EL7531

Monolithic 1A Step-Down Regulator with Low Quiescent Current

OVERVIEW

The EL7531 is a synchronous, integrated FET 1A step-down regulator with internal compensation. It operates with an input voltage range from 2.5V to 5.5V, which accommodates supplies of 3.3V, 5V, or a Li-Ion battery source. The output can be externally set from 0.8V to VIN with a resistive divider.

The EL7531 features automatic PFM/PWM mode control, or PWM mode only. The PWM frequency is typically 1.4MHz and can be synchronized up to 12MHz. The typical no load quiescent current is only 120µA. Additional features include a Power-Good output, <1µA shut-down current, short-circuit protection, and over-temperature protection.

The EL7531 is available in the 10-pin MSOP package, making the entire converter occupy less than 0.15 in2 of PCB area with components on one side only. The 10-pin MSOP package is specified for operation over the full -40°C to +85°C temperature range.

KEY FEATURES

  • Less than 0.15 in2 (0.97 cm2) footprint for the complete 1A converter
  • Components on one side of PCB
  • Max height 1.1mm MSOP10
  • Power-Good (PG) output
  • Internally-compensated voltage mode controller
  • Up to 94% efficiency
  • <1µA shut-down current
  • 120µA quiescent current
  • Overcurrent and over-temperature protection
  • External synchronizable up to 12MHz
  • Pb-Free plus anneal available (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
EL7531
Basic Information
Production Status
Mass Production
Topology
Buck
# of Outputs
1
Input Voltage Min (V)
2.5
Input Voltage Max (V)
5.5
Output Voltage Min (V)
0.8
Output Voltage Max (V)
5.5
Output Current Max (A)
1
IQ
120 µA
Switching Freq. (max) (MHz)
1.4
Switching Freq. (min) (MHz)
1.4
Max Duty Cycle (%)
See Datasheet
Qualification Level
Standard
Peak Efficiency (%)
94
POR
Yes
BOM Total Footprint (mm2)
503.2
SYNCH Capability
Yes
Control Type
Voltage Mode
Switching Frequency Range (MHz)
1.4
Can Sample
YES
Temperature Range
-40 to +85

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