MIC5312
LowQ™ Mode Dual 300mA LDO
with Integrated POR
General Description
The MIC5312 is a high performance, dual µCap low
dropout regulator with integrated power-on reset
supervisor, 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 MIC5312
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 MIC5312
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 Power-on Reset is active low and indicates an
output undervoltage condition on either regulator 1 or 2
when the regulator is enabled.
The MIC5312 is a µCap design, operating with very
small ceramic output capacitors for stability, reducing
required board space and component cost.
The MIC5312 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
•
Integrated Power-on Reset (POR) with adjustable
delay time
•
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
SET
V
OUT1
V
OUT2
POR
V
CORE
V
I/O
Baseband
µProcessor
MIC5312-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
February 2005
M9999-021105
(408) 955-1690
Micrel, Inc.
MIC5312
Ordering Information
Part Number
MIC5312-GMBML
MIC5312-DKBML
Output
Voltage*
1.8V/2.8V
1.85V/2.6V
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
Package
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 POR
7 SET
6 GND
MIC5312-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
SET
POR
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.
Delay Set Input: Connect external capacitor to GND to set the internal delay for the
POR output. When left open, there is no delay. This pin cannot be grounded. Delay
= 1µs/1pF
Power-On Reset Output: Open-drain output. Active low indicates an output
undervoltage condition on either regulator 1 or regulator 2 when device is enabled.
Output of regulator 2
Output of regulator 1
Ground. Internally connected to the Exposed Pad.
February 2005
2
M9999-021105
(408) 955-1690
Micrel, Inc.
MIC5312
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
%
%
V
µA
µA
V
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
POR Output
VTH
Low Threshold, % of V
OUT
(Flag ON)
High Threshold, % of V
OUT
(Flag OFF)
VOL
POR Output Logic Low Voltage; I
L
= 250µA
IPOR
Flag Leakage Current, Flag OFF
SET INPUT
SET Pin Current Source
SET Pin Threshold Voltage
V
SET
= 0V
350
700
0.2
1.0
0.1
0.1
300
50
50
90
0.01
0.01
1.25
1.25
97
0.1
+1
1.75
1
1
500
–1
0.75
February 2005
3
M9999-021105
(408) 955-1690
Micrel, Inc.
MIC5312
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
February 2005
4
M9999-021105
(408) 955-1690
Micrel, Inc.
MIC5312
Typical Characteristics
Ripple Rejection
vs. I
LOAD
(Normal Mode)
90
80
70
PSRR (dB)
PSRR (dB)
60
50
40
50mA
90
80
70
60
50
40
.
30 V
OUT
=1.85V
V
IN
=V
OUT
+1V
20
=10mA
I
LOAD
10 C
= 2.2 µF Ceramic
0
10
OUT
Ripple Rejection
LowQ Mode
OUTPUT VOLTAGE (V)
2.7
2.65
2.6
2.55
2.5
2.45
2.4
2.35
2.3
0
Output Voltage
vs. Temperature
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)
100µA
25
50
75
100
125
3
OUTPUT VOLTAGE (V)
2.5
2
1.5
1
0.5
Dropout Characteristics
DROPOUT VOLTAGE (mV)
160
Dropout vs.
Temperature (Normal Mode)
DROPOUT VOLTAGE (mV)
300mA
140
120
100
Dropout vs.
Temperature (LowQ Mode)
10mA
100mA
150mA
300mA
140
120
100
80
60
40
20
0
-40 -20 0
80
60
40
20
0
-40 -20 0
150mA
6mA
3mA
50mA
0
0
V
OUT
=2.6V
1
2
3
4
5
SUPPLY VOLTAGE (V)
6
20 40 60 80 100 120
20 40 60 80 100 120
35
GROUND CURRENT (µA)
30
25
20
15
10
5
Ground Current
vs. Supply Voltage
300mA
GROUND CURRENT (µA)
100mA
35
30
25
20
15
10
5
Ground Current
vs. Temperature
50mA
150mA
300mA
Ground Current
vs. Temperature (LowQ Mode)
9
8
7
6
5
4
3
2
1
0
-40 -20 0
20 40 60 80 100 120
GROUND CURRENT (µA)
10mA
100µA
150mA
100mA
10mA LowQ™
0
1.3 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
SUPPLY VOLTAGE (V)
0
-40 -20 0
20 40 60 80 100 120
1
NOISE (µV/rootHz)
Output Noise
Spectral Density
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)
February 2005
5
M9999-021105
(408) 955-1690
微控制器 MCU
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