Diodes Incorporated AP2004SL-13

Overview

AP2004SL-13 from Diodes Incorporated is a PWM buck controller IC designed for step-down DC/DC converter regulation in power-supply systems. It integrates a 1.25V reference, error amplifier, adjustable oscillator (up to 300 kHz), soft-start, UVLO (2.9V turn-on, 2.4V turn-off), and short-circuit protection. Delivered in SOP-8L package, it drives external P-MOSFETs in applications such as LCD monitor backlight inverters and CD-ROM/XDSL power supplies.

For engineers reviewing the AP2004SL-13 datasheet, AP2004SL-13 pinout, AP2004SL-13 application, or AP2004SL-13 equivalent, key selection considerations include its 3.6–27V input range, CT-adjustable switching frequency (10–300 kHz), 1.25V ±1% reference accuracy, push-pull output capable of ±200 mA, and integrated SCP with 50–160 mV standby threshold.

Technical Context

The AP2004SL-13 implements a fixed-frequency voltage-mode PWM control architecture with internal bandgap reference and error amplifier feeding into a comparator that modulates duty cycle based on feedback (FB) and timing capacitor (CT) inputs. Its oscillator frequency is directly set by CT (100–6800 pF), enabling precise adjustment from 10 kHz to 300 kHz.

Protection functions are hardware-based: UVLO disables operation below 2.4V VCC and re-enables above 2.9V; SCP latches off the output when the SCP pin voltage drops below 50–100 mV, with timeout programmable via external capacitor; soft-start ramps output via internal 20 µA current charging an external CSS capacitor.

Key Specifications

Pinout & Package

SOP-8L (Small Outline Package, 8-lead, lead-free, green molding compound) with standard 1.27 mm pitch, 4.9 mm × 6.0 mm body, and exposed thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PWM buck controller applications.

Compared with UC3843BD1R2G and TL5001CDR, the AP2004SL-13 uniquely combines voltage-mode control, integrated SCP with programmable timeout, and ±200 mA drive in SOP-8L - reducing BOM count and improving fault coverage in compact DC/DC designs.

Availability

AP2004SL-13 is available at Aetrix Electronics and suitable for backlight inverter power supplies, LCD monitor main rails, CD-ROM/XDSL power modules, and industrial DC/DC converters requiring stable component supply, RoHS-compliant packaging, and long-lifecycle support.

Supply support for AP2004SL-13 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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal devices, with emphasis on power management, signal integrity, and protection solutions.

The AP2004 belongs to Diodes' PWM controller product line, engineered for cost-effective, high-reliability non-isolated DC/DC conversion in consumer and industrial power supplies where integration, protection, and thermal robustness are critical.

FAQ

What is the maximum recommended VCC voltage for continuous operation?

The AP2004SL-13 has an absolute maximum VCC rating of 28 V, but the recommended operating maximum is 27 V per datasheet Section 3. Exceeding 27 V risks accelerated parametric drift and reduced long-term reliability, especially at elevated temperatures. Operation at 27 V is validated for full temperature range (-20°C to +125°C junction).

How is the oscillator frequency set, and what CT value gives 200 kHz?

Oscillator frequency is set solely by the capacitor connected to the CT pin; no resistor is required. Per datasheet Figure 5, a 270 pF capacitor yields a typical 200 kHz frequency at 25°C. Frequency varies ±10% across unit-to-unit and with VCC changes, so final tuning requires bench validation with actual load and layout.

Can the AP2004SL-13 drive an N-channel MOSFET directly?

No - the AP2004SL-13's OUT pin is a push-pull stage optimized for driving the gate of a P-channel MOSFET (e.g., AF9435P). Driving an N-channel device would require a high-side gate driver or bootstrap circuit, which is not supported internally. The block diagram and application circuit explicitly show P-MOSFET configuration.

What is the function of the SCP pin, and how is timeout configured?

The SCP pin monitors a voltage derived from a current-sense resistor; falling below ~60–75 mV triggers immediate latch-off. Timeout is set by an external capacitor (CSCP) tied between SCP and GND: per Figure 6, 45 nF yields ~20 ms timeout, 90 nF yields ~45 ms. No external resistor is needed - discharge is internal.