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TJ1509A Schematic ( PDF Datasheet ) - HTC Korea

Teilenummer TJ1509A
Beschreibung 2A PWM Buck DC/DC Converter
Hersteller HTC Korea
Logo HTC Korea Logo 




Gesamt 8 Seiten
TJ1509A Datasheet, Funktion
150kHz, 2A PWM Buck DC/DC Converter
TJ1509A
FEATURES
Output voltage: 3.3V, 5V, 12V and adjustable
output version
Adjustable version output voltage range,
1.23V to 18V+4%
150KHz +15% fixed switching frequency
Voltage mode non-synchronous PWM control
Thermal-shutdown and current-limit protection
ON/OFF shutdown control input
Operating voltage can be up to 26V
Output load current: 2A
SOP-8L packages
Low power standby mode
Built-in switching transistor on chip
Moisture Sensitivity Level 3
SOP-8 PKG
PIN DESCRIPTION
APPLICATIONS
Simple High-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
Negative Step-Up Converters
Power Supply for Battery Chargers
DESCRIPTION
Pin No
1
2
3
4
5~8
Function
Vin
Vout
FB
SD
Ground
Description
Operating voltage input
Switching output
Output voltage feedback control
ON/OFF Shutdown
Ground
ORDERING INFORMATION
Device
TJ1509AD-ADJ
TJ1509AD-3.3
TJ1509AD-5.0
TJ1509AD-12
Marking
TJ1509A ADJ
TJ1509A 3.3
TJ1509A 5.0
TJ1509A 12
Package
SOP-8
The TJ1509A series are monolithic IC designed for a step-down DC/DC converter, and own the ability of
driving a 2A load without additional transistor component. Due to reducing the number of external
component, the board space can be saved easily. The external shutdown function can be controlled by
logic level and then come into standby mode.
The internal compensation makes feedback control have good line and load regulation without external
design. Regarding protected function, thermal shutdown is to prevent over temperature operating from
damage, and current limit is against over current operating of the output switch. If current limit function
occurred and VFB is down to 0.5V below, the switching frequency will be reduced.
The TJ1509A series operates at a switching frequency of 150KHz thus allowing smaller sized filter
components than what would be needed with lower frequency switching regulators. Other features
include a guaranteed +4% tolerance on output voltage under specified input voltage and output load
conditions, and +15% on the oscillator frequency.
The output version included fixed 3.3V, 5V, 12V, and an adjustable type.
The packages are available in a standard 8-lead SOP-8 package.
Mar. 2010 - R1.3
-1-
HTC
Free Datasheet http://www.datasheet4u.com/






TJ1509A Datasheet, Funktion
150kHz, 2A PWM Buck DC/DC Converter
TJ1509A
TYPICAL PERFORMANCE CHARACTERISTICS
TJ1509A Efficiency vs. Temperature
(Vin=12V, Vout=5V, Io=2A)
TJ1509A Efficiency vs. Temperature
(Vin=12V, Vout=3.3V, Io=2A)
TJ1509A Saturation Voltage vs. Temperature
(Vcc=12V, Vfb=0V, VSD=0)
TJ1509A Switch Current Limit vs. Temperature
(Vcc=12V, Vfb=0V)
TJ1509A Supply Current vs. Temperature
(Vcc=12V, No Load, Von/off=0V(Switch ON), Von/off=5V(Switch OFF))
-6-
HTC
Free Datasheet http://www.datasheet4u.com/

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