150kHz, 2A PWM Buck DC/DC Converter
TJ1509A
FEATURES
SOP-8 PKG
●
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
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ON/OFF shutdown control input
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Operating voltage can be up to 26V
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Output load current: 2A
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SOP-8L packages
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Low power standby mode
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Built-in switching transistor on chip
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Moisture Sensitivity Level 3
PIN 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
APPLICATIONS
●
Simple High-efficiency step-down regulator
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On-card switching regulators
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Positive to negative converter
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Negative Step-Up Converters
●
Power Supply for Battery Chargers
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
DESCRIPTION
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
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
