XC9246 Datasheet, PDF (1/31 Pages) Torex Semiconductor – 16V Driver Transistor Built-In Step-Down DC/DC Converters

XC9246/XC9247 Series
ETR05024-004
16V Driver Transistor Built-In Step-Down DC/DC Converters
˙GENERAL DESCRIPTION
ˑGreenOperation-compatible
ç XC9246/XC9247 series is a 16V step-down DC/DC converter with a built-in driver transistor. The series provides high
efficiency, and a stable power supply with output currents up to 1A. The series is designed for use with small ceramic capacitors.
The series has a 1.0V reference voltage, and using externally connected resistors, the output voltage can be set freely. With an
internal switching frequency of 1.2MHz, small external components can be used. The soft-start time is internally set to 1.5ms (TYP.),
but can be adjusted to set a longer time using an external resistor and capacitor.
As for operation mode, the XC9246 series is PWM control and the XC9247 series is automatic PWM/PFM switching control.
In PWM/PFM switching control mode, provides fast response, low ripple and high efficiency over the full range of loads (from light
load to heavy load).
With the UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage becomes
lower than detect voltage. The series includes current limit, thermal shutdown, and short-circuit protection.
Two types of package SOT-26W and USP-6C are available.
˙APPLICATIONS
˔LCD-TVs
˔BD/HDDçrecorders
˔Set top boxç
˔Home video game consolesçç
˔Multifunction printersç
˙TYPICAL APPLICATION CIRCUIT
˙FEATURES
Input Voltage
Output Voltage Range
Output Current
Efficiency
Oscillation Frequency
Maximum Duty Cycle
Soft-start Time
Control Methods
Protection Circuits
UVLO
Output Capacitor
Operating Ambient Temperature
Packages
Environmentally Friendly
ç
: 4.5V～16V
(The V_IN range depends on the product)
: 1.2V～5.6V (V_FB=1.0V)
(The V_OUT range depends on the product)
: 1A (V_IN≧6V and V_OUT/V_IN≦50%)
1A (V_IN＜6V and V_OUT/V_IN≦40%)
: 90%(V_IN=12V, V_OUT=5V, I_OUT=200mA)
: 1.2MHz
: 80%
: Internally fixed 1.5ms
Adjustable by RC
: PWM Control (XC9246)
PWM/PFM Automatic switching control (XC9247)
: Current limiter (Integral Latching)
Thermal shutdown
Short-circuit protection
: 4.15V, 5.65V, 7.65V
: Ceramic Capacitor Compatible
: -40℃～+85℃
: USP-6C, SOT-26W
: EU RoHS Compliant, Pb Free
˙TYPICAL PERFORMANCE
CHARACTERISTICS
XC9246B75/XC9247B75 (V_OUT=5.0V)
L=6.8μF(VLP4045LT-6R8M), SBD=XBS204S17R
C_IN=10μF(TMK316BJ106KL), C_L=10μF×2(LMK212ABJ106KG)
100
90
80
70
60
50
40
30
20
10
0
1
XC9246@VIN=12V
XC9247@VIN=12V
10
100
Output Current :I_OUT(mA)
1000
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