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MIC5232
10mA Ultra-Low Quiescent Current Cap LDO
General Description
The MIC5232 is an ultra-low quiescent current, lowdropout linear regulator that is capable of operating from a single-cell lithium ion battery. Consuming only 1.8A of quiescent current while operating, the MIC5232 is ideal for stand-by applications like powering real-time clocks or memory in battery operated electronics. The MIC5232 is capable of providing 10mA of output current and has low output noise, providing a small, efficient solution ideal for any keep-alive application. Including reverse current protection, keeping reverse leakage (VOUT > VIN) down to 20nA. The MIC5232 is a Cap design, operating with very small ceramic output capacitors for stability, reducing required board space and component cost. The MIC5232 is available in fixed output voltages in the miniature 6-pin 2mm x 2mm MLF(R) package and thin SOT-23-5 package with an operating junction temperature range of -40C to 125C.
Features
* * * * * * Input voltage range: 2.7V to 7.0V Ultra-low Iq: Only 1.8A operating current Stable with 0.47F ceramic output capacitor Low dropout voltage of 100mV @ 10mA Reverse Battery Protection High output accuracy: - +2.0% initial accuracy - +3.0% over temperature Logic-Level Enable Input Miniature 6-pin 2mm x 2mm MLF(R) package Lead-Free Thin SOT-23-5 Package Tight Load and Line Regulation
* * * *
Applications
* * * * Real-Time Clock Power Supply Stand-by Power Supply SRAM Memory Back-up Supply Cellular Telephones and Notebook Computers
Typical Application
MIC5232-1.2YD5
VIN 3.6V 1F
3.0 2.7 2.4 2.1 1.8 1.5 1.2 0.9 0.6 0.3 VOUT = 1.2V IOUT = 100A COUT = 0.47F
Ground Pin Current vs. Input Voltage
VIN EN
VOUT
VOUT 1.2V 0.47F ceramic
GND
0 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 INPUT VOLTAGE (V)
1.5 Real-Time Clock Back-up Supply
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
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MIC5232
Block Diagram
Ordering Information
Part Number MIC5232-1.2YD5 MIC5232-3.3YD5 MIC5232-1.2YML MIC5232-3.3YML
Note: 1. Other voltages available. Contact Micrel Inc. for more details.
Voltage 1.2V 3.3V 1.2V 3.3V
(1)
Junction Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package TSOT-23-5 TSOT-23-5 6-Pin 2mm x 2mm MLF 6-Pin 2mm x 2mm MLF
(R) (R)
Lead Finish Pb-Free Pb-Free Pb-Free Pb-Free
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MIC5232
Pin Configuration
EN GND VIN 1 2 3
EN 1 GND 2
6 5 EP 4
NC NC VOUT
4 NC
5 VOUT
VIN 3
MIC5232-x.xYD5 TSOT-23-5 (D5)
MIC5232-x.xYML 2mm x 2mm MLFTM (ML)
Pin Description
Pin Number TSOT-23-5 1 2 3 4 5 Pin Number MLF 3 2 1 5 4 6 EP Pin Name VIN GND EN NC VOUT NC EP Pin Name Supply Input. Ground. Enable Input. Active High. High = on, Low = off. Do not leave floating. Not Internally Connected. Output (10mA output current). Not Internally Connected. Exposed pad connected-to-ground.
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MIC5232
Absolute Maximum Ratings(1)
Supply Input Voltage (VIN) ................................0V to 8V Enable Input Voltage (VEN)...............................0V to 8V Power Dissipation (PD) .................... Internally Limited(3) Junction Temperature (TJ).................. -40C to +125C Storage Temperature (TS) .................. -65C to +150C Lead Temperature (soldering, 5 sec.) ................. 260C ESD Rating(4) ......................................................... 2kV
Operating Ratings(2)
Supply voltage (VIN) ...................................... 2.7V to 7V Enable Input voltage (VEN) ...............................0V to VIN Thermal Resistance TSOT-23-5 (JA)......................................... 235C/W MLF-6 (JA) .................................................. 90C/W
Electrical Characteristics(5)
VIN = VOUT + 1.0V, COUT = 0.47F, IOUT = 100A, TJ = 25C, bold values indicate -40C to +125C, unless noted.
Parameter Output Voltage Accuracy Output Voltage Temp. Coefficient Line Regulation Load Regulation Dropout Voltage
(6)
Conditions Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C
Min -2.0 -3.0
Typ
Max +2.0 +3.0
40 VIN = VOUT +1V to7V; IOUT = 10A to 10mA IOUT = 100A IOUT = 10mA IOUT = 10A VEN < 0.18V VOUT = 0V VOUT = VIN + 1V f = 10Hz f = 1kHz COUT =0.47F; 10Hz to 100kHz Logic Low (Regulator Shutdown) Logic High (Regulator Enabled) VIL < 0.18V (Regulator Shutdown) VIH > 1.4V (Regulator Enabled) (7) COUT = 0.47F 0.02 0.2 60 100 1.8 0.1 70 0.02 55 35 400 0.25 1.0 1.5 300 3 1.5 120 1
Units % % ppm/C %/V % % mV mV A A mA A dB dB Vrms V V nA nA ms
Ground Pin Current Ground Pin Current in Shutdown Current Limit Reverse Current (VOUT > VIN) Ripple Rejection Output Voltage Noise Enable Input Enable Input Voltage Enable Input Current Turn-on Time
Notes:
0.18 1.4 1 1 0.75
1.5
1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = TJ(max) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature. 4. Devices are ESD sensitive. Handling precautions recommended. 5. Specification for packaged product only. 6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. For outputs below 2.7V, dropout voltage is the input-to-output differential with the minimum input voltage 2.7V. 7. Turn-on time is measured from 10% of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.
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Typical Characteristics
80 70 60 50 dB 40 30 20 VOUT = 3.3V VIN = VOUT + 1V 10 IOUT = 100A COUT = 0.47F 0 0.01 0.1 1 10 100 FREQUENCY (kHz)
Power Supply Rejection Ratio
DROPOUT VOLTAGE (mV)
120 100 80 60 40 20
Dropout Voltage vs. Output Current
DROPOUT VOLTAGE (mV)
90 80 70 60 50 40 30 20 10 0
Dropout Voltage vs. Temperature
1000
0 0 1 2 3 4 5 6 7 8 9 10 OUTPUT CURRENT (mA)
VOUT = 3.3V COUT = 0.47F
VOUT = 3.3V IOUT = 100A COUT = 0.47F 100 120 TEMPERATURE (C)
160 DROPOUT VOLTAGE (mV) 140 120 100 80 60 40 20 0
Dropout Voltage vs. Temperature
1.4 1.2 1
Output Voltage vs. Input Voltage
3.5 3.4 3.3 3.2 3.1 3 2.9
Output Voltage vs. Temperature
0.8 100A 0.6 0.4 VOUT = 3.3V IOUT = 10mA COUT = 0.47F 100 120 TEMPERATURE (C) 0.2 0 0 1 10mA VOUT = 1.2V COUT = 0.47F 2 3 4 5 6 INPUT VOLTAGE (V) 7
2.8 2.7 2.6 2.5 VOUT = 3.3V VIN = VOUT + 1V COUT = 0.47F 100 120 TEMPERATURE (C)
14 12 10 8 6 4 2
Ground Pin Current vs. Output Current
3.0 2.7 2.4 2.1 1.8 1.5 1.2 0.9 0.6 0.3
Ground Pin Current vs. Input Voltage
14 12 10 8 6 4
Ground Pin Current vs. Input Voltage
0 0 1 2 3 4 5 6 7 8 9 10 OUTPUT CURRENT (mA)
VOUT = 3.3V VIN = VOUT + 1V COUT = 0.47F
0 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 INPUT VOLTAGE (V)
VOUT = 1.2V IOUT = 100A COUT = 0.47F
2
0 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 INPUT VOLTAGE (V)
VOUT = 1.2V IOUT = 10mA COUT = 0.47F
20 GROUND CURRENT (A) 18 16 14 12 10 8 6 4 2 0
Ground Pin Current vs. Temperature
100 80 60 40
Current Limit vs. Input Voltage
ENABLE THRESHOLD (V)
1 0.8 0.6 0.4 0.2 0
Enable-On Threshold vs. Temperature
VOUT = 3.3V VIN = VOUT + 1V IOUT = 10mA COUT = 0.47F 100 120 TEMPERATURE (C)
20
0 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 INPUT VOLTAGE (V)
VOUT = 3.3V COUT = 0.47F
VOUT = 3.3V VIN = 4.3V COUT = 0.47F 100 120 TEMPERATURE (C)
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Typical Characteristics (continued)
Turn-On Time
1400 SHORT CUIRCUIT (mA) 1200 1000 800 600 400 VOUT = 1.2V VIN = 2.7V 200 COUT = 0.47F IOUT = 100A 0 90 80 70 60 50 40 30 20 10 0 VOUT = 0V VIN = 4.3V COUT = 0.47F 100 120 TEMPERATURE (C)
Short Circuit Current vs. Temperature
100 REVERSE CURRENT (nA) (VOUT CURRENT) 90 80 70 60 50 40 30 20 10
Reverse Leakage Current (V OUT > VIN)
100 120 TEMPERATURE (C)
0 2.5
VIN = 2.7V COUT = 0.47F 3 3.5 4 4.5 5 5.5 OUTPUT VOLTAGE (V)
1E+02
Output Noise Spectral Density
1E+01
1E-00 1E-01 VOUT = 1.2V VIN = 4.3V ROUT COUT = 0.47F 1E-02 0.1 100 FREQUENCY (kHz)
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Functional Characteristics
Enable Turn-On Transient Load Transient Response
Enable Voltage (2V/div)
0V
Output Current (5mA/div)
10mA
100A
Output Voltage (0.5V/div)
0V
VOUT = 1.2V IOUT = 100mA COUT = 0.47F
Output Voltage (50mV/div)
VIN = VOUT + 1V VOUT = 3.3V COUT = 0.47F
Time (200s/div)
Time (100s/div)
Line Transient Response
6V 4V
Input Voltage (2V/div)
0V
Output Voltage (200mV/div)
VOUT = 3.3V IOUT = 1mA COUT = 0.47F 0V
Time (200s/div)
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MIC5232 PD = (4.3V - 3.3V) * 10mA PD = 0.01W To determine the maximum ambient operating temperature of the package, use the junction-toambient thermal resistance of the device and the following basic equation:
PD(max) = T J (max) - T A
Application Information
Input Capacitor If there is more than 20cm of wire between IN and the ac filter capacitor or if supplied from a battery, a 1F (or larger) capacitor should be placed from the IN (supply input) to GND (ground). Output Capacitors The MIC5232 requires an output capacitor for stability. A 0.47F, or larger capacitor, is recommended between OUT (output) and GND to improve the regulator's transient response. A 0.47F capacitor can be used to reduce overshoot recovery time at the expense of overshoot amplitude. The ESR (effective series resistance) of this capacitor has no effect on regulator stability, but low-ESR capacitors improve the high frequency transient response. The value of this capacitor may be increased without limit, but values larger than 10F tend to increase the settling time after a step change in input voltage or output current. Minimum Load Current The MIC5232 does not require a minimum load for proper operation. This allows the device to operate in applications where very light output currents are required for keep-alive purposes. This is important for powering SRAM or Flash memory in low-power modes for handheld devices. Safe Operating Conditions The MIC5232 incorporates current limit in the design. There is also reverse circuit protection circuitry built into the device. The maximum junction temperature for the device is +125C, and it is important that this is not exceeded for any length of time. Thermal Considerations The MIC5232 is designed to provide 10mA of continuous current in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given that the input voltage is 4.3V, the output voltage is 3.3V and the output current = 10mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT) IOUT + VIN IGND Because this device is CMOS and the ground current is typically <15A over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation.
JA
TJ(max) = 125C, the max. junction temperature of the die, JA thermal resistance = 90C/W Table 1 shows junction-to-ambient thermal resistance for the MIC5232 in the 2mm x 2mm MLF(R)-6 package.
Package
JA Recommended
Minimum Footprint
(R)
JC 2C/W
2mm x 2mm MLF -6
90C/W
Table 1. MLF Thermal Resistance
Substituting PD for PD(max), and solving for the ambient operating temperature, will give the maximum operating conditions for the regulator circuit. The junction-to-ambient thermal resistance for the minimum footprint is 90C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5232-3.3BML at an input voltage of 4.3V and 10mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows:
0.01 = W
125C - T A 90C / W
TA = 124C Therefore, a 3.3V application at 10mA of output current can accept an ambient operating temperature of 124C in a 2mm x 2mm MLF(R)-6 package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the "Regulator Thermals" section of Micrel's "Designing with Low-Dropout Voltage Regulators" handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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MIC5232
Package Information
5-Pin TSOT-23 (D5)
6-Pin 2mm x 2mm MLF (ML)
(R)
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MIC5232
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Inc.
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