MIC2295YD5 [MICREL]
High Power Density 1.2A Boost Regulator; 高功率密度1.2A升压稳压器
| 型号： | MIC2295YD5 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | High Power Density 1.2A Boost Regulator |
| 文件： | 总13页 (文件大小：1263K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC2295
High Power Density 1.2A Boost Regulator
Features
General Description
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2.5V to 10V input voltage range
Output voltage adjustable to 34V
1.2A switch current
1.2MHz PWM operation
Stable with small size ceramic capacitors
High efficiency
Low input and output ripple
<1mA shutdown current
UVLO
The MIC2295 is a 1.2Mhz, PWM dc/dc boost
switching regulator available in low profile Thin
SOT23 and 2mm x 2mm MLFꢀ package options.
High power density is achieved with the MIC2295’s
internal 34V / 1.2A switch, allowing it to power large
loads in a tiny footprint.
The MIC2295 implements constant frequency
1.2MHz PWM current mode control. The MIC2295
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.
Output over-voltage protection (MIC2295BML)
Over temperature shutdown
Thin SOT23-5 package option
2mm x 2mm leadless 8-lead MLFꢀ package
option
•
–40oC to +125oC junction temperature range
Applications
The MIC2295 is available in a low-profile Thin
SOT23 5-lead package and a 2mm x2mm 8-lead
MLFꢀ leadless package. The 2mm x 2mm MLFꢀ
package option has an output over-voltage
protection feature.
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Organic EL power supplies
3.3V to 5V/500mA conversion
TFT-LCD bias supplies
Flash LED drivers
Positive and negative output regulators
SEPIC converters
The MIC2295 has an operating junction temperature
range of –40°C to +125°C
Positive to negative Cuk converters
12V supply for DSL applications
Multi-output dc/dc converters
L1
10µH
VOUT
5V/500mA
VOUT
15V/100mA
10µH
MIC2295 BD5
MIC2295BML
SW
VIN
1-Cell
Li Ion
R1
VIN
VIN
SW
R1
100k
10k
OVP
FB
VIN
1-Cell
Li Ion
EN
10µF
FB
EN
3V to 4.2V
C1
2.2µF
2.2µF
C1
2.2µF
R2
9.01K
R2
3.3k
AGND PGND
GND
MLF and MicroLeadFrame is a trademark of Amkor Technology
July 2004
M9999-072204
(408) 955-1690
Micrel
MIC2295
Ordering Information
Output Over
Voltage
Protection
Junction
Temperature
Range
Package
Part Number
Marking Code
Standard
Standard
Lead-Free
Lead-Free
Thin SOT23-
5
-40°C to 125°C
-40°C to 125°C
MIC2295BD5 MIC2295YD5
MIC2295BML MIC2295YML
-
SVAA
SXA
SVAA
SXA
2mm x2mm
MLF-8L
34V
Pin Configuration
Pin Description
MIC2295BD5
MIC2295BML
Pin Name
Pin Function
Thin SOT-23-5
2x2 MLF-8L
1
2
3
7
6
3
SW
GND
FB
Switch Node (Input): Internal power BIPOLAR collector.
Ground (Return): Ground.
Feedback (Input): 1.24V output voltage sense node.
VOUT = 1.24V ( 1 + R1/R2)
4
5
EN
Enable (Input): Logic high enables regulator. Logic low
shuts down regulator.
2
1
VIN
OVP
Supply (Input): 2.5V to 10V input voltage.
Output Over-Voltage Protection (Input): Tie this pin to
VOUT to clamp the output voltage to 34V maximum in fault
conditions. Tie this pin to ground if OVP function is not
required.
5
4
8
N/C
No connect. No internal connection to die.
Analog ground
Power ground
AGND
PGND
GND
EP
Ground (Return). Exposed backside pad.
July 2004
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Micrel
MIC2295
Absolute Maximum Rating (1)
Supply voltage (VIN) ……………………..…
Switch voltage (VSW) ……………………
Enable pin voltage (VEN) …………..……..…. -0.3 to VIN
FB Voltage
Operating Range (2)
Supply Voltage (VIN) …………………..…… 2.5V to 10V
Junction Temperature Range (TJ) …… -40°C to +125°C
Package Thermal Impedance
12V
-0.3V to 34V
ꢀJA 2x2 MLF-8L lead ……………………
93°C/W
(VFB)……...………………………..…………6V
Switch Current (ISW) ………………………..…..….. 2.5A
Ambient Storage Temperature (TS) …. -65°C to +150°C
ESD Rating(3)...………………………… ……..2KV
ꢀJA ThinSOT23-5 lead …………………… 256°C/W
Electrical Characteristics TA=25oC, VIN =VEN = 3.6V, VOUT = 15V, IOUT = 40mA, unless otherwise noted. Bold values
indicate -40°C ꢁ TJ ꢁ 125°C.
Symbol Parameter
VIN Supply Voltage Range
VUVLO
IVIN
Condition
Min
2.5
1.8
Typ
Max
Units
10
2.4
5
V
V
Under-Voltage Lockout
Quiescent Current
Shutdown Current
Feedback Voltage
2.1
2.8
0.1
VFB = 2V (not switching)
VEN = 0V(4)
mA
mA
ISD
1
VFB
(+/-1%)
1.227
1.24
1.252
V
(+/-2%) (Over Temp)
1.215
1.265
Feedback Input Current
Line Regulation
IFB
VFB = 1.24V
-450
0.04
nA
%
%
%
3V ꢁ VIN ꢁ 5V
5mA ꢁ IOUT ꢁ 40mA
1
Load Regulation
1.5
DMAX
Maximum Duty Cycle
85
90
ISW
Switch Current Limit
Note 5
1.2
1.7
600
0.01
A
VSW
ISW
Switch Saturation Voltage
Switch Leakage Current
ISW = 1.2A
mV
mA
VEN = 0V, VSW = 10V
5
TURN ON
TURN OFF
VEN = 10V
1.5
VEN
Enable Threshold
V
0.4
40
IEN
Enable Pin Current
20
1.2
32
mA
MHz
V
fSW
VOVP
Tj
Oscillator Frequency
1.05
30
1.35
34
Output over-voltage protection
MIC2295BML only
Hysteresis
°C
150
10
Over-Temperature Threshold
Shutdown
°C
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, TJ(Max), the junction-to-ambient thermal resistance, ꢀ JA, and the ambient temperature, TA. The maximum
allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
2. This device is not guaranteed to operate beyond its specified operating rating.
3. IC devices are inherently ESD sensitive. Handling precautions required. Human body model rating: 1.5K in series with 100pF.
4.
ISD = IVIN.
5. Guaranteed by design.
July 2004
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M9999-052402
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Micrel
MIC2295
Typical Characteristics
C3
MIC2295 -5V Output
80
1uF/16V
L1
VOUT = -5V @ 0.15A
VIN = 5V
L2
75
70
65
60
55
1
5
SW
VIN
CMHSH5-2L
C1
1 F/
6.3V
C2
MIC2295BML
4.7uF/
6.3V
4
EN
OVP
50
Vin=4V
3
45
FB
Vin=5V
R3
R1
10K
40
Vin=5.5V
GND
2
10K
35
30
0
100
200
300
Output Current
L1 = Murata LQH32CN4R7M23
L2 = Murata LQH32CN4R7M23
C4
1uF/
6.3V
MIC6211
+
-
R2
2.49K
Sumida
CDRH4D18
4.7µH
15V Short circuit
protected Boost
VOUT = 15V / 50mA
85
80
75
70
65
60
0.1uF/
6.3V
1
5
SW
VIN
10µF/
6.3V
4.7µF/
25V
160K
10K
MIC2295
1-Cell
Li Ion
4
EN
3
FB
Vin=2.5
V
GND
2
Vin=3V
0
20
40
60
80
100
CIN = JMK212BJ106MG (Taiyo Yuden)
OUTPUT CURRENT (mA)
July 2004
4
M9999-052402
(408) 955-1690
Micrel
MIC2295
C3
L1
MIC2295 SEPIC 5V Output
1uF/16V
MBRX140
VOUT = 5V @ 0.3A
4.7uH
VIN = 3.3V to 5.5V
78
1
5
76
74
72
70
68
66
64
4.7uH
L2
C4
R1
43.2K
SW
VIN
470pF/
10V
C1
F/
6.3V
C2
MIC2295BML
4.7uF/
6.3V
4
EN
3
Vin=3V
FB
Vin=3.5V
Vin=4V
GND
2
Vin=5V
R2
14.3K
Vin=5.5V
0
50
100
150
200
250
OUTPUT CURRENT (mA)
L1 = Murata LQH32CN4R7M23
L2 = Murata LQH32CN4R7M23
C3
5V MIC2295 SEPIC with one
coupled inductor
L1
1uF/16V
M BRX140
VI N =3.3V to5. 5 V
4.7uH
VOUT =5V @0.3A
80
75
70
65
60
55
50
45
40
35
30
5
1
4. 7 u H
L1
R1
C4
VI N
SW
C1
44..7 µF/
6.3V
43.2K
470pF/
10V
C 2
4.7uF/
6. 3 V
M IC2295BM L
4
EN
3
FB
G N D
2
Vin=2.5
V
R2
14.3K
Vin=3.3
V
Vin=5V
0
50
100
150
200
250
300
LOAD CURRENT (mA)
L 1= Sumida CL5SD11/HP
Input Voltage
vs. Supply Voltage
MIC2295 12V output Efficiency
90
Max Duty Cycle vs Input Voltage
1.5
1.3
1.1
0.9
0.7
0.5
100
85
80
75
95
90
85
80
75
70
70
Vin=3.3V
Vin=4.2V
65
Vin=3.6V
60
2.5
4
5.5
7
8.5
10
0
50
100
150
200
2.5
4
5.5
7
8.5
10
SUPPLY VOLTAGE (V)
OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
Switch Voltage
vs. Supply Voltage
MIC2295 15V output Efficiency
Feedback Voltage
vs. Temperature
90
300
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
85
80
75
250
200
150
100
50
70
Vin=3.3V
Vin=4V
Vin=4.2V
65
0
2.5
60
4.5
6.5
8.5
0
50
100
150
200
-40 -20
0
20 40 60 80 100 120
Input Voltage (V)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
July 2004
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Micrel
MIC2295
Frequency
Current Limit
Load Regulation
vs. Temperature
vs. Temperature
1.4
1.3
1.2
1.1
1.0
0.9
0.8
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
12.2
12.15
12.1
12.05
12
11.95
11.9
VIN = 3.6V
11.85
11.8
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
0
25 50 75 100 125 150
LOAD (mA)
TEMPERATURE (°C)
Maximum Duty Cycle
vs. Supply Voltage
FB Pin Current
vs. Temperature
100
98
96
94
92
90
88
86
84
82
80
700
600
500
400
300
200
100
0
-40 -20
0
20 40 60 80 100 120
2.5
4
5.5
7
8.5
10
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
July 2004
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MIC2295
Switching Waveforms
Line Transient Response
Output Voltage
Inductor Current
(10µH)
4.2V
VSW
3.6VIN
12VOUT
150mA
3.2V
12VOUT
150mA Load
Time (400ns/div)
Time (400µs/div)
Enable Characteristics
=3.6V
V
IN
3.6V
IN
12V
OUT
150mA Load
TIME (400µs/div.)
July 2004
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M9999-052402
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Micrel
MIC2295
the output of the slope compensation ramp
generator. This summed current-loop signal is fed to
one of the inputs of the PWM generator.
Functional Description
The MIC2295 is a high power density, PWM dc/dc
boost regulator. The block diagram is shown in
Figure 1. The MIC2295 is composed of an oscillator,
slope compensation ramp generator, current
amplifier, gm error amplifier, PWM generator, and a
1.2A bipolar output transistor. The oscillator
generates a 1.2MHz clock. The clock’s two functions
are to trigger the PWM generator that turns on the
output transistor, and to reset the slope
compensation ramp generator. The current amplifier
is used to measure the switch current by amplifying
the voltage signal from the internal sense resistor.
The output of the current amplifier is summed with
The gm error amplifier measures the feedback
voltage through the external feedback resistors and
amplifies the error between the detected signal and
the 1.24V reference voltage. The output of the gm
error amplifier provides the voltage-loop signal that
is fed to the other input of the PWM generator.
When the current-loop signal exceeds the voltage-
loop signal, the PWM generator turns off the bipolar
output transistor. The next clock period initiates the
next switching cycle, maintaining constant frequency
current-mode PWM control
VIN
FB
OVP*
EN
MIC2295
OVP*
SW
PWM
Generator
gm
VREF
1.24V
Σ
CA
1.2MHz
Oscillator
Ramp
Generator
GND
*
OVP available on MLFTM package option only.
MIC2295 Block Diargam
July 2004
8
M9999-052402
(408) 955-1690
Micrel
MIC2295
switch at full duty-cycle in an attempt to maintain the
feedback voltage. As a result the output voltage will
climb out of control. This may cause the switch
node voltage to exceed its maximum voltage rating,
possibly damaging the IC and the external
components. To ensure the highest level of
protection, the MIC2295 OVP pin will shut the switch
off when an over-voltage condition is detected
saving itself and other sensitive circuitry
downstream.
Application Information
DC to DC PWM Boost Conversion
The MIC2295 is a constant frequency boost
converter. It operates by taking a DC input voltage
and regulating a higher DC output voltage. Figure 2
shows a typical circuit.
L1
D1
10uH
1A/40V
Vout
Vin
Schottky
SW
OVP
VIN
EN
Component Selection
MIC2288BML
R1
R2
C2
10uF
FB
Inductor
GND
Inductor selection is a balance between efficiency,
stability, cost, size and rated current. For most
applications a 10uH is the recommended inductor
value. It is usually a good balance between these
considerations. Efficiency is affected by inductance
value in that larger inductance values reduce the
peak to peak ripple current. This has an effect of
reducing both the DC losses and the transition
losses.
There is also a secondary effect of an inductors DC
resistance (DCR). The DCR of an inductor will be
higher for more inductance in the same package
size. This is due to the longer windings required for
an increase in inductance. Since the majority of
input current (minus the MIC2295 operating current)
is passed through the inductor, higher DCR
inductors will reduce efficiency.
Gnd
Gnd
Figure 2. Typical Application
Boost regulation is achieved by turning on an
internal switch, which draws current through the
inductor (L1). When the switch turns off, the
inductor’s magnetic field collapses, causing the
current to be discharged into the output capacitor
through an external Schottkey diode (D1). Voltage
regulation is achieved my modulating the pulse
width or pulse width modulation (PWM).
Duty Cycle Considerations
Duty cycle refers to the switch on-to-off time ratio
and can be calculated as follows for a boost
regulator;
V
Also, to maintain stability, increasing inductor size
will have to be met with an increase in output
capacitance. This is due to the unavoidable “right
half plane zero” effect for the continuous current
boost converter topology. The frequency at which
the right half plane zero occurs can be calculated as
IN
D = 1ꢀ
V
OUT
The duty cycle required for voltage conversion
should be less than the maximum duty cycle of 85%.
Also, in light load conditions where the input voltage
is close to the output voltage, the minimum duty
cycle can cause pulse skipping. This is due to the
energy stored in the inductor causing the output to
overshoot slightly over the regulated output voltage.
During the next cycle, the error amplifier detects the
output as being high and skips the following pulse.
This effect can be reduced by increasing the
minimum load or by increasing the inductor value.
Increasing the inductor value reduces peak current,
which in turn reduces energy transfer in each cycle.
follows;
2
V
IN
Frhpz =
V
OUT ꢀL ꢀIOUT ꢀ 2ꢁ
The right half plane zero has the undesirable effect
of increasing gain, while decreasing phase. This
requires that the loop gain is rolled off before this
has significant effect on the total loop response. This
can be accomplished by either reducing inductance
(increasing RHPZ frequency) or increasing the
output capacitor value (decreasing loop gain).
Over Voltage Protection
Output Capacitor
For MLF package of MIC2295, there is an over
voltage protection function. If the feedback resistors
are disconnected from the circuit or the feedback pin
is shorted to ground, the feedback pin will fall to
ground potential. This will cause the MIC2295 to
Output capacitor selection is also a trade-off
between performance, size and cost. Increasing
output capacitance will lead to an improved transient
response, but also an increase in size and cost. X5R
July 2004
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M9999-052402
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Micrel
MIC2295
Output Voltage Setting
or X7R dielectric ceramic capacitors are
recommended for designs with the MIC2295. Y5V
values may be used, but to offset their tolerance
over temperature, more capacitance is required. The
following table shows the recommended ceramic
(X5R) output capacitor value vs. output voltage.
The following equation can be used to select the
feedback resistors R1 and R2 (see figure 1).
ꢂ
ꢅ
V
OUT
R1 = R2 ꢀ
ꢁ1
ꢇ
ꢄ
ꢃ
ꢆ
1.24V
A high value of R2 can increase the whole system
efficiency, but the feedback pin input current (IFB) of
the gm operation amplifier will affect the output
voltage. An R2 value of xx KW is suitable for most
applications
Output Voltage
Recommended Output
Capacitance
10µF
<6V
4.7µF
2.2µF
<16V
<34V
Inductor Selection
In MIC2295, the switch current limit is 1.2A. The
selected inductor should handle at least 1.2A current
without saturating. The inductor should have a low
DC resistor to minimize power losses. The inductor’s
value can be 4.7uH to 10uH for most applications.
Capacitor Selection
Multi-layer ceramic capacitors are the best choice for
input and output capacitors. They offer extremely
low ESR, allowing very low ripple, and are available
in very small, cost effective packages. X5R
dielectrics are preferred. A 4.7uF to 10uF output
capacitor is suitable for most applications.
Diode Selection
The MIC2295 requires an external diode for
operation. A Schottkey diode is recommended for
most applications due to their lower forward voltage
drop and reverse recovery time. Ensure the diode
selected can deliver the peak inductor current and
the maximum reverse voltage is rated greater than
the output voltage.
Input Capacitor
A minimum 1uF ceramic capacitor is recommended
for designing with the MIC2295. Increasing input
capacitance will improve performance and greater
noise immunity on the source. The input capacitor
should be as close as possible to the inductor and
the MIC2295, with short traces for good noise
performance.
Diode Selection
For maximum efficiency, Schottky diode is
recommended for use with MIC2295. An optimal
component selection can be made by choosing the
appropriate reverse blocking voltage rating and the
average forward current rating for a given
application. For the case of maximum output voltage
(34V) and maximum output current capability, a 40V
/ 1A Schottky diode should be used.
Feedback Resistors
The MIC2295 utilizes a feedback pin to compare the
output to an internal reference. The output voltage is
adjusted by selecting the appropriate feedback
resistor values. The desired output voltage can be
calculated as follows;
Open-Circuit Protection
For MLF package option of MIC2295, there is an
output over-voltage protection function that clamps
the output to below 34V in fault conditions. Possible
fault conditions may include: if the device is
configured in a constant current mode of operation
and the load opens, or if in the standard application
the feedback resistors are disconnected from the
circuit. In these cases the FB pin will pull to ground,
causing the MIC2295 to switch with a high duty-
cycle. As a result, the output voltage will climb out of
regulation, causing the SW pin to exceed its
maximum voltage rating and possibly damaging the
IC and the external components. To ensure the
highest level of safety, the MIC2295 has a dedicated
pin, OVP, to monitor and clamp the output voltage in
over-voltage conditions. The OVP function is
offered in the 2mm x 2mm MLF-8L package option
only. To disable OVP function, tie the OVP pin to
ground
ꢁ
ꢄ
R1
V
= V
ꢀ
+1
ꢆ
ꢃ
OUT
REF
ꢂR2
ꢅ
Where Vref is equal to 1.24V.
Duty-Cycle
The MIC2295 is a general-purpose step up DC-DC
converter. The maximum difference between the
input voltage and the output voltage is limited by the
maximum duty-cycle (Dmax) of the converter. In the
case of MIC2295, DMAX = 85%. The actual duty
cycle for a given application can be calculated as
follows:
V
IN
D = 1ꢀ
V
OUT
The actual duty-cycle, D, cannot surpass the
maximum rated duty-cycle, Dmax
.
July 2004
10
M9999-052402
(408) 955-1690
Micrel
MIC2295
L1
10µH
VIN
3V to 4.2V
VOUT
9V @ 180mA
D1
MIC2295BML
R1
31.6k
VIN
SW
OVP
FB
C1
2.2µF
10V
C2
4.7µF
16V
EN
GND
R2
5k
GND
GND
3VIN - 4.2VIN to 9VOUT @ 180mA
3.3VIN to 5VOUT @ 400mA
L1
10µH
L1
10µH
VIN
3V to 4.2V
VOUT
12V @ 120mA
VIN
3V to 5V
VOUT
12V @ 120mA
D1
D1
MIC2295BML
MIC2295BML
R1
43.2k
R1
43.2k
VIN
SW
OVP
FB
VIN
SW
OVP
FB
C1
2.2µF
10V
C2
4.7µF
16V
C1
2.2µF
10V
C2
4.7µF
16V
EN
EN
GND
R2
5k
GND
R2
5k
GND
GND
GND
GND
3VIN - 4.2Vin to 12VOUT @ 120mA
3VIN – 5VIN to 12VOUT @ 120mA
L1
10µH
L1
4.7µH
VIN
3V to 5V
VOUT
12V @ 120mA
VIN
3V to 4.2V
VOUT
5V @ 400mA
D1
D1
470 pF
MIC2295BML
MIC2295BML
R1
43.2k
VIN
SW
OVP
FB
VIN
SW
OVP
FB
R1
5.62k
C1
4.7µF
6.3V
C2
4.7µF
16V
C1
2.2µF
10V
C2
2.2µF
16V
EN
EN
GND
R2
1.87k
GND
R2
5k
GND
GND
GND
GND
3VIN - 4.2VIN to 5VOUT @ 400mA
3VIN – 5VIN to 12VOUT @ 120mA
L1
10µH
L1
10µH
VIN
3V to 5V
VOUT
12V @300mA
VIN
5V
VOUT
24V@80mA
D1
D1
MIC2295BML
MIC2295BML
R1
VIN
SW
OVP
FB
R1
VIN
SW
OVP
FB
43.2k
C1
2.2µF
10V
C2
43.2k
C1
2.2µF
10V
C2
2.2µF
25V
4.7µF
16V
EN
EN
GND
R2
5k
GND
R2
5k
GND
GND
GND
GND
3VIN to 5VIN to 12VOUT @ 300mA
5VIN to 24VOUT @ 80mA
July 2004
11
M9999-052402
(408) 955-1690
Micrel
MIC2295
Package Information
8-Pin Package MLF (ML)
July 2004
12
M9999-052402
(408) 955-1690
Micrel
MIC2295
MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel
for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a
product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended
for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a
significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a
Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.
© 2004 Micrel, Incorporated.
July 2004
13
M9999-052402
(408) 955-1690
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