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
V
IN
5V
47µF
16V
4.7µH
MIC2196BM
VIN OUTN
EN/
CS
UVLO
GND
VDD
10k
10nF
COMP
FB
Si4884
(x2)
B530
10k
1.15k
VOUT
12V, 3A
100
95
90
EFFICIENCY (%)
85
80
75
70
65
60
55
V
IN
= 5V
50
0 0.5 1 1.5 2 2.5 3 3.5 4
OUTPUT CURRENT (A)
MIC2196
5V to 12V Efficiency
120µF
20V
(x3)
1µF
Adjustable Output 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
September 2008
M9999-092908
Micrel, Inc.
MIC2196
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
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
Pin Name
COMP
FB
EN/UVLO
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.
R
ON
is typically 3Ω @ 5V
IN
.
Input voltage to the control IC. This pin also supplies power to the gate drive circuit.
4
CS
5
6
7
8
VDD
GND
OUTN
VIN
September 2008
2
M9999-092908
Micrel, Inc.
MIC2196
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .......................................................15V
Digital Supply Voltage (V
DD
).............................................7V
Comp Pin Voltage (V
COMP
) .............................. –0.3V to +3V
Feedback Pin Voltage (V
FB
) ............................ –0.3V to +3V
Enable Pin Voltage (V
EN/UVLO
) ....................... –0.3V to +15V
Current Sense Voltage (V
CS
)........................... –0.3V to +1V
Power Dissipation (P
D
) ....................... 285mW @ T
A
= 85°C
Ambient Storage Temperature (T
s
) ...........–65°C to +150°C
ESD Rating
(3)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
)...................................... +2.9V to +14V
Junction Temperature .........................–40°C
≤
T
J
≤
+125°C
Package Thermal Resistance
SOIC-8 (θ
JA
).....................................................140°C/W
Electrical Characteristics
V
IN
= 5V; V
OUT
= 12V; T
A
= 25°C.
Bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Regulation
Feedback Voltage Reference
Feedback Bias Current
Output Voltage Line Regulation
Output Voltage Load Regulation
Output Voltage Total Regulation
Input & V
DD
Supply
V
IN
Input Current (I
Q
)
Shutdown Quiescent Current
Digital Supply Voltage (V
DD
)
Digital Supply Load Regulation
Undervoltage Lockout
UVLO Hysteresis
Enable/UVLO
Enable Input Threshold
UVLO Threshold
Enable Input Current
Current Limit
Current Limit Threshold Voltage
Error Amplifier
Error Amplifier Gain
Current Amplifier
Current Amplifier Gain
Oscillator Section
Oscillator Frequency (f
O
)
Maximum Duty Cycle
Minimum On Time
Frequency Foldback Threshold
Frequency Foldback Frequency
V
FB
= 1.0V
V
FB
= 1.5V
Measured on FB
360
400
85
165
0.3
90
440
kHz
%
ns
V
kHz
3.7
V/V
20
V/V
(Voltage on CS to trip current limit)
90
110
130
mV
V
EN/UVLO
= 5V
0.6
1.4
0.9
1.5
0.2
1.2
1.6
5
V
V
µA
(excluding external MOSFET gate current)
V
EN/UVLO
= 0V
I
L
= 0
I
L
= 0 to 5mA
V
DD
upper threshold (turn on threshold)
2.82
1
0.5
3.0
0.1
2.65
100
2
5
3.18
mA
µA
V
V
V
mV
3V
≤
V
IN
≤
9V
0mV
≤
V
CS
≤
75mV
3V
≤
V
IN
≤
9V; 0mV
≤
V
CS
≤
75mV (±3%)
1.208
(±1%)
(±2%)
1.233
1.220
1.245
1.245
50
+0.08
-1.2
1.282
1.258
1.270
V
V
nA
%/V
%
V
Condition
Min
Typ
Max
Units
September 2008
3
M9999-092908
Micrel, Inc.
Parameter
Gate Drivers
Rise/Fall Time
Output Driver Impedance
C
L
= 3300pF
Source, V
IN
= 12V
Sink, V
IN
= 12V
Source, V
IN
= 5V
Sink, V
IN
= 5V
Notes:
MIC2196
Condition
Min
Typ
25
2
2
3
3
6
6
7
7
Max
Units
ns
Ω
Ω
Ω
Ω
1. 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, T
J(Max)
, the
junction-to-ambient thermal resistance,
θ
JA
, and the ambient temperature, T
A
.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
September 2008
4
M9999-092908
Micrel, Inc.
MIC2196
Typical Characteristics
5.0
QUIESCENT CURRENT (mA)
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
2
Standby
4 6 8 10 12 14
INPUT VOLTAGE (V)
Quiescent Current
vs. Supply Voltage
Switching
QUIESCENT CURRENT (mA)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
Quiescent Current
vs. Temprerature
V
IN
= 5V
3.05
3.00
VDD (V)
2.95
2.90
2.85
2.80
0
VDD vs.
Input Voltage
0.2
0
-60 -40 -20 0 20 40 60 80 100120
TEMPERATURE (°C)
2
4 6 8 10 12 14 16
INPUT VOLTAGE (V)
VDD
vs. Load
3.02
3.01
3.00
2.99
2.98
2.97
2.96
2.95
2.94
2.93
2.92
0
VDD vs.
Temperature
3.5
V
IN
= 5V
3.4
3.3
3.2
3.1
3
2.9
2.8
2.7
2.6
2.5
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
1.246
REFERENCE VOLTAGE (V)
1.245
1.244
1.243
1.242
1.241
1.24
1.239
1.238
0
Reference Voltage
vs. Input Voltage
V
IN
= 5V
VDD (V)
VDD (V)
V
IN
= 12V
V
IN
= 3.3V
0.2 0.4 0.6 0.8 1.0
LOAD CURRENT (mA)
1.2
2 4 6 8 10 12 14 16
INPUT VOLTAGE (VINA)
Reference Voltage
vs. Temperature
1.30
REFERENCE VOLTAGE (V)
1.29
1.28
1.27
1.26
1.25
1.24
1.23
1.22
1.21
1.20
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
FREQUENCY VARIATION (%)
V
IN
= 5V
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
0
Switching Frequency
vs. Input Voltage
450
440
FREQUENCY (kHz)
430
420
410
400
390
380
370
360
2
4 6 8 10 12 14
INPUT VOLTAGE (V)
Frequency
vs. Temperature
V
IN
= 5V
350
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
130.0
125.0
THRESHOLD (mV)
120.0
115.0
110.0
105.0
100.0
95.0
90.0
0
2
4 6 8 10 12 14
INPUT VOLTAGE (V)
CURRENT LIMIT THRESHOLD (mV)
Overcurrent Threshold
vs. Input Voltage
Current Limit
vs. Temperature
120
115
110
105
100
95
90
85
80
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
ENABLE PIN CURRENT (µA)
Enable Pin
vs. Input Voltage
200
150
100
50
0
-50
0
2
4 6 8 10 12 14
INPUT VOLTAGE (V)
V
IN
= 5V
September 2008
5
M9999-092908
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