MIC5312
LowQ
TM
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
TM
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
TM
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
TM
Mode
- 7µA total quiescent current
- 10mA output current capable LowQ
TM
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
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
January 2005
M9999-011205
(408) 955-1690
Micrel, Inc.
MIC5312
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
TM
C
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
TM
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.
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.
January 2005
3
M9999-011205
(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
TM
Input Voltage (V
LowQTM
) ..................... 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/LowQTM)
................ 0V to V
IN
Junction Temperature (T
JI
).................. -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; C
OUT
= 2.2µF, I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate
-40°C to +125, unless noted.
Parameter
Output Voltage Accuracy
Conditions
Variation from nominal V
OUT
Variation from nominal V
OUT
; -40°C to +125°C
V
IN
= V
OUT
+1V to 5.5V
Min
-1.0
-2.0
Typ
Max
+1.0
+2.0
0.3
0.6
1.0
1.5
240
45
50
Units
%
%
Line Regulation
Load Regulation
Dropout Voltage
Ground Pin Current
Ground Pin Current in
Shutdown
Ripple Rejection
Current Limit
Output Voltage Noise
TM
0.02
0.35
0.7
60
120
28
0.1
65
35
450
45
%/V
%
%
mV
mV
µA
µA
µA
dB
dB
mA
µVrms
V
V
µA
µA
µs
µs
µs
%
%
V
µA
V
V
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
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
V
OUT
= 0V (Both Regulators)
C
OUT
= 2.2
µ
F, C
BYP
= 0.01µF, 10Hz to 100kHz
TM
350
700
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
0.2
1.0
0.1
0.1
300
50
50
90
0.01
0.01
1.25
1.25
1
1
500
–1
0.75
97
0.1
+1
1.75
SET Pin Current Source
SET Pin Threshold Voltage
V
SET
= 0V
January 2005
4
M9999-011205
(408) 955-1690
Micrel, Inc.
MIC5312
Electrical Characteristics (LowQ
TM
Mode)
V
IN
= V
OUT
+ 1.0V for higher output of the regulator pair; C
OUT
= 2.2µF, I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate
-40°C to +125, unless noted.
Parameter
Output Voltage Accuracy
Conditions
Variation from nominal V
OUT
Min
-2.0
-3.0
Typ
Max
+2.0
+2.0
Units
%
%
Line Regulation
Load Regulation
Dropout Voltage
Ground Pin Current
Ground Pin Current in
Shutdown
Ripple Rejection
Current Limit
Notes:
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)
0.02
0.1
100
7
0.01
45
30
75
0.3
0.6
0.5
200
%/V
%
mV
µA
µA
µA
dB
dB
mA
10
12
1.0
40
150
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
TM
command before applying load transients.
January 2005
5
M9999-011205
(408) 955-1690
单片机
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