MIC23155
3MHz PWM 2A Buck Regulator with
HyperLight Load
®
and Power Good
General Description
The MIC23155 is a high efficiency 3MHz 2A synchronous
buck regulator with HyperLight Load
®
mode, Power Good
output indicator, and programmable soft start. HyperLight
Load
®
provides very high efficiency at light loads and ultra
fast transient response which makes the MIC23155
perfectly suited for supplying processor core voltages. An
additional benefit of this proprietary architecture is very low
output ripple voltage throughout the entire load range with
the use of small output capacitors. The tiny 2.5mm x
2.5mm Thin MLF
®
package saves precious board space
and requires only four external components.
The MIC23155 is designed for use with a very small
inductor, down to 0.47µH, and an output capacitor as small
as 2.2 µF that enables a total solution size, less than 1mm
in height.
The MIC23155 has a very low quiescent current of 22µA
and achieves a peak efficiency of 94% in continuous
conduction mode. In discontinuous conduction mode, the
MIC23155 can achieve 85% efficiency at 1mA.
The MIC23155 is available in a 10-pin 2.5mm x 2.5mm
Thin MLF
®
package with an operating junction temperature
range from –40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Input voltage: 2.7V to 5.5V
Output voltage: fixed or adjustable (down to 0.7V)
Up to 2A output current
Up to 94% peak efficiency
85% typical efficiency at 1mA
Power Good output
Programmable Soft Start
22µA typical quiescent current
3MHz PWM operation in continuous conduction mode
Ultra fast transient response
Active output discharge when disabled
Low output voltage ripple
Fully integrated MOSFET switches
0.01µA shutdown current
Thermal shutdown and current limit protection
10-pin 2.5mm x 2.5mm Thin MLF
®
–40°C to +125°C junction temperature range
Applications
•
•
•
•
•
•
Solid State Drives (SSD)
Smart phones
Tablet PCs
Mobile handsets
Portable devices (PMP, PND, UMPC)
WiFi/WiMax/WiBro applications
____________________________________________________________________________________________________________
Typical Application
Fixed Output Voltage
HyperLight Load is a registered trademark of Micrel, Inc.
MLF and
MicroLeadFrame
are registered trademarks Amkor Technology, Inc.
Adjustable Output Voltage
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 2011
M9999-041811-A
Micrel Inc.
MIC23155
Ordering Information
Part Number
MIC23155-GYMT
MIC23155YMT
Notes:
1. Other fixed output voltage options available. Contact Micrel Marketing for details.
2. Thin MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
3. Thin MLF®
▲
= Pin 1 identifier.
Marking
Code
QLG
QLA
Nominal Output
Voltage
1.8V
Adjustable
Junction
Temp. Range
–40°C to +125°C
–40°C to +125°C
Package
10-Pin 2.5mm x 2.5mm Thin MLF
®
10-Pin 2.5mm x 2.5mm Thin MLF
®
Pin Configuration
2.5mm x 2.5mm Thin MLF
®
(MT)
Fixed Output Voltage
(Top View)
2.5mm x 2.5mm Thin MLF
®
(MT)
Adjustable Output Voltage
(Top View)
Pin Description
Pin Number
(Fixed)
1
2
3
4
-
5
6
7
8,9
10
EPAD
Pin Number
(Adjustable)
1
2
3
-
4
5
6
7
8,9
10
EPAD
Pin Name
SW
EN
SNS
NC
FB
PG
SS
AGND
VIN
PGND
HS PAD
Output Switch Node
Enable: Logic high enables operation of the regulator. Logic low will shut
down the device. Do not leave floating.
Output voltage sensing pin. When disabled, provides output discharge.
Not internally connected.
Feedback connection for output voltage sensing
Power good indicator. Open drain output
Programmable soft start pin. Do not leave floating
Analog Ground. Ground path for bias and control circuitry.
Input Voltage Supply.
Power Ground. Ground path for high current circuitry
Exposed heat sink pad. Connect to PGND
Pin Function
April 2011
2
M9999-041811-A
Micrel Inc.
MIC23155
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ........................................... -0.3V to 6V
Sense Voltage (V
SNS
) .........................................-0.3V to V
IN
Output Switch Voltage (V
SW
) ..............................-0.3V to V
IN
Enable Input Voltage (V
EN
).. ..............................-0.3V to V
IN
Power Good Voltage (V
PG
).................................-0.3V to V
IN
Storage Temperature Range .. ……………-65°C to +150°C
Lead temperature (soldering, 10 sec.) ....................... 260°C
ESD Rating
(3)
................................................. ESD Sensitive
Operating Ratings
(2)
Supply Voltage (V
IN
)... …………………………..2.7V to 5.5V
Enable Input Voltage (V
EN
) .. ……………………….0V to V
IN
Sense Voltage (V
SNS
) .......................................... 0.7V to V
IN
Junction Temperature Range (T
J
)... ….-40°C
≤
T
J
≤
+125°C
Thermal Resistance
2.5mm x 2.5mm Thin MLF-10 (θ
JA
) ...................90°C/W
2.5mm x 2.5mm Thin MLF-10 (θ
JC
) ...................63°C/W
Electrical Characteristics
(4)
T
A
= 25°C; V
IN
= V
EN
= 3.6V; L = 1.0µH; C
OUT
= 4.7µF unless otherwise specified.
Bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Supply Voltage Range
Under Voltage Lockout Threshold
Under Voltage Lockout Hysteresis
Quiescent Current
Shutdown Current
Output Voltage Accuracy (Fixed)
Feedback Regulation Voltage
Feedback Bias Current
Current Limit
Output Voltage Line Regulation
Output Voltage Load Regulation
I
OUT
= 0mA , SNS > 1.2 * V
OUTNOM
V
EN
= 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
I
LOAD
= 20mA
I
FB
SNS = 0.9*V
OUTNOM
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
< 500mA, V
IN
= 3.6V if V
OUTNOM
< 2.5V
20mA < I
LOAD
< 500mA, V
IN
= 5.0V if V
OUTNOM
≥
2.5V
20mA < I
LOAD
< 1A, V
IN
= 3.6V if V
OUTNOM
< 2.5V
20mA < I
LOAD
< 1A, V
IN
= 5.0V if V
OUTNOM
≥
2.5V
I
SW
= 100mA PMOS
I
SW
= -100mA NMOS
I
OUT
= 180mA
V
OUT
= 90%, C
SS
= 470pF
V
SS
= 0V
85
Rising
2.2
Rising
Condition
Min.
2.7
2.45
2.55
75
22
0.01
-2.5
0.6045
0.62
1
3.3
0.3
0.3
0.7
0.20
0.19
3
320
2.7
91
7
68
165
Logic Low
Logic High
Enable Input Current
Output Discharge Resistance
Over-temperature Shutdown
Shutdown Hysteresis
EN=0V
1.2
0.1
165
160
20
2
0.5
95
45
5
+2.5
0.6355
Typ.
Max.
5.5
2.65
Units
V
V
mV
µA
µA
%
V
nA
A
%/V
%
%
Ω
MHz
µs
µA
%
%
µs
Ω
V
V
µA
Ω
°C
°C
M9999-041811-A
PWM Switch R
DSON
Switching Frequency
Soft Start Time
Soft Start Current
Power Good Threshold (Rising)
Power Good Threshold Hysteresis
Power Good Delay Time
Power Good Pull Down
Resistance
Enable Input Voltage
April 2011
3
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