MIC3230 Datasheet, PDF (4/20 Pages) Micrel Semiconductor – Constant Current Boost Controller for Driving High Power LEDs

Micrel, Inc.
MIC3230/1/2
Absolute Maximum Ratings⁽¹⁾
Supply Voltage (V_IN) .....................................................+48V
Enable Pin Voltage........................................... -0.3V to +6V
IADJ Voltage ..................................................................+6V
Lead Temperature (soldering, #sec.)......................... 260°C
Storage Temperature (Ts)..........................-65°C to +150°C
ESD Rating⁽³⁾..................... MIC3230= 1500V HB, 100VMM
.........................................MIC3232= 2kV HB, 100VMM
.................................... MIC3231= 1500V HB, 150VMM
Electrical Characteristics⁽⁴⁾
Operating Ratings⁽²⁾
Supply Voltage (V_IN)......................................... +6V to +45V
Junction Temperature (TJ)........................ –40°C to +125°C
Junction Thermal Resistance
MSOP-10 (θ_JA) ..............................................130.5°C/W
EPAD TSSOP-16 (θ_JA) ...................................36.5°C/W
3mmx3mm MLF^®-12L (θ_JA).............................60.7°C/W
V_IN = 12V; V_EN = 3.6V; L = 47µH; C = 4.7µF; T_J = 25°C, Bold values indicate –40°C≤ T_J ≤ +125°C, unless noted.
Symbol Parameter
Condition
Min Typ Max
V_IN
UVLO
Supply Voltage Range
Under Voltage Lockout
6
45
3.5 4.9 5.5
I_VIN
Quiescent Current
V_FB > 275mV (to ensure device is not
switching)
3.2 10
I_SD
V_IADJ
I_ADJ
D_MAX
Shutdown Current
Feedback Voltage (at IADJ)
Feedback Input Current
Line Regulation
Load Regulation
Maximum Duty Cycle
V_EN = 0V
Room temperature (3%)
–40°C≤ T_J ≤ +125°C (5%)
V_FB = 250mV
V_IN = 12V to 24V
V_OUT to 2 × V_OUT
MIC3230 & MIC3232
MIC3231
30
242.5 250
237.5 250
1.2
2
2
90
88
257.5
262.5
3
V_EN
Enable Threshold
Turn ON
Turn OFF
1.5 1.15
1.1 0.4
I_EN
Enable Pin Current
VEN = 3.3V
REN = 100kΩ
17
30
V_PWM
PWMD Threshold
Turn ON
Turn OFF
1.5 0.75
0.7 0.4
f_PWMD
f_SW
f_SW
F_DITHER
V_SENS
PWMD Frequency Range
Programmable Oscillator
Frequency
Fixed Frequency Option
Low EMI (MIC3231)
Current Limit Threshold
Voltage
Note 5 (L = 47µH; C = 4.7µF)
R_FREQ = 82.5kΩ
R_FREQ = 21kΩ
R_FREQ = 8.25kΩ
(MIC3232YMM)
Frequency dither shift from nominal
R_SENSE = 390Ω
0
109
360 400
950
360 400
±12
0.315 0.45
500
440
440
0.585
I_SENSE
V_OVP
I_SENSE peak current out
Over Voltage Protection
Driver Impedance
R_SENSE = 390Ω
SINK
SOURCE
250
1.203 1.24
2.4
2
1.277
3.5
Units
V
V
mA
µA
mV
mV
µA
%
%
%
%
V
V
µA
V
V
Hz
kHz
kHz
kHz
kHz
%
V
µA
V
Ω
Ω
January 2009
4
M9999-011409-A