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Torex Semiconductor

XC9259 Datasheet Preview

XC9259 Datasheet

1.0A Synchronous Step-Down DC/DC Converters

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XC9259 Series
ETR05041-001
COT Control, 1.0A Synchronous Step-Down DC/DC Converters
GENERAL DESCRIPTION
GreenOperation-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
: 2.5V 5.5V
: 0.8V 3.6V ( 2.0%)
: 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
: - 40
+ 105
: LGA-8B01
: EU RoHS Compliant, Pb Free
TYPICAL APPLICATION CIRCUIT
CIN CL
TYPICAL PERFORMANCE
CHARACTERISTICS
XC9259B18C
L =LTF5022T-4R7N2R0(4.7 H)
CIN = 10 F(GRM155R61A106M) CL = 10
100
F(GRM155R61A106M)
90
80
70 VIN=5.0V
60
VIN=3.7V
50
VIN=5.0V
40
30 VIN=3.7V
20
PWM/PFM
10 PWM
0
Output Current: IOUT (mA)
1/28




Torex Semiconductor

XC9259 Datasheet Preview

XC9259 Datasheet

1.0A Synchronous Step-Down DC/DC Converters

No Preview Available !

XC9259 Series
BLOCK DIAGRAM
1) XC9259 Series Type A
VOUT
AGND
CE
CFB
R1
Phase
Compensation
Error Amp.
Comparator
+
-
-
+
R2
Vref with
Soft Start
CE Control Logic,
UVLO,
Thermal Shutdown
SQ
R
Minimum
On Time
Generator
High Side
Current Limit
Logic
Synch.
Buffer
Driver
VIN
VOUT
PWM/PFM
Selector
* Diodes inside the circuit are an ESD protection diode and a parasitic diode.
VIN
Lx
PGND
MODE
2) XC9259 Series Type B
* Diodes inside the circuit are an ESD protection diode and a parasitic diode.
2/28


Part Number XC9259
Description 1.0A Synchronous Step-Down DC/DC Converters
Maker Torex Semiconductor
Total Page 28 Pages
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