MIC5501/2/3/4
300 mA Single Output LDO in Small Packages
Features
General Description
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The MIC5501/2/3/4 is an advanced general-purpose
LDO ideal for powering general-purpose portable
devices. The MIC5501/2/3/4 family of products
provides a high-performance 300 mA LDO in an
ultra-small 1 mm x 1 mm package. The MIC5502 and
MIC5504 LDOs include an auto-discharge feature on
the output that is activated when the enable pin is low.
The MIC5503 and MIC5504 have an internal pull-down
resistor on the enable pin that disables the output when
the enable pin is left floating. This is ideal for
applications where the control signal is floating during
processor boot up.
Input Voltage Range: 2.5V to 5.5V
Fixed Output Voltages from 1.0V to 3.3V
300 mA Guaranteed Output Current
High Output Accuracy (±2%)
Low Quiescent Current: 38 μA
Stable with 1 μF Ceramic Output Capacitors
Low Dropout Voltage: 160 mV @ 300 mA
Output Discharge Circuit: MIC5502, MIC5504
Internal Enable Pull-Down: MIC5503, MIC5504
Thermal-Shutdown and Current-Limit Protection
4-Lead 1.0 mm x 1.0 mm Thin DFN Package
MIC5501/4 5-Lead SOT23 Package
Applications
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Smartphones
DSC, GPS, PMP, and PDAs
Medical Devices
Portable Electronics
5V Systems
Ideal
for
battery-powered
applications,
the
MIC5501/2/3/4 offers 2% initial accuracy, low dropout
voltage (160 mV at 300 mA), and low ground current
(typically 38 μA). The MIC5501/2/3/4 can also be put
into a zero-off-mode current state, drawing virtually no
current when disabled.
The MIC5501/2/3/4 has an operating
temperature range of –40°C to +125°C.
junction
Package Types
MIC5501/2/3/4
4-Lead DFN (MT)
(Top View)
VIN
EN
4
3
MIC5501/4
SOT23-5 (M5)
(Top View)
EN GND VIN
1
2
3
EP
1
2
VOUT
GND
2019 Microchip Technology Inc.
4
NC
5
VOUT
DS20006006B-page 1
MIC5501/2/3/4
Typical Application Circuit
MIC5501/2/3/4
MIC550X-xYMT
VIN
VBAT
1μF
VOUT
1μF
EN
GND
DS20006006B-page 2
2019 Microchip Technology Inc.
MIC5501/2/3/4
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (VIN) .................................................................................................................................... –0.3V to +6V
Enable Voltage (VEN) .................................................................................................................................... –0.3V to VIN
Power Dissipation (PD) ............................................................................................................. Internally Limited, Note 1
ESD Rating (Note 2) ..................................................................................................................................................3 kV
Operating Ratings ‡
Supply Voltage (VIN) ................................................................................................................................. +2.5V to +5.5V
Enable Voltage (VEN) ......................................................................................................................................... 0V to VIN
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice: The device is not guaranteed to function outside its operating ratings.
Note 1: The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) – TA)/θJA.
Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
2: Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series
with 100 pF.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: VIN = VEN = VOUT + 1V; CIN = COUT = 1 μF; IOUT = 100 μA; TJ = +25°C, bold values
indicate –40°C to +125°C, unless noted.
Parameter
Output Voltage Accuracy
Symbol
VOUT
Min.
Typ.
Max.
–2.0
—
2.0
–3.0
—
3.0
Units
Conditions
Variation from nominal VOUT
%
Variation from nominal VOUT;
–40°C to +125°C
Line Regulation
—
—
0.02
0.3
%/V
VIN = VOUT +1V to 5.5V; IOUT =
100 μA
Load Regulation (Note 1)
—
—
8
40
mV
IOUT = 100 μA to 300 mA
Dropout Voltage (Note 2)
VDO
—
80
190
—
160
380
Ground Pin Current (Note 3)
IGND
—
38
55
—
42
65
IGND(SHDN)
—
0.05
1
μA
VEN = 0V
PSRR
—
60
—
dB
f = 1 kHz; COUT = 1 μF
VOUT = 0V
Ground Pin Current in
Shutdown
Ripple Rejection
Current Limit
mV
μA
ILIM
400
630
900
mA
Output Voltage Noise
en
—
175
—
μVRMS
Auto-Discharge NFET
Resistance
—
—
25
—
Ω
—
—
4
—
MΩ
—
—
0.2
1.2
—
—
IOUT = 150 mA
IOUT = 300 mA
IOUT = 0 mA
IOUT = 300 mA
COUT = 1 μF, 10 Hz to 100 kHz
MIC5502, MIC5504 Only;
VEN = 0V; VIN = 3.6V; IOUT = –3 mA
Enable Input
Enable Pull-Down Resistor
Enable Input Voltage
2019 Microchip Technology Inc.
VEN
V
For MIC5503 and MIC5504 use
only
Logic-Low
Logic-High
DS20006006B-page 3
MIC5501/2/3/4
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics: VIN = VEN = VOUT + 1V; CIN = COUT = 1 μF; IOUT = 100 μA; TJ = +25°C, bold values
indicate –40°C to +125°C, unless noted.
Parameter
Enable Input Current
MIC5501, MIC5502
Symbol
IEN
Enable Input Current
MIC5503, MIC5504
IEN
Turn-On Time
tON
Note 1:
2:
3:
Min.
Typ.
Max.
—
0.01
1
—
0.01
1
—
0.01
1
—
1.4
2
—
50
125
Units
μA
μA
μs
Conditions
VEN = 0V
VEN = 5.5V
VEN = 0V
VEN = 5.5V
COUT = 1 μF; IOUT = 150 mA
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in
output voltage due to heating effects are covered by the thermal regulation specification.
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. For outputs below 2.5V, dropout voltage is the input-to-output
differential with the minimum input voltage 2.5V.
Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum
of the load current plus the ground pin current.
DS20006006B-page 4
2019 Microchip Technology Inc.
MIC5501/2/3/4
TEMPERATURE SPECIFICATIONS (Note 1)
Parameters
Symbol
Min.
Typ.
Max.
Units
Conditions
Storage Temperature Range
TS
–65
—
+150
°C
—
Maximum Junction Temperature Range
TJ
–40
—
+150
°C
—
Operating Junction Temperature Range
TJ
–40
—
+125
°C
—
Lead Temperature
—
—
—
+260
°C
Soldering, 10s
Thermal Resistance 1 mm x 1 mm Thin DFN-4
JA
—
250
—
°C/W
—
Thermal Resistance SOT23-5
JA
—
253
—
°C/W
—
Temperature Ranges
Package Thermal Resistances
Note 1:
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability.
2019 Microchip Technology Inc.
DS20006006B-page 5
MIC5501/2/3/4
2.0
Note:
TYPICAL PERFORMANCE CURVES
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
FIGURE 2-1:
Ratio.
Power Supply Rejection
FIGURE 2-4:
Voltage.
Ground Current vs. Supply
FIGURE 2-2:
Current.
Dropout Voltage vs. Output
FIGURE 2-5:
Current.
Ground Current vs. Load
FIGURE 2-3:
Temperature.
Dropout Voltage vs.
FIGURE 2-6:
Temperature.
Ground Current vs.
DS20006006B-page 6
2019 Microchip Technology Inc.
MIC5501/2/3/4
FIGURE 2-7:
Current.
Output Voltage vs. Output
FIGURE 2-10:
Voltage.
Current Limit vs. Supply
VIN = 3V
VOUT = 1.8V
CIN = COUT = 1μF
VEN
(500mV/div)
VOUT
(500mV/div)
Time (10μs/div)
FIGURE 2-8:
Voltage.
Output Voltage vs. Supply
FIGURE 2-11:
VEN
(1V/div)
Enable Turn-On.
VIN = 4.3V
VOUT = 3.3V
CIN = COUT = 1μF
VOUT
(1V/div)
Time (20μs/div)
FIGURE 2-9:
Temperature.
Output Voltage vs.
2019 Microchip Technology Inc.
FIGURE 2-12:
Enable Turn-On.
DS20006006B-page 7
MIC5501/2/3/4
VOUT = 3.3V
CIN = COUT = 1μF
VIN = 3.8V
VOUT = 2.8V
CIN = COUT = 1μF
IOUT
(100mA/div)
VOUT
(AC-COUPLED)
(100mV/div)
VEN
(1V/div)
VOUT
(1V/div)
Time (100μs/div)
FIGURE 2-13:
Time (20μs/div)
FIGURE 2-16:
Load Transient.
Auto-Discharge (No Load).
VIN = 4.3V
VOUT = 3.3V
CIN = COUT = 1μF
IOUT
(100mA/div)
VOUT
(AC-COUPLED)
(100mV/div)
Time (100μs/div)
FIGURE 2-14:
Load Transient.
5.5V
VOUT = 2.8V
CIN = COUT =1μF
IOUT = 300mA
3.8V
VIN
(2mV/div)
VOUT
(AC-COUPLED
(50mV/div)
Time (100μs/div)
FIGURE 2-15:
DS20006006B-page 8
Line Transient.
2019 Microchip Technology Inc.
MIC5501/2/3/4
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
4-Lead TDFN
Pin Number
SOT23-5
Pin Number
Pin Name
1
5
VOUT
Output Voltage. When disabled the MIC5502 and MIC5504
switches on an internal 25Ω load to discharge the external
capacitors.
2
2
GND
Ground.
3
3
EN
Description
Enable Input: Active-High. High = ON; Low = OFF. For MIC5501
and MIC5502 do not leave floating. MIC5503 and MIC5504 have
an internal pull-down and this pin may be left floating.
4
1
VIN
Supply Input.
—
4
NC
No Connection. Pin is not internally connected.
EP
—
ePAD
2019 Microchip Technology Inc.
Exposed Heatsink Pad. Connect to GND for best thermal
performance.
DS20006006B-page 9
MIC5501/2/3/4
4.0
APPLICATION INFORMATION
MIC5501/2/3/4 are low-noise 300 mA LDOs. The
MIC5502 and MIC5504 include an auto-discharge
circuit that is switched on when the regulator is
disabled through the enable (EN) pin. The MIC5503
and MIC5504 have an internal pull-down resistor on the
EN pin to ensure the output is disabled if the control
signal is tri-stated. The MIC5501/2/3/4 regulators are
fully protected from damage due to fault conditions,
offering linear current limiting and thermal shutdown.
The MIC5501/2/3/4 is not suitable for RF transmitter
systems.
4.1
Input Capacitor
The MIC5501/2/3/4 are high performance, high
bandwidth devices. An input capacitor of 1 μF is
required from the input to ground to provide stability.
Low-ESR ceramic capacitors provide optimal
performance at a minimum of space. Additional high
frequency capacitors, such as small-valued NPO
dielectric-type capacitors, help filter out high frequency
noise and are good practice in any RF-based circuit.
X5R or X7R dielectrics are recommended for the input
capacitor. Y5V dielectrics lose most of their
capacitance over temperature and are therefore, not
recommended.
4.2
Output Capacitor
The MIC5501/2/3/4 require an output capacitor of 1 μF
or greater to maintain stability. The design is optimized
for use with low-ESR ceramic chip capacitors. High
ESR capacitors are not recommended because they
may cause high frequency oscillation. The output
capacitor can be increased, but performance has been
optimized for a 1 μF ceramic output capacitor and does
not improve significantly with larger capacitance.
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.
4.3
No-Load Stability
Unlike many other voltage regulators, the
MIC5501/2/3/4 remain stable and in regulation with no
load. This is especially important in CMOS RAM
keep-alive applications.
DS20006006B-page 10
4.4
Enable/Shutdown
The MIC5501/2/3/4 each come with an active-high
enable pin that allows the regulator to be disabled.
Forcing the EN pin low disables the regulator and
sends it into an off mode current state drawing virtually
zero current. When disabled, the MIC5502 and
MIC5504 switches an internal 25Ω load on the
regulator output to discharge the external capacitor.
Forcing the EN pin high enables the output voltage.
The MIC5501 and MIC5502 enable pin uses CMOS
technology and the EN pin cannot be left floating; a
floating EN pin may cause an indeterminate state on
the output. The MIC5503 and MIC5504 have an
internal pull-down resistor on the enable pin to disable
the output when the enable pin is floating.
4.5
Thermal Considerations
The MIC5501/2/3/4 are designed to provide 300 mA 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. For example if the input voltage is 3.6V,
the output voltage is 2.8V, and the output current is
300 mA. The actual power dissipation of the regulator
circuit can be determined using Equation 4-1:
EQUATION 4-1:
P D = V IN – V OUT 1 I OUT + V IN I GND
Because this device is CMOS and the ground current
is typically
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