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EUP7982 300mA Low-Noise Ultra Low-Dropout CMOS Regulator with Fault Indicator
FEATURE DESCRIPTION
The EUP7982 low-noise, low-dropout, linear regulator operates from a 2.5V to 5.5V input and is guaranteed to deliver 300mA. The EUP7982 is stable with small 2.2F ceramic capacitor. Its performance suits battery powered applications because of its shutdown mode (60 nA typ), low quiescent current (110A typ), and LDO voltage (140mV 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 EUP7982 is available in MSOP package with 1.8V, 2.5v, 2.8V, 3V, 3.3V, and adjustable versions. 2.5V to 5.5V Input Range 300mA Guaranteed Output Current 60dB PSRR at 1kHz 50V RMS Output Voltage Noise (10Hz to 100kHz) 140mV Dropout at 300mA Low 110A No-Load Supply Current 1A Shutdown Current Fast Start-up Time Stable With 2.2F Ceramic Output Capacitors Thermal Shutdown and Short-Circuit Protection Fault Indicator RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
Wireless Handsets DSP Core Power Battery Powered Electronics Portable Information Appliances
Block Diagram
Figure1.
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Typical Application Circuit
Figure2. Fixed Voltage LDO Regulator
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Pin Configurations
Part Number Pin Configurations
EUP7982 MSOP-8
Pin Description
PIN PIN DESCRIPTION
OUT IN GND SET CC
1,4 2 3 5 6
Output voltage of the LDO Input voltage of the LDO Common Ground Output voltage set. Not externally connected for the fixed versions. Connect ot resistor-divider for adjustable output voltage. Compensation capacitor for noise reduction
SHDN FAULT
7 8
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
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Ordering Information
Order Number
EUP7982MIR1 EUP7982MIR0 EUP7982-18MIR1 EUP7982-18MIR0 EUP7982-25MIR1 EUP7982-25MIR0 EUP7982-28MIR1 EUP7982-28MIR0 EUP7982-30MIR1 EUP7982-30MIR0 EUP7982-33MIR1 EUP7982-33MIR0
Package Type
MSOP-8 MSOP-8 MSOP-8 MSOP-8 MSOP-8 MSOP-8
Marking CA 1/4 1/4 P7982 C1 1/4 1/4 P7982 C2 1/4 1/4 P7982 C6 1/4 1/4 P7982 C5 1/4 1/4 P7982 C3 1/4 1/4 P7982
Operating Temperature range
-40C to 85C -40C to 85C -40C to 85C -40C to 85C -40C to 85C -40C to 85C
EUP7982 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 M: MSOP Output Voltage 18: 1.8V 25: 2.5V 28: 2.8V 30: 3.0V 33: 3.3V Blank: Adjustable
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Absolute Maximum Ratings
VIN, VOUT, V SHDN , VSET , 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=2.2F, CCC=22nF, TJ =25C. (Boldface limits apply for the operating temperature extremes: -40C and 85C)
Symbol
VIN VO VO IO ILIMIT IQ
Parameter
Input Voltage Output Voltage Tolerance Output Adjust Range Maximum Output Current Output Current Limit Supply Current Shutdown Supply Current
Conditions
100A IOUT 300mA VIN=VO+0.5V, SET= OUT for the Adjust Versions Adjust Version Only Average DC Current Rating IOUT=0mA IOUT=300mA VO =0V, SHDN =GND IOUT =1mA IOUT =200mA IOUT =300mA IOUT = 1mA, (VO +0.5V) VI 5.5V 100A IOUT 300mA IOUT =10mA, 10Hz f 100kHz VIH,(VO+0.5V) VI 5.5V VIL,(VO+0.5V) VI 5.5V
SHDN =GND or IN
EUP7982 Min Typ Max.
2.5 -2 -3 1.25 300 5.5 +2 +3 5.5
Unit
V % of VOUT(NOM) V mA mA A A mV %/V %/mA VRMS V nA nA mV V nA C s
600 110 240 0.06 0.4 90 140
-0.1
200
1
200
VDO
Dropout Voltage Line Regulation Load Regulation
VO en
VSHDN ISHDN ISET V FAULT
0.05 0.002 50
0.1
Output Voltage Noise
SHDN Input Threshold SHDN Input Bias Current
2
0.4
0.1 0.1 150 0.13 0.1 160 20
100 2.5
280 0.25
SET Input Leakage
FAULT Detection Voltage FAULT Output Low Voltage
SET = 1.3V, Adjust Version Only VO 2.5V, IOUT =200mA ISINK=2mA
FAULT =3.6V, SHDN =0V
I FAULT FAULT Off-Leakage Current TSD Thermal Shutdown Temperature
100
Thermal Shutdown Hysteresis TON Start-Up Time COUT =10F, VO at 90% of Final Value
80
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Typical Operating Characteristics
Unless otherwise specified, VIN = VO + 0.5V, CIN=COUT = 2.2 F, CCC= 22 nF, TJ= 25C, VSHDN=VIN
Output Voltage Change vs Temperature
0.2
Dropout Voltage v s. Load Current
160 Dropout Voltage(m V) 140 120 100 80 0 6 40 20 0
20 50 0 10 0 14 0 12 0 -4 0 -2 0
0.0
Vout Change (%)
-0.2 -0.4 -0.6 -0.8
-5 5
Tj= -40 Tj=25 Tj=85
T emperature
0
50
100
150
200
250
300
Load Current(mA)
FAULT Dectect Threshold s Load Current v 200 FAULT Detect Threshold(mV) 175 150 125 100 75 50 25 0 0 50 100 150 200 Load Current(mA) 250 300
Supply Current v s. Input Voltage(SOT25)
175 Supply Current(uA) 150 125 100 75 50 25 0 2.6 3 3.4 3.8 4.2 4.6 5 5.4 5.8
Input Voltage(V) TA= 25 TA= 85 Tj=-40
Supply Current s Load Current v 300 250 Supply Current uA) ( 200 150 100 50 0 0 50 100 150 200 Load Current(mA) 250 300 Tj=25 Tj=85 TJ=-40
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Output Noise (10kHz to 100kHz) Line Transient Response
Load Transient
Shutdown Response
Power-up Response
Power-down Response
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Application Information
External Capacitors Like any low-dropout regulator, the EUP7982 requires external capacitors for regulator stability. The EUP7982 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 EUP7982 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 EUP7982 will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications.
Output Capacitance
The EUP7982 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 EUP7982 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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Adjustable Operation
The adjustable version of the EUP7982 has an output voltage range of 1.25V to 6V. The output voltage of the EUP7982 adjustable regulator is programmed using an external resistor divider as shown in Figure3. The output voltage is calculated using: R V = V x (1 + 1 ) O ref R
2
Where: Vref=1.23V typ. (the internal reference voltage) Utilize the following equation for adjusting the output to a particular voltage: V PI = R 2 O - 1 1.23V Choose R2=100k to optimize accuracy, power supply rejection, noise and power consumption. In order to improve the stability of the adjustable version, it is suggested that a small compensation capacitor C1 be placed between OUT and SET
Fault Detection The EUP7982 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 EUP7982 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 EUP7982 provides fast start-up time for better system efficiency. The start-up speed is maintained when using the optional noise bypass capacitor.
Figure3. Adjustable LDO Regulator Programming
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Packaging Information
MSOP-8
NOTE 1. Package body sizes exclude mold flash and gate burrs 2. Dimension L is measured in gage plane 3. Tolerance 0.10mm unless otherwise specified 4. Controlling dimension is millimeter. Converted inch dimensions are not necessarily exact.
SYMBOLS A A1 A2 b C D E E1 e L y c
DIMENSIONS IN MILLIMETERS MIN. NOM. MAX. 0.81 0.95 1.10 0.05 0.09 0.15 0.76 0.86 0.97 0.28 0.30 0.38 0.13 0.15 0.23 2.90 3.00 3.10 4.70 4.90 5.10 2.90 3.00 3.10 -----0.65 ----0.40 0.53 0.66 ----------0.10 0 -----6
DIMENSIONS IN INCHES MIN. NOM. MAX. 0.032 0.0375 0.043 0.002 0.004 0.006 0.030 0.034 0.038 0.011 0.012 0.015 0.005 0.006 0.009 0.114 0.118 0.122 0.185 0.193 0.201 0.114 0.118 0.122 -----0.026 -----0.016 0.021 0.026 ----------0.004 0 -----6
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