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器件描述：Low Voltage Synchronous Buck PWM Control IC Final Information
器件厂商：MICREL [Micrel Semiconductor]
厂商主页：http://www.micrel.com/
文件大小：98.22KB
文件页数：12
PDF阅读：MIC2183BM.pdf (点击阅读器件资料)
摘要：
December 10, 2001 1 MIC2183
MIC2183 Micrel
MIC2183
Low Voltage Synchronous Buck PWM Control IC
Final Information
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 V
DD
. 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 V
IN
P pin. This
feature allows enhanced gate drive, hence higher efficiencies
at low input voltages.
MIC2183 also features a 1?A 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.
Typical Application
K46K72K65K71K4FK75K74
K56K49K4EK41
K45K4EK2FK55K56K4CK4F
K56
K4FK55K54
K32K2EK35K56 K40K35K41
K46K52K45K51K2FK32
K56K44K44
K43K4FK4DK50
K53K53
K53K59K4EK43
K53K47K4EK44
K4DK49K43K32K31K38K33
K56K49K4EK50
K43K53K48
K43K53K4C
K4FK55K54K4E
K4FK55K54K50
K50K47K4EK44
K46K42
K56
K49K4E
K3D K33K2EK33K56
K31
K37
K32
K31K35
K31K30
K34
K33
K31K31
K35
K31K36
K39
K38
K31K34
K31K33
K31K32
K36
K31K32K30?K46 K28K78K32K29
K36K2EK33K56
K31K35K6D?
K31K6EK46
K53K69K39K38K30K33K44K59K28K78K32K29
K34K2EK37?K48
K53K69K39K38K30K34K44K59
K28K78K32K29
K42K31K33K30
K32K32K30?K46 K28K78K32K29
K36K2EK33K56
Adjustable Output Synchronous Buck Converter
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
?5? output drivers (typical)
? Soft start
? PWM current mode control
?1?A 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
Micrel, Inc. ? 1849 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 944-0970 ? http://www.micrel.com
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012345
EFFICIENCY (%)
OUTPUT CURRENT (A)
MIC2183 EFFICIENCY
V
IN
= 3.3V
V
OUT
= 2.5V
f
S
= 200kHz
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