XC9259 Datasheet, PDF (1/28 Pages) Torex Semiconductor – COT Control, 1.0A Synchronous Step-Down DC/DC Converters

XC9259 Series
ETR05041-001
COT Control, 1.0A Synchronous Step-Down DC/DC Converters
˙GENERAL DESCRIPTION
ˑGreenOperation-compatible
The XC9259 series is a group of synchronous-rectification type DC/DC converters with a built-in P-channel MOS driver transistor
and N-channel MOS switching transistor, designed to allow the use of ceramic capacitors. Output voltage is internally set in a
range from 0.8V to 3.6V (accuracy: ±2.0%) increments of 0.05V. The device provides a high efficiency, stable power supply with
an output current of 1.0A to be configured using only a coil and two capacitors connected externally. Oscillation frequency is set to
1.2MHz or 6.0MHz can be selected for suiting to your particular application.
The operation mode is HISAT-COT ^(*) control, which has an excellent transient response. PWM control or PWM/PFM auto
switching control can be selected at the MODE pin, and a high-speed response, low ripple, and high efficiency are achieved
across the entire load range (from light loads to heavy loads).
During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less. As for the soft-start function
as fast as 0.3ms in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS
driver transistor is forced OFF when input voltage becomes 2.00V or lower. The B types integrate CL High Speed discharge
function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge.
The package is the ultra-small 1.2mm × 1.4mm × h0.3mm (LGA-8B01).
(*) _{HiSAT-COT is an original Torex term for High Speed Transient Response.}
˙APPLICATIONS

˔Mobile phones

˔Bluetooth headsets

˔Smart phones, Personal digital assistance

˙FEATURES
Input Voltage Range
Output Voltage Range
Oscillation Frequency
Output Current
Control Methods
˔Portable game consoles

˔Digital still cameras, Camcorders

˔Point-of-Load (POL)
Protection Circuits
˔Wearable devices

Functions
Capacitor
Operating Ambient Temperature
Package
Environmentally Friendly
: 2.5Vʙ5.5V
: 0.8Vʙ3.6V (ʶ2.0%)
: 1.2MHz, 6.0MHz
: 1A
: HiSAT-COT Control
100% Duty Cycle
PWM Control
PWM/PFM Auto
: Thermal Shutdown
Current Limit (Pendent character)
Short Circuit Protection (Type B)
: Soft-Start
UVLO
CL High Speed Discharge (Type B)
: Ceramic Capacitor
: - 40ˆ ʙ + 105ˆ
: LGA-8B01
: EU RoHS Compliant, Pb Free
˙TYPICAL APPLICATION CIRCUIT

-
70 65
7*/
"
7*/
-Y
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70 65
"( /%
.0%&
CIN
.0%&
CL
1(/%
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˙TYPICAL PERFORMANCE
CHARACTERISTICS

XC9259B18C
L =LTF5022T-4R7N2R0(4.7ЖH)
C_IN = 10ЖF(GRM155R61A106M) C_L = 10ЖF(GRM155R61A106M)
100
90
80
70
V_IN=5.0V
60
V_IN=3.7V
50
V_IN=5.0V
40
30
V_IN=3.7V
20
PWM/PFM
10
PWM
0





Output Current: I_OUT (mA)
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