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MaxLinear SP6121

Low Voltage, Synchronous Step Down PWM Controller

Overview

TopologyBuck Converter
Input voltage3-7 V
Switching frequency440-560 kHz
Output 15 V / 8 A

Description

The SP6121 is a fixed frequency, voltage mode, synchronous PWM controller designed to workfrom a single 5V or 3.3V input supply, providing excellent AC and DC regulation for high efficiencypower conversion. The operating frequency is internally set at 500kHz, permitting the use ofsmall, surface mount inductors and capacitors. Requiring only few external components, theSP6121 packaged in an 8-pin SOIC, is especially suited for low voltage applications where cost,small size and high efficiency are critical. With its low voltage capability and inherent 100% dutycycle operation, the SP6121 allows low dropout operation in the event of a low input supplyvoltage condition.

Features

  • Optimized for Single Input Voltage - 3V to 5.5V

  • High Efficiency: Greater than 95% possible

  • Accurate, 500kHz Fixed Frequency Operation

  • Fast Transient Response

  • 500μA, IQ (25μA in Shutdown)

  • Internal, 0.4 V/ms, Soft Start Circuit

  • Precision 1% Reference

  • Resistor Programmable Output Voltage

  • Lossless Adjustable Current Limit with

  • High Side RDS(ON) Sensing

  • 0% to 100% Duty Cycle Range

  • High Side PMOS Switch Negates Need for

  • External Charge Pump

  • Output Over Voltage Protection

  • Hiccup Mode Current Limit Protection

Typical applications

  • Supply Bias for Microprocessor Core
  • Supply Bias for DSP
  • Video Cards
  • Supply Bias for I/O & Logic
  • Board Level Supply in Distributed Power Systems

Products

Order Code Data­sheet Downloads Product seriesL1
(µH)
L2
(µH)
IR 1
(A)
IR 2
(A)
ISAT 1
(A)
RDC1 typ
(Ω)
RDC2 typ
(Ω)
RDC1 max
(Ω)
RDC2 max
(Ω)
fres 1
(MHz)
Type Samples
744870004
STE ALT EAG CAD LTS PSP IGS CADWE-DD SMT Shielded Coupled Inductor 4.7 4.7 3.6 3.6 10 0.025 0.025 0.03 0.03 34 Crossed
Order Code Data­sheet
744870004
Samples
Order Code Data­sheet Downloads Product seriesL1
(µH)
L2
(µH)
IR 1
(A)
IR 2
(A)
ISAT 1
(A)
RDC1 typ
(Ω)
RDC2 typ
(Ω)
RDC1 max
(Ω)
RDC2 max
(Ω)
fres 1
(MHz)
Type Samples