MIC22700
1MHz, 7A Integrated Switch High-
Efficiency Synchronous Buck Regulator
General Description
The Micrel MIC22700 is a high-efficiency, 7A, integrated
switch, synchronous buck (step-down) regulator. The
MIC22700 is optimized for highest efficiency, achieving
more than 95% efficiency while still switching at 1MHz
over a broad range. The device works with a small 1µH
inductor and 100µF output capacitor. The ultra-high speed
control loop keeps the output voltage within regulation
even under extreme transient load swings commonly
found in FPGAs and low-voltage ASICs. The output
voltage can be adjusted down to 0.7V to address all low
voltage power needs. The MIC22700 offers a full range of
sequencing and tracking options. The Enable/Delay pin
combined with the Power Good/POR pin allows multiple
outputs to be sequenced in any way during turn-on and
turn-off. The RC (Ramp Control™) pin allows the device to
be connected to another product in the MIC22xxx and/or
MIC68xxx family, to keep the output voltages within a
certain ∆V on start up.
®
The MIC22700 is available in a 24-pin 4mm x 4mm MLF
with a junction operating range from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
Input voltage range: 2.6V to 5.5V
Output voltage adjustable down to 0.7V
Output load current up to 7A
Full sequencing and tracking capability
Power-on-Reset/Power Good output
Efficiency > 95% across a broad load range
Ultra-fast transient response
– Easy RC compensation
100% maximum duty cycle
Fully integrated MOSFET switches
Micropower shutdown
Thermal shutdown and current-limit protection
®
24-pin 4mm x 4mm MLF
–40°C to +125°C junction temperature range
Applications
•
•
•
•
•
•
High power density point-of-load conversion
Servers and routers
DVD recorders / Blu-Ray players
Computing peripherals
Base stations
FPGAs, DSP and low voltage ASIC power
Typical Application
Efficiency @ 3.3V
OUT
100
95
90
85
80
75
70
65
60
55
VIN = 5.5V
50
0
1234567
LOAD CURRENT (A)
MIC22700 7A 1MHz Synchronous Output Converter
Sequencing & Tracking
Ramp Control 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
February 13, 2014
Revision 2.1
Micrel, Inc.
MIC22700
Ordering Information
Part Number
MIC22700YML
Voltage
Adjustable
Junction Temperature Range
–40° to +125°C
Package
24-Pin 4mm x4mm MLF
®
Lead Finish
Pb-Free
Note:
MLF
®
is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
24-Pin 4mm x 4mm MLF (ML)
®
Pin Description
Pin Number
1, 6, 13, 18
17
2
Pin Name
PVIN
SVIN
EN/DLY
Description
Power Supply Voltage (Input): Requires bypass capacitor to GND.
Signal Power Supply Voltage (Input): Requires bypass capacitor-to-GND.
Enable/Delay (Input): When this pin is pulled higher than the enable threshold, the part will start
up. Below this voltage the device is in its low quiescent current mode. The pin has a 1µA current
source charging it to VIN. By adding a capacitor to this pin a delay may easily be generated. The
enable function will not operate with an input voltage lower than the min specified.
Ramp Control: Capacitor to ground from this pin determines slew rate of output voltage during
start-up. This can be used for tracking capability as well as soft start.
Feedback: Input to the error amplifier, connect to the external resistor divider network to set the
output voltage.
Compensation pin (Input): Place a RC to GND to compensate the device, see applications
section.
Power On Reset (Output): Open-drain output device indicates when the output is out of
regulation and is active after the delay set by the delay pin.
Power Ground: Ground
Signal Ground: Ground
Delay (Input): Capacitor to ground sets internal delay timer. Timer delays power-on reset (POR)
output at turn-on and ramp down at turn-off.
Switch (Output): Internal power MOSFET output switches.
Exposed Pad (Power): Must make a full connection to a GND plane for full output power to be
realized.
4
14
15
5
7, 12, 19, 24
16
3
8, 9, 10, 11,
20, 21, 22, 23
EP
RC
FB
COMP
POR/PG
PGND
SGND
DELAY
SW
GND
February 13, 2014
2
Revision 2.1
Micrel, Inc.
MIC22700
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .......................................... –0.3V to 6V
Output Switch Voltage (V
SW
) ............................. –0.3V to 6V
Output Switch Current (I
SW
)....................... Internally Limited
Logic Input Voltage (V
EN
V
FLG
) .......................... –0.3V to V
IN
Storage Temperature (T
s
) ......................... –65°C to +150°C
(3)
ESD Rating .................................................................. 2kV
Lead Temperature (Soldering 10s) ............................ 260°C
Operating Ratings
(2)
Supply Voltage (V
IN
) ......................................... 2.6V to 5.5V
Junction Temperature (T
J
) ..................–40°C ≤ T
J
≤ +125°C
Thermal Resistance
4x4 MLF-24 (θ
JC
) ............................................... 14°C/W
4x4 MLF-24 (θ
JA
) ............................................... 40°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
IN
= V
EN
= 3.3V; V
OUT
= 1.8V, unless otherwise specified.
Bold
values indicate –40°C< T
J
< +125°C.
Parameter
Supply Voltage Range
Under-Voltage Lockout Threshold
UVLO Hysteresis
Quiescent Current, PWM Mode
Shutdown Current
[Adjustable] Feedback Voltage
FB Pin Input Current
Current Limit
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
Switch ON-Resistance PFET
Switch ON-Resistance NFET
Oscillator Frequency
EN/DLY Threshold Voltage
EN/DLY Source Current
RC Pin I
RAMP
Power On Reset I
PG(LEAK)
Power On Reset V
PG(LO)
Power On Reset V
PG
Over-Temperature Shutdown
Over-Temperature Shutdown
Hysteresis
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.
4. Specification for packaged product only.
Condition
(turn-on)
V
EN
=>1.34V; V
FB
= 0.9V (not switching)
V
EN
= 0V
±
2% (over temperature)
V
FB
= 0.5
V
OUT
1.8V; V
IN
= 2.6 to 5.5V, I
LOAD
= 100mA
100mA < I
LOAD
< 7A, V
IN
= 3.3V
V
FB
≤
0.5V
I
SW
= 1000mA; V
FB
=0.5V
I
SW
= 1000mA; V
FB
=0.9V
Min.
2.6
2.4
Typ.
2.5
280
850
5
0.7
1
10.5
0.2
0.2
0.03
0.025
1
1.24
1
1
Max.
5.5
2.6
1300
10
0.714
16
Units
V
V
mV
µA
µA
V
nA
A
%
%
%
Ω
Ω
MHz
V
µA
µA
µA
µA
mV
0.686
7
100
V
IN
= 2.6 to V
IN
= 5.5V
Ramp Control Current
V
PORH
= 5.5V; POR = High
Output Logic-Low Voltage (undervoltage condition),
I
POR
= 5mA
Threshold, % of V
OUT
below nominal
Hysteresis
0.8
1.14
0.7
0.7
1.2
1.34
1.3
1.3
1
2
130
7.5
10
2
160
20
12.5
%
%
°C
°C
February 13, 2014
3
Revision 2.1
Micrel, Inc.
MIC22700
Typical Characteristics
February 13, 2014
4
Revision 2.1
Micrel, Inc.
MIC22700
Typical Characteristics (continued)
February 13, 2014
5
Revision 2.1
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