HT78BXX Datasheet, PDF (1/16 Pages) Holtek Semiconductor Inc – High PSRR 500mA LDO Regulator

HT78Bxx
High PSRR 500mA LDO Regulator
Features
• Output Voltage: 1.5V/1.8V/2.5V/2.8V/
3.0V/3.3V/5V
• High Output Voltage Accuracy: ±2%
• HT78B25 Low Voltage Drop: 0.64V (Typ.)
(V_OUT=2.5V @ I_OUT=500mA)
• Maximum Input Voltage: 7.0V
• Guaranteed Output Current: 500mA
• Low Power Consumption: 18µA (Typ.)
• High Ripple Rejection: 70dB (1kHz@I_OUT=30mA)
• Power-Saving Shutdown Mode
• Over Temperature Protection
• Current Limiting
• SOT-23-5, SOT223, SOT89 Package
Applications
• Portable communication equipment
• Portable music player
• Electrical appliances such as cameras, VCRs and
camcorders
• Battery-powered equipment
General Description
The HT78Bxx series are CMOS-based voltage
regulator ICs with high output voltage accuracy, low
quiescent current, low on Resistance, and high ripple
rejection. Each of these ICs consists of a voltage
reference unit, an error amplifier, resistor-net for
voltage setting, a current limit circuit, a chip enable
circuit, and so on.
The HT78Bxx’s current limiters' fold back circuit
also operates as a short circuit protect function for the
output current limiter.
These ICs perform with low dropout voltage and the
chip-enable function. The quiescent current of this
IC is only 18μA, and the line transientresponse and
the load transient response of HT78Bxx are excellent,
thus these ICs are very suitable for the power supply
for hand-held communication equipment.
The space-saving SOT23-5, SOT223 and SOT89
package will be an attractive additional feature for
pocket and hand-held applications.
Selection Table
Part No.
HT78B15
HT78B18
HT78B25
HT78B28
HT78B30
HT78B33
HT78B50
Output Voltage
1.5V
1.8V
2.5V
2.8V
3.0V
3.3V
5.0V
Tolerance
±2%
Package
SOT23-5
SOT223
SOT89
Rev. 1.00
1
August 25, 2011