MIC5311-DKYML [MICREL]
LowQ? Mode Dual 300mA LDO; LOWQ ™模式双路，300mA LDO
| 型号： | MIC5311-DKYML |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | LowQ? Mode Dual 300mA LDO |
| 文件： | 总11页 (文件大小：343K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5311
LowQ™ Mode Dual 300mA LDO
General Description
Features
• Input voltage range: 2.5V to 5.5V
• LowQ™ Mode
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.
-
-
-
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
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.
• Ultra-low quiescent current of 28µA total in Full
Current Mode
• High output accuracy
-
-
±1.0% initial accuracy
±2.0% over temperature
The MIC5311 is a µCap design, operating with very
small ceramic output capacitors for stability, reducing
required board space and component cost.
• Thermal Shutdown Protection
• Current Limit Protection
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.
Applications
• Cellular/PCS phones
• Wireless modems
• PDAs
• MP3 Players
Typical Application
VIN
VOUT1
VOUT2
VCORE
VI/O
EN1
EN2
Baseband
µProcessor
LOWQ
BYP
GND
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
M9999-032706
(408) 955-1690
March 2006
Micrel, Inc.
MIC5311
Ordering Information
Part Number
Output
Voltage*
Junction Temp. Range
Package
Standard
Pb-Free
MIC5311-GMBML
MIC5311-DKBML
MIC5311-GMYML
MIC5311-DKYML
MIC5311-NLYML
1.8V/2.8V
1.85V/2.6V
2.85V/2.7V
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
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
10 VOUT1
9 VOUT2
8 NC
VIN
EN1
1
2
3
4
5
EN2
7 NC
LOWQ
BYP
6 GND
MIC5311-xxBML (3x3)
Pin Description
Fixed
Pin Name
Pin Function
Supply Input. (VIN1 and VIN2 are internally tied together)
Enable Input (regulator 1). Active High Input. Logic High = On; Logic Low = Off;
1
2
VIN
EN1
Do not leave floating
3
4
5
EN2
LowQ™
BYP
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.
6
7
GND
NC
Ground.
8
NC
9
10
EP
VOUT
VOUT
GND
2
1
Output of regulator 2
Output of regulator 1
Ground. Internally connected to the Exposed Pad.
2
M9999-032706
(408) 955-1690
March 2006
Micrel, Inc.
MIC5311
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (VIN)..............................0V to 6V
Enable Input Voltage (VEN).............................0V to 6V
LowQ™ Input Voltage (VLowQ™)......................0V to 6V
Power Dissipation (PD)..................Internally Limited (3)
Junction Temperature ....................... -40°C to +125°C
Lead Temperature (soldering, 5sec.).................260°C
Storage Temperature (Ts) ................. -65°C to +150°C
Supply Input Voltage (VIN)..........................2.5V to 5.5V
Enable Input Voltage (EN1/EN2/LowQ™) ...... 0V to VIN
Junction Temperature (TJ) ..................-40°C to +125°C
Package Thermal Resistance
MLF-10 (θJA)................................................. 63°C/W
Electrical Characteristics (Full Power Mode)
VIN = VOUT + 1.0V for higher output of the regulator pair; LowQ™ = VIN; COUT = 2.2µF, IOUT = 100µA; TJ = 25°C, bold
values indicate -40°C to +125, unless noted.
Parameter
Output Voltage Accuracy
Conditions
Min
-1.0
-2.0
Typ
Max
+1.0
+2.0
0.3
0.6
Units
%
%
Variation from nominal VOUT
Variation from nominal VOUT; -40°C to +125°C
VIN = VOUT +1V to 5.5V
Line Regulation
Load Regulation
Dropout Voltage
0.02
%/V
I
OUT = 100
µ
A to 150mA
A to 300mA
0.35
0.7
1.0
1.5
%
%
IOUT = 100
µ
IOUT = 150mA
OUT = 300mA
60
120
mV
mV
240
I
Ground Pin Current
45
50
µA
µA
µA
IOUT1 = IOUT2 = 100µA to 300mA
28
Ground Pin Current in
Shutdown
VEN < 0.2V
0.1
Ripple Rejection
f = up to 1kHz; COUT = 2.2
f = 1kHz – 20kHz; COUT = 2.2
µ
F ceramic; CBYP = 10nF
65
35
dB
dB
µF ceramic; CBYP = 10nF
Current Limit
Output Voltage Noise
350
450
45
700
mA
µVrms
VOUT = 0V (Both Regulators)
COUT = 2.2µF, CBYP = 0.01µF, 10Hz to 100kHz
Enable and LowQ™ Input (EN1/EN2/LowQ™)
Enable Input Voltage
Logic Low
Logic High
0.2
V
1.0
V
Enable Input Current
VIL < 0.2V
VIH > 1.0V
COUT = 2.2µF; CBYP = 0.01µF
0.1
0.1
300
1
1
500
µA
µA
µs
Turn-on Time
Light Load Response
Response Time (4)
Into Light Load
50
50
µs
µs
Out of Light Load
3
M9999-032706
(408) 955-1690
March 2006
Micrel, Inc.
MIC5311
Electrical Characteristics (LowQ™ Mode)
VIN = VOUT + 1.0V for higher output of the regulator pair; LowQ™ = 0V; COUT = 2.2µF, IOUT = 100µA; TJ = 25°C, bold
values indicate -40°C to +125°C, unless noted.
Parameter
Output Voltage Accuracy
Conditions
Variation from nominal VOUT
Min
-2.0
-3.0
Typ
Max Units
+2.0
%
%
+3.0
Line Regulation
Load Regulation
Dropout Voltage
VIN = VOUT +1V to 5.5V
0.02
0.1
0.3
0.6
0.5
%/V
%
IOUT = 100µA to 10mA
IOUT = 10mA
100
200
mV
Ground Pin Current
Both outputs enabled
7
10
12
1.0
µA
µA
µA
Ground Pin Current in
Shutdown
VEN < 0.2V
0.01
Ripple Rejection
f = up to 1kHz; COUT = 2.2µF ceramic; CBYP = 10nF
45
30
dB
dB
f = 1kHz – 20kHz; COUT = 2.2µF ceramic; CBYP = 10nF
Current Limit
VOUT = 0V (Both regulators)
40
75
150
mA
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 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.
4. Response time defined as the minimum hold-off time after the LowQ™ command before applying load transients.
4
M9999-032706
(408) 955-1690
March 2006
Micrel, Inc.
MIC5311
Typical Characteristics
Ripple Rejection
vs. ILOAD (Normal Mode)
90
Ripple Rejection
LowQ Mode
Output Voltage
vs. Temperature
90
80
70
60
50
40
30
20
10
0
2.7
2.65
2.6
80
70
60
2.55
2.5
50
50mA
40
150mA
2.45
2.4
VOUT=1.85V
IN=VOUT+1V
ILOAD=10mA
OUT= 2.2 µF Ceramic
VOUT=1.85V
30
V
=VOUT+1V
VIN
20
10
0
C
OUT=2.2µF
CBYP= 10nF
1k
2.35
2.3
C
300mA
1M
100µA
25
0
50
75
100 125
10
1k
1M
10k 100k
100
10
100
10k 100k
FREQUENCY (Hz)
FREQUENCY (Hz)
Dropout vs.
Temperature (Normal Mode)
Dropout vs.
Temperature (LowQ Mode)
140
Dropout Characteristics
3
2.5
2
160
300mA
150mA
100mA
10mA
140
120
100
80
120
100
80
60
40
20
0
150mA
300mA
6mA
3mA
1.5
1
60
40
50mA
0.5
20
VOUT=2.6V
0
0
0
1
2
3
4
5
6
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
Ground Current
vs. Temperature
Ground Current
vs. Temperature (LowQ Mode)
35
30
25
20
15
10
5
35
30
25
20
15
10
5
9
300mA
300mA
8
50mA
10mA
7
100µA
100mA
100mA
6
5
4
3
2
1
0
150mA
150mA
10mA LowQ™
0
0
-40 -20
0
20 40 60 80 100120
1.3 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
SUPPLY VOLTAGE (V)
-40 -20
0
20 40 60 80 100 120
Output Noise
Spectral Density
1
0.1
VIN = 4.45V
COUT = 2.2 µF
CBYP = 0.01µF
VOUT = 1.8V
ROUT
0.01
0.001
10M
10k 100k 1M
10 100
FREQUENCY (Hz)
1k
5
M9999-032706
(408) 955-1690
March 2006
Micrel, Inc.
MIC5311
Functional Characteristics
Enable On- Normal
Enable Off - Normal
ILOAD = 200mA
VOUT = 2.6V
ILOAD = 200mA
VOUT = 2.6V
Time (40µs/div)
Time (10µs/div)
Line Transient - LowQ
Line Transient - Normal
5.5V
5.5V
4V
4V
VOUT = 2.6V
VIN = VOUT + 1V
COUT = 2.2µF
LowQ = 0V
ILOAD = 300mA
VOUT = 2.6V
COUT = 2.2µF
LowQ = 5.5V
ILOAD = 10mA
Time (200µs/div)
Time (40µs/div)
Load Transient - LowQ
Load Transient - Normal
300mA
10mA
0mA
100µA
VOUT = 2.6V
= VOUT + 1V
COUT = 2.2µF
VOUT = 2.6V
VIN = VOUT + 1V
COUT = 2.2µF
V
IN
Time (200µs/div)
Time (1ms/div)
6
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(408) 955-1690
March 2006
Micrel, Inc.
MIC5311
Functional Characteristics (cont.)
Normal to LowQ Transient
LowQ to Normal Transient
TM
TM
LowQ
LowQ
Normal
Normal
ILOAD = 10mA
ILOAD = 10mA
Time (40µs/div)
Time (40µs/div)
7
M9999-032706
(408) 955-1690
March 2006
Micrel, Inc.
MIC5311
Functional Diagram
VIN
VOUT1
VOUT2
LDO1
EN1
LOWQ
EN2
LowQ™
LDO2
BYP
Reference
GND
MIC5311 Block Diagram
8
M9999-032706
(408) 955-1690
March 2006
Micrel, Inc.
MIC5311
Functional Description
Thermal Considerations
The MIC5311 is designed to provide 300mA of
continuous current per channel in a very small MLF
package. Maximum power dissipation can be calculated
based on the output current and the voltage drop across
the part. To determine the maximum power dissipation
of the package, use the junction-to-ambient thermal
resistance of the device and the following basic
equation:
The MIC5311 is a high performance, low quiescent
current power management IC consisting of two µCap
low dropout regulators with a LowQ™ mode featuring
lower operating current. Both regulators are capable of
sourcing 300mA.
Enable 1 and 2
The enable inputs allow for logic control of both output
voltages with individual enable inputs. The enable input
is active high, requiring 1.0V for guaranteed operation.
The enable input is CMOS logic and cannot be left
floating.
PD (max) = (TJ (max) - TA) /θJA
TJ (max) is the maximum junction temperature of the
die, 125°C, and TA is the ambient operating
temperature. θJA is layout dependent; Table 1 shows
examples of the junction-to-ambient thermal resistance
for the MIC5311.
LowQ™ Mode
The LowQ™ pin is logic level low, requiring <0.2V to
enter the LowQ™ mode. The LowQ™ pin cannot be left
floating. Features of the LowQ™ mode include lower
total quiescent current of typically 7uA.
θ
JA Recommended
Minimum Footprint
Package
θJC
Input Capacitor
3x3 MLF™-10
63°C/W
2°C/W
Good bypassing is recommended from input to ground
to help improve AC performance. A 1µF capacitor or
greater located close to the IC is recommended. Larger
load currents may require larger capacitor values.
Table 1. MLF™ Thermal Resistance
The actual power dissipation of the regulator circuit can
be determined using the equation:
P
P
P
DTOTAL = PD LDO1 + PD LDO2
D LDO1 = (VIN-VOUT1) x IOUT1
D LDO2 = (VIN-VOUT2) x IOUT2
Bypass Capacitor
The internal reference voltage of the MIC5311 can be
bypassed with a capacitor to ground to reduce output
noise and increase input ripple rejection (PSRR). A
quick-start feature allows for quick turn-on of the output
voltage. The recommended nominal bypass capacitor is
0.01µF, but an increase will result in longer turn on
times ton.
Substituting PD(max) for PD and solving for the operating
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC5311 at 60°C with
a minimum footprint layout, the maximum load currents
can be calculated as follows:
Output Capacitor
Each regulator output requires a 2.2µF ceramic output
capacitor for stability. The output capacitor value can be
increased to improve transient response, but
performance has been optimized for a 2.2µF ceramic
type output capacitor. 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% to 60% respectively over their
operating temperature ranges. To use a ceramic chip
capacitor with Y5V dielectric, the value must be much
higher than a X7R ceramic capacitor to ensure the same
minimum capacitance over the equivalent operating
temperature range.
PD (max) = (TJ (max) - TA) /θJA
PD (max) = (125°C - 60°C) / 63°C/W
PD (max) = 1.03W
The junction-to-ambient thermal resistance for the
minimum footprint is 63°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation. Using a lithium-ion battery as the
supply voltage of 4.2V, 1.8VOUT/150mA for channel 1
and 2.8VOUT/100mA for channel 2, power dissipation
can be calculated as follows:
PD LDO1 = (VIN-VOUT1) x IOUT1
PD LDO1 = (4.2V-1.8V) x 150mA
PD LDO1 = 360mW
PD LDO2 = (VIN-VOUT2) x IOUT2
PD LDO1 = (4.2V-2.8V) x 100mA
D LDO1 = 140mW
P
9
M9999-032706
(408) 955-1690
March 2006
Micrel, Inc.
MIC5311
PDTOTAL = PD LDO1 + PD LDO2
PDTOTAL = 360mW + 140mW
T
T
T
A(max) = TJ(max) – (PD x θJA)
A(max) = 125°C – (500mW x 63°C/W)
A(max) = 93.5°C
PDTOTAL = 500mW
The calculation shows that we are well below the
maximum allowable power dissipation of 1.03W for a
60° ambient temperature.
For a full discussion of heat sinking and thermal effects
on voltage regulators, refer to the “Regulator Thermals”
section of Micrel’s Designing with Low-Dropout Voltage
Regulators handbook.
After the maximum power dissipation has been
calculated, it is always a good idea to calculate the
maximum ambient temperature for a 125° junction
temperature. Calculating maximum ambient temperature
as follows:
This information can be found on Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
10
M9999-032706
(408) 955-1690
March 2006
Micrel, Inc.
MIC5311
Package Information
10-Pin 3x3 MLF (MLF)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for
its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a
product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for
surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant
injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk
and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.
© 2004 Micrel, Incorporated.
11
M9999-032706
(408) 955-1690
March 2006
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