Document
Si9182
Vishay Siliconix
Micropower 250-mA CMOS LDO Regulator With Error Flag/Power-On-Reset
FEATURES
Low 105-mV Dropout at 250-mA Load Guaranteed 250-mA Output Current 500-mA Peak Output Current Capability Uses Low ESR Ceramic Output Capacitor Fast Load and Line Transient Response Only 100-mV(rms) Noise With Noise Bypass Capacitor D 1-mA Maximum Shutdown Current D Built-in Short Circuit and Thermal Protection D Out-Of-Regulation Error Flag (Power Good or POR) D D D D D D D Fixed 1.215-V, 1.5-V, 1.8-V, 2.0-V, 2.5-V, 2.8-V, 2.85-V, 2.9-V, 3.0-V, 3.3-V, 5.0-V, or Adjustable Output Voltage Options D Other Output Voltages Available by Special Order
APPLICATIONS
D Cellular Phones D Laptop and Palm Computers D PDA, Digital Still Cameras
DESCRIPTION
The Si9182 is a 250-mA CMOS LDO (low dropout) voltage regulator. The device features ultra low ground current and dropout voltage to prolong battery life in portable electronics. The Si9182 offers line/load transient response and ripple rejection superior to that of bipolar or BiCMOS LDO regulators. The device is designed to maintain regulation while delivering 500-mA peak current. This is useful for systems that have high surge current upon turn-on. The Si9182 is designed to drive the lower cost ceramic, as well as tantalum, output capacitors. The device is guaranteed stable from maximum load current down to 0-mA load. In addition, an external noise bypass capacitor connected to the device’s CNOISE pin will lower the LDO’s output noise for low noise applications. The Si9182 also includes an out-of-regulation error flag. When the output voltage is 5% below its nominal output voltage, the error flag output goes low. If a capacitor is connected to the device’s delay pin, the error flag output pin will generate a delayed power-on-reset signal. The Si9182 is available in both standard and lead (Pb)-free MSOP-8 packages and is specified to operate over the industrial temperature range of −40 _C to 85 _C.
TYPICAL APPLICATIONS CIRCUITS
1 2 3 VIN 2.2 mF GND 4 CNOISE DELAY GND VIN SD ERROR SENSE/ADJ VOUT 8 7 6 5 2.2 mF VOUT VIN 2.2 mF GND 1 2 3 4 CNOISE DELAY GND VIN SD ERROR SENSE/ADJ VOUT 8 7 6 5 VOUT 2.2 mF
Si9182 FIGURE 1. Fixed Output
Si9182 FIGURE 2. Adjustable Output
1 0.1 mF 2 0.1 mF 3 4
CNOISE DELAY GND VIN
SD ERROR
8 7 6 5 2.2 mF 1 MW
ON/OFF POR VOUT
SENSE/ADJ VOUT
VIN 2.2 mF GND
Si9182
FIGURE 3. Low Noise, Full Features Application
Document Number: 71150 S-41221—Rev. F, 28-Jun-04 www.vishay.com
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Si9182
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V SD Input Voltage, VSD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to VIN Output Current, IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . Short Circuit Protected Output Voltage, VOUT . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to VO(nom) + 0.3 V Maximum Junction Temperature, TJ(max) . . . . . . . . . . . . . . . . . . . . . . . 150_C Storage Temperature, TSTG . . . . . . . . . . . . . . . . . . . . . . . . . . −55_C to 150_C ESD (Human Body Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV Power Dissipation (Package)a 8-Pin MSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 666 mW Thermal Impedance (QJA) 8-Pin MSOPb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C/W Notes a. Device mounted with all leads soldered or welded to PC board. b. Derate 6.6 mW/_C above TA = 25_C
Stresses beyond 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 beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE
Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 V to 6 V Output Voltage, VOUT (Adjustable Version) . . . . . . . . . . . . . . . . . . 1.5 V to 5 V SD Input Voltage, VSD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to VIN CIN = 2.2 mF, COUT = 2.2 mF (ceramic, X5R or X7R type) , CNOISE = 0.1 mF (ceramic) COUT Range = 1 mF to 10 mF ("10%, x5R or x7R type) CIN w COUT Operating Ambient Temperature, TA . . . . . . . . . . . . . . . . . . . . −40_C to 85_C Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . −40_C to 125_C
SPECIFICATIONS
Test Conditions Unless Otherwise Specified Parameter
Output Voltage Range Output Voltage Accuracy (Fixed Versions) Feedback Voltage (ADJ Version) Line Regulation (Except 5-V Version) Line Regulation (5-V Version) Line Regulation (ADJ Version) VIN DVOUT 100 VOUT(nom) VOUT
Limits
−40 to 85_C
Symbol
VIN = VOUT(nom).