MIC33050
4MHz Internal Inductor PWM Buck
Regulator with HyperLight Load™
General Description
Features
The Micrel MIC33050 is a high efficiency 600mA PWM
HyperLight Load™
•
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 output voltage options from 0.72V to 3.3V
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 typical quiescent current
loads.
•
4MHz in PWM in constant current mode
The MIC33050 also has a very low typical quiescent
•
Low voltage output ripple
current draw of 20µA and can achieve over 83% efficiency
– 25mVpp in HyperLight Load™ mode
even at 1mA.
– 3mV output voltage ripple in full PWM mode
In contrast to traditional light load schemes, the HyperLight
•
>93% efficiency
Load™ architecture does need not trade off control speed
to obtain low standby currents and in doing so, the device
•
>83% at 1mA
only needs a small output capacitor to absorb the load
•
Micropower shutdown
transient as the powered device goes from light load to full
•
3mm x 3mm MLF
®
-12L
load.
•
–40°C to +125°C junction temperature range
At higher loads, the MIC33050 provides a constant
switching frequency of greater than 4MHz while providing
Applications
peak efficiencies greater than 93%.
The MIC33050
comes in fixed output voltage options from
•
Cellular phones
0.72V to 3.3V thereby eliminating external feedback
•
Digital cameras
components.
•
Portable media players
The MIC33050 is available in an 12-pin 3mm x 3mm MLF
®
•
Wireless LAN cards
with a junction operating range of –40°C to +125°C.
•
WiFi/WiMax/WiBro modules
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
90
EFFICIENCY (%)
80
70 V = 3.6V
IN
60
50
1
V
IN
= 4.2V
V
IN
= 3.0V
10
100
1000
OUTPUT CURRENT (mA)
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
December 2008
1
M9999-121008-B
Micrel, Inc.
MIC33050
Ordering Information
Part Number
MIC33050-4YHL
MIC33050-GYHL
MIC33050-SYHL
Note:
1.
2.
Other output voltage options available. Contact Micrel for details.
MLF is a green RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
®
Voltage
1.2V
1.8V
3.3V
Temperature Range
–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
®
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pin Configuration
12-Pin 3mm x 3mm MLF
®
(HL)
(Top View)
Pin Description
Pin Number
1
9
10
Pin Name
VIN
EN
SNS
Pin Function
Supply Voltage (Input): Requires bypass capacitor-to-GND.
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
set the output voltage. For fixed output voltages connect to V
OUT
(internal
resistor network sets the output voltage).
Feed forward capacitor connected to out sense pin
Power Ground
Analog ground
Switch (Output): Internal power MOSFET output switches.
Output after the internal inductor
Connect to power ground.
11
2
12
3,4,5,6
7,8
E-PAD
CFF
PGND
AGND
SW
OUT
HS PAD
December 2008
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M9999-121008-B
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)
.................................................................. 3kV
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 (θ
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
Under-Voltage 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
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,
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
89
0.45
0.5
4
650
0.8
35
0.1
165
20
32
4
+2.5
1.7
Max
5.5
2.65
Units
V
V
mV
µA
µA
%
A
%/V
%
%
Ω
Ω
MHz
µs
V
mV
µA
°C
°C
80
3.4
0.5
4.6
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.
December 2008
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M9999-121008-B
Embedded System
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