TC2054

Features:

• Very Low Supply Current (55µA Typ.) for Longer Battery Life
• Very Low Dropout Voltage: 140mV (Typ.) @ 150mA
• High Output Voltage Accuracy: ±0.4% (Typ)
• Standard or Custom Output Voltages
• Power-Saving Shutdown Mode
• ERROR Output Can Be Used as a Low Battery Detector or Processor Reset Generator
• Fast Shutdown Reponse Time: 60µsec (Typ)
• Over-Current Protection
• Space-Saving 5-Pin SOT-23A Package
• Pin Compatible Upgrades for Bipolar Regulators




Application

• Battery Operated Systems
• Portable Computers
• Medical Instruments
• Instrumentation
• Cellular / GSMS / PHS Phones
• Pagers




Pinout






Specifications

Parameter NameValueMax Input Voltage6Output Voltage (v)1.8, 2.5, 2.7, 2.8, 2.85, 3.0, 3.3Typical Active Current (A)55Typical Dropout Voltage @ Max. lout (mV)45Typical Output Voltage Accuracy (%)0.4Output Capacitor TypeCeramic/Aluminum/Tantalum

Parameter Name	Value
Max Input Voltage	6
Output Voltage (v)	1.8, 2.5, 2.7, 2.8, 2.85, 3.0, 3.3
Typical Active Current (A)	55
Typical Dropout Voltage @ Max. lout (mV)	45
Typical Output Voltage Accuracy (%)	0.4
Output Capacitor Type	Ceramic/Aluminum/Tantalum

Input Voltage .......................................................6.5V
Output Voltage..............................(-0.3) to (V_IN + 0.3)
Operating Temperature ................... -40< T_J< 125
Storage Temperature..........................-65 to +150
Maximum Voltage on Any Pin ..........V_IN +0.3V to -0.3V

*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods my affect device reliability.

Description

The TC2054, TC2055 and TC2186 are high accuracy (typically ±0.4%) CMOS upgrades for older (bipolar) low dropout regulators. Designed specifically for battery- operated systems, the devices' total supply current is typically 55µA at full load (20 to 60 times lower than in bipolar regulators).

The devices' key features include ultra low noise operation, very low dropout voltage - typically 45mV (TC2054); 90mV (TC2055); and 140mV (TC2186) at full load - and fast response to step changes in load. An error output (ERROR) is asserted when the devices are out-of-regulation (due to a low input voltage or excessive output current). Supply current is reduced to 0.5µA (max) and both V_OUT and ERROR are disabled when the shutdown input is low. The devices also incorporate over-current protection.

The TC2054, TC2055 and TC2186 are stable with a low esr ceramic output capacitor of 1µF and have a maximum output current of 50mA, 100mA and 150mA, respectively. This LDO Family also features a fast response time (60µsec typically) when released from shutdown.