MIC2184BM Micrel Inc, MIC2184BM Datasheet

IC CTRLR PWM BUCK LV 16-SOIC

MIC2184BM

Manufacturer Part Number
MIC2184BM
Description
IC CTRLR PWM BUCK LV 16-SOIC
Manufacturer
Micrel Inc
Datasheet
1.MIC2184YQS.pdf (12 pages)

Specifications of MIC2184BM

Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
440kHz
Duty Cycle
100%
Voltage - Supply
2.9 V ~ 14 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
-40°C ~ 125°C
Package / Case
16-SOIC (3.9mm Width)
Frequency-max
440kHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
General Description
Micrel’s MIC2184 is a high efficiency PWM buck control IC.
With its wide input voltage range of 2.9V to 14V, the MIC2184
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 MIC2184’s PWM control scheme.
The operating frequency can be divided by two by raising the
FREQ/2 pin to V
versus board space. It also allows the MIC2184 to be exter-
nally synchronized to frequencies below its nominal 400KHz.
The MIC2184 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
allowing enhanced gate drive, hence higher efficiencies,
despite low input voltages.
MIC2184 features a 1µA shutdown mode, and a program-
mable undervoltage lockout, making it well suited for portable
applications.
The MIC2184 is available in 16 pin SOP and QSOP package
options with a junction temperture range range from –40°C
to +125°C.
Typical Application
April 2005
V
MIC2184
IN
120µF (x2)
= 3.3V
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
6.3V
Adjustable Output Buck Converter
DD
16
10
13
1
7
2
4
3
. This allows the user to optimize efficiency
VINA
EN/UVLO
FreqOut
FREQ/2
VDD
COMP
SS
VREF
SYNC
11
MIC2184
SGND
VINP
16
5
PGND
OUTP
CSH
CSL
FB
9
8
14
12
6
15mΩ
Q3
Si9803DY(x2)
4.7µH
IN
P pin,
1
2.5V @5A
Features
• Input voltage range: 2.9V to 14V
• >90% efficiency
• Oscillator frequency of 400kHz
• Frequency divide-by-two pin
• Frequency sync to 600kHz
• FrequOut oscillator output allows simple charge pump
• 1.245V reference output
• Front edge blanking
• 5Ω output driver
• 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 SOIC 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
220µF(x2)
6.3V
V
OUT
implementation in low voltage systems
Low Voltage Buck PWM Control IC
100
95
90
85
80
75
70
65
60
55
50
0
MIC2184
MIC2184 EFFICIENCY
OUTPUT CURRENT (A)
1
2
V
V
f
S
IN
OUT
= 200kHz
3
= 3.3V
= 2.5V
4
5
M9999-042205
Micrel, Inc.

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MIC2184BM Summary of contents

Page 1

MIC2184 General Description Micrel’s MIC2184 is a high efficiency PWM buck control IC. With its wide input voltage range of 2.9V to 14V, the MIC2184 can be used to efficiently step voltages down 2-cell Li Ion battery ...

Page 2

... MIC2184 Ordering Information Part Number Standard Pb-Free MIC2184BM MIC2184YM MIC2184BQS MIC2184YQS Pin Configuration M9999-042205 Output Voltage Frequency Adj. 400KHz Adj. 400KHz VINA 1 16 VINP FreqOut 2 15 FREQ OUTP COMP 4 13 VREF SGND 5 12 PGND SYNC EN/UVLO 7 10 VDD CSL 8 9 CSH ...

Page 3

MIC2184 Pin Description Pin Number Pin Name 1 VINA 2 FreqOut COMP 5 SGND EN/UVLO 8 CSL 9 CSH 10 VDD 11 SYNC 12 PGND 13 VREF 14 OUTP 15 FREQ/2 16 VINP April ...

Page 4

MIC2184 Absolute Maximum Ratings Supply Voltage ( ......................................... 15V IN IN Digital Supply Voltage (V ) ........................................... 7V DD Comp Pin Voltage (V ) ............................ –0.3V to +3V COMP Feedback Pin Voltage (V ) .......................... –0.3V to ...

Page 5

MIC2184 Parameter Condiion Soft Start Soft Start Current Current Limit Current Limit Threshold Voltage Voltage on CSH-CSL to trip current limit Error Amplifier Error Amplifier Gain Current Amplifier Current Amplifier Gain Oscillator Section Oscillator Frequency ( Maximum Duty ...

Page 6

MIC2184 Typical Characteristics Quiescent Current vs. Input Voltage 4.5 400kHz VINA VINP 3.5 3 2.5 2 200kHz 1.5 1 0.5 I STANDBY INPUT VOLTAGE (V) V vs. Load ...

Page 7

MIC2184 OUTP Drive Impedance vs. Input Voltage 4 3.5 3 2.5 SINK 2 1.5 SOURCE INPUT VOLTAGE (V) April 2005 7 Micrel, Inc. M9999-042205 ...

Page 8

MIC2184 Functional Diagram C DECOUP EN/UVLO 7 VDD 10 VDD fs/4 SYNC 11 FREQ/2 15 OSC FreqOut 2 ÷2 PWM COMPARATOR SS 3 COMP 4 VREF 13 V REF Functional Characteristics Controller Overview and Functional Description The MIC2184 is a ...

Page 9

MIC2184 The MIC2184 controller is broken down into 7 functions. • Control loop • PWM operation • Current mode control • Current limit • Reference, enable and UVLO • FreqOut • MOSFET gate drive • Oscillator and Sync • Soft-start ...

Page 10

MIC2184 MIC2184 1.5V Typical EN/UVLO 140mV (7) R2 Hysteresis (typical) Figure 3. UVLO Circuitry The line voltage turn on trip point is × INPUT ENABLE _ THRESHOLD where the voltage level of ...

Page 11

MIC2184 fied free running frequency of the MIC2184. If the synchroniz- ing frequency is lower, double pulsing of the gate drive outputs will occur. When not used, the sync pin must be connected to ground. The maximum recommended output switching ...

Page 12

... SEATING 0.0688 (1.748) PLANE 0.0532 (1.351) MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This 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. ...

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