MIC23250
4MHz Dual 400mA Synchronous Buck
Regulator with HyperLight Load™
General Description
Features
The MIC23250 is a high efficiency 4MHz dual 400mA
•
Input voltage: 2.7V to 5.5V
HyperLight Load™
synchronous buck regulator with HyperLight Load™ mode.
•
Dual output current 400mA/400mA
HyperLight Load™ provides very high efficiency at light
•
Up to 94% peak efficiency and 85% efficiency at 1mA
loads and ultra-fast transient response which is perfectly
•
33µA dual quiescent current
suited for supplying processor core voltages. An additional
•
1µH inductor with a 4.7µF capacitor
benefit of this proprietary architecture is very low output
•
4MHz in PWM operation
ripple voltage throughout the entire load range with the use
of small output capacitors. The fixed output MIC23250 has
•
Ultra fast transient response
a tiny 2mm x 2mm Thin MLF
®
package that saves
•
Low voltage output ripple
precious board space by requiring only 6 additional
•
20mVpp in HyperLight Load™ mode
external components to drive both outputs up to 400mA
•
3mV output voltage ripple in full PWM mode
each.
•
0.01µA shutdown current
The device is designed for use with a 1µH inductor and a
•
Fixed output:10-pin 2mm x 2mm Thin MLF®
4.7µF output capacitor that enables a sub-1mm height.
•
Adjustable output:12-pin 2.5mm x 2.5mm Thin MLF®
The MIC23250 has a very low quiescent current of 33µA
•
–40°C to +125°C junction temperature range
with both outputs enabled and can achieve over 85%
efficiency at 1mA. At higher loads the MIC23250 provides a
constant switching frequency around 4MHz while providing
Applications
peak efficiencies up to 94%.
•
Mobile handsets
The MIC23250 fixed output voltage option is available in a
•
Portable media players
10-pin 2mm x 2mm Thin MLF
®
. The adjustable output
•
Portable navigation devices (GPS)
options is available in a 12-pin 2.5mm x 2.5mm Thin MLF
®
.
•
WiFi/WiMax/WiBro modules
The MIC23250 is designed to operate over the junction
•
Digital cameras
operating range from –40°C to +125°C.
•
Wireless LAN cards
Data sheets and support documentation can be found on
•
USB Powered Devices
Micrel’s web site at: www.micrel.com.
____________________________________________________________________________________________________________
Typical Application
Efficiency V
OUT
= 1.8V
100
VIN = 3.0V
90
VIN = 2.7V
80
70
VIN = 4.2V
60
50
40
30
20
10
0
1
L = 1µH
C
OUT
= 4.7µF
10
100
1000
OUTPUT CURRENT (mA)
VIN = 3.6V
HyperLight Load is a 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
November 2008
M9999-111108-D
Micrel, Inc.
MIC23250
Ordering Information
Part Number
Marking
Code
WV3
WV2
WV4
WV5
WV1
5WV
4WV
Nominal
Output
Voltage 1
0.9V
1.2V
1.2V
1.2V
1.575V
2.6V
ADJ
Nominal
Output
Voltage 2
1.1V
1.0V
1.6V
1.8V
1.8V
3.3V
ADJ
Junction
Temp. Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
Lead
Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
MIC23250-3BYMT
MIC23250-C4YMT
MIC23250-W4YMT
MIC23250-G4YMT
MIC23250-GFHYMT
MIC23250-SKYMT
MIC23250-AAYMT
Notes:
1)
2)
10-Pin 2mm x 2mm Thin MLF
®
10-Pin 2mm x 2mm Thin MLF
®
10-Pin 2mm x 2mm Thin MLF
10-Pin 2mm x 2mm Thin MLF
®
®
®
10-Pin 2mm x 2mm Thin MLF
10-Pin 2mm x 2mm Thin MLF
®
12-Pin 2.5mm x 2.5mm Thin MLF
®
Additional voltage options available (0.8V to 3.3V). Contact Micrel for details.
Thin MLF is GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
®
November 2008
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M9999-111108-D
Micrel, Inc.
MIC23250
Pin Configuration
SNS1
EN1
AGND
SW1
PGND
1
2
3
4
5
10 SNS2
9
8
7
6
EN2
AVIN
SW2
VIN
FB1
SNS1
EN1
AGND
SW1
PGND
1
2
3
4
5
6
12 FB2
11 SNS2
10 EN2
9
8
7
AVIN
SW2
VIN
10-Pin 2mm x 2mm Thin MLF
®
(MT)
Fixed Output
(Top View)
12-Pin 2.5mmx2.5mm Thin MLF
®
(MT)
Adjustable Output
(Top View)
Pin Description
Pin Number
(Fixed)
Pin Number
(Adjustable)
Pin Name
Pin Function
–
1
2
3
4
5
6
7
8
9
10
–
1
2
3
4
5
6
7
8
9
10
11
12
FB1
SNS1
EN1
AGND
SW1
PGND
VIN
SW2
AVIN
EN2
SNS2
FB2
Feedback VOUT1 (Input): Connect resistor divider at this node to set output
voltage. Resistors should be selected based on a nominal VFB of 0.72V.
Sense 1 (Input): Error amplifier input. Connect to feedback resistor network
to set output 1 voltage.
Enable 1 (Input): Logic low will shut down output 1. Logic high powers up
output 1. Do not leave unconnected.
Analog Ground. Must be connected externally to PGND.
Switch Node 1 (Output): Internal power MOSFET output.
Power Ground.
Supply Voltage (Power Input): Requires close bypass capacitor to PGND.
Switch Node 2 (Output): Internal power MOSFET output.
Supply Voltage (Power Input): Analog control circuitry. Connect to VIN.
Enable 2 (Input): Logic low will shut down output 2. Logic high powers up
output 2. Do not leave unconnected.
Sense 2 (Input): Error amplifier input. Connect to feedback resistor network
to set output 2 voltage.
Feedback VOUT2 (Input): Connect resistor divider at this node to set output
voltage. Resistors should be selected based on a nominal VFB of 0.72V.
November 2008
3
M9999-111108-D
Micrel, Inc.
MIC23250
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .........................................................6V
Output Switch Voltage (V
SW
) ............................................6V
Logic Input Voltage (V
EN1
, V
EN2
) ........................ –0.3V to V
IN
Storage Temperature Range (T
s
)..............–65°C to +150°C
ESD Rating
(3)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
)......................................... 2.7V to 5.5V
Logic Input Voltage (V
EN1
, V
EN2
) ............................. 0V to V
IN
Junction Temperature (T
J
) ..................–40°C
≤
T
J
≤
+125°C
Thermal Resistance
2mm x 2mm Thin MLF-10 (θ
JA
) .........................70°C/W
2.5mm x 2.5mm Thin MLF-12 (θ
JA
) ...................65°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
IN
= V
EN1
= V
EN2
= 3.6V; L = 1µH; C
OUT
= 4.7µF; I
OUT
= 20mA; only one channel power is enabled, unless
otherwise specified.
Bold
values indicate –40°C< T
J
< +125°C.
Parameter
Condition
Min
Typ
Max
Units
Under-Voltage Lockout Threshold
UVLO Hysteresis
Quiescent Current
Shutdown Current
Output Voltage Accuracy
Feedback Voltage (Adj only)
Current Limit in PWM Mode
Output Voltage Line Regulation
Output Voltage Load Regulation
(turn-on)
V
OUT1, 2 (both Enabled)
, I
OUT1, 2
= 0mA , V
SNS1,2
>1.2 * V
OUT1, 2
Nominal
V
EN1, 2
= 0V; V
IN
= 5.5V
V
IN
= 3.6V if V
OUTNOM
< 2.5V, I
LOAD
= 20mA
V
IN
= 4.5V if V
OUTNOM
≥
2.5V, I
LOAD
= 20mA
SNS = 0.9*V
OUT NOM
V
IN
= 3.6V to 5.5V if V
OUTNOM
< 2.5V, I
LOAD
= 20mA
V
IN
= 4.5V to 5.5V if V
OUTNOM
≥
2.5V, I
LOAD
= 20mA
20mA < I
LOAD
< 400mA, V
IN
= 3.6V if V
OUTNOM
< 2.5V
20mA < I
LOAD
< 400mA, V
IN
= 5.0V if V
OUTNOM
≥
2.5V
I
SW
= 100mA PMOS
I
SW
= -100mA NMOS
I
LOAD
= 120mA
V
OUT
= 90%
2.45
2.55
60
33
0.01
2.65
50
4
+2.5
+2.5
1
V
mV
µA
µA
%
%
V
A
%/V
%/V
%
%
Ω
Ω
MHz
µs
V
µA
°
C
°
C
–2.5
–2.5
0.410
PWM Switch ON-Resistance
Frequency
Soft Start Time
Enable Threshold
Enable Input Current
Over-temperature Shutdown
Over-temperature Shutdown
Hysteresis
0.5
0.720
0.65
0.4
0.4
0.5
0.5
0.6
0.8
4
260
0.8
0.1
160
40
1.2
2
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.
November 2008
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M9999-111108-D
Micrel, Inc.
MIC23250
Typical Characteristics
50
45
40
35
30
25
20
15
10
5
L = 1µH
C
OUT
= 4.7µF
0.01
1
1
Quiescent Current
vs. Input Voltage
10
4MHz
Switching Frequency
vs. Output Current
10
4MHz
Switching Frequency
vs. Output Current
L = 4.7µH
V
IN
= 3.0V
1
L = 1µH
0.1
V
IN
= 4.2V
V
OUT
= 1.8V
L = 1µH
C
OUT
= 4.7µF
L = 2.2µH
0.1
V
IN
= 3.6V
V
OUT
= 1.8V
C
OUT
= 4.7µF
10
100
1000
OUTPUT CURRENT (mA)
0
2.7 3.2 3.7 4.2 4.7 5.2 5.7
INPUT VOLTAGE (V)
V
IN
= 3.6V
10
100
1000
OUTPUT CURRENT (mA)
0.01
1
5.0
Frequency
vs. Temperature
1.90
1.88
1.86
1.84
1.82
1.80
1.78
1.76
1.74
1.72
1.70
1
Output Voltage
vs. Output Current
4.5
VIN = 3.0V
VIN = 4.2V
VIN = 3.6V
L = 1µH
1.88
C
OUT
= 4.7µF
1.86
1.84
1.82
1.80
Load = 10mA
1.90
Output Voltage
vs. Input Voltage
Load = 1mA
4.0
3.5
3.0
L = 1µH
C
OUT
= 4.7µF
Load = 120mA
20 40 60 80
TEMPERATURE (°C)
1.78
Load = 300mA
1.76
Load = 50mA
Load = 400mA
1.74
Load = 150mA
10
100
1000
OUTPUT CURRENT (mA)
1.72
1.70
2.7 3.2 3.7 4.2 4.7 5.2 5.7
INPUT VOLTAGE (V)
1.9
Output Voltage
vs. Temperature
VOUT2 = 1.8V
1.2
Enable Threshold
vs. Temperature
1.000
0.975
Enable Threshold
vs. Input Voltage
1.0
VIN = 3.6V
0.8
VIN = 2.7V
1.8
VIN = 5.5V
0.950
0.925
0.900
0.875
0.850
Enable ON
Enable OFF
1.7
L = 1µH
C
OUT
= 4.7µF
Load = 120mA
VOUT1 = 1.575V
0.6
0.4
0.2
L = 1µH
C
OUT
= 4.7µF
20 40 60 80
TEMPERATURE (°C)
1.6
0.825
1.5
20 40 60 80
TEMPERATURE (°C)
0
0.800
2.7 3.2 3.7 4.2 4.7 5.2 5.7
INPUT VOLTAGE (V)
V
IN
= 3.6V
V
OUT
= 1.8V
Load = 150mA
700
Current Limit
vs. Input Voltage
Efficiency V
OUT
= 1.2V
100
VIN = 3.0V
90
VIN = 2.7V
80
70
VIN = 3.6V
60
VIN = 4.2V
50
40
30
100
Efficiency V
OUT
= 1.575V
90
VIN = 2.7V
80
70
VIN = 4.2V
60
50
40
30
20
10
0
1
VIN = 3.0V
650
VIN = 3.6V
600
L = 1µH
C
OUT
= 4.7µF
5.7
20
10
0
1
550
2.7 3.2 3.7 4.2 4.7 5.2
INPUT VOLTAGE (V)
L = 1µH
C
OUT
= 4.7µF
10
100
1000
OUTPUT CURRENT (mA)
L = 1µH
C
OUT
= 4.7µF
10
100
1000
OUTPUT CURRENT (mA)
November 2008
5
M9999-111108-D
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