Control IC. MIC2183 Datasheet

MIC2183 IC. Datasheet pdf. Equivalent

MIC2183 Datasheet
Recommendation MIC2183 Datasheet
Part MIC2183
Description Low Voltage Synchronous Buck PWM Control IC
Feature MIC2183; MIC2183 Micrel, Inc. MIC2183 Low Voltage Synchronous Buck PWM Control IC General Description Micre.
Manufacture Micrel Semiconductor
Datasheet
Download MIC2183 Datasheet





Micrel Semiconductor MIC2183
MIC2183
Micrel, Inc.
MIC2183
Low Voltage Synchronous Buck PWM Control IC
General Description
Micrel’s MIC2183 is a high efficiency PWM synchronous
buck control IC. With its wide input voltage range of 2.9V to
14V, the MIC2183 can be used to efficiently step voltages
down in 1- or 2-cell Li Ion battery powered applications, as
well as in fixed 3.3V, 5V, or 12V systems.
Efficiencies over 90% are achievable over a wide range of
load conditions with the MIC2183’s PWM control scheme.
The operating frequency can be divided by two by raising the
FREQ/2 pin to VDD. This allows the user to optimize efficiency
versus board space. It also allows the MIC2183 to be exter-
nally synchronized to frequencies below its nominal 400KHz.
The MIC2183 features an oscillator output, FreqOut, which
can be used to implement a simple charge pump in low
voltage applications. The output of the charge pump can be
fed into the gate drive power circuitry via the VINP pin. This
feature allows enhanced gate drive, hence higher efficiencies
at low input voltages.
MIC2183 also features a 1µA shutdown mode, and a pro-
grammable undervoltage lockout, making it well-suited for
portable applications.
The MIC2183 is available in 16-pin SOP and QSOP packag-
ing options with a junction temperature range from -40°C to
+125°C.
Features
• Input voltage range: 2.9V to 14V
• >90% efficiency
• Oscillator frequency of 400kHz
• Frequency divide-by-two pin
• Frequency sync to 600kHz
• FreqOut oscillator output allows simple charge pump
implementation in low voltage systems
• Front edge blanking
• 5output drivers (typical)
• Soft start
• PWM current mode control
• 1µA shutdown current
• Cycle-by-cycle current limiting
• Frequency foldback short circuit protection
• Adjustable under-voltage lockout
• 16-pin narrow-body SOP and QSOP package options
Applications
• 3.3V to 2.5V/1.8V/1.5V conversion
• DC power distribution systems
• Wireless modems
• ADSL line cards
• 1-and 2-cell Li Ion battery operated equipment
• Satellite Phones
Typical Application
VIN = 3.3V
120µF (x2)
6.3V
1 VINA
16
VINP
7 EN/UVLO
2 FreqOut
15 FREQ/2 MIC2183
10 VDD
4 COMP
3 SS
11 SYNC
SGND
5
CSH 9
CSL 8
OUTP 14
1nF
Si9804DY
(x2)
OUTN 13
PGND 12
FB 6
15m
Si9803DY(x2)
4.7µH
B130
2.5VVO@UT5A
220µF (x2)
6.3V
100
95
90
85
80
75
70
65
60
55
500
MIC2183 EFFICIENCY
VIN = 3.3V
VOUT = 2.5V
fS = 200kHz
12345
OUTPUT CURRENT (A)
Adjustable Output Synchronous Buck Converter
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
April 2005
1 M9999-042205



Micrel Semiconductor MIC2183
MIC2183
Ordering Information
Part Number
Standard
Pb-Free
MIC2183BM MIC2183YM
MIC2183BQS MIC2183YQS
Output
Voltage
Adj.
Adj.
Frequency
200/400KHz
200/400KHz
Micrel, Inc.
Junction
Temp. Range
–40°C to +125°C
–40°C to +125°C
Package
16-lead SOP
16-lead QSOP
Pin Configuration
VINA 1
FreqOut 2
SS 3
COMP 4
SGND 5
FB 6
EN/UVLO 7
CSL 8
16 VINP
15 FREQ/2
14 OUTP
13 OUTN
12 PGND
11 SYNC
10 VDD
9 CSH
16 Lead SOIC (M)
16 Lead QSOP (QS)
M9999-042205
2
April 2005



Micrel Semiconductor MIC2183
MIC2183
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
VINA
FreqOut
SS
COMP
SGND
FB
EN/UVLO
CSL
CSH
VDD
SYNC
PGND
OUTN
OUTP
FREQ/2
VINP
Micrel, Inc.
Pin Function
Analog voltage input voltage to the circuit. This powers up the analog
sections of the die and does not need to be the same voltage as Pin 16
(VINP).
This provides a digital signal output signal at half the switching frequency.
This signal swings from 0 to 3V, and can be used to drive an external
capacitive doubler to provide a higher voltage to the VINP input.
Soft start reduces the inrush current and delays and slows the output voltage
rise time. A 5µA current source will charge the capacitor up to VDD. A 1µF
capacitor will soft start the switching regulator in 1.5ms.
Compensation (Output): Internal error amplifier output. Connect to a
capacitor or series RC network to compensate the regulator’s control loop.
Small signal ground: must be routed separately from other grounds to the (-)
terminal of COUT.
Feedback Input - the circuit regulates this pin to 1.245V.
Enable/UnderVoltage Lockout (input): A low level on this pin will power down
the device, reducing the quiescent current to under 5uA. This pin has two
separate thresholds, below 1.5V the output switching is disabled, and below
0.9V the part is forced into a complete micropower shutdown. The 1.5V
threshold functions as an accurate undervoltage lockout (UVLO) with 140mV
hysteresis.
The (-) input to the current limit comparator. A built in offset of 100mV
between CSH and CSL in conjunction with the current sense resistor sets
the current limit threshold level. This is also the (-) input to the current
amplifier.
The (+) input to the current limit comparator. A built in offset of 100mV
between CSH and CSL in conjunction with the current sense resistor sets
the current limit threshold level. This is also the (+) input to the current
amplifier.
3V internal linear-regulator output. VDD is also the supply voltage bus for the
chip. Bypass to SGND with 1µF.
Frequency Synchronization (Input): Connect an external clock signal to
synchronize the oscillator. Leading edge of signal above 1.5V starts the
switching cycle. Connect to SGND if not used.
MOSFET driver power ground, connects to source of synchronous MOSFET
and the (-) terminal of CIN.
High current drive for synchronous N channel MOSFET. Voltage swing is
from ground to VINP. On-resistance is typically 5.
High current drive for high side P channel MOSFET. Voltage swing is from
ground to VINP. On-resistance is typically 5.
When this is low, the oscillator frequency is 400KHz. When this pin is raised
to VDD, the oscillator frequency is 200KHz.
Power Input voltage to the circuit. The output gate drivers are powered from
this supply. The current sense resistor RCS should be connected as close as
possible to this pin.
April 2005
3 M9999-042205





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