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MIC2288YD5-TR

P1-P3P4-P6P7-P9P10-P11
MIC2288 Micrel, Inc.
M9999-042205 4 April 2005
Typical Characteristics
75
77
79
81
83
85
87
89
91
0255075100 125 150
EFFICIENCY (%)
OUTPUT CURRENT (mA)
Efficiency at V
OUT
= 12V
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 3.3V
11.8
11.85
11.9
11.95
12
12.05
12.1
12.15
12.2
0255075100 125 150
OUTPUT VOLTAGE (V)
LOAD (mA)
Load Re
g
ulation
V
IN
=
3.6V
1.10
1.12
1.14
1.16
1.18
1.20
1.22
1.24
1.26
1.28
1.30
-40 -20 0 20 40 60 80 100 120
FEEDBACK VOLTAGE (V)
TEMPERATURE (°C)
Feedback Voltage
vs. Tem
p
erature
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2.5 4 5.5 7 8.5 10
CURRENT LIMIT (A)
SUPPLY VOLTAGE (V)
Current Limit
vs. Su
pp
l
y
Current
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
-40 -20 0 20 40 60 80 100 120
CURRENT LIMIT (A)
TEMPERATURE (°C)
Current Limit
vs. Tem
p
erature
0
50
100
150
200
250
300
2.5 4 5.5 7 8.5 10
SWITCH SATURATION VOLTAGE (mV)
SUPPLY VOLTAGE (V)
Switch Saturation
vs. Su
pp
l
y
Volta
g
e
I
SW
= 500mA
0
100
200
300
400
500
600
700
0 200 400 600 800 1000
SWITCH SATURATION VOLTAGE (mV)
SWITCH CURRENT (mA)
Switch Saturation
vs. Current
V
IN
= 3.6V
0
100
200
300
400
500
600
700
-40 -20 0 20 40 60 80 100 120
SWITCH SATURATION VOLTAGE (mV)
TEMPERATURE (°C)
Switch Saturation
vs. Temperature
V
IN
= 3.6V
I
SW
= 500mA
0.8
0.9
1.0
1.1
1.2
1.3
1.4
-40 -20 0 20 40 60 80 100 120
FREQUENCY (MHz)
TEMPERATURE (°C)
Frequency
vs. Tem
p
erature
80
82
84
86
88
90
92
94
96
98
100
2.5 4 5.5 7 8.5 10
MAXIMUM DUTY CYCLE (%)
SUPPLY VOLTAGE (V)
Maximum Duty Cycle
vs. Supply Voltage
85
87
89
91
93
95
97
99
-40 -20 0 20 40 60 80 100 120
MAXIMUM DUTY CYCLE (%)
TEMPERATURE (°C)
Maximum Duty Cycle
vs. Temperature
V
IN
= 3.6V
0
100
200
300
400
500
600
700
-40 -20 0 20 40 60 80 100 120
FEEDBACK CURRENT (nA)
TEMPERATURE (°C)
FB Pin Current
vs. Tem
p
erature
April 2005 5 M9999-042205
MIC2288 Micrel, Inc.
Function Characteristics
Enable Characteristics
Time (400µs/div)
OUTPUT VOLTAGE
(5V/div)
ENABLE VOLTAGE
(2V/div)
3.6V
IN
12V
OUT
150mA Load
Output Voltage
Enable Voltage
Line Transient Response
Time (400µs/div)
OUTPUT VOLTAGE
(1mV/div) AC-Coupled
INPUT VOLTAGE
(2V/div)
4.2V
3.2V
12V
OUT
150mA Load
Load Transient Response
Time (400µs/div)
OUTPUT VOLTAGE
(100mV/div) AC-Coupled
LOAD CURRENT
(100mA/div)
10mA
150mA
3.6V
IN
12V
OUT
C
OUT
= 10µF
Switching Waveforms
Time (400ns/div)
OUTPUT VOLTAGE
(50mV/div)
INDUCTOR CURRENT
(500mA/div)
SWITCH SATURATION
(5V/div)
V
SW
Output Voltage
3.6V
IN
12V
OUT
150mA
Inductor Current
(10µH)
MIC2288 Micrel, Inc.
M9999-042205 6 April 2005
Functional Description
The MIC2288 is a constant frequency, PWM current mode
boost regulator. The block diagram is shown in Figure 1. The
MIC2288 is composed of an oscillator, slope compensation
ramp generator, current amplifier, g
m
error amplifier, PWM
generator, and a 1A 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 output
of the slope compensation ramp generator. This summed
current-loop signal is fed to one of the inputs of the PWM
generator.
Functional Diagram
GND
CA
PWM
Generator
Ramp
Generator
1.2MHz
Oscillator
SW
ENFB
OVP*VIN
1.24V
*
OVP available on MLF
TM
package option only.
g
m
OVP*
Σ
V
R
E
F
Figure 1. MIC2288 Block Diagram
The g
m
error amplifier measures the feedback voltage through
the external feedback resistors and amplifies the error be-
tween the detected signal and the 1.24V reference voltage.
The output of the g
m
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 sig-
nal, the PWM generator turns off the bipolar output transistor.
The next clock period initiates the next switching cycle,
maintaining the constant frequency current-mode PWM con-
trol.
P1-P3P4-P6P7-P9P10-P11

MIC2288YD5-TR

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Buy MIC2288YD5-TR
Manufacturer:
Description:
Switching Voltage Regulators 1.2MHz PWM Boost Converter 1.2A
Lifecycle:
New from this manufacturer.
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