MIC2605/6
0.5A, 1.2MHz / 2MHz Wide Input Range
Boost Regulator with Integrated Switch
and Schottky Diode
General Description
The MIC2605/6 is a 1.2MHz/2MHz, PWM DC/DC boost
switching regulator available in a 2mm x 2mm MLF
®
package. High power density is achieved with the
MIC2605/6’s internal 40V/0.5A switch and schottky diode,
allowing it to power large loads in a tiny footprint.
The
MIC2605/6
implements
constant
frequency
1.2MHz/2MHz PWM current mode control. The MIC2605/6
offers internal compensation that offers excellent transient
response and output regulation performance. The high
frequency operation saves board space by allowing small,
low-profile external components. The fixed frequency
PWM scheme also reduces spurious switching noise and
ripple to the input power source.
The MIC2605/6 is available in an 8-pin 2mm x 2mm MLF
®
leadless package. This package has an output over-
voltage protection feature.
The MIC2605/6 has an operating junction temperature
range of –40
°
C to +125
°
C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Wide input voltage range: 4.5V to 20V
Output voltage adjustable to 40V
0.5A switch current and schottky diode
MIC2605 operates at 1.2MHz
MIC2606 operates at 2MHz
Programmable soft start
Stable with small size ceramic capacitors
High efficiency
Low input and output ripple
<10µA shutdown current
UVLO
Output over-voltage and over-temperature protection
8-pin 2mm x 2mm MLF
®
package
–40
°
C to +125
°
C junction temperature range
Applications
•
TV-tuners
•
Broadband communications
•
TFT-LCD bias supplies
•
Bias supply
•
Positive output regulators
•
SEPIC converters
•
DSL applications
•
Local boost regulators
___________________________________________________________________________________________________________
Typical Application
10µH
V
OUT
32V, 30mA
MIC2605/6
VIN
V
IN
= 12V
1µF
0.1µF
EN
VDD
SS
SW
OUT
FB
PGND
0.1µF
12.4K
90
80
70
60
50
32V
OUT
Efficiency
1µF
499
40
30
20
10
0
20
V
IN
= 12V
40
60
80
100 120
LOAD CURRENT (mA)
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
September 2009
M9999-090909-B
Micrel, Inc.
MIC2605/6
Ordering Information
Part Number
MIC2605YML
MIC2606YML
Notes
1.
2.
Overbar (
®
Marking
Code
(1)
WZ5
WZ6
Frequency
1.2MHz
2MHz
Output Over
Voltage Protection
40V
40V
Temperature Range
–40° to +125°C
–40° to +125°C
Package
(2)
Lead Finish
Pb-Free
Pb-Free
8-Pin 2mm x 2mm MLF
®
8-Pin 2mm x 2mm MLF
®
) symbol my not be to scale.
MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
VOUT
VIN
VDD
EN
1
2
3
4
8
7
6
5
PGND
SW
FB
SS
8-Pin 2mm x 2mm MLF
®
(ML)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
EP
Pin Name
VOUT
VIN
VDD
EN
SS
FB
SW
PGND
EPAD
Pin Function
Output Pin: Connect to the output capacitor.
Supply (Input): 4.5V to 20V input voltage.
Internal regulated supply. VDD should be connected to VIN when VIN
≤
7V.
Enable (Input): Logic high enables regulator. Logic low shuts down regulator.
Soft start
Feedback (Input): 1.25V output voltage sense node. V
OUT
= 1.25V (1 + R1/R2).
Switch Node (Input): Internal power BIPOLAR collector.
Power ground
Exposed backside pad for thermal cooling.
September 2009
2
M9999-090909-B
Micrel, Inc.
MIC2605/6
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .......................................................22V
Switch Voltage (V
SW
)....................................... –0.3V to 40V
Enable Voltage (V
EN
)......................................... –0.3V to V
IN
FB Voltage (V
FB
)............................................................. V
DD
Ambient Storage Temperature (T
s
) ...........–65°C to +150°C
Lead Temperature (soldering 10sec)......................... 260°C
ESD Rating
(3)
(MIC2605)................................................ 2kV
ESD Rating
(3)
(MIC2606)............................................. 1.5kV
Operating Ratings
(2)
Supply Voltage (V
IN
).......................................... 4.5V to 20V
Junction Temperature (T
J
) ........................ –40°C to +125°C
Junction Thermal Resistance
2mm x 2mm MLF-8 (θ
JA
) ...................................90°C/W
2mm x 2mm MLF-8 (θ
JC
) ...................................45°C/W
Electrical Characteristics
(4)
T
A
= 25°C, V
IN
= V
EN
= 12V; unless otherwise noted.
Bold
values indicate –40°C
≤
T
J
≤
+125°C.
Symbol
V
IN
V
DD
V
ULVO
I
Q
I
SD
V
FB
I
FB
Parameter
Input Voltage Range
Internal Regulated Voltage
Under-voltage Lockout
Quiescent Current
Shutdown Current
Feedback Voltage
Feedback Input Current
Line Regulation
Load Regulation
D
MAX
I
SW
V
SW
I
SW
V
EN
I
EN
f
SW
V
D
I
RD
V
OVP
T
J
Notes:
1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating
the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction temperature, T
J(Max)
, the
junction-to-ambient thermal resistance,
θ
JA
, and the ambient temperature, T
A
. The maximum allowable power dissipation will result in excessive die
temperature, and the regulator will go into thermal shutdown.
2. The device is not guaranteed to function outside its operating rating.
3. IC devices are inherently ESD sensitive. Handling precautions required. Human body model rating: 1.5k in series with 100pF.
4. Specification for packaged product only.
5. Connect V
DD
pin to V
IN
pin when V
IN
≤
7V.
6. I
SD
= I
VIN
.
Condition
Note 5
For V
DD
V
FB
= 2V (not switching)
V
EN
= 0V,
Note 6
(±2%)
(±3%) (over temperature)
V
FB
= 1.25V
8V
≤
V
IN
≤
14V, V
OUT
= 18V
5mA
≤
I
OUT
≤
40mA, V
OUT
= 18V,
Note 7
MIC2605
MIC2606
Note 7
I
SW
= 0.5A
V
EN
= 0V, V
SW
= 18V
Turn ON
Turn OFF
V
EN
= 12V
Min
4.5
Typ
5.8
Max
20
Units
V
V
V
mA
µA
V
V
nA
%
%
%
%
1.8
2.1
4.2
0.1
2.4
6
10
1.275
1.288
1.225
1.212
1.25
–550
0.04
1
1.5
Maximum Duty Cycle
Switch Current Limit
Switch Saturation Voltage
Switch Leakage Current
Enable Threshold
Enable Pin Current
Oscillator Frequency (MIC2605)
Oscillator Frequency (MIC2606)
Schottky Forward Drop
Schottky Leakage Current
Output Over-voltage Protection
Over-temperature Threshold
Shutdown
85
80
0.5
0.8
600
0.01
1.5
0.3
20
1.02
1.7
1.2
2
450
850
0.1
10
15
150
10
4
20
40
1.38
2.3
5
A
mV
µA
V
V
µA
MHz
MHz
mV
mV
µA
%
°C
°C
ID = 1mA
ID = 150mA
V
R
= 30V
15% Over programmed V
OUT
Hysteresis
September 2009
3
M9999-090909-B
Micrel, Inc.
7. Guaranteed by design.
MIC2605/6
September 2009
4
M9999-090909-B
Micrel, Inc.
MIC2605/6
Typical Characteristics
2.0
1.8
1.6
1.4
1.2
MIC2605
1.0
468
10 12 14 16
INPUT VOLTAGE (V)
18
Frequency
vs. Input Voltage
MIC2606
7
6
5
4
3
2
1
Quiescent Current
vs. Input Voltage
97
96
95
94
93
92
91
Max Duty Cycle
vs. Input Voltage
0
13579
No Switching FB Pin @ 2V
11 13 15 17 19
INPUT VOLTAGE (V)
90
46
EN = V
IN
81 01 21 41 61 82 0
INPUT VOLTAGE (V)
1100
1000
900
800
700
600
500
400
300
200
100
0
46
Switch Saturation Voltage
vs. Input Voltage
–50mA
–0.25A
–0.45A
–0.65A
–0.85A
–0.1A
–0.3A
–0.5A
–0.7A
–0.15A
–0.35A
–0.55A
–0.75A
–0.2A
–0.4A
–0.6A
–0.8A
81 01 21 41 61 82 0
INPUT VOLTAGE (V)
1100
1000
900
800
700
600
500
400
300
200
100
0
Switch Saturation Voltage
vs. Switch Current
–4.5V
–5V
–6V
–7V
–8V
–9V
–10V
–11V
–12V
–15V
–20
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
46
Switch Current Limit
vs. Input Voltage
EN = V
IN
81 01 21 41 61 82 0
INPUT VOLTAGE (V)
SWITCH CURRENT (mA)
Line Regulation
33.4
33.3
33.2
33.1
33.0
32.9
32.8
468
Load = 40mA
10 12 14 16 18
INPUT VOLTAGE (V)
90
80
70
60
50
40
30
20
10
0
48
32V
OUT
Efficiency
12V
IN
90
80
70
60
50
40
30
20
10
0
20
32V
OUT
Efficiency
4.5V
IN
V
IN
= 12V
40
60
80
100
LOAD CURRENT (mA)
120
12 16 20 24 28 32 36 40
LOAD CURRENT (mA)
1.266
1.264
1.262
1.260
1.258
1.256
1.254
Feedback Voltage
vs. Temperature
1.00
0.95
0.90
0.85
0.80
0.75
Switch Current Limit
vs. Temperature
1000
V
SAT
vs. Temperature
I
SW
=750mA
I
SW
=400mA
100
V
IN
= 12V
Load = 100mA
1.250
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
1.252
0.70
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
V
IN
= 12V
I
SW
=100mA
10
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
September 2009
5
M9999-090909-B
微控制器 MCU
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