PAM99700AC belongs to Diodes' universal LED driver controller product line, designed specifically for cost-sensitive, high-voltage buck LED applications requiring minimal external components and dual-dimming capability.

FAQ

What is the maximum recommended input voltage for reliable operation of PAM99700AC?

The absolute maximum VIN rating is 500V DC, but practical maximum depends on thermal limits. With SOP-8L θ_JA = 115°C/W and 100°C allowable junction rise, sustained operation above ~435V requires external power dissipation mitigation (e.g., series Zener diode) to avoid exceeding 150°C T_JMAX.

Can PAM99700AC operate without an external MOSFET?

No. The PAM99700AC is a controller-only IC with dedicated GATE output driving an external N-channel MOSFET. It lacks integrated power switches and requires external inductor, sense resistor, and FET to form a functional buck LED driver.

How does constant-off-time mode improve input voltage rejection compared to constant-frequency mode?

In constant-off-time mode, the off-time remains fixed while on-time adjusts inversely with input voltage, causing duty cycle to self-compensate for VIN changes. This results in near-constant LED current across wide input ranges - unlike constant-frequency mode, where duty cycle must be actively adjusted to maintain regulation.

Why does LED current not reach zero when LD pin is grounded?

Grounding LD sets the current-sense threshold near 0mV, but the IC enforces a minimum on-time (~450ns) comprising blanking time plus output delay. This forces the FET to conduct briefly each cycle, sustaining residual current dependent on VIN, L, and V_F - true zero current requires PWMD = GND.

PAM99700AC Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: AC DC Offline Switcher

Topology:: Step-Down (Buck)

Internal Switch(s):: No

Number of Outputs:: 1

Voltage - Supply (Min):: 12V

Voltage - Supply (Max):: 500V

Voltage - Output:: -

Current - Output / Channel:: -

Frequency:: -

Dimming:: PWM

Applications:: Backlight, Signage

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOP

PAM99700AC FAQ

1.How can I place an order for PAM99700AC through Aetrix?

Please submit a Request for Quotation (RFQ) for PAM99700AC 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 PAM99700AC reliable?

The price and inventory of PAM99700AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM99700AC is usually 5 days.

3.What payment methods are accepted for PAM99700AC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM99700AC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PAM99700AC?

PAM99700AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PAM99700AC 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 PAM99700AC?

For technical support, including PAM99700AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM99700AC requirements.

6.How does Aetrix verify that PAM99700AC is sourced from the original manufacturer or authorized distributors?

All PAM99700AC 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 PAM99700AC meets industry standards.

7.What is the process for return or replacement of PAM99700AC?

All PAM99700AC units undergo pre-shipment inspection (PSI). If there is an issue with PAM99700AC, 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 PAM99700AC part is unused and in its original packaging.

Return procedure for PAM99700AC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…