MIC23158/9
3MHz PWM Dual 2A Buck Regulator with
HyperLight Load
and Power Good
General Description
The MIC23158/9 is a high-efficiency, 3MHz, dual, 2A
synchronous buck regulator with HyperLight Load
mode,
power good output indicator, and programmable soft start.
The MIC23159 also provides an auto discharge feature
that switches in a 225Ω pull down circuit on its output to
discharge the output capacitor when disabled. HyperLight
Load provides very high efficiency at light loads and ultra-
fast transient response which makes the MIC23158/9
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 20-pin 3mm x 4mm
®
MLF package saves precious board space and requires
seven external components for each channel.
The MIC23158/9 is designed for use with a very small
inductor, down to 0.47µH, and an output capacitor as small
as 2.2µF that enables a total solution size, less than 1mm
in height.
The MIC23158/9 has a very low quiescent current of 45µA
and achieves a peak efficiency of 94% in continuous
conduction mode. In discontinuous conduction mode, the
MIC23158/9 can achieve 83% efficiency at 1mA.
The MIC23158/9 is available in a 20-pin 3mm x 4mm 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
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
2.7V to 5.5V input voltage
Adjustable output voltage (down to 1.0V)
2 independent 2A outputs
Up to 94% peak efficiency
83% typical efficiency at 1mA
2 independent power good indicators
Independent programmable soft start
45µA typical quiescent current
3MHz PWM operation in continuous conduction mode
Ultra-fast transient response
Fully-integrated MOSFET switches
Output pre-bias safe
0.1µA shutdown current
Thermal-shutdown and current-limit protection
20-pin 3mm x 4mm MLF package
Internal 225Ω pull-down circuit on output (MIC23159)
–40°C to +125°C junction temperature range
Applications
•
Solid State Drives (SSD)
•
Smart phones
•
Tablet PCs
•
Mobile handsets
•
Portable devices (PMP, PND, UMPC, GPS)
•
WiFi/WiMax/WiBro applications
_______________________________________________________________________________________________________
Typical Application
HyperLight Load is a registered trademark of Micrel, Inc.
MLF and
MicroLeadFrame
are registered trademarks 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 2012
M9999-110812-A
Micrel Inc.
MIC23158/9
Ordering Information
Nominal Output Voltage
Part Number
V
OUT1
MIC23158YML
MIC23159YML
Notes:
1.
2.
Fixed output voltage options available. Contact Micrel Marketing for details.
MLF is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
V
OUT2
ADJ
ADJ
Output
Auto
Discharge
NO
YES
Junction Temperature Range
–40°C to +125°C
–40°C to +125°C
Package
20-Pin 3mm x 4mm MLF
20-Pin 3mm x 4mm MLF
ADJ
ADJ
Pin Configuration
AGND1
AVIN1
SNS1
17
16
15
14
13
20
19
18
VIN1
PGND1
SW1
SW2
PGND2
VIN2
1
1
2
3
4
5
6
7
8
EN1
FB1
PG1
SS1
SS2
PG2
FB2
EP
9
10
12
11
AVIN2
AGND2
3mm x 4mm MLF (ML) Adjustable Output Voltage
(Top View)
Pin Description
Pin Number
(Adjustable)
1
2
3
4
5
6
7
Pin Name
VIN1
PGND1
SW1
SW2
PGND2
VIN2
AVIN2
Pin Function
Power Input Voltage for Regulator 1. Connect a capacitor to ground to decouple noise and switching
transients.
Power Ground for Regulator 1.
Switch (Output): Internal power MOSFET output switches for regulator 1.
Switch (Output): Internal power MOSFET output switches for regulator 2.
Power Ground for Regulator 2.
Power Input Voltage for Regulator 2. Connect a capacitor to ground to decouple noise and switching
transients.
Analog Input Voltage for Regulator 2. Tie to VIN2 and connect a capacitor to ground to decouple
noise.
SNS2
EN2
November 2012
2
M9999-110812-A
Micrel Inc.
MIC23158/9
Pin Description (Continued)
Pin Number
(Adjustable)
8
9
10
11
12
13
14
15
16
17
18
19
20
EP
Pin Name
AGND2
EN2
SNS2
FB2
PG2
SS2
SS1
PG1
FB1
SNS1
EN1
AGND1
AVIN1
ePad
Pin Function
Analog Ground for Regulator 2. Connect to a central ground point where all high current paths meet
(C
IN
, C
OUT
, PGND2) for best operation.
Enable Input for Regulator 2. Logic high enables operation of regulator 2. Logic low will shut down
regulator 2. Do not leave floating.
Sense Input for Regulator 2. Connect to the output of regulator 2 as close to the output capacitor as
possible to accurately sense the output voltage.
Feedback Input for Regulator 2. Connect a resistor divider from the output of regulator 2 to ground to
set the output voltage.
Power Good Output for Regulator 2. Open drain output for the power good indicator for output 2. Use
a pull-up resistor between this pin and V
OUT2
to indicate a power good condition.
Soft-Start for Regulator 2. Connect a minimum of 200pF capacitor to ground to set the turn-on time of
regulator 2. Do not leave floating.
Soft-Start for Regulator 1. Connect a minimum of 200pF capacitor to ground to set the turn-on time of
regulator 1. Do not leave floating.
Power Good Output for Regulator 1. Open drain output for the power good indicator for output 1. Use
a pull-up resistor between this pin and V
OUT1
to indicate a power good condition.
Feedback Input for Regulator 1. Connect a resistor divider from the output of regulator 1 to ground to
set the output voltage.
Sense Input for Regulator 1. Connect to the output of regulator 1 as close to the output capacitor as
possible to accurately sense the output voltage.
Enable Input for Regulator 1. Logic high enables operation of regulator 1. Logic low will shut down
regulator 1. Do not leave floating.
Analog Ground for Regulator 1. Connect to a central ground point where all high current paths meet
(C
IN
, C
OUT
, PGND1) for best operation.
Analog Input Voltage for Regulator 1. Tie to VIN1 and connect a capacitor to ground to decouple
noise.
Exposed Heat Sink Pad. Connect to PGND.
November 2012
3
M9999-110812-A
Micrel Inc.
MIC23158/9
(1)
Absolute Maximum Ratings
Operating Ratings
(2)
Supply Voltage (AVIN1, AVIN2, VIN1, VIN2)....
−0.3V
to 6V
Switch1 (V
SW1
), Sense1 (V
SNS1
)......................
−0.3V
to VIN1
Enable1 (V
EN1
), Power Good1 (V
PG1
) .............
−0.3V
to VIN1
Feedback1 (V
FB1
) .........................................
−-0.3V
to VIN1
Switch2 (V
SW2
), Sense2 (V
SNS2
)...................... -0.3V to VIN2
Enable2 (V
EN2
), Power Good2 (V
PG2
) .............
−0.3V
to VIN2
Feedback2 (V
FB2
) ...........................................
−0.3V
to VIN2
Power Dissipation T
A
= 70°C .................... Internally Limited
Storage Temperature Range ....................
−65°C
to +150°C
Lead Temperature (soldering, 10s) ............................ 260°C
(3)
ESD Rating ..................................................ESD sensitive
Supply Voltage (AVIN1, VIN1) ..................... +2.7V to +5.5V
Supply Voltage (AVIN2, VIN2) ..................... +2.7V to +5.5V
Enable Input Voltage (V
EN1
, V
EN2
) ...................... 0V to V
IN1,2
Output Voltage Range (V
SNS1
, V
SNS2
) .......... +1.0V to +3.3V
Junction Temperature Range (T
J
) ......
−40°C ≤
T
J
≤
+125°C
Thermal Resistance
3mm x 4mm MLF-20 (θ
JA
) ................................. 53°C/W
Electrical Characteristics
(4)
T
A
= 25°C; AV
IN1,2
= V
IN1,2
= V
EN1,2
= 3.6V; L
1,2
= 1.0µH; C
OUT1,2
= 4.7µF unless otherwise specified.
Bold
values indicate –40°C ≤ T
J
≤ +125°C, unless noted.
Parameter
Supply Voltage Range
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Quiescent Current
Shutdown Current
Feedback Regulation Voltage
Feedback Bias Current
Current Limit
Output Voltage Line Regulation
I
OUT
= 0mA , SNS > 1.2 * V
OUTNOM
(both outputs)
V
EN
= 0V; V
IN
= 5.5V (per output)
I
OUT
= 20mA
(per output)
SNS = 0.9*V
OUTNOM
V
IN
= 3.6V to 5.5V if V
OUTNOM
< 2.5V, I
OUT
= 20mA
V
IN
= 4.5V to 5.5V if V
OUTNOM
≥ 2.5V, I
OUT
= 20mA
DCM, V
IN
= 3.6V if V
OUTNOM
< 2.5V
Output Voltage Load Regulation
DCM, V
IN
= 5.0V if V
OUTNOM
≥ 2.5V
CCM, V
IN
= 3.6V if V
OUTNOM
< 2.5V
CCM, V
IN
= 5.0V if V
OUTNOM
≥ 2.5V
I
SW1,2
= 100mA PMOS
I
SW1,2
= -100mA NMOS
I
OUT
= 180mA
V
OUT
= 90%, C
SS
= 470pF
V
SS
= 0V
86
Rising
2.2
0.6045
Rising
Condition
Min.
2.7
2.45
2.55
75
45
0.1
0.62
0.01
4.3
0.45
0.55
1.0
0.8
0.20
0.19
3
300
2.7
92
7
68
95
96
Ω
MHz
µs
µA
%
%
µs
Ω
%
90
5
0.6355
Typ.
Max.
5.5
2.65
Units
V
V
mV
µA
µA
V
µA
A
%/V
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
Notes:
1.
2.
3.
4.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
Specification for packaged product only.
November 2012
4
M9999-110812-A
Micrel Inc.
MIC23158/9
Electrical Characteristics
(4)
(Continued)
T
A
= 25°C; AV
IN1,2
= V
IN1,2
= V
EN1,2
= 3.6V; L
1,2
= 1.0µH; C
OUT1,2
= 4.7µF unless otherwise specified.
Bold
values indicate –40°C ≤ T
J
≤ +125°C, unless noted.
Parameter
Condition
Min.
Enable Input Voltage
Enable Input Current
Output Discharge Resistance
Overtemperature Shutdown
Shutdown Hysteresis
MIC23159 Only; EN = 0V, I
OUT
= 250µA
Logic Low
Logic High
1.2
0.1
225
160
20
2
Typ.
Max.
0.4
Units
V
µA
Ω
°C
°C
November 2012
5
M9999-110812-A
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