MIC5233 DATA SHEET (11/05/2015) DOWNLOAD

MIC5233
High Input Voltage
Low IQ µCap LDO Regulator
General Description
Features
The MIC5233 is a 100mA highly accurate, low dropout
regulator with high input voltage and ultra-low ground
current. This combination of high voltage and low ground
current makes the MIC5233 ideal for multi-cell Li-Ion
battery systems.
A µCap LDO design, the MIC5233 is stable with either
ceramic or tantalum output capacitor. It only requires a
2.2µF capacitor for stability.
Features of the MIC5233 include enable input, thermalshutdown, current-limit, reverse-battery protection, and
reverse-leakage protection.
Available in fixed and adjustable output voltage versions,
the MIC5233 is offered in the IttyBitty® SOT-23-5 and
SOT223-3 package with a junction temperature range of
−40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
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Wide input voltage range: 2.3V to 36V
Ultra-low ground current: 18µA
Low dropout voltage of 270mV at 100mA
High output accuracy of ±2.0% over temperature
µCap: stable with ceramic or tantalum capacitors
Excellent line and load regulation specifications
Zero shutdown current
Reverse-battery protection
Reverse-leakage protection
Thermal-shutdown and current-limit protection
IttyBitty® SOT-23-5 and SOT-223-3 packages
Applications
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Keep-alive supply in notebook and portable computers
USB power supply
Logic supply for high-voltage batteries
Automotive electronics
Battery-powered systems
3 − 4 cell Li-Ion battery input range
_________________________________________________________________________________________________________________________
Typical Application
Ultra-Low Current Adjustable Regulator Application
Ground Current vs. Input Voltage
IttyBitty is a registered trademark of Micrel, 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
July 2012
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Micrel, Inc.
MIC5233
Ordering Information
Marking
Voltage
Junction Temperature Range(1)
Package
MIC5233-1.8YM5
L318
1.8V
−40°C to +125°C
SOT-23-5
MIC5233-2.5YM5
L325
2.5V
−40°C to +125°C
SOT-23-5
MIC5233-3.0YM5
L330
3.0V
−40°C to +125°C
SOT-23-5
MIC5233-3.3YM5
L333
3.3V
−40°C to +125°C
SOT-23-5
Part Number
MIC5233-5.0YM5
L350
5.0V
−40°C to +125°C
SOT-23-5
MIC5233YM5
L3AA
Adjustable
−40°C to +125°C
SOT-23-5
MIC5233-3.3YS
33YS
3.3V
−40°C to +125°C
SOT-223
Note:
1.
Other voltages available. Contact Micrel for details.
Pin Configuration
5-Pin SOT-23 (M5)
3-Pin SOT-223 (S)
Pin Description
Pin Number
SOT-223
Pin Number
SOT-23
Pin Name
Pin Function
1
1
IN
Supply Input.
2
2
GND
3
4
3
TAB
July 2012
5
Ground.
EN
Enable (Input). Logic LOW = shutdown; logic HIGH = enable.
NC
No Connect.
ADJ
Adjustable (Input). Feedback input; connect to resistive voltage-divider network.
OUT
Regulator Output.
GND
Ground.
2
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MIC5233
Absolute Maximum Ratings(1)
Operating Ratings(2)
Input Supply Voltage (VIN).............................. −20V to +38V
Enable Input Voltage (VEN)............................ −0.3V to +38V
Power Dissipation (PDIS)............................Internally Limited
Junction Temperature (TJ) ........................−40°C to +125°C
Storage Temperature (TS).........................−65°C to +150°C
ESD Rating(3) ................................................. ESD Sensitive
Input Supply Voltage (VIN)............................. +2.3V to +36V
Enable Input Voltage (VEN)................................. 0V to +36V
Junction Temperature (TJ) ........................ −40°C to +125°C
Package Thermal Resistance
SOT-23-5 (θJA) .................................................235°C/W
SOT-223 (θJA) ....................................................50°C/W
Electrical Characteristics(4)
TJ = 25°C with VIN = VOUT + 1V; IOUT = 100µA; Bold values indicate –40°C < TJ < +125°C; unless otherwise specified.
Parameter
Condition
Min.
Output Voltage Accuracy
Variation from nominal VOUT
Typ.
Max.
−1.0
+1.0
−2.0
+2.0
Units
%
Line Regulation
VIN = VOUT + 1V to 36V
0.04
0.5
%
Load Regulation
IOUT = 100µA to 100mA
0.25
1
%
IOUT = 100µA
Dropout Voltage
50
230
IOUT = 50mA
400
270
IOUT = 100mA
mV
400
450
18
IOUT = 100µA
Ground Current
300
30
35
IOUT = 50mA
0.25
0.70
IOUT = 100mA
1
2
µA
mA
Ground Current in Shutdown
VEN ≤ 0.6V; VIN + 36V (SOT-23 package only)
0.1
1
µA
Short-Circuit Current
VOUT = 0V
190
350
mA
Output Leakage, Reverse Polarity Input
Load = 500Ω; VIN = −15V
−0.1
µA
Enable Input (SOT-23 Package Only)
Input LOW Voltage
Regulator OFF
Input HIGH Voltage
Regulator ON
2.0
VEN = 0.6V; Regulator OFF
−1.0
Enable Input Current
Start-Up Time
0.6
V
V
0.01
1.0
VEN = 2.0V; Regulator ON
0.1
1.0
VEN = 36V; Regulator ON
0.5
2.5
Guaranteed by design
1.7
7
µA
ms
Notes:
1.
Exceeding the absolute maximum rating may damage the device.
2.
The device is not guaranteed to function outside its operating rating.
3.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
4.
Specification for packaged product only
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MIC5233
Typical Characteristics
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Typical Characteristics (Continued)
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Functional Characteristics
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MIC5233
Functional Diagrams
Fixed Output Voltage (M5 Package)
Fixed Output Voltage (S Package)
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Functional Diagrams (Continued)
Adjustable Output Voltage
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MIC5233
To determine the maximum power dissipation of the
package, use the junction-to-ambient thermal resistance
of the device and the following Equation 1:
Application Information
Enable/Shutdown
The MIC5233 comes with an active-high enable pin that
allows the regulator to be disabled. Forcing the enable
pin low disables the regulator and sends it into a “zero”
off-mode-current state. In this state, current consumed
by the regulator goes nearly to zero. Forcing the enable
pin high enables the output voltage.
⎛ TJ(MAX) − TA
PD(MAX) = ⎜⎜
θ JA
⎝
Eq. 1
TJ(MAX) is the maximum junction temperature of the die,
125°C, and TA is the ambient operating temperature. θJA
is layout dependent; Table 1 shows examples of the
junction-to-ambient thermal resistance for the MIC5233:
Input Capacitor
The MIC5233 has high input voltage capability up to
36V. The input capacitor must be rated to sustain
voltages that may be used on the input. An input
capacitor may be required when the device is not near
the source power supply or when supplied by a battery.
Small, surface mount, ceramic capacitors can be used
for bypassing. A larger value may be required if the
source supply has high ripple.
Output Capacitor
The MIC5233 requires an output capacitor for stability.
The design requires 2.2µF or greater on the output to
maintain stability. The design is optimized for use with
low-ESR ceramic chip capacitors. High-ESR capacitors
may cause high-frequency oscillation. The maximum
recommended ESR is 3Ω. The output capacitor can be
increased without limit. Larger valued capacitors help to
improve transient response.
X7R/X5R dielectric-type ceramic capacitors are
recommended
because
of
their
temperature
performance. X7R-type capacitors change capacitance
by 15% over their operating temperature range and are
the most stable type of ceramic capacitors. Z5U and
Y5V dielectric capacitors change value by as much as
50% and 60% respectively over their operating
temperature ranges. To use a ceramic chip capacitor
with Y5V dielectric, the value must be much higher than
an X7R ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
Package
θJA Recommended
Minimum Footprint
SOT-23-5
235°C/W
SOT223
50°C/W
Table 1. SOT23-5 and SOT-223 Thermal Resistance
The actual power dissipation of the regulator circuit can
be determined using Equation 2:
PD = (VIN − VOUT)IOUT + VIN × IGND
Eq. 2
Substituting PD(MAX) for PD and solving for the operating
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC5233-3.0YM5 at
50°C with a minimum footprint layout, the maximum
input voltage for a set output current can be determined
as follows:
⎛ 125°C − 50°C ⎞
PD(MAX) = ⎜
⎟
⎝ 235°C/W ⎠
Eq. 3
where PD(MAX) = 319mW.
No-Load Stability
The MIC5233 will remain stable and in regulation with no
load unlike many other voltage regulators. This is
especially important in CMOS RAM keep-alive
applications.
The junction-to-ambient (θJA) thermal resistance for the
minimum footprint is 235°C/W, from Table 1. It is
important that the maximum power dissipation not be
exceeded to ensure proper operation. Since the
MIC5233 was designed to operate with high input
voltages, careful consideration must be given so as not
to overheat the device. With very high input-to-output
voltage differentials, the output current is limited by the
total power dissipation.
Thermal Consideration
The MIC5233 is designed to provide 100mA of
continuous current in a very-small package. Maximum
power dissipation can be calculated based on the output
current and the voltage drop across the part.
July 2012
⎞
⎟
⎟
⎠
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MIC5233
Maximum input voltage for a 10mA load current at 50°C
ambient temperature is 34.9V, utilizing virtually the entire
operating voltage range of the device.
Total power dissipation is calculated using the following
equation:
PD = (VIN − VOUT)IOUT + VIN × IGND
Eq. 4
Adjustable Regulator Application
The MIC5233BM5 can be adjusted from 1.24V to 20V by
using two external resistors (Figure 1). The resistors set
the output voltage based on the following equation:
Due to the potential for input voltages up to 36V, ground
current must be taken into consideration.
If we know the maximum load current, we can solve for
the maximum input voltage using the maximum power
dissipation calculated for a 50°C ambient, 319mV.
⎛ ⎛ R1 ⎞ ⎞
VOUT = VREF ⎜⎜1+ ⎜
⎟ ⎟⎟
⎝ ⎝ R2 ⎠ ⎠
PD(MAX) = (VIN − VOUT)IOUT + VIN × IGND
where VREF = 1.24V.
319mW = (VIN − 3V)100mA + VIN × 2.8mA Eq. 5
Feedback resistor R2 should be no larger than 300kΩ.
Ground pin current is estimated using the typical
characteristics of the device.
619mW = VIN (102.8mA)
VIN = 6.02V
Eq. 8
Eq. 6
For higher current outputs only a lower input voltage will
work for higher ambient temperatures.
Assuming a lower output current of 10mA, the maximum
input voltage can be recalculated:
Figure 1. Adjustable Voltage Application
319mW = (VIN − 3V)10mA + VIN × 0.1mA
349mW = VIN × 10.1mA
VIN = 34.9V
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Eq. 7
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MIC5233
Package Information
5-Pin SOT-23 (M5)
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Package Information (Continued)
3-Pin SOT-223 (S)
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
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
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© 2003 Micrel, Incorporated.
July 2012
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