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500mA CMOS LDO Regulator
Description
The CYT6118 is an efficient linear voltage regulator. It has extra low dropout voltage. At light loads the typical dropout voltage is 4.6mV, at full load the typical dropout voltage is 300mV. The output voltage accuracy is better than 2%. The CYT6118 has low ground current, so it can help prolong battery life. The CYT6118 is specially designed for hand-held, battery-powered devices.
CYT6118
Features
Typical 90mV dropout voltage at 150mA. Guaranteed 500mA output over the full operating temperature range. Low 300mV typical dropout voltage at full load. Extremely tight load and line regulation. Low temperature coefficient. Current and thermal limiting. No-load stability. Standard SOT-89-3 package.
Pin Configuration
Top view
Applications
Active SCSI terminators. Post regulators for switching supplies. Battery chargers.
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High-efficiency linear power supplies. Computer motherboard, display, graphic card DC/DC converter, such as 5V to 3.3V, 3.3V to 2.8V or 3.3V to 2.5V.
SOT-89
Typical Application
Ordering Information
CYT6118 _ _ _
5V
Vin
C0 C=10u
M0
Vout
C1 C=10u
3.3V
R2 rload
PIN (1=>3): 1. G: OUT/GND/IN Package Type: 1. K: SOT-89-3L Output Voltage: 1. A: VOUT = 3.3V 2. B: VOUT = 2.8V 3. C: VOUT = 2.5V 4. D: VOUT = 1.8V 5. E: VOUT = 1.5V
gnd
Control Logic
gnd
1.25V Ref
Over Current Protection gnd
Thermal Protection
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500mA CMOS LDO Regulator
Absolute Maximum Ratings(1)
Supply Input Voltage (VIN) ............... -0.7V to +7V Power Dissipation (PD) ............. Internally Limited Junction Temperature (TJ) ............ 0C to +125C Lead Temperature (soldering, 5 sec.) ........ 260C Storage Temperature (TS) .......... -10C to +150C
(3)
CYT6118
Operating Ratings(2)
Supply Input Voltage (VIN) ............... +2.5V to +6V Junction Temperature (TJ) ............ 0C to +125C Package Thermal Resistance .......................................120C /W
Electrical Characteristics
VIN = VOUT + 1.0V; COUT = 4.7F, IOUT = 10mA; TJ = 25C;unless otherwise specified. Symbol Parameter Output Voltage Accuracy Output Voltage Temperature Coefficient Line Regulation Load Regulation
(5)
Conditions CYT6118-1.5V CYT6118-1.8V CYT6118-2.5V CYT6118-2.8V CYT6118-3.3V Note 4 VIN = VOUT + 1V to 5.5V IOUT =10mA to 500mA IOUT =10mA
(5)
Min 1.470 1.764 2.450 2.744 3.234 ---------------
Typ 1.5 1.8 2.5 2.8 3.3 40 0.3 0.5 9 175 530 4.6 90 300 150 30 35 1 1.5
Max 1.530 1.836 2.550 2.856 3.366 ---------------
Units
VOUT
V
VOUT /T VOUT / VOUT VOUT / VOUT
ppm/ % %
VOUT<2V VIN - VOUT Dropout Voltage(6) VOUT>2V
IOUT =150mA IOUT =500mA IOUT =10mA IOUT =150mA IOUT =500mA
mV
mV
TPROTECTION PSRR IGROUND ILIMIT
Thermal Protection Ripple Rejection Ground Current Current Limit
Thermal Protection Temperature Protection Hysterisys f =120Hz IOUT=10mA VOUT =0V
C C dB mA A
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500mA CMOS LDO Regulator
Note 1: Exceeding the absolute maximum rating may damage the device. Note 2: The device is not guaranteed to function outside its operating rating.
CYT6118
Note 3: The maximum allowable power dissipation at any TA (ambient temperature) is calculated using: PD(MAX) = (TJ(MAX) - TA)/JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. See Table 1 and the "Thermal Considerations" section for details. Note 4: Output voltage temperature coefficient is the worst-case voltage change divided by the total temperature range. Note 5: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 100A to 500mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Note 6: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential.
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500mA CMOS LDO Regulator
Application Hints
Like any Low dropout regulator, CYT6118 requires external capacitors to ensure stability. The external capacitors must be carefully selected to ensure the performances.
CYT6118
Thermal Consideration
It is important that the thermal limit of the package should not be exceeded. The CYT6118 has built-in thermal protection. When the thermal limit is exceeded, the IC will enter protection, and the VOUT will be reset to zero. The power dissipation for a given application can be calculated as follows: The Power Dissipation (PD) is PD = IOUT * [VIN - VOUT] The thermal limit of the package is then limited to PD(MAX) = [TJ - TA]/JA where TJ is the junction temperature, TA is ambient temperature, and JA is around 120C/W for CYT6118. CYT6118 is designed to enter thermal protection at 150C. For example, if TA is 25C then the max PD is limited to about 1W. In other words, if IOUT(MAX) = 500mA, then [VIN - VOUT] can not exceed 2.1V.
Input Capacitor: An Input Capacitor of at least 10uF is required. Ceramic or Tantalum can be used. The value can be increased without upper limit.
Output Capacitor: An Output Capacitor is required for look stability. It must be located no more than 1cm away from the VOUT pin, and connected directly between VOUT and GND pins. The minimum value is 10uF but once again its value can be increased without limit.
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500mA CMOS LDO Regulator
Typical Performance Characteristics
(VIN = 5V, CIN = 1F, COUT = 10F, TA=25C, unless otherwise noted.)
Load Regulation 3.5 3
CYT6118
Output Voltage vs Temperature 3.5 3
Output Voltage (V)
1.5V 1.8V 2.5V 3.3V
Output Voltage
2.5 2 1.5 1 0 100 200 300 400 500 600 Output Current (mA)
2.5 2 1.5 1 0 50 100 150 Temperature (C)
1.5V 1.8V 2.5V 3.3V
Quiescent Current vs Temperature (Output Voltage @ 2.5V)
0.6
Dropout Voltage vs Output Current
1.17 1.16 1.15 1.14 1.13 1.12 1.11 1.1 1.09 1.08 1.07 1.06 0 20 40 60 80 100 120 140 Temperature (C)
0.5
Dropout Voltage (V)
Quiescent Current (mA)
0.4 0.3 0.2 0.1 0 0 100 200 300 400 500 600 Output Current (mA)
1.5V 1.8V 2.5V 3.3V
Line Transient
Load Transient (10mA - 500mA)
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500mA CMOS LDO Regulator
Outline Drawing for SOT-89
DIM
SOT-89
A C D K L M J
CYT6118
N
DIMENSIONS INCHES MM MIN MAX MIN MAX
0.173 0.181 0.159 0.167 0.067 0.075 0.051 0.059 0.094 0.102 0.035 0.047 0.118REF 0.059REF 0.016 0.020 0.055 0.063 0.014 0.016 10TYP 0.028REF 4.400 4.600 4.050 4.250 1.700 1.900 1.300 1.500 2.400 2.600 0.890 1.200 3.00REF 1.50REF 0.400 0.520 1.400 1.600 0.350 0.410 10TYP 0.70REF
H
G I
A B C D E F G H I J K L M
B
F
E
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