UTCL2949E LINEAR INTEGRATED CIRCUIT
MULTIFUNCTION VERY LOW DROP VOLTAGE REGULATOR
DESCRIPTION
The UTC L2949E is a monolithic integrated 5V voltage regulator with a very low dropout output and additonal functions as power-on reset and input voltage sense.It is designed for supplying the microcomputer controlled systems especially in automotive applications.
FEATURES
*Operating dc supply voltage range 5V to 28V. *Transient supply voltage up to 40V. *Extremely low quiescent current in standby mode. *High precision standby output voltage 5V±1% *Output current capability up to 100mA. *Very low dropout voltage less than 0.5V. *Reset circuit sensing the output voltage *Programmable reset pulse delay with external capacitor *Voltage sense comparator. *Thermal shutdown and short circuit protections.
PIN CONNECTIONS
DIP-8 SOP-8 SOP-20
VS 1 SI 2 Vz 3 CT 4
8 VOUT 7 SO 6 RES 5 GND
DIP-8/SOP-8
Vz CT N.C. GND GND GND GND N.C. N.C. RES
1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11
SOP-20
SI VS N.C. GND GND GND GND N.C. VOUT SO
UTC UNISONIC TECHNOLOGIES CO. LTD
1
QW-R102-014,A
UTC L2949E
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
Vz VOUT
CT
VS PREREGULATOR 5V
2μ +
REG SI
RESET VS
2V
REF
1.23V
SENSE
1.23V
RES
SO GND
ABSOLUTE MAXIMUM RATINGS
PARAMETER DC Operating Supply Voltage Transient Supply Voltage(T<1s) Output Current Output Voltage Output Voltage
Reset Output Sense Output Output Current Reset Output Sense Output Preregulator Output Voltage Preregulator Output Current Junction Temperature Storage Temperature Range
SYMBOL VCC
VCC TR Io Vo
VRES Vso
IRES Iso Vz Iz Tj Tstg
RATING 28 40
Internally Limited 20
20 20
5 5 7 5 -40~+150 -55~+150
UNIT V V
V
V
mA
V mA ℃ ℃
UTC UNISONIC TECHNOLOGIES CO. LTD
2
QW-R102-014,A
UTCL2949E LINEAR INTEGRATED CIRCUIT
THERMAL DATA
DESCRIPTION
Thermal Resistance Junction-ambient DIP-8 SOP-8 SOP-20
Thermal Resistance Junction-pin (SOP-20)
Thermal Shutdown Junction temperature
SYMBOL
Rth j-amb
Rth j-pins TJSD
RATING
100 200 50 15 165
UNIT
℃/W
℃/W ℃
ELECTRICAL CHARACTERISTICS(Vs=14V;-40℃