MIC5325
Low V
IN
/V
OUT
400mA ULDO™
with Ultra-Low IQ
General Description
The MIC5325 is a high-performance, µCap, low-dropout
regulator, offering ultra-low operating current while
maintaining very fast transient response. The MIC5325
can source up to 400mA of output current and allows a low
input supply voltage source to increase system efficiency.
Ideal for battery operated applications; the MIC5325 offers
high accuracy, extremely low dropout voltage, and low
ground current at all load conditions. The MIC5325 can
also be put into a zero-off-mode current state, drawing
virtually no current when disabled.
The MIC5325 is available in fixed-output voltages in the
6-pin 2mm x 2mm Thin MLF
®
leadless package.
Data sheets and support documentation can be found on
Micrel’s web site at
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
Wide-input voltage range: 1.7V to 5.5V
Stable with 1µF ceramic output capacitor
Ultra-low-dropout voltage ULDO™ 110mV @ 400mA
±2% voltage accuracy over temperature
Bias supply voltage range: 2.5V to 5.5V
Ultra-low ground current 35µA typical
400mA maximum output current per LDO
Very fast transient response
Thermal-shutdown and current-limit protection
Tiny 6-pin 2mm x 2mm Thin MLF
®
package
Applications
•
•
•
•
Low-power handheld devices
Portable electronics
GPS receivers
Post regulator
___________________________________________________________________________________________________________
Typical Application
ULDO is a trademark of Micrel, Inc
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
March 2011
M9999-030811-C
Micrel, Inc.
MIC5325
Ordering Information
Part Number
MIC5325-1.2YMT
MIC5325-1.5YMT
MIC5325-1.8YMT
MIC5325-3.6YMT
Notes:
1.
2.
Other voltages available. Contact Micrel for details.
▲
= Pin 1 identifier.
Marking Code
QG4
QGF
QGG
QGV
Output
Voltage
1.2V
1.5V
1.8V
3.6V
Temperature Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
6-Pin 2mm x 2mm Thin MLF
®
6-Pin 2mm x 2mm Thin MLF
®
®
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
6-Pin 2mm x 2mm Thin MLF
6-Pin 2mm x 2mm Thin MLF
®
Pin Configuration
6-Pin 2mm x 2mm Thin MLF
®
(MT)
Pin Description
Pin
Number
1
2
3
4
5
6
Pin Name
VBIAS
GND
IN
OUT
BYP
EN
Pin Function
Bias Input Voltage.
Ground
Power Input for LDO.
Output of regulator.
Bypass: Connect a capacitor to ground to reduce noise and reduce ripple rejection.
Enable Input: Active High Input. Logic High = On; Logic Low = Off. Do not leave floating.
March 2011
2
M9999-030811-C
Micrel, Inc.
MIC5325
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................ 0V to V
BIAS
Bias Voltage (V
BIAS
) ................................................ 0V to 6V
Enable Voltage (V
EN
)........................................... 0V to V
BIAS
Power Dissipation (P
D
) ........................... Internally Limited
(3)
Lead Temperature (soldering, 10 µsec.).................... 260°C
Junction Temperature (T
J
) ........................–40°C to +125°C
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(4)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
)......................................... 1.7V to V
BIAS
Bias Voltage (V
BIAS
).......................................... 2.5V to 5.5V
Enable Voltage (V
EN
)........................................... 0V to V
BIAS
Junction Temperature (T
J
) ........................ –40°C to +125°C
Junction Thermal Resistance
2x2 Thin MLF-6 (θ
JA
) .........................................90°C/W
Electrical Characteristics
(5)
V
BIAS
= 3.6V or V
IN
(whichever is greater); V
IN
= V
OUT
+ 1V; C
OUT
= 1µF; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C to +125°C,
unless noted.
Parameter
Output Voltage Accuracy
V
BIAS
Line Regulation
V
IN
Line Regulation
Load Regulation
V
IN
Dropout Voltage
Ground Pin Current
Ground Pin Current in Shutdown
Ripple Rejection
Current Limit
Output Voltage Noise
Enable Inputs (EN)
Enable Input Voltage
Enable Input Current
Turn-On Time
Logic Low
Logic High
V
IL
≤
0.2V
V
IH
≥
1V
C
OUT
= 1µF; C
BYP
= 10nF
1.2
0.01
0.02
150
500
0.2
V
V
µA
µA
µs
Condition
Variation from nominal V
OUT
V
BIAS
= V
IN
to 5.5V; V
IN
= V
OUT
+ 1V
V
BIAS
= 5.5V; V
IN
= V
OUT
+ 1V to 5.5V
I
OUT
= 100µA to 400mA
I
OUT
= 400mA
I
OUT
= 100µA to 400mA; V
IN
= V
EN
; V
BIAS
= 5.5V
V
EN
≤
0.2V
f = up to 1kHz; C
OUT
= 1µF; no C
BYP
f = up to 1kHz; C
OUT
= 1µF; C
BYP
= 10nF
f = 1kHz – 20kHz; C
OUT
= 1µ F; C
BYP
= 10nF
V
OUT
= 0V
C
OUT
= 1µF; C
BYP
= 10nF; 10Hz to 100kHz
450
Min.
–2.0
0.03
0.02
0.3
110
35
0.01
60
65
40
680
30
Typ.
Max.
+2.0
0.6
0.6
2
250
55
1
Units
%
%
%
%
mV
µA
µA
dB
dB
dB
mA
µV
RMS
Notes:
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 T
A
(ambient temperature) is P
D(max)
= (T
J(max)
– T
A
) /
θ
JA
. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
5. Specification for packaged product only.
March 2011
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M9999-030811-C
Micrel, Inc.
MIC5325
Typical Characteristics
-120
-100
-80
-60
-40
400mA
Power Supply
Rejection Ratio (V
IN
)
100mA
50mA
100µA
(NO BYP)
100µA
-120
-100
-80
Power Supply
Rejection Ratio (V
BIAS
)
100µA
100µA
(NO BYP)
10
9
8
7
6
5
4
3
2
Ground Current (V
IN
)
vs. V
IN
-60
-40
V
IN
= V
OUT
+1V
V
OUT
= 1.2V
-20
C
OUT
= 1µF
400mA
C
BYP
= 0.01µF
0
0.1
1
10
100
FREQUENCY (kHz)
V
IN
= V
OUT
+1V
300mA
V
OUT
= 1.2V
-20
C
OUT
= 1µF
C
BYP
= 0.01µF
0
0.1
1
10
100
FREQUENCY (kHz)
1,000
1,000
1
0
1.5 2 2.5 3 3.5 4 4.5 5 5.5
VIN (V)
V
BIAS
= 5.5V
V
OUT
= 1.8V
C
OUT
= 1µF
C
BYP
= 0.01µF
10
9
8
7
6
5
4
3
2
1
0
0
Ground Current (V
IN
)
vs. Output Current
18
16
14
12
10
8
6
Ground Current (V
BIAS
)
vs. Output Current
30
28
26
24
22
20
18
Ground Current (Total)
vs. Output Current
V
IN
= 2.8V
V
OUT
= 1.8V
C
OUT
= 1µF
C
BYP
= 0.01µF
4
2
0
0
V
BIAS
= 3.6V
V
IN
= 2.8V
V
OUT
= 1.8V
C
OUT
= 1µF
C
BYP
= 0.01µF
16
14
12
10
0
50 100 150 200 250 300 350 400
OUTPUT CURRENT (mA)
50 100 150 200 250 300 350 400
OUTPUT CURRENT (mA)
50 100 150 200 250 300 350 400
OUTPUT CURRENT (mA)
2.0
100µA
1.8
1.6
400mA
1.4
1.2
1.0
Output Voltage
vs. V
IN
140
120
Dropout Voltage
vs. Temperature
140
120
Dropout Voltage
vs. Output Current
400mA
100
80
60
200mA
100
80
60
40
100mA
0.8
0.6
V
BIAS
= 5.5V
0.4
V
OUT
= 1.8V
0.2
C
OUT
= 1µF
0
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
VIN (V)
40
20
20
0
0
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
V
BIAS
= 3.6V
V
IN
= 2.8V
C
OUT
= 1µF
C
BYP
= 0.01µF
C
BAIS
= 1µF
C
IN
= 1µF
50 100 150 200 250 300 350 400
OUTPUT CURRENT (mA)
20
18
16
14
12
10
100µA
8
6
400mA
4
V
BIAS
= 3.6V
V
IN
= 2.8V
2
V
OUT
= 1.8V
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Ground Current (V
IN
)
vs. Temperature
900
875
850
825
800
775
750
725
700
V
BIAS
= 5.5V
675
V
OUT
= 1.8V
650
C
OUT
= 1µF
625
C
IN
= 1µF
600
1.5 2 2.5 3 3.5 4 4.5 5 5.5
VIN (V)
Current Limit
vs. V
IN
1.8
Output Voltage
vs. Output Current
1.75
1.7
V
BIAS
= 3.6V
V
IN
= 2.8V
C
OUT
= 1µF
C
BYP
= 0.01µF
C
IN
= 1µF
1.65
1.6
0
50 100 150 200 250 300 350 400
OUTPUT CURRENT (mA)
March 2011
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M9999-030811-C
Micrel, Inc.
MIC5325
Typical Characteristics (Continued)
1.30
Output Voltage
vs. Temperature
20
18
16
14
12
10
8
Bias Current
vs. Enable Voltage
400mA
10
Output Noise
Spectral Density
V
IN
= 4.5V
V
OUT
= 1.8V
C
OUT
= 1µF
C
BYP
= 0.01µF
1.25
1
100µA
V
BIAS
= 3.6V
V
IN
= 2.8V
V
OUT
= 1.8V
C
IN
= 1µF
C
OUT
= 1µF
C
BYP
= 0.01µF
1.20
V
IN
= 2.2V
V
BIAS
= 3.6V
V
OUT
= 1.2V
C
OUT
= 1µF
I
OUT
= 100µA
1.15
6
4
0.1
1.10
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
2
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
ENABLE VOLTAGE (V)
0.01
10
Noise (10Hz to 1MHz) = 59µV
RMS
100
1K
10K 100K
FREQUENCY (Hz)
1M
March 2011
5
M9999-030811-C
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