MIC2810
Digital Power Management IC
2MHz, 600mA DC/DC w/Dual
300mA/300mA Low V
IN
LDOs
General Description
The MIC2810 is a high performance power management
IC, integrating a 2MHz DC/DC switcher with two 300mA
LDOs. The MIC2810 features a
LOWQ
®
mode, reducing
the total current draw while in this mode to less than 30µA.
In
LOWQ
®
mode, the output noise of the DC/DC converter
is 53µV
RMS
, significantly lower than other converters that
use a PFM light load mode that can interfere with sensitive
RF circuitry.
The MIC2810 is a µCap design, operating with very small
ceramic output capacitors and inductors for stability,
therefore, reducing required board space and component
cost. It is available with fixed output voltages in a 16-pin
3mm x 3mm MLF
®
leadless package.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
DC/DC Converter
•
2.7V to 5.5V input voltage range
•
Output current to 600mA in PWM mode
•
LOWQ
®
Mode: NO NOISE light load mode
– 53µV
RMS
Output noise in
LOWQ
®
mode
•
2MHz PWM operation in normal mode
LDOs
•
LDO1
– 1.65V to 5.5V input voltage range
– 300mA Output current
– Output voltage down to 0.8V
•
LDO2
– 2.7V to 5.5V input voltage range
– 300mA Output current
– Output voltage down to 0.8V
Applications
•
•
•
•
•
Mobile phones
PDAs
GPS receivers
Digital still cameras
Portable media players
Features
•
2MHz DC/DC converter and two LDOs
•
Integrated power-on reset (OR function for all outputs)
– Adjustable delay time
•
LOWQ
®
mode
– 30µA Total I
Q
when in
LOWQ
®
mode
•
Tiny 16-pin 3mm x 3mm MLF
®
package
•
Thermal shutdown protection
•
Current limit protection
Typical Application
1.2V
OUT
Efficiency
MIC2810-xxxYML
V
IN
2.7V to 5.5V
4.7µF
90
V
OUT
2.2µH
2.2µF
VIN
VIN1
VIN2
EN
EN1
LOWQ
EN2
BIAS
PGND
0.1µF
LDO
SW
80
Memory/DSP
70
60
V
IN
=3V
V
IN
=3.6V
V
IN
=4.2V
LDO1
LDO2
POR
CSET
SGND
0.01µF
50
Baseband
2.2µF
ceramic
2.2µF
ceramic
40
30
20
GND
GND
10
0
100 200 300 400 500 600
OUTPUT CURRENT (mA)
LOWQ
is a registered trademark of Micrel, Inc.
MLF and
MicroLeadFrame
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
February 2008
M9999-022008-C
Micrel, Inc.
MIC2810
Ordering Information
Part Number
MIC2810-44MYML
MIC2810-4GKYML
MIC2810-4GMYML
MIC2810-4GPYML
MIC2810-4GSYML
MIC2810-4LSYML
MIC2810-4MSYML
MIC2810-CGJYML
MIC2810-FGSYML
Notes:
MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Other voltage options available. Please contact Micrel for details.
DC/DC –Output Voltage Range of 1.0V to 2.0V.
LDO1 – Output Voltage Range of 0.8V to 3.6V.
LDO2 – Output Voltage Range of 0.8V to 3.6V.
* Refers to nominal output voltage of DC/DC, LDO1, and LDO2 respectively.
Marking
Code
YD44M
YD4GK
YD4GM
YD4GP
YD4GS
YD4LS
YD4MS
YDCGJ
YDFGS
Voltage*
1.2V/1.2V/2.8V
1.2V/1.8V/2.6V
1.2V/1.8V/2.8V
1.2V/1.8V/3.0V
1.2V/1.8V/3.3V
1.2V/2.7V/3.3V
1.2V/2.8V/3.3V
1.2V/1.8V/2.5V
1.5V/1.8V/3.3V
Junction
Temperature Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
16-Pin 3x3 MLF
16-Pin 3x3 MLF
®
®
®
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
16-Pin 3x3 MLF
®
®
February 2008
2
M9999-022008-C
Micrel, Inc.
MIC2810
Pin Configuration
®
16-Pin 3mm x 3mm MLF (ML)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
/LOWQ
BIAS
SGND
PGND
SW
VIN
VIN2
LDO2
LDO
VIN1
LDO1
POR
CSET
EN1
EN
EN2
Pin Function
LOWQ Mode. Active Low Input. Logic High = Full Power (Normal) Mode;
Logic Low = LOWQ Mode; 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: Internal power MOSFET output switches.
Supply Input – DC/DC and other circuitry shared with LDO1 and LDO2. Must be
connected to PIN 7.
Supply Input – LDO2. Must be connected to PIN 6.
Output of LDO2
LDO Output: Connect to V
OUT
of the DC/DC for LOWQ mode operation.
Supply Input – LDO1.
Output of LDO1
Power-On Reset Output: Open-drain output. Active low indicates an output
undervoltage condition on either one of the three regulated outputs.
Delay Set Input: Connect external capacitor to GND to set the internal delay for the
POR output. When left open, there is minimum delay. This pin cannot be grounded.
Enable Input (LDO 1). 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 (LDO 2). Active High Input. Logic High = On; Logic Low = Off; Do not
leave floating
February 2008
3
M9999-022008-C
Micrel, Inc.
MIC2810
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
, V
IN1
, V
IN2
)............................... 0V to 6V
Enable Input Voltage (V
EN
, V
EN1
, V
EN2
)................... 0V to V
IN
Power Dissipation .................................. Internally Limited
(3)
Lead Temperature (soldering, 10 sec.)...................... 260°C
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(4)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
, V
IN2
)................................. 2.7V to 5.5V
Supply Voltage (V
IN1
)...................................... 1.65V to 5.5V
Enable Input Voltage (V
EN
, V
EN1
, V
EN2
)................... 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Junction Thermal Resistance
MLF-16 (θ
JA
) ......................................................56°C/W
Electrical Characteristics
(5)
V
IN
= V
IN1
= V
IN2
= EN1 = EN2 = EN = /LOWQ = V
OUT
(6)
+ 1V; C
OUTDC/DC
= 2.2µF, C
LDO1
= C
LDO2
= 2.2µF; I
OUTDC/DC
= 100mA;
I
OUTLDO1
= 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
V
FB
= GND (not switching);
LDO1 or LDO2 (EN = GND; EN1 or EN2 = GND)
Ground Pin Current in
Shutdown
Ground Pin Current
(LOWQ
®
mode)
EN = EN1 = EN2 = 0V
I
DC/DC
< I
LDO1
< I
LDO2
< 10mA (/LOWQ = GND)
LDO1 or LDO2 (EN = GND; EN1 or EN2 = GND);
I
OUT
< 10mA (/LOWQ = GND)
Over-temperature Shutdown
Over-temperature Shutdown
Hysteresis
Enable Inputs (EN; EN1; EN2;
/LOWQ
)
Enable Input Voltage
Logic Low
Logic High
Enable Input Current
V
IL
< 0.2V
V
IH
> 1.0V
Turn-on Time
Turn-on Time
(LDO1 and LDO2)
Turn-on Time (DC/DC)
(/LOWQ = V
IN
; I
LOAD
= 300mA); (/LOWQ = GND; I
LOAD
=
10mA)
POR Output
VTH
Low Threshold, % of nominal (V
DC/DC
or V
LDO1
or V
LDO2
) (Flag
ON)
High Threshold, % of nominal (V
DC/DC
AND V
LDO1
AND
V
LDO2
) (Flag OFF)
VOL
POR Output Logic Low Voltage; IL = 250µA
IPOR
Flag Leakage Current, Flag OFF
SET INPUT
SET Pin Current Source
VSET = 0V
SET Pin Threshold Voltage
POR = High
Min
2.45
Typ
2.55
100
800
55
0.2
38
20
160
23
Max
2.65
1100
85
95
5
60
80
70
Units
V
mV
µA
µA
µA
µA
µA
µA
µA
°C
°C
0.2
1.0
0.1
0.1
240
83
1
1
500
350
V
V
µA
µA
µs
µs
90
91
96
10
0.01
99
100
1
1.75
%
%
mV
µA
µA
V
0.75
1.25
1.25
February 2008
4
M9999-022008-C
Micrel, Inc.
MIC2810
Electrical Characteristics - DC/DC Converter
V
IN
= V
OUTDC/DC
+ 1; EN = V
IN
; EN2 = EN1 = GND; I
OUTDC/DC
= 100mA ;L = 2.2µH; C
OUTDC/DC
= 2.2µF; T
J
= 25°C,
bold
values indicate –40°C to + 125°C; unless noted.
Parameter
LOWQ = High (Full Power Mode)
Fixed Output Voltages
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
PWM Switch ON-Resistance
Oscillator Frequency
Current Limit in PWM Mode
Nominal V
OUT
tolerance
V
OUT
> 2.4V; V
IN
= V
OUT
+ 300mV to 5.5V, I
LOAD
= 100mA
V
OUT
< 2.4V; V
IN
= 2.7V to 5.5V, I
LOAD
= 100mA
20mA < I
LOAD
< 600mA
V
FB
≤
0.4V
I
SW
= 150mA V
FB
= 0.7V
FB_NOM
PMOS
I
SW
= -150mA V
FB
= 1.1V
FB_NOM
NMOS
V
FB
= 0.9*V
NOM
–2
–3
0.2
0.1
100
0.5
0.6
2
1
+2
+3
%
%
%/V
%
%
Ω
Ω
MHz
A
%
%
%/V
%/V
%
dB
mA
µV
RMS
Conditions
Min
Typ
Max
Units
1.8
0.75
–2
–3
2.2
1.6
+2
+3
0.3
0.6
1.5
220
LOWQ = Low (Light Load Mode)
Output Voltage Accuracy
Variation from nominal V
OUT
Variation from nominal V
OUT
; –40°C to +125°C
Line Regulation
V
IN
= V
OUT
+ 1V to 5.5V; I
OUT
= 100µA
Load Regulation
Ripple Rejection
Current Limit
Output Voltage Noise
I
OUT
= 100µA to 50mA
f = up to 1kHz
V
OUT
= 0V
10Hz to 100KHz
0.02
0.4
45
120
53
80
February 2008
5
M9999-022008-C
微控制器 MCU
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