MIC2164/-2/-3/C
Synchronous Buck Controllers
Featuring Adaptive On-Time Control
28V Input, Constant Frequency
Hyper Speed Control™ Family
General Description
The Micrel MIC2164/-2/-3/C are constant-frequency,
synchronous buck controllers featuring adaptive on-time
control. The MIC2164/-2/-3/C are the first products in the new
Hyper Speed Control™ family of buck controllers introduced
by Micrel.
The MIC2164/-2/-3/C controllers operate over an input supply
range of 3V to 28V, and are independent of the IC supply
voltage. The devices are capable of supplying 25A output
current. While the MIC2164 operates at 300kHz, the
MIC2164-2 operates at 600kHz, and the MIC2164-3 operates
at 1MHz.
A unique Hyper Speed Control™ architecture allows for ultra-
fast transient response while reducing the output capacitance
and also makes High V
IN
/Low V
OUT
operation possible. The
MIC2164/-2/-3/C controllers utilizes an architecture which is
adaptive T
ON
ripple controlled. A UVLO feature is provided to
ensure proper operation under power-sag conditions to
prevent the external power MOSFET from overheating. A soft
start feature is provided to reduce the inrush current.
Foldback current limit and “hiccup” mode short-circuit
protection ensure FET and load protection.
The MIC2164/-2/-3/C controllers are available in a 10-pin
MSOP (MAX1954A-compatible) package with a junction
operating range from –40°C to +125°C.
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
HSD
= 28V and V
OUT
= 0.8V)
-
Smaller output capacitors than competitors
3V to 28V input voltage
Any Capacitor
TM
stable
-
Zero ESR to high ESR
25A output current capability
300kHz/600kHz/1MHz switching frequency
Adaptive on-time mode control
Adjustable output from 0.8V to 5.5V with ±1%
(MIC2164/-2/-3) or ±3% (MIC2164C) FB accuracy
Up to 95% efficiency
Foldback current-limit and “hiccup” mode short-circuit
protection
6ms Internal soft start
Thermal shutdown
Safe start-up into pre-biased loads
–40°C to +125°C junction temperature range
Available in 10-pin MSOP package
•
•
•
•
•
•
•
•
•
•
•
•
•
Applications
•
•
•
Set-top box, gateways and routers
Printers, scanners, graphic cards and video cards
Telecommunication, PCs and servers
________________________________________________________________________________________________________________________
Typical Application
MIC2164
12V to 3.3V Efficiency
100
95
90
EFFICIENCY (%)
85
80
75
70
65
60
55
50
0
4
8
12
16
20
VIN=5V
MIC2164/-2/-3/C Synchronous Controllers Featuring Adaptive On-Time Control
OUTPUT CURRENT (A)
Hyper Speed Control and Any Capacitor is a 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
September 2010
M9999-091310-D
Micrel, Inc.
MIC2164/-2/-3/C
Ordering Information
Part Number
MIC2164YMM
MIC2164-2YMM
MIC2164-3YMM
MIC2164CYMM
Voltage
Adjustable
Adjustable
Adjustable
Adjustable
Switching
Frequency
300kHz
600kHz
1MHz
270kHz
Accuracy
±1%
±1%
±1%
±3%
Junction Temperature Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
10-pin MSOP
10-pin MSOP
10-pin MSOP
10-pin MSOP
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pin Configuration
10-Pin MSOP (MM)
Pin Description
Pin Number
1
Pin Name
HSD
Pin Function
High-Side N-MOSFET Drain Connection (input): Power to the drain of the external high-side N-channel
MOSFET. The HSD operating voltage range is from 3V to 28V. Input capacitors between HSD and the
power ground (PGND) are required.
Enable (input): A logic level control of the output. The EN pin is CMOS-compatible. Logic high or floating
= enable, logic low = shutdown. In the off state, supply current of the device is greatly reduced (typically
0.8mA).
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 adjust the desired output
voltage.
Signal ground. GND is the ground path for the device input voltage V
IN
and the control circuitry. The loop
for the signal ground should be separate from the power ground (PGND) loop.
Input Voltage (input): Power to the internal reference and control sections of the MIC2164/-2/-3. The IN
operating voltage range is from 3V to 5.5V. A 1µF and 0.1µF ceramic capacitors from IN to GND are
recommended for clean operation.
Low-Side Drive (output): High-current driver output for external low-side MOSFET. The DL driving
voltage swings from ground-to-IN.
Power Ground. PGND is the ground path for the MIC2164/-2/-3 buck converter power stage. The PGND
pin connects to the sources of low-side N-Channel MOSFETs, the negative terminals of input capacitors,
and the negative terminals of output capacitors. The loop for the power ground should be as small as
possible and separate from the Signal ground (GND) loop.
High-Side Drive (output): High-current driver output for external high-side MOSFET. The DH driving
voltage is floating on the switch node voltage (LX). It swings from ground to V
IN
minus the diode drop.
Adding a small resistor between DH pin and the gate of the high-side N-channel MOSFETs can slow
down the turn-on and turn-off time of the MOSFETs.
2
EN
3
4
5
6
FB
GND
IN
DL
7
PGND
8
DH
September 2010
2
M9999-091310-D
Micrel, Inc.
MIC2164/-2/-3/C
Pin Description (Continued)
Pin Number
Pin Name
Pin Function
Switch Node and Current Sense input: High current output driver return. The LX pin connects directly
to the switch node. Due to the high speed switching on this pin, the LX pin should be routed away from
sensitive nodes. LX 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 LX using a Kelvin connection.
Boost (output): Bootstrapped voltage to the high-side N-channel MOSFET driver. A Schottky diode is
connected between the IN pin and the BST pin. A boost capacitor of 0.1μF is connected between the
BST pin and the LX pin. Adding a small resistor in series with the boost capacitor can slow down the
turn-on time of high-side N-Channel MOSFETs.
9
LX
10
BST
September 2010
3
M9999-091310-D
Micrel, Inc.
MIC2164/-2/-3/C
Absolute Maximum Ratings
(1)
IN, FB, EN to GND ..........................................
−0.3V
to +6V
BST to LX .......................................................
−-0.3V
to +6V
BST to GND ..................................................
−0.3V
to +37V
DH to LX............................................−0.3V to (V
BST
+ 0.3V)
DL, COMP to GND..............................
−0.3V
to (V
IN
+ 0.3V)
HSD to GND....................................................
−0.3V
to 31V
PGND to GND ..............................................
−0.3V
to +0.3V
Junction Temperature .............................................. +150°C
Storage Temperature (T
S
).........................−65°C to +150°C
Lead Temperature (soldering, 10sec)........................ 260°C
Operating Ratings
(2)
Input Voltage (V
IN
)............................................ 3.0V to 5.5V
Supply Voltage (V
HSD
) ....................................... 3.0V to 28V
Operating Temperature Range .................
−40°C
to +125°C
Junction Temperature (T
J
) ........................
−40°C
to +125°C
Junction Thermal Resistance
MSOP (θ
JA
) ..................................................130.5°C/W
Continuous Power Dissipation (T
A
= 70°C)..............421mW
(derate 5.6mW/°C above 70°C)
Electrical Characteristics
(4)
V
BST
−
V
LX
= 5V; T
A
=
+25°C,
unless noted. Bold values indicate
−40°C
≤
T
J
≤
+125°C.
Parameter
General
Operating Input Voltage (V
IN
)
(5)
HSD Voltage Range (V
HSD
)
Quiescent Supply Current
Standby Supply Current
(6)
Under-Voltage Lockout Trip Level
UVLO Hysteresis
DC-DC Controller
Output-Voltage Adjust Range
(V
OUT
)
Error Amplifier
FB Regulation Voltage
0°C
≤
T
J
≤
85°C
−40°C
≤
T
J
≤
125°C
T
J
= 25°C (MIC2164C)
FB Input Leakage Current
V
FB
= 0.8V
Current-Limit Threshold
V
FB
= 0V
V
FB
= 0.8V (MIC2164C)
V
FB
= 0V (MIC2164C)
Soft-Start
Soft-Start Period
Oscillator
MIC2164C
Switching Frequency
(8)
MIC2164
MIC2164-2
MIC2164-3
0.202
0.225
0.45
0.75
0.27
0.3
0.6
1
0.338
0.375
0.75
1.25
MHz
6
ms
103
19
95
15
-1
-2
-3
5
130
48
130
48
1
2
3
500
162
77
170
80
mV
nA
%
0.8
5.5
V
(V
FB
= 1.5V, output switching but excluding
external MOSFET gate current)
V
IN
= V
BST
= 5.5V, V
HSD
= 28, LX = unconnected,
EN = GND
2.4
3.0
3.0
1.4
0.8
2.7
50
5.5
28
3.0
2
3
V
V
mA
mA
V
mV
Condition
Min.
Typ.
Max.
Units
September 2010
4
M9999-091310-D
Micrel, Inc.
MIC2164/-2/-3/C
Electrical Characteristics
(4)
(Continued)
V
BST
−
V
LX
= 5V; T
A
=
+25°C,
unless noted. Bold values indicate
−40°C
≤
T
J
≤
+125°C.
Parameter
Maximum Duty Cycle
(9)
Minimum Duty Cycle
FET Drives
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
LX Leakage Current
HSD Leakage Current
Thermal Protection
Over-Temperature Shutdown
Over-Temperature Shutdown
Hysteresis
Shutdown Control
EN Logic Level Low
EN Logic Level High
EN Pull-Up Current
Note:
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, 1.5k in series with 100pF.
4. Specification for packaged product only.
5. The application is fully functional at low IN (supply of the control section) if the external MOSFETs have enough low voltage V
TH
.
6. The current will come only from the internal 100kΩ pull-up resistor sitting on the EN Input and tied to IN.
8. Measured in test mode.
9. Measured at DH. The maximum duty cycle is limited by the fixed mandatory off time T
OFF
of typical 363ns.
Condition
MIC2164/ MIC2164C
MIC2164-2
MIC2164-3
Measured at DH, V
FB
= 1V
I
SINK
= 10mA
I
SOURCE
= 10mA
Min.
Typ.
87
74
66
0
Max.
Units
%
%
0.1
V
IN
−
0.1V
or
V
BST
−
0.1V
2.1
1.8
1.8
1.2
3.3
3.3
3.3
2.3
50
20
155
10
V
V
Ω
Ω
Ω
Ω
µA
µA
°C
°C
V
LX
= 28V, V
IN
= 5.5V,V
BST
= 33.5V
V
LX
= 28V, V
IN
= 5.5V,V
BST
= 33.5V
3V < V
IN
<5.5V
3V < V
IN
<5.5V
0.4
0.8
0.9
50
1.2
V
V
µA
September 2010
5
M9999-091310-D
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