The EH11A is a low-dropout linear regulator that can maintain a stable output voltage even with a low voltage difference. The chip offers a variety of output voltage options and an output current of up to 1A, making it suitable for a variety of power management applications.
Part Number: AZ1117H-ADJTRE1
Marking Code: EH11A
Function: 1A, low dropout linear regulator
Package: SOT-223 type
Manufacturer: Diodes Incorporated
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Description
The EH11A is a series of low dropout three-terminal regulators with a dropout of 1.15V at 1A output current.
The AZ1117 series provides current limiting and thermal shutdown. Its circuit includes a trimmed bandgap reference to assure output voltage accuracy to be within 1% for 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, 5.0V and adjustable versions or 2% for 1.2V version. Current limit is trimmed to ensure specified output current and controlled short-circuit current. On-chip thermal shutdown provides protection against any combination of overload and ambient temperature that would create excessive junction temperature.
The AZ1117 has an adjustable version, which can provide the output voltage from 1.25V to 12V with only 2 external resistors.
The basic components of an LDO are as follows:
1. Pass Transistor: Regulates the input voltage to generate the output voltage. Usually a PNP bipolar transistor or PMOS transistor is used.
2. Error Amplifier: Compares the reference voltage to the feedback voltage and amplifies the difference.
3. Reference Voltage Source: Provides a stable reference voltage.
4. Feedback Network: Monitors the output voltage and feeds feedback to the error amplifier.
Features
1. Low Dropout Voltage: 1.15V at 1A Output Current
2. Trimmed Current Limit
3. On-chip Thermal Shutdown
4. Three-terminal Adjustable or Fixed 1.2V, 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, 5.0V
5. Operation Junction Temperature: -40 to +125 °C
Pinouts
Absolute maximum ratings ( Ta=25°C )
1. Input Voltage: Vin=20V
2. Operating Junction Temperature: Tj= 150 °C
3. Storage Temperature: Ts= -65 to +150 °C
4. ESD (Human Body Model): 2000 V
5. ESD (Machine Model): 250 V
Applications
1. PC Motherboard
2. LCD Monitor
3. Graphic Card
4. DVD-video Player
5. NIC/Switch
6. Telecom Equipment
7. ADSL Modem
8. Printer and other Peripheral Equipment
EH11A Datasheet PDF
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