MIC33050
4MHz Internal Inductor PWM Buck
Regulator with HyperLight Load
®
General Description
Features
The Micrel MIC33050 is a high-efficiency 600mA PWM
Input voltage: 2.7V to 5.5V
synchronous buck (step-down) regulator with internal
600mA output current
inductor featuring HyperLight Load, a patent-pending
Fixed and adjustable output voltage options
switching scheme that offers best-in-class light load
No external inductor required
efficiency and transient performance while providing very
Ultra-fast transient response
small external components and low output ripple at all
20µA quiescent current
loads.
4MHz switching in PWM mode
The MIC33050 also has a very-low typical quiescent
Low output voltage ripple
current of 20µA and can achieve over 85% efficiency even
>93% peak efficiency
at 1mA.
>85% efficiency at 1mA
In contrast to traditional light load schemes, the HyperLight
Micropower shutdown
Load architecture does not trade off control speed to
obtain low standby currents and in doing so, the device
12-pin 3mm x 3mm MLF
®
only needs a small output capacitor to absorb the load
–40C to +125C junction temperature range
transient as the powered device goes from light load to full
load.
Applications
At higher loads, the MIC33050 provides a constant
switching frequency of greater than 4MHz while providing
Cellular phones
peak efficiencies greater than 93%.
Digital cameras
The MIC33050
is available in fixed and adjustable output
Portable media players
voltages and
comes in a 12-pin 3mm x 3mm MLF
®
with a
Wireless LAN cards
junction operating range of –40C to +125C.
WiFi, WiMax, and WiBro modules
Data sheets and support documentation can be found on
USB-powered devices
Micrel’s web site at:
www.micrel.com.
____________________________________________________________________________________________________________
Typical Application
HyperLight Load is a registered 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
May 2012
M9999-050312-C
Micrel, Inc.
MIC33050
Ordering Information
Part Number
MIC33050-CYHL
MIC33050-4YHL
MIC33050-GYHL
MIC33050-SYHL
MIC33050-AYHL
Notes:
1.
2.
Other output voltage options available. Please contact Micrel for details.
MLF is a green RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
®
Voltage
1.0V
1.2V
1.8V
3.3V
ADJ
Temperature Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° 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
®
®
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pin Configuration
12-Pin 3mm x 3mm MLF
®
(HL) Fixed Output
Top View
12-Pin 3mm x 3mm MLF
®
(HL) Adjustable Output
Top View
Pin Description
Pin Number
(Fixed)
1
2
3, 4, 5, 6
7, 8
9
10
Pin Number
(Adj)
1
2
3, 4, 5, 6
7, 8
9
10
Pin Name
VIN
PGND
SW
OUT
EN
SNS
Pin Function
Supply Voltage (Input): Requires bypass capacitor-to-GND.
Power Ground.
Switch (Output): Internal power MOSFET output switches.
Output after the internal inductor.
Enable (Input): Logic low will shut down the device, reducing the quiescent
current to less than 4µA. Do not leave floating.
Input to the error amplifier. Connect to the external resistor divider network to
see the output voltage. For fixed output voltages connect V
OUT
(internal resistor
network sets the output voltage).
Feed forward capacitor connected to out sense pin.
Feedback voltage. Connect a resistor divider from output to ground to set the
output voltage.
Analog ground.
Exposed Heatsink Pad. Connect to power ground for best thermal performance.
11
–
12
EP
–
11
12
EP
CFF
FB
AGND
ePad
May 2012
2
M9999-050312-C
Micrel, Inc.
MIC33050
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .........................................................6V
Output Switch Voltage (V
SW
) ............................................6V
Output Switch Current (I
SW
)..............................................2A
Logic Input Voltage (V
EN
) .................................. –0.3V to V
IN
Storage Temperature Range (T
s
)..............–65°C to +150°C
ESD Rating
(3)
................................................. ESD Sensitive
Operating Ratings
(2)
Supply Voltage (V
IN
)......................................... 2.7V to 5.5V
Logic Input Voltage (V
EN
)…………………………-0.3V to V
IN
Junction Temperature (T
J
) ..................–40°C
≤
T
J
≤
+125°C
Thermal Resistance
3mm x 3mm MLF
®
-12 (
JA
)................................60°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
IN
= V
EN
= 3.6V; C
FF
= 560pF; C
OUT
= 4.7µF; I
OUT
= 20mA unless otherwise specified.
Bold
values indicate –40°C< T
J
< +125°C.
Parameter
Supply Voltage Range
Undervoltage Lockout Threshold
UVLO Hysteresis
Quiescent Current, Hyper LL mode
Shutdown Current
Output Voltage Accuracy
Current Limit in PWM Mode
Output Voltage Line Regulation
Output Voltage Load Regulation
Feedback Voltage
Maximum Duty Cycle
PWM Switch ON-Resistance
Frequency
Soft-Start Time
Enable Threshold
Enable Hysteresis
Enable Input Current
Over-temperature Shutdown
Over-temperature Shutdown
Hysteresis
Condition
(turn-on)
I
OUT
= 0mA ; V
SNS
> 1.2*V
OUT
nominal
V
IN
= 5.5V; V
EN
= 0V
V
IN
= 3.0V; I
LOAD
= 20mA
SNS = 0.9*V
NOM
V
IN
= 3.0V to 5.5V; I
LOAD
= 20mA
20mA < I
LOAD
< 500mA,
V
IN
= 3.0V; I
OUT
= 20mA
SNS
V
NOM
I
SW
= 100mA PMOS
I
SW
= -100mA NMOS
I
LOAD
= 120mA
V
OUT
= 90%
(turn-on)
Min.
2.7
2.45
Typ.
2.55
100
20
0.01
–2.5
0.65
1
0.5
0.3
400
89
0.45
0.5
4
650
0.8
35
0.1
165
20
Max.
5.5
2.65
32
4
+2.5
1.7
Units
V
V
mV
µA
µA
%
A
%/V
%
mV
%
Ω
MHz
µs
V
mV
µA
C
C
390
80
410
0.5
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.
May 2012
3
M9999-050312-C
Micrel, Inc.
MIC33050
Typical Characteristics
Efficiency V
OUT
= 3.3V
100
V
90
EFFICIENCY (%)
80
V
70
60
50
1
IN
IN
Efficiency V
OUT
= 1.8V
100
Efficiency V
OUT
= 1.2V
100
= 4.2V
90
EFFICIENCY (%)
80
70 V
60
50
1
= 3.6V
V
IN
V
EFFICIENCY (%)
IN
= 3.0V
90
80
70
60
50
1
V
IN
= 2.7V
= 5.0V
V
IN
= 5.5V
= 4.2V
IN
V
IN
= 3.6V
V
IN
= 4.2V
10
100
1000
OUTPUT CURRENT (mA)
10
100
1000
OUTPUT CURRENT (mA)
10
100
1000
OUTPUT CURRENT (mA)
Efficiency V
OUT
= 1.0V
100
QUIESCENT CURRENT (uA)
40
Quiescent Current vs.
Temperature
50
Quiescent Current vs. Input
Voltage
QUIESCENT CURRENT (µA)
45
40
35
30
25
20
15
10
5
0
2.7
3.2
3.7
4.2
V
IN
= 3.6V
V
OUT
= 1.8V
No Load
90
EFFICIENCY (%)
80
70
V
IN
= 2.7V
30
20
V
IN
= 4.2V
60 V
IN
= 3.6V
L = 1uH
50
1
10
100
1000
OUTPUT CURRENT (mA)
10
V
IN
= 3.6V
V
OUT
= 1.8V
0
-40
-20
0
20
40
60
80
100
120
4.7
5.2
TEMPERATURE (°C)
INPUT VOLTAGE (V)
Switching Frequency vs.
Temperature
SWITCHING FREQUENCY (MHz)
5.5
SWITCHING FREQUENCY (MHz)
Switching Frequency vs. Input
Voltage
5.50
5.00
4.50
4.00
3.50
3.00
2.50
2.70
V
IN
= 3.6V
V
OUT
= 1.8V
Load = 150mA
3.20
3.70
4.20
4.70
5.20
0.5
Feedback Voltage vs.
Temperature
FEEDBACK VOLTAGE (V)
0.48
0.46
0.44
0.42
0.4
0.38
0.36
0.34
0.32
0.3
-40
-20
0
20
40
60
80
100
120
V
IN
= 3.6V
V
OUT
= 1.8V
No Load
5
4.5
4
3.5
3
2.5
-40
-20
0
20
40
60
80
100
120
V
IN
= 3.6V
V
OUT
= 1.8V
Load = 150mA
TEMPERATURE (°C)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
May 2012
4
M9999-050312-C
Micrel, Inc.
MIC33050
Typical Characteristics (Continued)
Output Voltage vs. Temperature
1.9
1.9
Output Voltage vs. Input
Voltage (V)
1.90
Output Voltage
vs. Output Current
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1.85
1.85
1.85
1.8
1.8
1.80
1.75
V
IN
= 3.6V
V
OUT
= 1.8V
No Load
1.75
Load = 20mA
1.7
1.75
V
IN
= 3.6V
100 200 300 400 500 600
OUTPUT CURRENT (mA)
1.7
-40
-20
0
20
40
60
80
100
120
1.70
0
2.7
3.2
3.7
4.2
4.7
5.2
TEMPERATURE (°C)
INPUT VOLTAGE (V)
May 2012
5
M9999-050312-C
嵌入式系统
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