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HT2576 Datasheet

3A Step-Down Voltage Regulator

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HT2576
3A Step-Down Voltage Regulator
GENERAL DESCRIPTION
The HT2576 Series are step-down switching
regulators with all required active functions. It is
capable of driving 3A load with excellent line and
load regulations. These devices are available in
fixed output voltages of 3.3V, 5V, 12V and an
adjustable output version.
The HT2576 series offers a high-efficiency
replacement for popular three-terminal linear
regulators. Also it requires a minimum number of
external components. It substantially not only
reduces the area of board size but also the size of
heat sink, and in some cases no heat sink is
required. The ±4% tolerance on output voltage
within specified input voltages and output load
conditions is guaranteed. Also, the oscillator
frequency accuracy is within ±10%. External
shutdown is included. Featuring 80µA (typical)
standby current. The output switch includes
cycle-by-cycle current limiting, as well as thermal
shutdown for full protection under fault conditions.
This series are offered in 5-pin TO-263,
TO-220 package.
FEATURES
‹ Guaranteed 3A output current.
‹ 3.3V, 5V, 12Vand adjustable versions,
‹ Wide input voltage range, up to 45V
‹ Internal oscillator of 52KHz fixed frequency.
‹ Wide adjust version output voltage range,
from 1.23V to 37V ±4% max. at over line and
load conditions.
‹ Low standby current, typ. 80µA, at shutdown
mode
‹ Requires only 4 external components
‹ Thermal shutdown and current limit
protection
‹ P+ product enhancement tested
APPLICATIONS
‹ LCD Monitors.
‹ ADD-ON Cards Switching Regulators
‹ ADD-ON Cards Switching Regulators
‹ High Efficiency Step-Down Regulators
‹ Efficient Pre-regulator for Linear Regulators
‹ Positive to Negative converter (Buck-Boost)
Block Diagram
DC Input
+
Vin
1
4
Feed
Back
R2
+-
R1
1K
1.23V
Band-Gap
Reference
Internal
Regulator
Enable
Enable
5
Fixed Gain
3Amp.
Error amp. Comparator Driver Switch
+-
Thermal
Shutdown
52KHz
Oscillator
Reset
Current
Limited
Output
2
3
L1
+
Cout
D1
Ver1.0
1




HOTCHIP

HT2576 Datasheet Preview

HT2576 Datasheet

3A Step-Down Voltage Regulator

No Preview Available !

OB2269
Ordering Information
HT2576
Part No.
HT2576T-XX
HT2576T-ADJ
HT2576S-ADJ
HT2576S-XX
Operating Temp.
(Ambient)
-20 ~ +85
Package
TO-220-5L
TO-263-5L
Note: Where XX denotes voltage option, Available are 12V, 5V and 3.3V. Leave blank for
adjustable version. Contact factory for additional voltage options.
Pin assignment
TO-220
TO-263
1. Input
2. Output
3. Ground
4. Feedback
5. Enable
Absolute Maximum Ratings
Input voltage
Vin
ENABLE Pin Input Voltage
Vin (operate)
Power Dissipation
PD
Operating Junction Temperature Range
TJ
Storage Temperature Range
TSTG
+45
-0.3V V Vin
Internal Limited
-40 ~ +150
-65 ~ +150
Lead Soldering Temperature (260)
TO-220-5L / TO-263-5L
Package
10
V
V
W
S
Ver1.0
2


Part Number HT2576
Description 3A Step-Down Voltage Regulator
Maker HOTCHIP
Total Page 9 Pages
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