MIC33163/4
4MHz, 1A, Buck Regulator with Integrated
Inductor and HyperLight Load
®
General Description
The MIC33163/4 is a highly-efficient synchronous buck
regulator with integrated inductor which provides the
optimal trade-off between footprint and efficiency. The
MIC33163/4 operates at 4MHz switching frequency and
provides up to 1A 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 MIC33163/4 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 MIC33163/4 provides a small compact total solution
size of 4.6mm × 7mm with very few tiny external
components.
At higher loads, the MIC33163/4 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, fold-
back current limit, power good (PG) indicator and thermal
shutdown. The MIC33163/4 is available in 20-pin 2.5mm ×
3.0mm × 1.1mm 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 and inductor
100% duty cycle
4MHz PWM operation in continuous mode
1A output current
Low output voltage ripple
85% typical efficiency at 1mA, up to 93% peak efficiency
Ultra-fast transient response
Advanced copper lead frame design provides superior
thermal performance
Low-radiated emission (EMI) per EN55022, class B
Adjustable output voltage 0.7V to 5V
Thermal-shutdown and current-limit protection
Configurable soft-start with pre-bias start-up capability
Auto discharge of 180Ω (MIC33164 only)
Low profile 2.5mm × 3.0mm ×1.1mm 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
EFFICIENCY (%)
70
60
50
40
30
20
10
10
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
=3.3V
V
IN
= 5V
100
OUTPUT CURRENT(mA)
1000
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
May 22, 2014
Revision 1.1
Micrel, Inc.
MIC33163/4
Ordering Information
Part Number
MIC33163YGJ
MIC33164YGJ
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 (GJ)
Adjustable Output Voltage
(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 180Ω (MIC33164 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 VOUT to AGND 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.
May 22, 2014
2
Revision 1.1
Micrel, Inc.
MIC33163/4
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
noted.
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
V
SNS
= 0.9 × V
OUTNOM
V
IN
= 3.6V to 5.5V, I
LOAD
= 20mA
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
(Turn-On)
Condition
Min.
2.7
2.40
2.53
75
33
0.1
55
2
+2.5
0.717
Typ.
Max.
5.5
2.65
Units
V
V
mV
µA
µA
%
V
A
%/V
20mA ≤ I
LOAD
≤ 1A, V
IN
= 3.6V
Output Voltage Load Regulation
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
0.3
%
0.3
0.13
0.13
4
1000
2.2
90
95
Ω
Ω
MHz
µs
µA
%
PWM Switch ON-Resistance
Switching Frequency
Soft-Start Time
Soft-Start Current
Power Good Threshold (Rising)
Notes:
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.
May 22, 2014
3
Revision 1.1
Micrel, Inc.
MIC33163/4
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
noted.
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
(MIC33164 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
May 22, 2014
4
Revision 1.1
Micrel, Inc.
MIC33163/4
Typical Characteristics
Efficiency vs.
Output Current
100
90
80
V
OUT
= 2.5V
Efficiency vs.
Output Current
100
90
100000
80
V
OUT
= 1.2V
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 3.3V
VOUT Rise Time
vs. CSS
1000000
EFFICENCY (%)
60
50
40
30
20
10
0
10
100
OUTPUT CURRENT(mA)
1000
V
IN
= 3.3V
60
50
40
30
20
10
10
100
V
OUT
= 1.2V
RISE TIME (µs)
V
OUT
= 1.8V
EFFICIENCY (%)
70
70
10000
1000
100
V
IN
= 5V
10
V
IN
= 3.6V
1
1000
100
1000
10000
CSS (pF)
100000
1000000
OUTPUT CURRENT(mA)
Current Limit vs.
Input Voltage
4
3.8
CURRENT LIMIT (A)
3.6
3.4
3.2
3
2.8
2.6
2.5
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
Line Regulation
(High Loads)
1.77
1.768
1100
1000
Max. Output Current vs.
Temperature
MAX OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
1.766
1.764
1.762
1.76
1.758
1.756
1.754
1.752
1.75
2.5
3
3.5
4
4.5
5
5.5
900
800
700
600
500
400
300
200
100
0
20
40
60
80
100
120
V
OUT
= 1.8V
V
IN
= 5V
V
IN
=3.3V
1A
500mA
200mA
INPUT VOLATGE (V)
AMBIENT TEMPERATURE(°C)
May 22, 2014
5
Revision 1.1
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