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Inductor Built-in Step-Down “micro DC/DC” Converters

0

20

40

60

80

100

0.1

1

10

100

1000

VIN= 5.5V

5.0V

4.2V

VOUT=3.3V

(PWM)

XCL206/XCL207(PWM/PFM)

XCL205/XCL207

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TYPICAL PERFORMANCE

CHARACTERISTICS

☆

GreenOperation Compatible

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APPLICATIONS

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Mobile phones, Smart phones

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Bluetooth Headsets

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WiMAX PDAs, MIDs, UMPCs

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Portable game consoles

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Digital cameras, Camcorders

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Electronic dictionaries

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TYPICAL APPLICATION CIRCUIT

ETR2801-005b

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GENERAL DESCRIPTION

The XCL205/XCL206/XCL207 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a

control IC in one tiny package (2.5mm×2.0mm, H=1.0mm). A stable power supply with an output current of 600mA is

configured using only two capacitors connected externally.

Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from 0.8V to 4.0V in increments of

0.05V. The device is operated by 3.0MHz, and includes 0.42ΩP-channel driver transistor and 0.52ΩN-channel switching

transistor. As for operation mode, the XCL205 series is PWM control, the XCL206 series is automatic PWM/PFM switching

control and the XCL207 series can be manually switched between the PWM control mode and the automatic PWM/PFM

switching control mode, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to

heavy load). During stand-by, the device is shutdown to reduce current consumption to as low as 1.0μA or less. With the

built-in UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage becomes 1.4V

or lower. XCL205B/XCL206B/XCL207B series provide short-time turn-on by the soft start function internally set in 0.25 ms

Vss

CE/MODE

Vss

CL

10μF

4.7μF

CIN

L1

L2

600mA

(TOP VIEW)

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FEATURES

Ultra Small

: 2.5mm×2.0mm, H=1.0mm

Input Voltage

: 2.0V ~ 6.0V

Output Voltage

: 0.8V ~ 4.0V (+2.0%)

: 85% (TYP.)

Output Current

: 600mA

Oscillation Frequency

: 3.0MHz (+15%)

Maximum Duty Cycle

: 100%

Control Methods

: PWM (XCL205)

PWM/PFM Auto (XCL206)

PWM/PFM Manual (XCL207)

High Speed Soft-Start Circuit Built-In

Current Limiter Circuit Built-In (Constant Current & Latching)

Low ESR Ceramic Capacitor Compatible

* Performance depends on external components and wiring on the PCB.

XCL205A333xx/XCL206A333xx/XCL207A333xx

XCL205/206/207 Series