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AP62201WU-7

2A 4.2-18V synchronous buck, forced PWM mode, COT, EMI optimized, TSOT-26

9560

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Manufacturer Part：

AP62201WU-7

Package：

TSOT-26 (2.9 x 1.6 x 0.8 mm)

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Description

Product Overview

The AP62201WU-7 is a Diodes Incorporated 2A, synchronous buck converter operating from 4.2V to 18V input. It is the forced-PWM variant of the AP62200WU, maintaining constant switching frequency regardless of load for low output ripple applications. It features COT control, integrated 90mΩ/65mΩ MOSFETs, and a proprietary EMI-optimized gate driver.

Key Specifications

Input Voltage Range 4.2V to 18V
Output Current 2A
Output Voltage Range 0.8V to 7V
Switching Frequency 750kHz (typical)
Operating Mode Forced PWM (FCCM)
High-Side RDS(ON) 90mΩ
Low-Side RDS(ON) 65mΩ
Operating Temperature -40°C to +125°C

Features

  • Forced continuous conduction mode (FCCM) for low output ripple
  • Constant On-Time (COT) control for fast transient response
  • Integrated 90mΩ/65mΩ MOSFETs
  • Proprietary EMI-optimized gate driver
  • Internal 2.5ms soft-start
  • EN pin with built-in current source for auto start-up
  • Cycle-by-cycle valley current limit
  • UVLO and thermal shutdown
  • Pin-compatible with AP62200WU (PFM version)

Applications

  • RF and communications power supplies requiring low ripple
  • Audio and DAC power rails sensitive to switching noise
  • FPGA and DSP core voltage with tight ripple requirements
  • 5V and 12V distributed power bus
  • Set-top boxes and networking equipment

The AP62201WU-7 is a Diodes Incorporated 2A synchronous buck converter with forced PWM (FCCM) operation from 4.2V to 18V. Unlike the PFM-mode AP62200WU, this variant maintains constant switching frequency at all loads for minimal output voltage ripple—critical for noise-sensitive RF, audio, and DAC power rails. It features integrated 90mΩ/65mΩ MOSFETs, COT control, proprietary EMI-optimized gate driver, and 2.5ms internal soft-start. Pin-compatible with AP62200WU in TSOT-26 package.

The AP62201WU-7 operates using constant-on-time (COT) control in forced continuous conduction mode (FCCM). Unlike PFM mode where the device skips pulses at light loads, FCCM forces the low-side MOSFET to conduct even during negative inductor current, maintaining constant switching frequency. This eliminates the variable frequency noise that can interfere with sensitive analog circuits. The proprietary gate driver scheme shapes the MOSFET switching edges to reduce high-frequency ringing on the SW node, minimizing radiated EMI. The on-time is adaptively calculated based on VIN/VOUT to maintain approximately 750kHz switching frequency. The valley current limit monitors the low-side current on a cycle-by-cycle basis for overcurrent protection.

Pin Mnemonic Description
1 BST Bootstrap capacitor pin
2 VIN Input supply voltage (4.2-18V)
3 EN Enable input (active high)
4 GND Ground
5 FB Feedback voltage input
6 SW Switch node output
  • RF transceiver power supply requiring constant-frequency low-ripple output
  • Audio DAC and codec analog power rail with minimal switching interference
  • FPGA core voltage (1.0V/1.2V) from 5V/12V with tight ripple specification
  • Networking equipment PLL and clock power with FCCM noise predictability
  • Drop-in replacement for AP62200WU when low-ripple operation is required
Model Manufacturer Key Difference
AP62200WU-7 Diodes Inc PFM mode version (pin-compatible)
AP62150WU-7 Diodes Inc 1.5A version (pin-compatible)
TLV62569 TI 2A, 5.5V, DCS-Control
MP2143GD MPS 2A, 18V, PFM/PWM selectable
SY8113 Silergy 3A, 18V, SOT-23-6
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