Datasheet

EL7531
Monolithic 1A Step-Down Regulator with Low Quiescent Current

Not Recommended for New Designs.
Recommended Replacement Part ISL9106 (not pin-for-pin).

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Typical Diagram

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)

Description

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 V_IN 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.