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EUP7182 50mA Low-Noise Ultra Low-Dropout CMOS Regulator with Fault Indicator
DESCRIPTION
The EUP7182 low-noise, low-dropout, linear regulator operates from a 2.5V to 5.5V input and is guaranteed to deliver 50mA. The EUP7182 is stable with small 1F ceramic capacitor. Its performance suits battery powered applications because of its shutdown mode (60 nA typ), low quiescent current (110A typ), and LDO voltage (110mV typ). The low dropout voltage allows for more utilization of a battery's available energy by operating closer to its end-of-life voltage. An output fault-detection circuit indicates loss of regulation. The EUP7182 is available in SOT23-6 package with 1.8V, 2.5v, 2.8V, 3V and 3.3V versions.
FEATURE
2.5V to 5.5V Input Range 50mA Guaranteed Output Current 60dB PSRR at 1kHz 50V RMS Output Voltage Noise (10Hz to 100kHz) 110mV Dropout at 50mA Low 110A No-Load Supply Current 1A Shutdown Current Fast Start-up Time Stable With 1F Ceramic Output Capacitors Thermal Shutdown and Short-Circuit Protection Fault Indicator RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
Wireless Handsets Battery Powered Electronics Portable Information Appliances
Block Diagram
Figure1.
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Typical Application Circuit
Figure2. Fixed Voltage LDO Regulator
Pin Configurations
Package Type Pin Configurations
SOT23-6
Pin Description
PIN PIN DESCRIPTION
VIN GND
1 2
Input voltage of the LDO Common Ground
SHDN FAULT CC VOUT
3 4 5 6
SHDN places the entire device in shutdown mode when held low. Fault output. A high-impedance, open-drain output. If the circuit is out of regulation, FAULT goes low. In shutdown, this pin is high Impedance. Connect to GND if unused Compensation capacitor for noise reduction Output voltage of the LDO
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Ordering Information
Order Number
EUP7182-18VIR1 EUP7182-25VIR1 EUP7182-28VIR1 EUP7182-30VIR1 EUP7182-33VIR1
Package Type
SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6
Marking mDxxxx mBxxxx mExxxx mGxxxx mHxxxx
Operating Temperature range
-40C to 85C -40C to 85C -40C to 85C -40C to 85C -40C to 85C
EUP7182 1/4
1/4
1/4
1/4
1/4
1/4
Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard C: Commercial Package Type V: SOT23 Output Voltage 18: 1.8V 25: 2.5V 28: 2.8V 30: 3.0V 33: 3.3V
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Absolute Maximum Ratings
VIN, VOUT, V SHDN , VCC, V FAULT ------------------------------------------------------------ -0.3V to 6V Fault Sink Current --------------------------------------------------------------------------------20mA Storage Temperature Range ------------------------------------------------------------- -65C to 160C Junction Temperature (TJ) -----------------------------------------------------------------------150C Lead Temperature (10 sec.) ------------------------------------------------------------------------260C
Electrical Characteristics
Unless otherwise specified, all limits guaranteed for VIN= VO +0.5V, VSHDN=VIN, CIN=COUT=1F, CCC=10nF, TJ =25C. (Boldface limits apply for the operating temperature extremes: -40C and 85C)
Symbol
VIN VO IO ILIMIT IQ VDO VO en
VSHDN ISHDN
Parameter
Input Voltage Output Voltage Tolerance Maximum Output Current Output Current Limit Supply Current Shutdown Supply Current Dropout Voltage Line Regulation Load Regulation Output Voltage Noise
SHDN Input Threshold SHDN Input Bias Current FAULT Detection Voltage of the VIN-to-VOUT Difference (Apply for VOUT 2.5V and IOUT 15mA) FAULT Detection Threshold of the Output Voltgae FAULT Output Low Voltage
Conditions
100A IOUT 50mA VIN=VO+0.5V, Average DC Current Rating IOUT=0mA VO =0V, SHDN =GND IOUT =1mA IOUT =50mA IOUT = 1mA, (VO +0.5V) VI 5.5V 100A IOUT 50mA IOUT =10mA, 10Hz f 100kHz VIH,(VO+0.5V) VI 5.5V VIL,(VO+0.5V) VI 5.5V
SHDN =GND or IN
Min
2.5 -2 -3 50
EUP7182 Typ Max.
5.5 +2 +3 100 100 200 1 160 0.1
Unit
V % of VOUT(NOM) mA mA A A mV %/V %/mA VRMS V nA mV
75 110 0.06 1 110
-0.1
0.05 0.002 50
2
0.4
0.1 25
100
IOUT =10mA
40
V FAULT
0.8x VOUT ISINK=2mA
FAULT =3.6V, SHDN =0V
V
0.25
0.13 0.1 160 20
V nA C s
I FAULT FAULT Off-Leakage Current TSD Thermal Shutdown Temperature
100
Thermal Shutdown Hysteresis TON Start-Up Time VO at 90% of Final Value
80
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Application Information
External Capacitors Like any low-dropout regulator, the EUP7182 requires external capacitors for regulator stability. The EUP7182 is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance. Input Capacitor Noise Bypass Capacitor Connecting a 33nF capacitor between the CBYPASS pin and ground significantly reduces noise on the regulator output. This cap is connected directly to a high impedance node in the bandgap reference circuit. Any significant loading on this node will cause a change on the regulated output voltage. For this reason, DC leakage current through this pin must be kept as low as possible for best output voltage accuracy. The types of capacitors best suited for the noise bypass capacitor are ceramic and film. Unlike many other LDO's , addition of a noise reduction capacitor does not effect the load transient response of the device. However, it does affect start-up time. The smaller the capacitance value, the quicker the start-up time. Power Dissipation and Junction Temperature
A minimum input capacitance of 1F is required between the EUP7182 input pin and ground (the amount of the capacitance may be increased without limit).This capacitor must be located a distance of not more than 1cm from the input pin and returned to a clean analog ground. 1F ceramic capacitor are fine for most end use applications. If a tantalum capacitor is used at the input, it must be guaranteed by the manufacturer to have a surge current rating sufficient for the application.
No-Load Stability
The EUP7182 will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications.
Output Capacitance
The EUP7182 is specifically designed to employ ceramic output capacitors as low as 2.2F. Ceramic capacitors below 10F offer significant cost and space savings, along with high frequency noise filtering. Higher values and other types and of capacitor may be used, but their equivalent series resistance (ESR) should be maintained below 0.5. Ceramic capacitor of the value required by the EUP7182 are available in the following dielectric types: Z5U, Y5V, X5R, and X7R. The Z5U and Y5V types exhibit a 50% or more drop in capacitance value as their temperature increase from 25C, an important consideration. The X5R generally maintain their capacitance value within 20%. The X7R type are desirable for their tighter tolerance of 10% over temperature.
Specified regulator operation is assured to a junction temperature of 125C; the maximum junction temperature should be restricted to 125C under normal operating conditions. This restriction limits the power dissipation the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or equal to PD(max) The maximum-power-dissipation limit is determined using the following equation:
P
T max - T A =J D(max) R
JA
Where: TJmax is the maximum allowable junction temperature. RJA is the thermal resistance junction-to-ambient for the package TA is the ambient temperature. The regulator dissipation is calculated using:
PD=(VI-VO) x IO
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the thermal protection circuit.
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Fault Detection
The EUP7182 provides a FAULT pin that goes low during out of regulation conditions like current limit and thermal shutdown, or when it approaches dropout. The latter monitors the input-to-output voltage differential and compares it against a threshold that is slightly above the dropout voltage. This threshold also tracks the dropout voltage as it varies with load current. Refer to Fault Detect vs. Load Current curve in the typical characteristics section. The FAULT pin requires a pull-up resistor since it is an open-drain output. This resistor should be large in value to reduce energy drain. A100k pull-up resistor works well for most applications.
Shutdown
The EUP7182 goes into sleep mode when the SHDN pin is in a logic low condition. During this condition, the pass transistor, error amplifier, and bandgap are turned off, reducing the supply current to 60nA typical. The SHDN pin may be directly tied to VIN to keep the part on.
Fast Start-up
The EUP7182 provides fast start-up time for better system efficiency. The start-up speed is maintained when using the optional noise bypass capacitor.
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Packaging Information
SOT23-6
SYMBOLS A A1 b D E1 e E L
MILLIMETERS MIN. MAX. 1.45 0.00 0.15 0.30 0.50 2.90 1.60 0.95 2.60 3.00 0.30 0.60
INCHES MIN. 0.000 0.012 0.114 0.063 0.037 0.102 0.012 0.118 0.024 MAX. 0.057 0.006 0.020
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