LX7188ILU-TR

LX7188ILU-TR Datasheet

LX7188

Part	Datasheet
LX7188ILU-TR	LX7188ILU-TR (pdf)

PDF Datasheet Preview
LX7188 1.4MHz, 1A Synchronous Buck Converter The LX7188 is 1.4MHz fixed frequency, currentmode, synchronous PWM buck step-down DC-DC converter, capable of driving a 1A load with high efficiency, excellent line and load regulation. The device integrates synchronous P-channel and Nchannel power MOSFET switches with low onresistance. They accept an input voltage range from 2.5V to 5.5V and will enter 100% duty cycle at dropout making them ideal for powering portable equipment that runs from a single Li-ion battery. A standard series of inductors are available from several different manufacturers optimized for use with the LX7188. This feature greatly simplifies the design of switch-mode power supplies. The converter includes standard safety features such as over-current, short-circuit and thermal shutdown protection. This device is available in a UDFN 2x2 6L package. • Input Supply Range 2.5V to 5.5V • Output Adjustable from 0.6V to VIN 0.5V • 100% Duty Cycle in Dropout • Integrated NMOS & PMOS Switches • Current Mode Control • 1A Maximum Output Current • Fixed 1.4MHz Frequency • High Efficiency Up To 96% • Built-in Soft-start • Built-in UV & OT Protection • Built-in Short Circuit Protection • RoHS Compliant & Halogen Free • UDFN 2x2 6L Package • Datacom • Portable Devices • Smart Phone VIN CIN 4.7µF ON OFF 5 L 2.2µH SW LX7188 Figure 1 • Typical Application of LX7188 VOUT COUT 22µF 2013 Microsemi Corporation 1.4MHz 1A Synchronous Buck Converter Pin Configuration and Pinout 7188 YWWL Figure 2 • Pinout UDFN 2x2 6L Top View Marking Line1 7188 Line2 YWWL Year/Work Week/Lot Code Ordering Information Ambient Temperature Type -40°C to 85°C RoHS Compliant, Pb-free Package UDFN 2x2 6L LX7188ILU-TR Packaging Type Bulk / Tube Tape and Reel Pin Description Number Designator Enable Input. Setting this pin above 1.5V enables the IC. Setting this pin below 0.4V shuts down the IC. When the IC is in shutdown mode, all functions are disabled to decrease the supply current below 1µA. Ground Pin. Supply Input Pin. A 4.7µF ceramic capacitor should be connected between the VIN pin and GND pin to bypass the supply. Power Switch Output Pin. Inductor connection to drain of the internal PFET and NFET switches. Feedback Pin. This pin is connected to an external resistor divider to program the system output voltage. Block Diagram Block Diagram VIN GND VOLTAGE REFERENCE 0.6V 6 ERROR AMPLIFIER OSCILLATOR CURRENT SENSE VOCP COMPARATOR CURRENT LIMIT 0.4V DRIVER SHORT CIRCUIT PROTECTION LOGIC CLK Figure 3 • Simplified Block Diagram of LX7188 3 1.4MHz 1A Synchronous Buck Converter Absolute Maximum Ratings Parameter Units VIN to GND EN, FB to GND VIN + SW to GND

PDF Datasheet Preview

LX7188
1.4MHz, 1A Synchronous Buck Converter

The LX7188 is 1.4MHz fixed frequency, currentmode, synchronous PWM buck step-down DC-DC converter, capable of driving a 1A load with high efficiency, excellent line and load regulation. The device integrates synchronous P-channel and Nchannel power MOSFET switches with low onresistance. They accept an input voltage range from 2.5V to 5.5V and will enter 100% duty cycle at dropout making them ideal for powering portable equipment that runs from a single Li-ion battery.

A standard series of inductors are available from several different manufacturers optimized for use with the LX7188. This feature greatly simplifies the design of switch-mode power supplies.

The converter includes standard safety features such as over-current, short-circuit and thermal shutdown protection. This device is available in a UDFN 2x2 6L package.
• Input Supply Range 2.5V to 5.5V
• Output Adjustable from 0.6V to VIN 0.5V
• 100% Duty Cycle in Dropout
• Integrated NMOS & PMOS Switches
• Current Mode Control
• 1A Maximum Output Current
• Fixed 1.4MHz Frequency
• High Efficiency Up To 96%
• Built-in Soft-start
• Built-in UV & OT Protection
• Built-in Short Circuit Protection
• RoHS Compliant & Halogen Free
• UDFN 2x2 6L Package
• Datacom
• Portable Devices
• Smart Phone

VIN CIN
4.7µF

ON OFF
5 L 2.2µH SW

LX7188

Figure 1
• Typical Application of LX7188

VOUT

COUT 22µF
2013 Microsemi Corporation
1.4MHz 1A Synchronous Buck Converter

Pin Configuration and Pinout
7188 YWWL

Figure 2
• Pinout UDFN 2x2 6L Top View Marking Line1 7188 Line2 YWWL Year/Work Week/Lot Code
Ordering Information

Ambient Temperature

Type
-40°C to 85°C

RoHS Compliant, Pb-free

Package UDFN 2x2 6L

LX7188ILU-TR

Packaging Type

Bulk / Tube Tape and Reel

Pin Description

Number Designator

Enable Input. Setting this pin above 1.5V enables the IC. Setting this pin below 0.4V
shuts down the IC. When the IC is in shutdown mode, all functions are disabled to
decrease the supply current below 1µA.

Ground Pin.

Supply Input Pin. A 4.7µF ceramic capacitor should be connected between the VIN pin and GND pin to bypass the supply.

Power Switch Output Pin. Inductor connection to drain of the internal PFET and NFET switches.

Feedback Pin. This pin is connected to an external resistor divider to program the system output voltage.

Block Diagram

Block Diagram

VIN GND

VOLTAGE REFERENCE
0.6V 6

ERROR AMPLIFIER

OSCILLATOR

CURRENT SENSE

VOCP

COMPARATOR CURRENT LIMIT
0.4V

DRIVER

SHORT CIRCUIT PROTECTION

LOGIC CLK

Figure 3
• Simplified Block Diagram of LX7188 3
1.4MHz 1A Synchronous Buck Converter

Absolute Maximum Ratings

Parameter

Units

VIN to GND

EN, FB to GND

VIN +

SW to GND

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived LX7188ILU-TR Datasheet file may be downloaded here without warranties.

Datasheet ID: LX7188ILU-TR 649030