MIC33263/4
4MHz, 2A Buck Regulator with Integrated
Inductor and HyperLight Load
®
General Description
The MIC33263/4 is a highly-efficient synchronous buck
regulator with an integrated inductor which provides the
optimal trade-off between footprint and efficiency. The
MIC33263/4 operates at 4MHz switching frequency and
provides up to 2A output current. In addition, the 100%
®
duty cycle and HyperLight Load (HLL) mode-of-operation
delivers very-high efficiency at light loads and ultra-fast
transient response which makes the MIC33263/4 perfectly
suited for any space-constrained application and great
alternative for low dropout regulators. 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 MIC33263/4 provides small compact total solution
size of 4.6mm × 7mm with very few tiny external
components.
At higher loads, the MIC33263/4 provides a constant
switching frequency around 4MHz while achieving peak
efficiencies up to 93%. It also includes under-voltage
lockout to ensure proper operation under power-sag
conditions, internal soft-start to reduce inrush current,
foldback current limit, power good (PG) indicator, and
thermal shutdown. The MIC33263/4 is available in a 20-pin
2.5mm × 3.0mm × 1.9mm QFN package with an operating
junction temperature range from –40°C to +125°C.
Datasheets and support documentation are available on
Micrel’s website at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Integrated MOSFETs, inductor
100% duty cycle
4MHz PWM operation in continuous mode
2A output current
Low output voltage ripple
85% typical efficiency at 1mA and up to 93% peak
efficiency
Ultra-fast transient response
Advanced copper lead frame design provides superior
thermal performance
Thermal-shutdown and current-limit protection
Low-radiated emission (EMI) per EN55022, class B
Adjustable output voltage 0.7V to 5V
Configurable soft-start with pre-bias start-up capability
Auto discharge of 180Ω (MIC33264 only)
Low profile 2.5mm × 3.0mm × 1.9mm QFN packages
0.1µA shutdown current
33µA quiescent current
Applications
•
•
•
•
•
•
5V point-of-load (POL)
Low voltage distributed power systems
Space-constrained applications
Portable devices
SSD storage systems
Digital cameras
Typical Application
Efficiency
vs. Output Current
100
90
80
EFFICENCY (%)
70
60
50
40
30
20
10
0
10
100
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.2V
V
IN
= 3.3V
1000
OUTPUT CURRENT (mA)
HyperLight Load is a registered trademark of Micrel, 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
January 28, 2015
Revision 2.1
Micrel, Inc.
MIC33263/4
Ordering Information
Part Number
MIC33263YGK
MIC33264YGK
Note:
1. QFN is a GREEN, RoHS-compliant package. Mold compound is Halogen Free.
2. Pb-free. Lead finish is matte tin.
Output Voltage
ADJ
ADJ
Auto Discharge
No
Yes
Junction Temperature Range
–40°C to +125°C
–40°C to +125°C
Package
(1,
2)
20-Pin 2.5mm × 3mm QFN
20-Pin 2.5mm × 3mm QFN
Pin Configuration
2.5mm × 3mm QFN (GK)
(Top View)
Pin Description
Pin Number
1, 20
2, 8, 9
3, 4, 5, 6, 7
10, 11, 12, 13
14
15
16
17
18
19
Pin Name
PVIN
PGND
SW
VOUT
AGND
AVIN
SS
PG
FB
EN
Pin Function
Power Input Voltage: Connect a capacitor to PGND to decouple the noise.
Power Ground.
Switch (Output): Internal power MOSFET output switches. Disable pull down 180 Ohms
(MIC33264 only).
Inductor Output. Connect a capacitor to PGND to filter the switcher output voltage.
Analog Ground: Connect to central ground point where all high current paths meet (CIN, COUT,
PGND) for best operation.
Analog Input Voltage: Connect a capacitor to ground to decouple the noise.
Soft-Start: Place a capacitor from SS pin to ground to program the soft-start time
Power Good: Open Drain output for the power good indicator. Place a resistor between this pin
and a voltage source to detect a power good condition.
Feedback: Connect a resistor divider from the output to ground to set the output voltage.
Enable (Input): Logic high enables operation of the regulator. Logic low will shut down the device.
Do not leave floating.
January 28, 2015
2
Revision 2.1
Micrel, Inc.
MIC33263/4
Absolute Maximum Ratings
(3)
Supply Voltage (V
IN
= V
AVIN
= V
PVIN
) ..................
−0.3V
to 6V
Power Good Voltage (V
PG
) ................................
−0.3V
to 6V
Output Switch Voltage (V
SW
) .............................
−0.3V
to 6V
Enable Input Voltage (V
EN
) .. ..............................−0.3V to V
IN
Junction Temperature (T
J
) ....................................... +150°C
Storage Temperature Range (T
S
) .............
−65°C
to +150°C
Lead Temperature (soldering, 10s) ............................ 260°C
(5)
ESD Rating ................................................. ESD Sensitive
Operating Ratings
(4)
Supply Voltage (V
IN
= V
AVIN
= V
PVIN
) ................. 2.7V to 5.5V
Enable Input Voltage (V
EN
) .. ……………………….0V to V
IN
Feedback Voltage (V
FB
) ...................................... 0.7V to V
IN
Junction Temperature Range (T
J
).. ….−40°C
≤
T
J
≤
+125°C
Thermal Resistance
20-Pin 2.5mm × 3mm
QFN
(θ
JA
) ........................ 50°C/W
Electrical Characteristics
(6)
T
A
= 25°C; V
IN
= V
EN
= 3.6V; C
OUT
= 22µF unless otherwise specified.
Bold
values indicate
−40°C
≤ T
J
≤ +125°C, unless otherwise
specified.
Parameter
Supply Voltage Range
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Quiescent Current
Shutdown Current
Output Voltage Accuracy
Feedback Regulation Voltage
Current Limit
Output Voltage Line Regulation
Output Voltage Load Regulation
V
SNS
= 0.9 × V
OUTNOM
V
IN
= 3.6V to 5.5V, I
LOAD
= 20mA
20mA ≤ I
LOAD
≤ 1A, V
IN
= 3.6V
20mA ≤ I
LOAD
≤ 1A, V
IN
= 5.5V
I
SW
= 100mA PMOS
I
SW
=
−100mA
NMOS
I
OUT
= 120mA
V
OUT
= 90%, C
SS
= 1nF
V
SS
= 0V
% of V
NOM
85
I
OUT
= 0mA , V
SNS
>
1.2 × V
OUT
Nominal
V
EN
= 0V; V
IN
= 5.5V
V
IN
= 3.6V if V
OUTNOM
<
2.5V, I
LOAD
= 20mA
V
IN
= 5.5V if V
OUTNOM
≥
2.5V, I
LOAD
= 20mA
−2.5
0.682
2.5
0.7
3.3
0.3
0.3
Turn-On
Condition
Min.
2.7
2.40
2.53
75
33
0.1
85
2
+2.5
0.717
Typ.
Max.
5.5
2.65
Units
V
V
mV
µA
µA
%
V
A
%/V
%
Ω
MHz
µs
µA
95
%
PWM Switch On-Resistance
Switching Frequency
Soft-Start (SS) Time
Soft-Start (SS) Current
Power Good (PG) Threshold (Rising)
Notes:
0.13
4
1000
2.2
90
3. Exceeding the absolute maximum ratings may damage the device.
4. The device is not guaranteed to function outside its operating ratings.
5. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
6. Specification for packaged product only
January 28, 2015
3
Revision 2.1
Micrel, Inc.
MIC33263/4
Electrical Characteristics
(6)
(Continued)
T
A
= 25°C; V
IN
= V
EN
= 3.6V; C
OUT
= 22µF unless otherwise specified.
Bold
values indicate
−40°C
≤ T
J
≤ +125°C, unless otherwise
specified.
Parameter
Power Good Threshold Hysteresis
Power Good Pull-Down
Enable Threshold
Enable Hysteresis
Enable Input Current
Overtemperature Shutdown
Overtemperature Shutdown Hysteresis
SW Pull-Down Resistance
(MIC33264 only)
V
EN
= 0V
V
SNS
= 90% V
NOMINAL
, I
PG
= 1mA
Turn-On
0.5
Condition
Min.
Typ.
7
60
0.8
70
0.1
160
20
180
2
200
1.2
Max.
Units
%
mV
V
mV
µA
°C
°C
Ω
January 28, 2015
4
Revision 2.1
Micrel, Inc.
MIC33263/4
Typical Characteristics
Efficiency
vs. Output Current
100
90
80
100
90
100000
80
Efficiency
vs. Output Current
1000000
VOUT Rise Time
vs. CSS
EFFICIENCY (%)
EFFICENCY (%)
RISE TIME (µs)
70
60
50
40
30
20
10
0
10
100
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.2V
70
60
50
40
30
V
OUT
= 1.8V
V
OUT
= 2.5V
V
OUT
= 3.3V
V
OUT
= 1.2V
10000
1000
100
V
IN
= 3.3V
20
10
10
100
V
IN
= 5V
10
V
IN
= 3.6V
1
1000
100
1000
10000
100000
1000000
1000
OUTPUT CURRENT (mA)
OUTPUT CURRENT(mA)
CSS (pF)
Current Limit
vs. Input Voltage
4
3.8
Quiscent Current
vs. Input Voltage
45
40
30
35
Quiscent Current
vs. Temperature
CURRENT LIMIT (A)
35
3.6
30
25
20
15
3
25
IQ (µA)
3.4
3.2
IQ (µA)
20
15
10
10
2.8
2.6
2.5
3
3.5
4
4.5
5
5.5
V
OUT
= 2.4V
V
OUT
= 2V
NO LOAD
5
0
V
IN
= 3.6V
V
OUT
=1.75V
5
0
2.5
3
3.5
4
4.5
5
5.5
-40
-20
0
20
40
60
80
100
120
INPUT VOLTAGE (V)
VIN (V)
TEMPERATURE (°C)
Line Regulation
(Light Loads)
2.006
2.005
Line Regulation
(High Loads)
2.018
2.016
2.08
2.07
2.06
Output Voltage
vs. Output Current (DCM)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
2.014
2.012
2.01
2.008
2.006
2.004
2.002
2
1.998
2.5
3
3.5
4
4.5
300mA
500mA
2A
2.004
2.003
2.002
2.001
2
150mA
1.999
2.5
3
3.5
4
4.5
5
5.5
50mA
2.05
2.04
2.03
2.02
2.01
2
1.99
1.98
1.97
1.96
V
IN
= 3.6V
0
20
40
60
80 100 120 140 160 180 200
5
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
January 28, 2015
5
Revision 2.1
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