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600mA Synchronous Dual Output Step-Down DC/DC Converters

1

2

3

4

5

6

12

11

10

9

8

7

Lx

PGND

VIN

CE

AGND

VOUT

XC9235/XC9236

Lx

VIN

CE

VOUT

XC9235/XC9236

■GENERAL DESCRIPTION

The XCM517 series is a multi combination module IC which comprises of two 600mA driver transistor built-in synchronous

step–down DC/DC converter. The XCM517 series is available in an ultra small package USP-12B01 suited for space

conscious applications.

The XCM517 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42ΩP-channel driver

transistor and 0.52ΩN-channel switching transistor, designed to allow the use of ceramic capacitors. The ICs enable a high

efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors connected

externally. Operating voltage range is from 2.7V to 6.0V. With the built-in oscillator, either 1.2MHz or 3.0MHz can be selected

for suiting to your particular application. As for operation mode, the XCM517xA / XCM517xB series are PWM control, the

XCM517xC / XCM517xD series are automatic PWM/PFM switching control, allowing fast response, low ripple and high

efficiency over the full range of loads (from light load to heavy load).

The soft start and current control functions are internally optimized. During stand-by, all circuits are 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

P-channel driver transistor is forced OFF when input voltage becomes 1.4V or lower.

■APPLICATIONS

●Mobile phones, Smart phones

●Bluetooth equipment

●Personal Device Assistances

●Portable games

●Digital still cameras, camcorders

■FEATURES

P-ch Driver Transistor Built-In

: ON resistance 0.42Ω

N-ch Driver Transistor Built-In

Input Voltage Range

: ON resistance 0.52Ω

: 2.7V ~ 6.0V

High Efficiency

: 92% (TYP.)

Output Current

: 600mA

Oscillation Frequency

: 1.2MHz, 3.0MHz (+15%)

Maximum Duty Cycle

Soft-Start Circuit Built-In

: 100%

Current Limiter Circuit Built-In

(Constant Current & Latching)

Ceramic Capacitor Compatible

Control Methods

: PWM (XCM517xA / XCM517xB)

PWM/PFM Auto (XCM517xC / XCM517xD)

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

Combination of voltage

1 ch

2ch

XCM517xx01D

1.2V

1.8V

XCM517xx02D

1.2V

3.3V

XCM517xx03D

1.8V

3.3V

XCM517xx06D

1.5V

1.8V

XCM517xx07D

1.5V

3.3V

*The other combination of voltage is semi-custom.

■TYPICAL APPLICATION CIRCUIT

ETR2425-007

* The dotted lines in the circuit indicates the connection using through-holes at the

backside of the PC board

(TOP VIEW)

VOUT1

AGND1

EN1

VIN2

Lx1

PGND1

VIN1

EN2

AGND2

VOUT2

Lx2

PGND2