MIC22602
1MHz, 6A Integrated Switch High
Efficiency Synchronous Buck Regulator
General Description
The Micrel MIC22602 is a high efficiency 6A Integrated
switch synchronous buck (step-down) regulator. The
MIC22602 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 MIC22602 offers a full range of
sequencing and tracking options. The EN/DLY 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 MIC22602 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 6A
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
Hic-cup mode current limiting
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
1
2
3
4
5
OUTPUT CURRENT (A)
6
MIC22602 6A 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
October 2009
M9999-102809-A
Micrel, Inc.
MIC22602
Ordering Information
Part Number
MIC22602YML
®
Voltage
Adj.
Junction Temp. Range
–40° to +125°C
Package
24-Pin 4x4 MLF
®
Lead Finish
Pb-Free
Note:
MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
PGND
PGND
PVIN
SVIN
EP
SGND
COMP
FB
PVIN
PGND
PGND
SW
SW
SW
SW
SW
SW
SW
SW
PVIN
EN/DLY
DELAY
RC
POR/PG
PVIN
®
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.
EN/DLY (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 minimum voltage 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. The RC pin cannot be left floating. Use a minimum capacitor value of 470pF
or larger.
Feedback: Input to the error amplifier, connect to the external resistor divider
network to set the output voltage.
Compensation pin (Input): Place a RC network 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
RC
14
15
5
7, 12, 19, 24
16
3
8, 9, 10, 11,
20, 21, 22, 23
EP
FB
COMP
POR/PG
PGND
SGND
DELAY
SW
GND
October 2009
2
M9999-102809-A
Micrel, Inc.
MIC22602
Absolute Maximum Ratings
(1)
Supply Voltage (PV
IN
, SV
IN
) .............................. –0.3V to 6V
Output Switch Voltage (V
SW
) ............................. –0.3V to 6V
Output Switch Current (I
SW
).......................Internally Limited
Logic Input Voltage (EN, POR, DLY) ................ –0.3V to V
IN
Control Voltage (RC, COMP, FB) ..................... –0.3V to V
IN
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(3)
.................................................................. 2kV
Lead Temperature (Soldering 10sec) ........................ 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
V
IN
Turn-ON Voltage Threshold
UVLO Hysteresis
Quiescent Current, PWM Mode
Shutdown Current
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 Threshold Voltage
EN 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
V
IN
Rising
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
< 6A, 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
0.2
0.2
0.03
0.025
1
1.24
1
1
Max
5.5
2.6
1300
10
0.714
14
Units
V
V
mV
µA
µA
V
nA
A
%
%
%
Ω
Ω
MHz
V
µA
µA
µA
µA
mV
0.686
6
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
October 2009
3
M9999-102809-A
Micrel, Inc.
MIC22602
Typical Characteristics
10
SHUTDOWN CURRENT (µA)
8
6
4
2
0
Shutdown Current
vs. Temperature
QUIESCENT CURRENT (µA)
V
IN
= 3.3V
No Switching
FEEDBACK VOLTAGE (V)
EN = 0V
V
IN
= 3.3V
-40
-25
-10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
-40
-25
-10
5
20
35
50
65
80
95
110
125
900
890
880
870
860
850
840
830
820
810
800
Quiescent Current
vs. Temperature
EN > 1.34V
V
FB
= 0.9V
0.6990
EN = V
IN
0.6989
V = 3.3V
0.6988
IN
AMB = 25°C
0.6987
0.6986
0.6985
0.6984
0.6983
0.6982
0.6981
0.6980
2.5
Feedback Voltage
vs. Input Voltage
TEMPERATURE (°C)
3
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
0.701
FEEDBACK VOLTAGE (V)
0.700
0.699
0.698
0.697
0.696
0.695
Feedback Voltage
vs. Temperature
ENABLE VOLTAGE (V)
V
IN
= 3.3V
EN = V
IN
-40
-25
-10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
TEMPERATURE (C)
1020
1015
FREQUENCY (kHz)
1010
1005
1000
995
990
985
Frequency
vs. Temperature
V
IN
= 3.3V
FREQUENCY (kHz)
Frequency
vs. Input Voltage
1040
1030
1020
1010
1000
990
980
2.5
3
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
R
DSON
(mOhm)
EN = V
IN
EN = V
IN
40
EN = V
IN
38
36
34
32
30
28
26
24
22
20
2.5
-40
-25
-10
5
20
35
50
65
80
95
110
125
980
TEMPERATURE (°C)
Quiescent Current
vs. Input Voltage
1200
QUIESCENT CURRENT (µA)
1100
1000
900
800
700
600
2.5
3
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
SHUTDOWN CURRENT (µA)
EN > 1.34V
V = 0.9V
FB
Shutdown Current
vs. Input Voltage
7.0
6.5
6.0
5.5
5.0
4.5
4.0
2.5
3
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
EN = 0V
No Switching
October 2009
4
-40
-25
-10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
-40
-25
-10
5
20
35
50
65
80
95
110
125
1.245
V = 3.3V
1.244
IN
1.243
1.242
1.241
1.24
1.239
1.238
1.237
1.236
1.235
Enable Voltage
vs. Temperature
ENABLE HYSTERESIS (V)
0.0100
V = 3.3V
0.0095
IN
0.0090
0.0085
0.0080
0.0075
0.0070
0.0065
0.0060
0.0055
0.0050
Enable Hysteresis
vs. Temperature
P-Channel R
DSON
vs. Input Voltage
3
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
M9999-102809-A
Micrel, Inc.
MIC22602
Typical Characteristics (continued)
Efficiency @ 1.2V
OUT
100
95
90
85
80
75
70
65
60
55
50
0
1
2
3
4
5
OUTPUT CURRENT (A)
6
100
2.6VIN
3.3VIN
5.5VIN
95
90
85
80
75
70
65
60
55
50
0
Efficiency @ 1.8V
OUT
3.3VIN
5.5VIN
2.6VIN
100
95
90
85
80
75
70
65
60
Efficiency @ 3.3V
OUT
1
2
3
4
5
OUTPUT CURRENT (A)
6
55
VIN = 5.5V
50
0
1
2
3
4
5
OUTPUT CURRENT (A)
6
100
80
60
40
20
0
-20
-40
-60
-80
-100
100
Bode Plot
(V
IN
- 3.6V, V
O
- 1.8V)
250
200
150
100
50
0
-50
-100
-150
-200
100
80
60
40
20
0
-20
-40
-60
-80
-100
100
Bode Plot
(V
IN
- 5.5V, V
O
- 1.8V)
250
200
150
100
50
0
-50
-100
-150
-200
100
80
60
40
20
0
-20
-40
-60
-80
-100
100
Bode Plot
(V
IN
- 5.0V, V
O
- 3.3V)
250
200
150
100
50
0
-50
-100
-150
-200
-250
1M
1k
10k
100k
FREQUENCY (Hz)
-250
1M
1k
10k
100k
FREQUENCY (Hz)
-250
1M
1k
10k
100k
FREQUENCY (Hz)
October 2009
5
M9999-102809-A
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