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Control IC. MIC2196 Datasheet |
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MIC2196
400kHz SO-8 Boost Control IC
General Description
Micrel’s MIC2196 is a high efficiency PWM boost control
IC housed in a SO-8 package. The MIC2196 is optimized
for low input voltage applications. With its wide input
voltage range of 2.9V to 14V, the MIC2196 can be used to
efficiently boost voltages in 3.3V, 5V, and 12V systems, as
well as 1- or 2-cell Li Ion battery powered applications. Its
powerful 2Ω output driver allows the MIC2196 to drive
large external MOSFETs.
The MIC2196 is ideal for space-sensitive applications. 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 MIC2196 can implement
all ceramic capacitor solutions.
Efficiencies over 90% are achievable over a wide range of
load conditions with the MIC2196’s PWM boost control
scheme. Its fixed frequency PWM architecture also makes
the MIC2196 is ideal for noise-sensitive
telecommunications applications.
MIC2196 features a low current shutdown mode of 1μA
and programmable undervoltage lockout.
The MIC2196 is available in an 8-pin SOIC package with a
junction temperature range from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• 2.9V to 14V input voltage range
• >90% efficiency
• 2Ω output driver
• 400kHz oscillator frequency
• PWM current mode control
• 0.5μA micro power shutdown
• Programmable UVLO
• Front edge blanking
• Cycle-by-cycle current limiting
• Frequency foldback short-circuit protection
• 8-pin SOIC package
Applications
• Step-up conversion in telecom/datacom systems
• SLIC power supplies
• SEPIC power supplies
• Low input voltage flyback and forward converters
• Wireless modems
• Cable modems
• ADSL line cards
• Base stations
• 1-and 2-cell Li Ion battery operated equipment
_________________________________________________________________________________________________________
Typical Application
VIN
5V
47µF
16V
1µF
10nF
4.7µH
Si4884
(x2)
MIC2196BM
VIN OUTN
EN/ CS
UVLO
VDD GND
10k COMP FB
B530
10k
1.15k
VOUT
12V, 3A
120µF
20V
(x3)
Adjustable Output Boost Converter
100
95
90
85
80
75
70
65
60
55
500
MIC2196
5V to 12V Efficiency
VIN = 5V
0.5 1 1.5 2 2.5 3 3.5
OUTPUT CURRENT (A)
4
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2008
M9999-092908
|
Micrel, Inc.
Ordering Information
Part Number
MIC2196BM
MIC2196YM
Voltage
Adj.
Adj.
Frequency
400kHz
400kHz
Temperature Range
–40°C to +125°C
–40°C to +125°C
Package
8-Pin SOIC
8-Pin SOIC
MIC2196
Lead Finish
Standard
Pb-Free
Pin Configuration
COMP 1
FB 2
EN/UVLO 3
CS 4
8 VIN
7 OUTN
6 GND
5 VDD
8-Pin SOIC (M)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
COMP
FB
EN/UVLO
CS
VDD
GND
OUTN
VIN
Pin Function
Compensation (Output): Internal error amplifier output. Connect to a capacitor or
series RC network to compensate the regulator’s control loop.
Feedback (Input): Regulates FB 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 100mV hysteresis.
The (+) input to the current limit comparator. A built in offset of 100mV between CS
and GND 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 N-Channel MOSFET. Voltage swing is from ground to VIN.
RON is typically 3Ω @ 5VIN.
Input voltage to the control IC. This pin also supplies power to the gate drive circuit.
September 2008
2 M9999-092908
|
Micrel, Inc.
MIC2196
Absolute Maximum Ratings(1)
Supply Voltage (VIN) .......................................................15V
Digital Supply Voltage (VDD).............................................7V
Comp Pin Voltage (VCOMP) .............................. –0.3V to +3V
Feedback Pin Voltage (VFB) ............................ –0.3V to +3V
Enable Pin Voltage (VEN/UVLO) ....................... –0.3V to +15V
Current Sense Voltage (VCS)........................... –0.3V to +1V
Power Dissipation (PD) ....................... 285mW @ TA = 85°C
EASmDbieRnattiSntgo(3ra)..g..e...T..e..m...p..e..r.a..t.u..r.e...(.T...s.)........................–..6..5..°.C....t.o...+..1..5. 20k°CV
Operating Ratings(2)
Supply Voltage (VIN)...................................... +2.9V to +14V
Junction Temperature .........................–40°C ≤ TJ ≤ +125°C
Package Thermal Resistance
SOIC-8 (θJA).....................................................140°C/W
Electrical Characteristics
VIN = 5V; VOUT = 12V; TA = 25°C. Bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted.
Parameter
Condition
Min
Regulation
Feedback Voltage Reference
Feedback Bias Current
(±1%)
(±2%)
1.233
1.220
Output Voltage Line Regulation
Output Voltage Load Regulation
Output Voltage Total Regulation
3V ≤ VIN ≤ 9V
0mV ≤ VCS ≤ 75mV
3V ≤ VIN ≤ 9V; 0mV ≤ VCS ≤ 75mV (±3%)
1.208
Input & VDD Supply
VIN Input Current (IQ)
Shutdown Quiescent Current
Digital Supply Voltage (VDD)
Digital Supply Load Regulation
Undervoltage Lockout
UVLO Hysteresis
(excluding external MOSFET gate current)
VEN/UVLO = 0V
IL = 0
IL = 0 to 5mA
VDD upper threshold (turn on threshold)
2.82
Enable/UVLO
Enable Input Threshold
0.6
UVLO Threshold
1.4
Enable Input Current
VEN/UVLO = 5V
Current Limit
Current Limit Threshold Voltage
(Voltage on CS to trip current limit)
90
Error Amplifier
Error Amplifier Gain
Current Amplifier
Current Amplifier Gain
Oscillator Section
Oscillator Frequency (fO)
Maximum Duty Cycle
Minimum On Time
Frequency Foldback Threshold
VFB = 1.0V
VFB = 1.5V
Measured on FB
360
Frequency Foldback Frequency
Typ Max Units
1.245
1.245
50
+0.08
-1.2
1.258
1.270
1.282
V
V
nA
%/V
%
V
1 2 mA
0.5 5 µA
3.0 3.18
V
0.1 V
2.65 V
100 mV
0.9 1.2
V
1.5 1.6
V
0.2 5 µA
110 130 mV
20 V/V
3.7 V/V
400 440 kHz
85 %
165 ns
0.3 V
90 kHz
September 2008
3 M9999-092908
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