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Sky Works SKY87203

3.5 A Constant On-Time, Step-Down DC-DC Converter

Overview

TopologyBuck Converter
Input voltage2.7-6 V
Switching frequency600-1500 kHz
Output 13.6 V / 3.5 A

Description

The SKY87203 is a variable switching frequency, 3.5 A constant on-time, synchronous step-down converter. The device provides an output voltage from 0.9 V to 4.0 V from input voltage ranging from 2.7 V to 6.0 V, while keeping excellent line and load regulation and maximizing efficiency.The constant on-time control allows easy loop stabilization with minimal external components while providing fast transient response.Power sequencing is controlled by the EN and PG pins.The SKY87203 has cycle-by-cycle current limits and thermalshutdown to protect against fault conditions.The SKY87203 is available in a 12-pin, 2 mm  2 mm Quad Flat No-Lead (QFN) package. A typical application circuit is shown in Figure 1. The pin configuration and packages are shown in Figure 2. Signal pin assignments and functional pin descriptions are provided in Table 1.

Features

  • Input voltage range: 2.7 V to 6.0 V
  • Output voltage range: 0.9 V to 4.0 V
  • Variable switching frequency: 600 kHz to 1.5 MHz
  • Up to 3.5 A continuous output current
  • 95% peak efficiency
  • Typical switch on resistance: 50 m PMOS, 40 m NMOS
  • 80% light load efficiency
  • Power sequencing
  • Cycle-by-cycle over-current protection
  • Auto-discharge at power-off
  • Over-temperature protection
  • Control loop stabilization with low ESR ceramic capacitors
  • Soft start
  • Low profile, QFN (12-pin, 2 mm  2 mm) package (MSL1,260 C per JEDEC J-STD-020)

Typical applications

  • Set-top boxes
  • Access points
  • Portable devices

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC
(mΩ)
fres
(MHz)
Samples
74404063010
STE ALT EAG CAD LTS PSP SPE IGS CADWE-LQS SMT Power Inductor 1 5.2 7.5 10 130
Order Code Data­sheet
74404063010
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC
(mΩ)
fres
(MHz)
Samples