MIC5311
LowQ™ Mode Dual 300mA LDO
General Description
The MIC5311 is a high performance, dual µCap low
dropout regulator offering ultra-low operating current
and a second, even lower operating current mode,
LowQ™ mode, reducing operating current by 75%.
Each regulator can source up to 300mA of output
current maximum.
Ideal for battery operated applications, the MIC5311
offers 1% accuracy, extremely low dropout voltage
(60mV @ 150mA), and low ground current (typically
28µA total). When put into LowQ™ mode, the internal
current draw drops down to 7µA total. The MIC5311
also comes equipped with a TTL logic compatible
enable pin that allows the part to be put into a zero-off-
mode current state, drawing no current when disabled.
The MIC5311 is a µCap design, operating with very
small ceramic output capacitors for stability, reducing
required board space and component cost.
The MIC5311 is available in fixed output voltages in the
3mm x 3mm MLF-10 leadless package. Data sheets
and support documentation can be found on Micrel’s
web site at www.micrel.com.
Features
•
Input voltage range: 2.5V to 5.5V
•
LowQ™ Mode
- 7µA total quiescent current
- 10mA output current capable LowQ™ mode
- Logic level control with external pin
•
Stable with ceramic output capacitor
•
2 LDO Outputs – 300mA each
•
Tiny 3mm x 3mm MLF™-10 package
•
Low dropout voltage of 60mV @ 150mA
•
Ultra-low quiescent current of 28µA total in Full
Current Mode
•
High output accuracy
- ±1.0% initial accuracy
- ±2.0% over temperature
•
Thermal Shutdown Protection
•
Current Limit Protection
Applications
•
•
•
•
Cellular/PCS phones
Wireless modems
PDAs
MP3 Players
Typical Application
V
IN
EN1
EN2
LOWQ
BYP
GND
Baseband
µProcessor
V
OUT1
V
OUT2
V
CORE
V
I/O
MIC5311-xxBML
MLF and
MicroLeadFrame
are 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 2006
M9999-032706
(408) 955-1690
Micrel, Inc.
MIC5311
Ordering Information
Part Number
Standard
Pb-Free
MIC5311-GMBML
MIC5311-GMYML
MIC5311-DKBML
MIC5311-DKYML
MIC5311-NLYML
Output
Voltage*
1.8V/2.8V
1.85V/2.6V
2.85V/2.7V
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
10-Pin 3×3 MLF™
10-Pin 3×3 MLF™
10-Pin 3×3 MLF™
Note:
*Other Voltage options available between 1.25V and 5V. Contact Micrel for details.
Pin Configuration
V
IN
1
EN1 2
EN2 3
LOWQ 4
BYP 5
10 V
OUT1
9 V
OUT2
8 NC
7 NC
6 GND
MIC5311-xxBML (3x3)
Pin Description
Fixed
1
2
3
4
5
6
7
8
9
10
EP
Pin Name
V
IN
EN1
EN2
LowQ™
BYP
GND
NC
NC
V
OUT
2
V
OUT
1
GND
Pin Function
Supply Input. (V
IN1
and V
IN2
are internally tied together)
Enable Input (regulator 1). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating
Enable Input (regulator 2). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating
LowQ™ Mode. Active Low Input. Logic High = Full Power Mode; Logic Low = Light
Load Mode; Do not leave floating.
Reference Bypass: Connect external 0.01µF to GND to reduce output noise. May
be left open.
Ground.
Output of regulator 2
Output of regulator 1
Ground. Internally connected to the Exposed Pad.
March 2006
2
M9999-032706
(408) 955-1690
Micrel, Inc.
MIC5311
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
) .............................. 0V to 6V
Enable Input Voltage (V
EN
)............................. 0V to 6V
LowQ™ Input Voltage (V
LowQ™
)...................... 0V to 6V
Power Dissipation (P
D
) ..................Internally Limited
(3)
Junction Temperature ....................... -40°C to +125°C
Lead Temperature (soldering, 5sec.) .................260°C
Storage Temperature (T
s
) ................. -65°C to +150°C
Operating Ratings
(2)
Supply Input Voltage (V
IN
)..........................2.5V to 5.5V
Enable Input Voltage (EN1/EN2/LowQ™) ...... 0V to V
IN
Junction Temperature (T
J
) .................. -40°C to +125°C
Package Thermal Resistance
MLF-10 (θ
JA
) ................................................. 63°C/W
Electrical Characteristics (Full Power Mode)
V
IN
= V
OUT
+ 1.0V for higher output of the regulator pair; LowQ™ = V
IN
; C
OUT
= 2.2µF, I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate -40°C to +125, unless noted.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
Ground Pin Current
Ground Pin Current in
Shutdown
Ripple Rejection
Conditions
Variation from nominal V
OUT
Variation from nominal V
OUT
; -40°C to +125°C
V
IN
= V
OUT
+1V to 5.5V
I
OUT
= 100
µ
A to 150mA
I
OUT
= 100
µ
A to 300mA
I
OUT
= 150mA
I
OUT
= 300mA
I
OUT
1 = I
OUT
2 = 100µA to 300mA
V
EN
< 0.2V
Min
-1.0
-2.0
Typ
Max
+1.0
+2.0
0.3
0.6
1.0
1.5
240
45
50
Units
%
%
%/V
%
%
mV
mV
µA
µA
µA
dB
dB
mA
µVrms
V
V
µA
µA
µs
µs
µs
0.02
0.35
0.7
60
120
28
0.1
65
35
450
45
f = up to 1kHz; C
OUT
= 2.2
µ
F ceramic; C
BYP
= 10nF
f = 1kHz – 20kHz; C
OUT
= 2.2
µ
F ceramic; C
BYP
= 10nF
Current Limit
V
OUT
= 0V (Both Regulators)
Output Voltage Noise
C
OUT
= 2.2
µ
F, C
BYP
= 0.01µF, 10Hz to 100kHz
Enable and LowQ™ Input (EN1/EN2/LowQ™)
Enable Input Voltage
Logic Low
Logic High
Enable Input Current
V
IL
< 0.2V
V
IH
> 1.0V
Turn-on Time
C
OUT
= 2.2µF; C
BYP
= 0.01µF
Light Load Response
Response Time
(4)
Into Light Load
Out of Light Load
350
700
0.2
1.0
0.1
0.1
300
50
50
1
1
500
March 2006
3
M9999-032706
(408) 955-1690
Micrel, Inc.
MIC5311
Electrical Characteristics (LowQ™ Mode)
V
IN
= V
OUT
+ 1.0V for higher output of the regulator pair; LowQ™ = 0V; C
OUT
= 2.2µF, I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate -40°C to +125°C, unless noted.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
Ground Pin Current
Ground Pin Current in
Shutdown
Ripple Rejection
Current Limit
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. Response time defined as the minimum hold-off time after the LowQ™ command before applying load transients.
Conditions
Variation from nominal V
OUT
V
IN
= V
OUT
+1V to 5.5V
I
OUT
= 100
µ
A to 10mA
I
OUT
= 10mA
Both outputs enabled
V
EN
< 0.2V
f = up to 1kHz; C
OUT
= 2.2µF ceramic; C
BYP
= 10nF
f = 1kHz – 20kHz; C
OUT
= 2.2
µ
F ceramic; C
BYP
= 10nF
V
OUT
= 0V (Both regulators)
Min
-2.0
-3.0
Typ
Max
+2.0
+3.0
0.3
0.6
0.5
200
10
12
1.0
Units
%
%
%/V
%
mV
µA
µA
µA
dB
dB
mA
0.02
0.1
100
7
0.01
45
30
75
40
150
March 2006
4
M9999-032706
(408) 955-1690
Micrel, Inc.
MIC5311
Typical Characteristics
Ripple Rejection
vs. I
LOAD
(Normal Mode)
90
80
70
PSRR (dB)
PSRR (dB)
60
50
40
50mA
Ripple Rejection
LowQ Mode
90
80
70
60
50
40
.
30 V
OUT
=1.85V
V =V
+1V
20
IN OUT
=10mA
I
LOAD
10 C
= 2.2 µF Ceramic
0
10
OUT
Output Voltage
vs. Temperature
2.7
OUTPUT VOLTAGE (V)
2.65
2.6
2.55
2.5
2.45
2.4
2.35
2.3
0
100µA
25
50
75
100
125
150mA
30 V
OUT
=1.85V
+1V
V =V
20
IN OUT
= 2.2µF
C
10
OUT
C
= 10nF
300mA
BYP
0
10
1k
100
10k 100k 1M
FREQUENCY (Hz)
1k
100
10k 100k 1M
FREQUENCY (Hz)
Dropout Characteristics
3
DROPOUT VOLTAGE (mV)
Dropout vs.
Temperature (Normal Mode)
160
DROPOUT VOLTAGE (mV)
140
120
100
80
60
40
20
0
-40 -20 0
20 40 60 80 100 120
50mA
150mA
300mA
Dropout vs.
Temperature (LowQ Mode)
140
120
100
80
60
40
20
0
-40 -20 0
20 40 60 80 100 120
3mA
6mA
10mA
OUTPUT VOLTAGE (V)
2.5
2
1.5
1
0.5
0
0
100mA
150mA
300mA
V
OUT
=2.6V
1
2
3
4
5
SUPPLY VOLTAGE (V)
6
Ground Current
vs. Supply Voltage
35
300mA
GROUND CURRENT (µA)
GROUND CURRENT (µA)
30
25
20
15
10
5
0
1.3 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
SUPPLY VOLTAGE (V)
10mA LowQ™
150mA
100mA
30
25
20
15
10
5
35
Ground Current
vs. Temperature
50mA
300mA
Ground Current
vs. Temperature (LowQ Mode)
9
GROUND CURRENT (µA)
8
7
6
5
4
3
2
1
0
-40 -20 0
20 40 60 80 100 120
10mA
100µA
150mA
100mA
0
-40 -20 0
20 40 60 80 100 120
Output Noise
Spectral Density
1
NOISE (µV/rootHz)
0.1
0.01 V
IN
= 4.45V
C
OUT
= 2.2 µF
C
BYP
= 0.01µF
V
OUT
= 1.8V
R
0.001
OUT
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
March 2006
5
M9999-032706
(408) 955-1690
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