MIC2800
Digital Power Management IC
2MHz, 600mA DC/DC w/Dual
300mA/300mA Low V
IN
LDOs
General Description
The MIC2800 is a high performance power management
IC, giving three output voltages with maximum efficiency.
Integrating a 2MHz DC/DC converter with an LDO post
regulator, the MIC2800 gives two high efficiency outputs
with a second, 300mA LDO for maximum flexibility. The
MIC2800 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 to DC converter
is 75µV
RMS
, significantly lower than other converters which
use a PFM light load mode that can interfere with sensitive
RF circuitry.
The DC to DC converter uses small values of L and C to
reduce board space but still retains efficiencies over 90%
at load currents up to 600mA.
The MIC2800 is 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 x 3mm MLF
®
leadless package.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
•
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
DC to DC Converter
•
Output current to 600mA in PWM mode
•
LOWQ
®
Mode: NO NOISE Light load mode
–
75µV
RMS
output noise in LOWQ
®
mode
•
2MHz PWM operation in normal mode
•
>90% efficiency
LDOs
•
LDO1 input voltage directly connected to DC/DC
converter output voltage for maximum efficiency
–
Ideal for 1.8V to 1.5V conversion
–
300mA output current from 1.8V input
–
Output voltage down to 0.8V
•
LDO2 – 300mA output current capable
•
Thermal Shutdown Protection
•
Current Limit Protection
Applications
•
•
•
•
•
Mobile phones
PDAs
GPS receivers
Digital still cameras
Portable media players
Features
•
2.7V to 5.5V input voltage range
•
2MHz DC/DC converter and two stand-alone LDOs
–
LDO1: Low input voltage is powered directly from
DC/DC converter for highest efficiency
Typical Application
DC/DC 1.8V
OUT
Efficiency
MIC2800-xxxYML
V
IN
2.7V to 5.5V
4.7µF/
6.3V
100
V
OUT
2.2µH
2.2µF
ceramic
VIN
VIN
EN1
LOWQ
EN2
C
BYP
C
BIAS
PGND
C
BIAS
0.1µF
LDO
SW
FB
LDO1
LDO2
POR
C
SET
SGND
C
SET
0.01µF
Memory/DSP
Baseband
C
OUT2
2.2µF
ceramic
C
OUT1
2.2µF
ceramic
C
BYP
0.01µF
95
3.6V
3V
90
85
4.2V
80
75
70
65
60
L = 2.2µH
C
OUT
= 2.2µF
55
/LowQ = V
IN
50
0 100 200 300 400 500 600
OUTPUT CURRENT (mA)
GND
GND
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
September 2007
M9999-090507-C
Micrel, Inc.
MIC2800
Ordering Information
Part number
MIC2800-1.8/1.2/2.5YML
MIC2800-1.8/1.2/2.6YML
MIC2800-1.8/1.2/2.8YML
MIC2800-1.8/1.2/3.3YML
MIC2800-1.8/1.58/3.3YML
MIC2800-1.87/1.2/2.8YML
MIC2800-1.8/1.5/2.8YML
MIC2800-Adj/1.2/3.3YML
Notes:
Other voltage options available. Please contact Micrel for details. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold
compound is Halogen Free.
DC/DC – Fixed Output Voltages (Range of 1.0V to 2.0V). Adjustable output voltage is available upon request.
LDO1 – Output Voltage Range of 0.8V to V
DC/DC
- V
DO.
LDO2 – Output Voltage Range of 0.8V to 3.6V.
®
Manufacturing
Part Number
MIC2800-G4JYML
MIC2800-G4KYML
MIC2800-G4MYML
MIC2800-G4SYML
MIC2800-G7SYML
MIC2800-D24MYML
MIC2800-GFMYML
MIC2800-A4SYML
Voltage
1.8V/1.2V/2.5V
1.8V/1.2V/2.6V
1.8V/1.2V/2.8V
1.8V/1.2V/3.3V
1.8V/1.58V/3.3V
1.87V/1.2V/2.8V
1.8V/1.5V/2.8V
Adj/1.2V/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
Package
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
16-Pin 3x3 MLF
®
September 2007
2
M9999-090507-C
Micrel, Inc.
MIC2800
Pin Configuration
®
3mm x 3mm MLF (ML)
Fixed DC/DC Converter Output Voltage
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
V
IN
V
IN
LDO2
FB
LDO
LDO1
POR
C
SET
C
BYP
EN1
EN2
Pin Function
LOWQ Mode. Active Low Input. Logic High = Full Power 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 (Output): Internal power MOSFET output switches.
Supply Input – DC/DC. Must be tied to PIN7 externally.
Supply Input – LDO2. Must be tied to PIN6 externally.
Output of regulator 2
Feedback. Input to the error amplifier for DC to DC converter.
adjust version, co
For fixed output voltages connect to V
OUT
and an internal resistor network sets the
output voltage
LDO Output: Connect to V
OUT
of the DC/DC for LOWQ mode operation.
Output of regulator 1
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.
Reference Bypass: Connect external 0.1µF to GND to reduce output noise. May be
left open.
Enable Input (DC/DC and LDO1). 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
September 2007
3
M9999-090507-C
Micrel, Inc.
MIC2800
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................. 0V to +6V
Enable Input Voltage (V
EN
)................................... 0V to +6V
LOWQ Mode (V
LOWQ
). .......................................... 0V to +6V
Power Dissipation, Internally Limited
(3)
Lead Temperature (soldering, 10 sec.)...................... 260°C
Storage Temperature (T
s
) .........................–65°C to +150°C
EDS Rating
(4)
.................................................................. 2kV
Operating Ratings
(2)
Supply voltage (V
IN
) ..................................... +2.7V to +5.5V
Enable Input Voltage (V
EN
)..................................... 0V to V
IN
LOWQ Mode (V
LOWQ
). ............................................ 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Junction Thermal Resistance
MLF-16 (θ
JA
) ......................................................45°C/W
Electrical Characteristics
(5)
V
IN
= EN1 = EN2 = LOWQ = V
OUT
(6)
+ 1V; C
OUTDC/DC
= 2.2µF, C
OUT1
= C
OUT2
= 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);
LDO2 Only (EN1 = LOW)
Ground Pin Current in
Shutdown
Ground Pin Current
(LOWQ mode)
All EN = 0V
I
DC/DC
< I
LDO1
< I
LDO2
< 10mA
DC/DC and LDO1 OFF; I
LDO2
< 10mA
Over-temperature Shutdown
Over-temperature Shutdown
Hysteresis
Enable Inputs (EN1; EN2;
/LOWQ
)
Enable Input Voltage
Logic Low
Logic High
Enable Input Current
V
IL
< 0.2V
V
IH
> 1.0V
Turn-on Time (See Timing Diagram)
Turn-on Time
EN2=V
IN
(LDO1 and LDO2)
EN1=V
IN
Turn-on Time (DC/DC)
EN2=V
IN
; I
LOAD
= 300mA; C
BYP
= 0.1µF
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
30
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
120
83
90
91
96
10
0.01
0.75
1.25
1.25
99
100
1
1.75
1
1
500
350
350
V
V
µA
µA
µs
µs
µs
%
%
mV
µA
µA
V
September 2007
4
M9999-090507-C
Micrel, Inc.
MIC2800
Electrical Characteristics - DC/DC Converter
V
IN
= V
OUTDC/DC
+ 1; EN1 = V
IN
; EN2 = 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
Current Limit in PWM Mode
FB pin input current (ADJ only)
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
PWM Switch ON-Resistance
Oscillator Frequency
Output Voltage Noise
C
OUT
= 2.2µF; C
BYP
= 0.1µF; 10Hz to 100KHz
-2.0
-3.0
40
0.02
0.2
55
45
120
0.3
0.6
1.5
LOWQ = Low (Light Load Mode)
Output Voltage Accuracy
Variation from nominal V
OUT
Variation from nominal V
OUT
; -40°C to +125°C
Output Voltage Temp.
Coefficient
Line Regulation
V
IN
= V
OUT
+ 1V to 5.5V; I
OUT
= 100µA
Load Regulation
Ripple Rejection
Current Limit
I
OUT
= 100µA to 50mA
f = up to 1kHz; C
OUT
= 2.2µF; C
BYP
= 0.1µF
f = 20kHz; C
OUT
= 2.2µF; C
BYP
= 0.1µF
V
OUT
= 0V
Nominal V
OUT
tolerance
V
FB
= 0.9*V
NOM
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
< 300mA
V
FB
≤
0.4V
I
SW
= 150mA V
FB
= 0.7V
FB_NOM
I
SW
= -150mA V
FB
= 1.1V
FB_NOM
-2
-3
0.75
+2
+3
1.6
5
%
%
A
nA
%/V
%/V
%
%
Ω
Ω
MHz
µV
RMS
+2.0
+3.0
%
%
ppm/C
%/V
%/V
%
dB
dB
mA
Conditions
Min
Typ
Max
Units
1
1
0.2
0.2
1.5
100
0.6
0.8
2
60
1.8
2.2
80
190
September 2007
5
M9999-090507-C
分立器件
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