MIC2811/2821
Digital Power Management IC
2MHz, 600mA DC/DC with
Triple 300mA LDOs
General Description
The MIC2811/21 are high performance power
management ICs, supporting four output voltage rails with
maximum efficiency. The four rails are generated by a
single 600mA DC/DC converter and three 300mA LDOs.
LDO1 and LDO2 are capable of operating at a low input
voltage down to 1.65V useful for post regulating the output
voltage of the DC-DC converter. The MIC2811 supports
the use of a bypass cap for improved noise performance
on LDO1 & LDO2 while the MIC2821 offers a separate
enable pin for LDO3.
Featuring an operating frequency of 2MHz, the DC to DC
converter uses small values of L and C to reduce board
space but still retains operating efficiencies up to 86% at
load currents up to 600mA.
The MIC2811/21 feature a µCap design, operating with
very small ceramic output capacitors and inductors for
stability, reducing required board space and component
cost and it is available in fixed output voltages in the 16-
pin 3mm × 3mm MLF
®
leadless package.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
2MHz DC/DC converter and 3 LDOs
Tiny 16-pin 3mm x 3mm MLF
®
package
Thermal Shutdown Protection
±2% Output Voltage Accuracy on all outputs
Current Limit Protection
2.7V to 5.5V input voltage range
Output current to 600mA
2MHz PWM operation
Up to 86% efficiency (1.2V output)
1.65V to 5.5V input voltage range
300mA output current
Fixed Output voltage as low as 0.8V
Low 142mV dropout
70dB PSRR at 1kHz
2.7V to 5.5V input voltage range
300mA output current
Fixed Output voltage as low as 1.0V
DC/DC Converter
LDO 1 & 2
LDO 3
Applications
•
Mobile phones / PDAs
•
Portable media players
•
Mobile Television Receivers
____________________________________________________________________________________________________________
Typical Application
1.2VOUT Efficiency
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
L = 2.2µH
C = 2.2µF
100 200 300 400 500 600
OUTPUT CURRENT (mA)
3V
3.6V
4.2V
MicroLeadFrame
and MLF 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
April 2008
M9999-042208-A
Micrel, Inc.
MIC2811/2821
Ordering Information
Part Number
MIC2811-4GJLYML
MIC2811-4GMSYML
MIC2821-4GJLYML
MIC2821-4GMSYML
Note:
1. Output Voltage of DC/DC, LDO1, LDO2, LDO3 respectively
For additional voltage options, contact Micrel Marketing. Available fixed output voltage range for each output is as follows:
DC/DC
LDO1
LDO2
LDO3
min
1.0
0.8
0.8
1.0
max
2.0 (Adjustable output also available)
3.6
3.6
3.9
Marking Code
YHA4
YHA3
YJA2
YJA3
Voltage
(1)
Junction
Temperature
Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
(2)
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
1.2V/1.8V/2.5V/2.7V
1.2V/1.8V/2.8V/3.3V
1.2V/1.8V/2.5V/2.7V
1.2V/1.8V/2.8V/3.3V
2. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
April 2008
2
M9999-042208-A
Micrel, Inc.
MIC2811/2821
Pin Configuration
BYP
EN2
EN2
EN
EN3
EN
FB
EN1
BIAS
SGND
PGND
VIN1
LDO1
VIN
LDO3
EN1
BIAS
SGND
PGND
FB
VIN1
LDO1
VIN
LDO3
SW
DVIN
VIN2
MIC2811
®
16-Pin 3mm x 3mm MLF (ML)
(Top View)
LDO2
MIC2821
®
16-Pin 3mm x 3mm MLF (ML)
(Top View)
Pin Description
Pin Number
MIC2811
1
2
3
4
5
6
7
8
9
10
11
12
13
Pin Number
MIC2821
1
2
3
4
5
6
7
8
9
10
11
12
13
Pin Name
EN1
BIAS
SGND
PGND
SW
DVIN
VIN2
LDO2
LDO3
VIN
LDO1
VIN1
FB
Pin Name
Enable Input (LDO 1). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
Internal circuit bias supply. It must be de-coupled to signal ground with a
0.1µF capacitor and should not be loaded.
Signal ground.
Power ground.
Switch (Output): Internal power MOSFET output switches.
Power Supply for DC/DC converter. Must be tied to VIN.
Power Supply to LDO2.
Output of LDO2.
Output of LDO3.
Supply to bias circuitry and power to LDO3, must be tied to DVIN.
Output of LDO1.
Power Supply to LDO1.
Feedback input to the error amplifier of the DC/DC converter.
Adjust version: Use external resistor divider from DC/DC output to set VOUT.
Fixed voltage version: Connect directly to VOUT of the DC/DC converter.
Reference Bypass. Connect external 0.1µF to GND to reduce output noise.
May be left open. Do not connect directly to GND.
Enable Input (LDO3). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
Enable Input (DC/DC and LDO3). Active High Input. Logic High = On; Logic
Low = Off; Do not leave floating.
Enable Input (DC/DC). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
Enable Input (LDO2). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
14
N/A
15
N/A
16
N/A
14
N/A
15
16
BYP
EN3
EN
EN
EN2
April 2008
3
LDO2
SW
DVIN
VIN2
M9999-042208-A
Micrel, Inc.
MIC2811/2821
Absolute Maximum Ratings
(1)
Supply Voltage (DV
IN
, V
IN
, V
IN1
, V
IN2
) ................... 0V to +6V
Enable Voltage (V
EN
, V
EN1
, V
EN2
, V
EN3
) ................ 0V to +6V
Power Dissipation ................................. Internally Limited
(3)
Lead Temperature (Soldering, 10 sec.) ..................... 260°C
Storage Temperature (T
S
)...................–65°C
≤
T
J
≤
+150°C
ESD Rating
(4)
................................................................. 2kV
Operating Ratings
(2)
Supply voltage (DV
IN,
V
IN
) ......................... +2.7V to +5.5V
Supply voltage (V
IN1,
V
IN2
) ............................+1.65V to V
IN
Enable Input Voltage (V
EN
, V
EN1
, V
EN2
, V
EN3
) ...... 0V to V
IN
Junction Temperature Range (T
J
) .........–40°C to +125°C
Package Thermal Resistance
3mm x 3mm MLF-16 (θ
JA
) .............................56°C/W
Electrical Characteristics
(5)
DV
IN
= V
IN
= V
IN1
= V
IN2
= V
OUTMAX
+ 1V, L = 2.2µH; C
OUTDC/DC
= 2.2µF, C
OUT1
= C
OUT2
= C
OUT3
= 2.2µF; I
OUTDC/DC
= 20mA;
I
OUTLDO1
= I
OUTLDO2
= I
OUTLDO2
= 100µA; T
J
= 25°C,
bold
values indicate –40°C < T
J
< +125°C; unless noted.
Parameter
UVLO Threshold
UVLO Hysteresis
Ground Pin Current
Conditions
Rising input voltage during turn-on (DVIN & VIN Only)
V
FB
= 1.1*V
FBNOM
(not switching);
LDO2 or LDO1 Only (V
EN
= V
EN3
= GND)
LDO3 only (V
EN
= V
EN1
= V
EN2
= GND / MIC2821 only)
All 3 LDOs
Min
2.45
Typ
2.55
100
800
55
40
120
0.2
160
23
Max
2.65
1100
85
95
Units
V
mV
µA
µA
µA
µA
µA
µA
Ground Pin Current in
Shutdown
Over-temperature Shutdown
Over-temperature Shutdown
Hysteresis
Enable Input Voltage
Enable Input Current
All EN = 0V
5
°
C
°
C
0.2
V
V
µA
Logic Low
Logic High
1.1
0.1
1
Electrical Characteristics - DC/DC Converter
DV
IN
= V
IN
= V
EN
= V
OUTDC/DC
+ 1V, L = 2.2µH; C
OUTDC/DC
= 2.2µF, C
OUT1
= C
OUT2
= C
OUT3
= 2.2µF; I
OUTDC/DC
= 20mA; T
J
= 25°C,
bold
values indicate –40°C to + 125°C; unless noted.
Parameter
Output Voltage Accuracy
Current Limit in PWM Mode
FB pin input current (ADJ only)
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
Switch ON-Resistance
Oscillator Frequency
Conditions
Fixed Output Voltages
V
FB
= 0.9*V
FBNOM
V
OUT
> 2.4V; V
IN
= V
OUT
+ 300mV to 5.5V, I
LOAD
= 20mA
V
OUT
< 2.4V; V
IN
= 2.7V to 5.5V, I
LOAD
= 20mA
20mA < I
LOAD
< 300mA
V
FB
≤
0.4V
PMOS (0.7*V
FBNOM
)
NMOS (1.1*V
FBNOM
)
Min
-2
-3
0.75
Typ
Max
+2
+3
Units
%
%
A
nA
%/V
%/V
1.2
1
0.2
0.2
1.8
1.5
%
%
Ω
Ω
100
0.5
0.55
1.8
I
LOAD
= 300mA; C
BYP
= 0.1µF
2
83
2.2
350
MHz
µs
Turn-on Time
Turn-on Time (DC/DC)
April 2008
4
M9999-042208-A
Micrel, Inc.
MIC2811/2821
Electrical Characteristics - LDO1 and LDO2
V
IN
= DV
IN
= V
OUTMAX
+ 1V, V
IN1
= V
EN1
= V
LDO1
+ 1V; V
IN2
= V
EN2
= V
LDO2
+ 1V ; C
OUTLDO1
= C
OUTLDO2
= 2.2µF, I
LDO1
= I
LDO2
= 100µA; T
J
=
25°C, V
EN
= V
EN3
= GND,
bold
values indicate –40°C< T
J
< +125°C; unless noted.
Parameter
Output Voltage Accuracy
Output Current Capability
Load Regulation
Line Regulation
Dropout Voltage
Current Limit
Ripple Rejection
Output Voltage Noise
Conditions
Min
-2.0
-3.0
Typ
Max
+2.0
+3.0
Units
%
%
mA
%
%/V
mV
mA
dB
dB
µV
RMS
V
IN
> 1.8V
I
OUT
= 100µA to 300mA
V
IN1(2)
= V
LDO1(2)
+1V to 5.5V
I
OUT
= 300mA @ Vout > 1.5V
V
OUT
= 0V
f = up to 1kHz; C
OUT
= 2.2µF; C
BYP
= 0.1µF
f = 20kHz; C
OUT
= 2.2µF; C
BYP
= 0.1µF
C
OUT
= 2.2µF; C
BYP
= 0.1µF; 10Hz to 100KHz
300
0.3
0.02
142
1.5
0.3
300
900
350
650
70
44
30
Electrical Characteristics – LDO3
V
IN
= DV
IN
= V
EN3
= V
LDO3
+1 V; C
OUT3
= 2.2µF; I
OUTLDO3
= 100µA; T
J
= 25°C, V
EN1
= V
EN2
= GND
bold
values indicate –40°C< T
J
< +125°C; unless noted.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
Ripple Rejection
Current Limit
Output Voltage Noise
Notes:
Conditions
Min
-2.0
-3.0
Typ
Max
+2.0
+3.0
Units
%
%
%/V
%
mV
dB
dB
V
IN
= V
OUT
+1V to 5.5V; I
OUT
= 100µA
I
OUT
= 100µA to 300mA @ 3.3V
I
OUT
= 300mA @ Vin = 2.7V
f = up to 1kHz; C
OUT
= 2.2µF
f = 20kHz; C
OUT
= 2.2µF
V
OUT
= 0V
C
OUT
= 2.2µF, 10Hz to 100kHz
0.03
0.50
210
45
20
0.5
1.5
350
350
600
470
980
mA
µV
RMS
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, 1.5k in series with 100pF.
5. Specification for packaged product only.
April 2008
5
M9999-042208-A
嵌入式系统
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