MIC2230
Dual Synchronous 800mA/800mA
Step-Down DC/DC Regulator
General Description
The MIC2230 is dual output, high-efficiency synchronous
step-down DC/DC converter. The MIC2230 is ideally
suited for portable systems which demand high power
conversion efficiencies and fast transient performance,
while offered in a very small package. The MIC2230 offers
an ultra-low quiescent current in light load mode assuring
minimum current draw from battery powered applications
in standby modes. The MIC2230 was designed to only
require miniature 2.2µH inductors and 10µF ceramic
capacitors.
The MIC2230 features a selectable mode that allows the
user to trade-off lowest noise performance for low power
efficiency. Trickle Mode
TM
operation provides ultra-high
efficiency at light loads, while PWM operation provides
very low ripple noise performance. To maximize battery life
in low-dropout conditions, MIC2230 can operate with a
maximum duty cycle of 100%.
The MIC2230 is available in a space-saving 3mm × 3mm
MLF
®
-12L package with a junction temperature range from
–40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
High Efficiency: Over 96%
Ultra-low quiescent current: Only 28µA
Ultra-low shutdown current less than 1µA
Fast transient performance
2.5MHz PWM operation
High output current capability per channel: 800mA
No Schottky Diodes Required
Stable with 2.2µH inductor, 10µF ceramic capacitor
Adjustable output voltage down to 0.8V
Built-in soft-start circuitry
Current limit protection
Automatic switching into light load mode operation
/FPWM pin allows low noise all-PWM mode operation
Power good output with internal 5µA current source
allows sequencing with programmable delay time
•
Small Thermally Enhanced 3mm × 3mm MLF
®
package
Applications
•
Cellular phones
•
PDAs
•
Digital Cameras
•
MP3 Players
•
PC Cards
•
Wireless and DSL Modems
___________________________________________________________________________________________________________
Typical Application
MLF and
MicroLead
Frame 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
March 2008
M9999-032808
Micrel, Inc.
MIC2230
Ordering Information
Part Number
MIC2230-AAYML
MIC2230-521YML
MIC2230-G4YML
MIC2230-GF9YML
MIC2230-GFHYML
MIC2230-GSYML
MIC2230-GWYML
MIC2230-J4YML
MIC2230-S4YML
MIC2230-SSYML
Note:
Other voltages available. Contact Micrel Marketing for details.
V
OUT1
Adj.
1.28V
1.8V
1.8V
1.8V
1.8V
1.8V
2.5V
3.3V
3.3V
V
OUT2
Adj.
1.65V
1.2V
1.545V
1.575V
3.3V
1.6V
1.2V
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
–40°C to +125°C
–40°C to +125°C
Package
12-Pin 3mm x 3mm MLF
®
12-Pin 3mm x 3mm MLF
®
12-Pin 3mm x 3mm MLF
®
12-Pin 3mm x 3mm MLF
®
12-Pin 3mm x 3mm MLF
12-Pin 3mm x 3mm MLF
®
®
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
12-Pin 3mm x 3mm MLF
®
12-Pin 3mm x 3mm MLF
®
12-Pin 3mm x 3mm MLF
®
12-Pin 3mm x 3mm MLF
®
Pin Configuration
Adjustable
MIC2230-AAYML
®
12-Pin MLF (ML)
(Top View)
Fixed
MIC2230-xxYML
12-Pin MLF
®
(ML)
(Top View)
March 2008
2
M9999-032808
Micrel, Inc.
MIC2230
Pin Description
Pin Number
Adjustable
1
Pin Number
Fixed
–
FB2
Feedback 2: For adjustable voltage options connect the
external resistor divider network to FB2 to set the output
voltage of regulator 2. Nominal value is 0.8V.
Enable 2 input. Logic low powers down regulator 2. Logic
high powers up regulator 2. MIC2230 features built-in soft-
start circuitry that reduces in-rush current and prevents the
output voltage from overshooting at start up.
Analog Supply Voltage: Supply voltage for the analog control
circuitry. Requires bypass capacitor to GND.
Switch node for regulator 2, connected to external inductor.
Analog (signal) ground.
Power ground.
Forced PWM Mode Bar. Grounding this pin forces the device
to stay in constant frequency PWM mode only. Pulling this
pin high enables automatic Trickle Mode
TM
operation.
Switch node for regulator 1, connected to external inductor.
Supply Voltage: Supply voltage for the internal switches and
drivers.
Power Good Output. This output is pulled down unless the
regulator 1 output voltage is within +6.25% and -8.5% of
regulation. After the output voltage is in regulation, the output
starts to go high with an internal 5µA current source. A delay
time could be programmed by tying a capacitor to this pin.
Enable 1 input. Logic low powers down regulator 1. Logic
high powers up regulator 1. MIC2230 features built-in soft-
start circuitry that reduces in-rush current and prevents the
output voltage from overshooting at start up.
Feedback 1: For adjustable voltage options connect to the
external resistor divider network to FB1 to set the output
voltage of regulator 1. Nominal value is 0.8V.
Output Voltage 2. For fixed output voltage options connect
OUT2 to the output voltage of regulator 2.
Output Voltage 1. For fixed output voltage options connect
OUT1 to the output voltage of regulator 1.
Back-side pad.
Pin Name
Pin Name
2
2
EN2
3
4
5
6
7
8
9
3
4
5
6
7
8
9
AVIN
SW2
AGND
PGND
/FPWM
SW1
VIN
10
10
PGOOD
11
11
EN1
12
–
–
EP
–
1
12
EP
FB1
OUT2
OUT1
EP
March 2008
3
M9999-032808
Micrel, Inc.
MIC2230
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .......................................................+6V
Enable 1 Voltage ………………………………………... +6V
Enable 2 Voltage ……………………………………….. +6V
Logic Input Voltage (V
EN
, V
FPWM
)............................ 0V to V
IN
Storage Temperature (T
S
) ........................–65°C to +150°C
ESD .............................................................................. 2KV
Operating Ratings
(2)
Supply Voltage (V
IN
) ........................................ 2.5V to 5.5V
Junction Temperature (T
J
) ........................ –40°C to +125°C
Package Thermal Resistance (θ
JA
) ..........................60°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
IN
= V
EN1
= V
EN2
=3.6V, V
OUT1
, V
OUT2
, L= 2.2µH, C = 10µF, unless otherwise specified.
Bold
values indicate –40ºC
≤
T
J
≤
+125ºC.
Parameter
Condition
Min
Typ
Max
Units
Supply Voltage and Current
Supply Voltage Range
UVLO (rising)
UVLO Hysteresis
PWM Mode Supply
Current
Trickle Mode
TM
Supply
Current
Shutdown Quiescent
Current
Output Voltage Accuracy
Feedback voltage, V
FB
Output voltage, V
OUT
Feedback bias current
Output Voltage Line
Regulation
Output Voltage Load
Regulation
Ripple in Trickle Mode
TM
Logic Inputs
EN Input Threshold
EN Input Current
/FPWM Input Threshold
On
Off
/FPWM Input Current
0.3×V
IN
2.5
2.3
2.4
100
/FPWM = Low, I
OUT
= 200mA
/FPWM = High
V
EN
= 0V
560
28
0.1
5.5
2.5
V
V
mV
950
50
1
µA
µA
µA
Adjustable
Fixed Output Options
0.780
-2.5
0.8
0.820
+2.5
V
%
nA
10
2.5V
≤
V
IN
≤
5.5V
V
IN
= 5V, I
OUT
= 10mA to 800mA, /FPWM = 0V
V
IN
= 3V; I
OUT
= 10mA to 800mA, /FPWM = 0V
V
IN
=3.6V; I
OUT
= 1mA; C
OUT
= 10µF, L = 2.2µH.
On
Off
0.3
0.1
0.5
%
0.5
40
0.8
0.7
0.01
1
0.6×V
IN
%
mV
V
V
µA
V
V
1.2
0.01
1
µA
March 2008
4
M9999-032808
Micrel, Inc.
MIC2230
Electrical Characteristics (cont.)
(4)
Parameter
Protection
Current Limit
Control
Maximum Duty Cycle
Oscillator
PWM Mode Frequency
Power Good
Power Good Reset
Threshold
PGOOD Series
Resistance
PGOOD Pull-Up Current
Power Switch
Switch On-Resistance
I
SW
= 150mA (PFET)
I
SW
= 150mA (NFET)
0.4
0.35
Ω
Output within 8.5% of regulation
Upper Threshold
Lower Threshold
-14
6.25
-8.5
1
5
12
%
kΩ
µA
2.125
2.5
2.875
MHz
V
FB
= 0.7V
100
%
Peak Switch Current, V
OUT
= 0V
0.9
1.2
1.8
A
Condition
Min
Typ
Max
Units
1.4
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
March 2008
5
M9999-032808
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