MIC2194 Datasheet PDF - MICREL

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MIC2194
MICREL

Part Number MIC2194
Description 400kHz SO-8 Buck Control IC
Page 10 Pages


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MIC2194
MIC2194
400kHz SO-8 Buck Control IC
Micrel
General Description
Micrel’s MIC2194 is a high efficiency PWM buck control IC
housed in the SO-8 package. Its 2.9V to 14V input voltage
range allows it to efficiently step down voltages in 3.3V, 5V,
and 12V systems as well as 1- or 2-cell Li Ion battery powered
applications. The flexible architecture of the MIC2194 allows
for it to be configured as a buck or a buck-boost converter.
The MIC2194 solution saves valuable board space. The
device is housed in the space-saving SO-8 package, whose
low pin-count minimizes external components. Its 400kHz
PWM operation allows a small inductor and small output
capacitors to be used. The MIC2194 can implement all-
ceramic capacitor solutions.
The MIC2194 drives a high-side P-channel MOSFET. A low
output driver impedance of 2allows the MIC2194 to drive
large external MOSFETs to generate a wide range of output
currents. The MIC2194 can achieve maximum duty cycles of
100%, which can be useful in low headroom applications.
The MIC2194 is available in an 8 pin SOIC package with a
junction temperature range of –40°C to +125°C.
Features
2.9V to 14V input voltage range
400kHz oscillator frequency
PWM current mode control
2output drivers
100% maximum duty cycle
0.5µA micro-power shutdown
Programmable UVLO
Front edge blanking
Cycle-by-cycle current limiting
Frequency foldback short circuit protection
8-lead SOIC package
Applications
Point of load power supplies
Negative voltage buck-boost power supplies
Distributed power systems
Base stations
Wireless modems
ADSL line cards
Servers
Step down conversion in 3.3V, 5V, 12V systems
1-and 2-cell Li Ion battery operated equipment
Typical Application
VIN
12V
47µF
20V
(×2)
1µF
2.2nF
0.012
MIC2194BM
VIN CS
EN/
UVLO
OUTP
VDD
FB
2k COMP GND
Si4431A
(×2)
5.2µH
B530 10k
3.32k
VOUT
5V, 5A
220µF
10V
(×2)
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Adjustable Output Buck Converter
VIN
+3.3V
0.040
Si9803
22µH
10µF
16V
10µF
16V
1µF
10nF
MIC2194BM
VIN CS
EN/
UVLO
OUTP
VDD
FB
4.99k COMP GND
B530
3.01k
1k
22nF
220µF
10V
(×2)
VOUT
5V, 0.6A
Positive-to-Negative Buck-Boost 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
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MIC2194
Ordering Information
Part Number
Standard
MIC2194BM
Lead-Free
MIC2194YM
Output Voltage
Adjustable
Micrel
Frequency Junction Temp. Range Package
400kHz
40°C to +125°C
8-lead SOP
Pin Configuration
COMP 1
FB 2
EN/UVLO 3
CS 4
8 VIN
7 OUTP
6 GND
5 VDD
8 Lead SOIC (M)
Pin Description
Pin Number
1
2
3
Pin Name
COMP
FB
EN/UVLO
4
5
6
7
8
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CS
VDD
GND
OUTP
VIN
Pin Function
Compensation (Output): Internal error amplifier output. Connect to a
capacitor or series RC network to compensate the regulators control loop.
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 0.5µA. This pin has two
separate thresholds, below 1.5V the output switching is disabled, and below
0.9V the device is forced into a complete micropower shutdown. The 1.5V
threshold functions as an accurate undervoltage lockout (UVLO) with
hysteresis.
The () input to the current limit comparator. A built-in offset of 110mV
between VIN 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 GND with 1µF.
Ground.
High current drive for the synchronous N-channel MOSFET. Voltage swing
is from ground to VIN. On-resistance is typically 3@ 5VIN.
Input voltage to the circuit. Also the high side input to the current sense
amplifier supplies power to the gate drive circuit.
MIC2194
2 April 2005



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MIC2194
Absolute Maximum Ratings (Note 1)
Supply Voltage (VIN) ..................................................... 15V
Digital Supply Voltage (VDD) ........................................... 7V
Enable Pin Voltage (VEN) ............................. 0.3V to +15V
Comp Pin Voltage (VCOMP) ............................ 0.3V to +3V
Feedback Pin Voltage (VFB) .......................... 0.3V to +3V
Current Sense Voltage (VIN VCS) ................. 0.3V to +1V
Power Dissipation (PD) ..................... 285mW @ TA = 85°C
Ambient Storage Temp ............................ 65°C to +150°C
ESD Rating, Note 3 ...................................................... 2kV
Micrel
Operating Ratings (Note 2)
Supply Voltage (VIN) .................................... +2.9V to +14V
Junction Temperature ....................... 40°C TJ +125°C
Package Thermal Resistance
θJA 8-lead SOP ................................................. 140°C/W
Electrical Characteristics
VIN = 5V, VOUT = 3.3V, TJ = 25°C, unless otherwise specified. Bold values indicate 40°C<TJ<+125°C.
Parameter
Condition
Min
Regulation
Feedback Voltage Reference
(1%)
(2%)
1.233
1.22
Feedback Bias Current
Output Voltage Line Regulation
Output Voltage Load Regulation
Output Voltage Total Regulation
Input & VDD Supply
VIN Input Current (IQ)
Shutdown Current (ISD)
Digital Supply Voltage (VDD)
Digital Supply Load Regulation
Undervoltage Lockout
UVLO Hysteresis
5V VIN 9V
0mV < (VIN VCS) < 75mV
5V VIN 9V, 0mV < (VIN VCS) < 75mV (±3%)
(excluding external MOSFET gate current)
VEN = 0V
IL = 0
IL = 0 to 1mA
VDD upper threshold (turn on threshold)
1.208
2.82
Enable/UVLO
Enable Input Threshold
0.6
UVLO Threshold
1.4
Enable Input Current
Current Limit
VEN/UVLO = 5V
Current Limit Threshold Voltage
Error Amplifier
VIN VCS voltage to trip current limit
90
Error Amplifier Gain
Current Amplifier
Current Amplifier Gain
Oscillator Section
wwwO.DscailtlaaStohreeFtr4eUqu.ceonmcy (fO)
Maximum Duty Cycle
Minimum On Time
Frequency Foldback Threshold
VFB = 1.0V
VFB = 1.5V
Measured on FB
360
100
Frequency Foldback Frequency
Typ
1.245
1.245
50
0.15
0.9
1
0.5
3.0
0.1
2.65
100
0.9
1.5
0.2
110
20
3.0
400
165
0.3
90
Max
1.257
1.27
1.282
2
5
3.18
1.2
1.6
5
130
440
Units
V
V
nA
%/V
%
V
mA
µA
V
V
V
mV
V
V
µA
mV
V/V
V/V
kHz
%
ns
V
kHz
April 2005
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MIC2194
Micrel
Parameter
Condition
Min Typ Max Units
Gate Drivers
Rise/Fall Time
Output Driver Impedance
CL = 3300pF
Source, VIN = 12V
Sink, VIN = 12V
Source, VIN = 5V
Sink, VIN = 5V
25 ns
2 6
2 6
3 7
3 7
Note 1.
Note 2.
Note 3.
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, θJA, and the ambient temperature, TA.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive, handling precautions required. Human body model, 1.5kin series with 100pF.
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MIC2194
4
April 2005



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