LX1918CLD (#71665) |
Product Status
Obsolete |
Overview
The Microsemi LX1918 is a step down buck regulator with a synchronous rectifier. All MOSFET switches and compensation components are built in. The synchronous rectification eliminates the need of an external Schottky diode and maximizes efficiency (>95%) for a high step-down ratio and a low output voltage. The input supply voltage range is from 2.7V to 5.5V with a maximum output current of 1.8A. The LX1918 is a current mode PWM with optional PFM under light loads. The LX1918 can switch with a 1MHz free running internal oscillator or be synchronized with an external oscillator ranging from 500KHz to 1.25MHz; the high frequency allows for small size and low cost external components. The LX1918 output voltage is programmable with two resistors and can be tightly regulated down to 0.6V. The LX1918 MODE feature can either maximize efficiency or reduce EMI depending on the needs of the application. High efficiency (MODE = GND) is obtained by allowing the LX1918 to enter a PFM mode with discontinuous inductor current. Low EMI (MODE=VCC) is obtained by only operating in PWM mode even at no load. The LX1918 features include soft start, cycle-by-cycle switch current limit, hiccup short circuit current limiting and thermal shut down. The LX1918 comes in small 8 pin MLP package (fully RoHS compliant). FEATURES: o Input range voltage 2.7 to 5.5V o Maximum output current, 1.8A o Internal or External Synchronization o Output Voltage from VIN to 0.6V o PFM or PWM mode under light load o EMI support with force PWM mode o Efficiency up to 95% o No external Schottky diode o Thermal shutdown o Cycle by cycle switch current limit o UVLO o Short circuit protection o 8 pin MLP APPLICATIONS: o Lower power embedded applications o WLAN power system o Portable design with single cell Lion or 3 cells NiMH/NiCd o Low power portable storage application |
Package Carrier: | NULL |
Electrical Rating | Symbol | Min | Typ | Max | Unit |
---|---|---|---|---|---|
Output Current (A) | IOUT | 1.8 | A | ||
Output Voltage (V) | VO | 0.6 | 3.3 | V | |
Supply Voltage | VCC | 2.7 | 5.5 | V | |
Switching Frequency (kHz) | fs | 750 | 1000 | 1250 | kHz |
Environmental Rating | Symbol | Min | Typ | Max | Unit |
---|---|---|---|---|---|
Operating Temperature | TA | -40 | 85 | °C | |
Storage Temperature (oC) | TSTG | -65 | 150 | °C |
Undefined | Symbol | Min | Typ | Max | Unit |
---|---|---|---|---|---|
Regulated Outputs | OutR | 1 | Select |
Resources
Datasheets | |
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LX1918 Datasheet |
App Notes | |
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TN-206:Voltage-Mode, Current-Mode (and Hysteretic Control) |
Literature | |
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LX1918 Evaluation Board | |
Microsemi Programmable Logic Power Management Selection Guide |
Reliability | |
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Quality & Reliability Report - Aliso Viejo, CA, USA - Garden Grove, CA, USA - San Jose, CA, USA |
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