MIC2101/02
38V, Synchronous Buck Controllers
Featuring Adaptive On-Time Control
Hyper Speed Control
Family
General Description
The
Micrel
MIC2101/02
are
constant-frequency,
synchronous buck controllers featuring a unique adaptive
ON-time control architecture. The MIC2101/02 operates
over an input supply range from 4.5V to 38V and can be
used to supply up to 15A of output current. The output
voltage is adjustable down to 0.8V with a guaranteed
accuracy of ±1%. The device operates with programmable
switching frequency from 200kHz to 600kHz.
Micrel’s Hyper Light Load™ architecture provides the same
high-efficiency and ultra-fast transient response as the Hyper
Speed Control architecture under the medium to heavy loads,
but also maintains high efficiency under light load conditions
by transitioning to variable frequency, discontinuous-mode
operation.
The MIC2101/02 offers a full suite of protection features to
ensure protection of the IC during fault conditions. These
include under-voltage lockout to ensure proper operation
under power-sag conditions, internal soft-start to reduce
inrush current, fold-back current limit, “hiccup” mode short-
circuit protection and thermal shutdown.
All support documentation can be found on Micrel’s web
site at:
www.micrel.com.
Features
Hyper Speed Control architecture enables:
High Delta V operation (V
IN
= 38V and V
OUT
= 1.2V)
Any Capacitor stable
4.5V to 38V input voltage
Adjustable output voltage from 0.8 V to 24V (also limited
by duty cycle)
200kHz to 600kHz, programmable switching frequency
Hyper Light Load Control (MIC2101)
Hyper Speed Control (MIC2102)
Enable input and Power Good output
Built-in 5V regulator for single-supply operation
Programmable current limit and fold-back “hiccup” mode
short-circuit protection
5ms internal soft-start, internal compensation, and
thermal shutdown
Supports safe start-up into a pre-biased output
–40 C to +125 C junction temperature range
Available in 16-pin 3mm x 3mm QFN package
Applications
Distributed power systems
Networking/telecom Infrastructure
Printers, scanners, graphic cards, and video cards
Typical Application
MIC2101 Efficiency (V
IN
= 12V)
vs. Output Current (MIC2101)
100
90
80
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
f
SW
= 600kHz (CCM)
EFFICIENCY (%)
70
60
50
40
30
20
10
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
MIC2101/02 Wide Input, Hyper Light Load Buck Converter
OUTPUT CURRENT (A)
Hyper Speed Control, Hyper Light Load, and Any Capacitor are trademarks 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
November 13, 2013
Revision 2.0
Micrel, Inc.
MIC2101/02
Ordering Information
Part Number
MIC2101YML
MIC2102YML
Switching
Frequency
200kHz to 600kHz
200kHz to 600kHz
Features
Hyper Light Load
Hyper Speed Control
Package
16-Pin 3mm x 3mm QFN
16-Pin 3mm x 3mm QFN
Junction
Temperature
Range
–40°C to +125°C
–40°C to +125°C
Lead Finish
Pb-Free
Pb-Free
Pin Configuration
16-Pin 3mm x 3mm QFN (ML)
(Top View)
Pin Description
Pin Number
1
2
3
Pin Name
VDD
PVDD
ILIM
Pin Function
Internal +5V Linear Regulator
ceramic capacitor from VDD to AGND is required for decoupling. In the applications with VIN <
+5.5V, VDD should be tied to VIN to by-pass the linear regulator.
5V supply input for the low-side N-channel MOSFET driver, which can be tied to VDD externally.
Current Limit Setting. Connect a resistor from SW to ILIM to set the over-current threshold for the
converter.
Low-Side Drive output. High-current driver output for external low-side MOSFET of a buck
converter. The DL driving voltage swings from ground to VDD. Adding a small resistor between
DL pin and the gate of the low-side N-channel MOSFET can slow down the turn-on and turn-off
speed of the MOSFET.
Power Ground. PGND is the return path for the buck converter power stage. The PGND pin
connects to the sources of low-side N-Channel external MOSFET, the negative terminals of input
capacitors, and the negative terminals of output capacitors. The return path for the power ground
should be as small as possible and separate from the signal ground (AGND) return path.
Switching Frequency Adjust input. Tie this pin to VIN to operate at 600kHz and place a resistor
divider to reduce the frequency.
4
DL
5
PGND
6
FREQ
November 13, 2013
2
Revision 2.0
Micrel, Inc.
MIC2101/02
Pin Configuration (Continued)
Pin Number
7
Pin Name
DH
Pin Function
High-Side Drive Output. High-current driver output for external high-side MOSFET of a buck
converter. The DH driving voltage is floating on the switch node voltage (V
SW
). Adding a small
resistor between DH pin and the gate of the high-side N-channel MOSFET can slow down the
turn-on and turn-off speed of the MOSFET.
Switch Node and Current-Sense input. High current output driver return. The SW pin connects
directly to the switch node. Due to the high-speed switching on this pin, the SW pin should be
routed away from sensitive nodes. The SW pin also senses the current by monitoring the voltage
across the low-side MOSFET during OFF time. In order to sense the current accurately, connect
the low-side MOSFET drain to the SW pin using a Kelvin connection.
No Connection.
Voltage supply input for the high-side N-channel MOSFET driver, which can be powered by a
10
BST
ceramic capacitor. Adding a small resistor at BST pin can slow down the turn-on speed of the
high-side MOSFET.
Signal ground for VDD and the control circuitry, which is connected to thermal pad electronically.
The signal ground return path should be separate from the power ground (PGND) return path.
Feedback Input. Input to the transconductance amplifier of the control loop. The FB pin is
regulated to 0.8V. A resistor divider connecting the feedback to the output is used to set the
desired output voltage.
Power Good Output. Open drain output, an external pull-up resistor to VDD or external power
rails is required.
Enable Input. A logic signal to enable or disable the buck converter operation. The EN pin is
CMOS compatible. Logic high enables the device, logic low shutdowns the regulator. In the
disable mode, the VDD supply current for the device is minimized to 0.7mA typically. Don not pull
EN pin to VDD/PVDD.
from VIN to AGND is required for decoupling.
Exposed Pad. Connect the EPAD to PGND plain on the PCB to improve the thermal
performance.
8
SW
9, 11
NC
12
13
14
AGND
FB
PG
15
EN
16
EP
VIN
ePad
November 13, 2013
3
Revision 2.0
Micrel, Inc.
MIC2101/02
Absolute Maximum Ratings
(1)
V
IN
................................................................ 0.3V to +40V
V
DD
, V
PVDD
........................................................ 0.3V to +6V
V
SW
, V
FREQ
, V
ILIM
, V
EN
............................ 0.3V to (V
IN
+0.3V)
V
BST
to V
SW
........................................................ 0.3V to 6V
V
BST
................................................................ 0.3V to 46V
V
PG
..................................................... 0.3V to (V
DD
+ 0.3V)
V
FB
..................................................... 0.3V to (V
DD
+ 0.3V)
PGND to AGND............................................ 0.3V to +0.3V
Junction Temperature .............................................. +150°C
Storage Temperature (T
S
)......................... 65 C to +150 C
Lead Temperature (soldering, 10s)............................ 260°C
(
)
ESD Rating
2
................................................ ESD Sensitive
Operating Ratings
(3)
Supply Voltage (V
IN
).......................................... 4.5V to 38V
Enable Input (V
EN
) .................................................. 0V to V
IN
V
SW
, V
FREQ
, V
ILIM
, V
EN
............................................. 0V to V
IN
Junction Temperature (T
J
) ........................ 40 C to +125 C
Junction Thermal Resistance
3mm x 3mm QFN-16 (
JA
) ....................................50.8°C/W
3mm x 3mm QFN-16 (
JC
) ......................25.3°C/W
Electrical Characteristics
(
4
)
V
IN
= 12V, V
OUT
=1.2V; V
BST
– V
SW
= 5V; T
A
= 25°C, unless noted.
Bold
values indicate
Parameter
Power Supply Input
Input Voltage Range (V
IN
)
(5)
J
Condition
Min.
4.5
Typ.
Max.
38
Units
V
μA
mA
μA
V
V
mV
%
Quiescent Supply Current (MIC2101)
Quiescent Supply Current (MIC2102)
Shutdown Supply Current
VDD Supply
VDD Output Voltage
VDD UVLO Threshold
VDD UVLO Hysteresis
Load Regulation
Reference
Feedback Reference Voltage
FB Bias Current
Enable Control
EN Logic Level High
EN Logic Level Low
EN Hysteresis
EN Bias Current
Notes:
V
FB
= 1.5V
V
FB
= 1.5V
SW unconnected, V
EN
= 0V
V
IN
= 7V to 38V, I
DD
= 10mA
V
DD
rising
I
DD
= 0 to 40mA
T
J
= 25°C (±1.0%)
40°C
T
J
C (±2%)
V
FB
= 0.8V
1.8
4.8
3.8
0.6
0.792
0.784
400
2.1
0.1
5.2
4.2
400
2
0.8
0.8
5
750
3
10
5.4
4.6
3.6
0.808
0.816
500
V
nA
V
0.6
200
V
EN
= 12V
6
30
V
mV
μA
1. Exceeding the absolute maximum rating may damage the device.
2. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k
3. The device is not guaranteed to function outside operating range.
4. Specification for packaged product only.
5. The application is fully functional at low V
DD
(supply of the control section) if the external MOSFETs have low voltage V
TH
.
in series with 100pF.
November 13, 2013
4
Revision 2.0
Micrel, Inc.
MIC2101/02
Electrical Characteristics
(
4
)
(Continued)
V
IN
= 12V, V
OUT
= 1.2V; V
BST
– V
SW
= 5V; T
A
= 25°C, unless noted.
Bold
values indicate
Parameter
Oscillator
Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Minimum Off-Time
Soft-Start
Soft-Start time
Short-Circuit Protection
Current-Limit Threshold
Short-Circuit Threshold
Current-Limit Source Current
Short-Circuit Source Current
FET Drivers
DH, DL Output Low Voltage
DH, DL Output High Voltage
DH On-Resistance, High State
DH On-Resistance, Low State
DL On-Resistance, High State
DL On-Resistance, Low State
SW, BST Leakage Current
Power Good (PG)
PG Threshold Voltage
PG Hysteresis
PG Delay Time
PG Low Voltage
Thermal Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Hysteresis
T
J
Rising
160
7
°C
°C
Sweep V
FB
from Low to High
Sweep V
FB
from High to Low
Sweep V
FB
from Low to High
V
FB
< 90% x V
NOM
, I
PG
= 1mA
85
90
6
100
70
200
95
%V
OUT
%V
OUT
μs
mV
I
SINK
= 10mA
I
SOURCE
= 10mA
V
PVDD
0.1V
or
V
BST
0.1V
2.1
1.8
1.8
1.2
3.3
3.3
3.3
2.3
50
μA
0.1
V
V
V
FB
= 0.79V
V
FB
= 0V
V
FB
= 0.79V
V
FB
= 0V
30
23
60
27
14
7
80
37
0
9
100
47
mV
mV
μA
μA
5
ms
V
FB
> 0.8V
140
V
FREQ
= V
IN
V
FREQ
= 50%V
IN
400
600
300
85
0
200
260
750
kHz
%
%
ns
Condition
Min.
J
Typ.
Max.
Units
November 13, 2013
5
Revision 2.0
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