MIC23156
1.5A, 3MHz Synchronous Buck Regulator
with HyperLight Load
®
and I
2
C Control for
Dynamic Voltage Scaling
General Description
The MIC23156 is a high-efficiency 1.5A synchronous buck
®
regulator with HyperLight Load mode and dynamic
2
voltage scaling control through I C. HyperLight Load
provides very high efficiency at light loads and ultra-fast
transient response. The ability to dynamically change the
output voltage and maintain high output voltage accuracy
make the MIC23156 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
2
output capacitors. Fast mode plus I C provides output
2
voltage and chip enable/disable control from standard I C
2
bus with I C clock rates of 100kHz, 400kHz, and 1MHz.
The MIC23156 is designed for use with 1µH, and an
output capacitor as small as 2.2µF that enables a total
solution size, less than 1mm in height.
The MIC23156 is available in both 16-ball, 0.4mm Pitch,
1.81mm x 1.71mm wafer level chip scale (WLCSP), and
®
17-pin 2.8mm x 2.5mm MLF packages with an operating
junction temperature range of –40°C to +125°C.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
•
Input voltage: 2.7V to 5.5V
•
Up to 1.5A output current
2
•
1MHz I C-controlled adjustable output
−
V
OUT
= 0.7 to 2.4V in 10mV steps
•
High output voltage accuracy (±1.5% over temperature)
•
Fast pin–selectable output voltage
•
Programmable soft-start using external capacitor
•
Ultra-low quiescent current of 30µA when not switching
•
Thermal-shutdown and current-limit protection
•
Safe startup in to pre-biased output
•
Stable with 1µH output inductor and 2.2µF ceramic
capacitor
•
Up to 93% peak efficiency
• −40°C
to +125°C junction temperature range
Applications
•
•
•
•
Mobile handsets
Solid state drives (SSD)
WiFi/WiMx/WiBro modules
Portable applications
Typical Application
HyperLight Load is a registered trademark of Micrel, Inc.
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
April 22, 2013
Revision 1.0
Micrel, Inc.
MIC23156
Ordering Information
Part Number
MIC23156-0YCS
MIC23156-0YML
Note:
1. MLF is a Green, RoHS-compliant package. Lead finish is NiPdAu. Mold is Halogen free..
Marking
Code
JA
JQA
Default Output Voltage
VSEL = LOW
1.0V
VSEL = HIGH
0.8V
Junction
Temperature Range
–40°C to +125°C
Package
16-Ball 1.81mm × 1.71mm WLCSP
17-Pin 2.8mm × 2.5mm MLF
(1)
Pin Configuration
1.81mm × 1.71mm WLCSP (CS) Adjustable Output Voltage
(Top View)
2.8mm × 2.5mm MLF (ML) Adjustable Output Voltage
(Top View)
April 22, 2013
2
Revision 1.0
Micrel, Inc.
MIC23156
Pin Description
Ball
Number
WLCSP
A1
A2
A3
A4
B1
B2
B3
B4
C1, C2
C3, D3
C4
D1, D2
D4
−
Pin
Number
MLF
2
3
4
5
1
11
7
8
16, 17
12, 13
9
14, 15
10
6
Pin
Name
Pin Function
SCL
SDA
SNS
SS
VI2C
VSEL
PGOOD
AVIN
SW
PVIN
AGND
PGND
EN
NC
Fast-Mode Plus 1MHz I²C Clock Input Pin.
Fast-Mode Plus 1MHz I²C Data Input/Output Pin.
Sense: Connect to V
OUT
, close to output cap to sense V
OUT
.
Programmable Soft Start: Connect capacitor to AGND.
Power Connection for I C Bus Voltage: Connect this pin to the voltage domain of the I C bus
supply. Do not leave floating.
Pin Selectable: Output voltage of either of two I C voltage registers. Do not leave floating.
Power Good Indicator: Use an external pull-up resistor to supply.
Input Voltage to Power Analog Functions: Connect decoupling capacitor to ground.
Switch Connection: Internal power MOSFET output switches.
Input Voltage to Power Switches: Connect decoupling capacitor to ground.
Analog Ground: Connect to central ground point where all high-current paths meet (C
IN
, C
OUT
,
and PGND) for best operation.
Power Ground Connection.
Enable: Logic high enables operation of voltage regulator. Logic low shuts down the device. Do
not leave floating.
No Connect.
2
2
2
April 22, 2013
3
Revision 1.0
Micrel, Inc.
MIC23156
Absolute Maximum Ratings
(1)
Input Supply Voltage (AVIN, PVIN, VI2C) .......
−0.3V
to +6V
Switch Voltage (SW) .....................................
−0.3V
to AVIN
Logic Voltage (EN, PGOOD).........................
−0.3V
to AVIN
Logic Voltage (VSEL, SCL, SDA) ..................
−0.3V
to VI2C
Analog Input Voltage (SNS, SS) ...................
−0.3V
to AVIN
Power Dissipation (T
A
= +70°C) ................ Internally Limited
Storage Temperature (T
S
) .........................
−65°C
to +150°C
Lead Temperature (soldering, 10s) .......................... +260°C
(3)
ESD Rating .................................................................. 2kV
Operating Ratings
(2)
Input Supply Voltage (AVIN, PVIN, VI2C).... +2.7V to +5.5V
Switch Voltage (SW) .......................................... 0V to AVIN
Logic Voltage (EN, PGOOD) ............................. 0V to AVIN
Logic Voltage (VSEL, SCL, SDA) ....................... 0V to VI2C
Analog Input Voltage (SNS, SS) ........................ 0V to AVIN
Junction Temperature Range (T
J
).......–40°C ≤ T
J
≤ +125°C
Thermal Resistance
1.81mm × 1.71mm WLCSP-16 (θ
JA
) ............... 150°C/W
2.8mm × 2.5mm MLF-17 (θ
JA
) ........................... 89°C/W
Electrical Characteristics
(4)
T
A
= 25°C, AVIN = PVIN = V
EN
= V
VI2C
= 3.6V; L = 1.0µH; C
OUT
= 2.2µF, unless otherwise specified.
Bold
values indicate –40°C ≤ T
J
≤ +125°C, unless noted.
Parameter
Supply Voltage Range
Enable Logic Pin Low Threshold
Enable Logic Pin High Threshold
VSEL Logic Pin Low Threshold
VSEL Logic Pin High Threshold
Logic Pin Input Current
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Shutdown Temperature
Shutdown Temperature Hysteresis
Shutdown Current
DC-to-DC Converter
Output Voltage Accuracy
Quiescent Current
Output Voltage Range
Output Voltage Line Regulation
Output Voltage Load Regulation
Notes:
1. Exceeding the absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating ratings.
3. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5k in series with 100pF.
4. Specification for packaged product only.
Condition
Min.
2.7
Typ.
Max.
5.5
0.5
Units
V
V
V
Logic Low
Logic High
Logic Low
Logic High
Pins: EN and VSEL
Rising
Falling
2.45
0.7 × VI2C
0.1
2.55
75
160
20
V
EN
= 0V
−1.5
30
0.7
3.0V < V
AVIN
< 4.5, I
LOAD
= 10mA
20mA < I
OUT
< 1A
0.02
0.04
0.1
1.2
0.3 × VI2C
V
V
2
2.65
µA
V
mV
°C
°C
5
µA
V
OUT
= 1V, I
OUT
= 10mA
I
OUT
= 0mA, V
FB
> 1.2*V
OUT
+1.5
50
2.4
%
µA
V
%/V
%
April 22, 2013
4
Revision 1.0
Micrel, Inc.
MIC23156
Electrical Characteristics
(4)
(Continued)
T
A
= 25°C, AVIN = PVIN = V
EN
= V
VI2C
= 3.6V; L = 1.0µH; C
OUT
= 2.2µF, unless otherwise specified.
Bold
values indicate –40°C ≤ T
J
≤ +125°C, unless noted.
Parameter
Condition
I
SW
= +100mA, High-Side Switch PMOS (MLF)
I
SW
= +100mA, High-Side Switch PMOS (WLCSP)
I
SW
=
−100mA,
Low-Side Switch NMOS (MLF)
I
SW
=
−100mA,
Low-Side Switch NMOS (WLCSP)
Current Limit (DC Value)
Frequency
Maximum Duty Cycle
DVS Step Size
Soft-Start Time
2
Min.
Typ.
0.17
0.15
0.15
0.13
Max.
Units
Switch On-Resistance
Ω
V
OUT
= 1V
1.7
2.9
3
5.1
A
MHz
%
Frequency = 3MHz
80
10
mV
µs
V
OUT
= 90%, C
SS
= 120pF
250
I C Interface (Assuming 550pF Total Bus Capacitance)
I C Address
LOW-Level Input Voltage
HIGH-Level Input Voltage
SDA Pull-Down Resistance
Power Good
PGOOD Output Low
PGOOD Output Leakage
PGOOD Threshold
% of V
OUT
< V
NOM
PGOOD hysteresis
V
OUT
< 80% V
NOM
, I
PGOOD
=
−500µA
V
OUT
= V
NOM
V
OUT
ramping up
86
5
100
5
96
mV
µA
%
%
2
Read (Binary, Hex)
Write (Binary, Hex)
SCL, SDA
SCL, SDA
Open drain pull-down on SDA during read back,
I
SDA
= 500µA
10110111, 0xB7
10110110, 0xB6
0.3 × VI2C
0.7 × VI2C
20
V
V
Ω
April 22, 2013
5
Revision 1.0
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