MIC3289 Datasheet, PDF (4/13 Pages) Micrel Semiconductor – 1.2MHz PWM White LED Driver with Internal Schottky Diode and True 1-Wire Digital Control

Micrel, Inc.
MIC3289
Absolute Maximum Ratings⁽¹⁾
Supply voltage (V_IN) .....................................................7.5V
Switch voltage (V_SW) ..................................... –0.3V to 27V
Digital Control Voltage (V_DC).............................. –0.3 to V_IN
FB Voltage (V_FB) .............................................................6V
Switch Current (I_SW) ........................................................2A
Ambient Storage Temperature (T_S) .........–65°C to +150°C
ESD Rating, Note 3 ..................................................... 2KV
Operating Ratings⁽²⁾
Supply Voltage (V_IN) …………………..…… ..... 2.5V to 6.5V
Output Voltage (V_OUT) …………….… ...V_IN to (V_SW(MAX) - 4V)
or V_IN to VOVP (for options with over voltage
protection)
Junction Temperature Range (T_J) ……......-40°C to +125°C
Package Thermal Impedance
θ_JA 2mm × 2mm MLF^®-8L ..................................93°C/W
θ_JA TSOT23-6 ..................................................235°C/W
Electrical Characteristics⁽⁴⁾
T_A=25^oC, V_IN = 3.6V, V_OUT = 10V, I_OUT = 20mA, unless otherwise noted. Bold values indicate -40°C ≤ T_J ≤ 125°C.
Symbol
V_IN
V_UVLO
I_VIN
I_SD
Parameter
Supply Voltage Range
Under-voltage Lockout
Quiescent Current
Shutdown Current (DC pin
low )
Condition
V_FB >500mV
V_DC = 0V for > 2ms.
Min Typ Max
2.5
6.5
1.8 2.1 2.4
1.4
5
0.01 1
V_FB
I_FB
D_MAX
I_SW
V_DC
Feedback Voltage
Feedback Input Current
Line Regulation
Load Regulation
Maximum Duty Cycle
Switch Current Limit
DC pin thresholds
(+/-5%)
V_FB = 250mV
2.5V ≤ V_IN ≤ 4.5V
5mA ≤ I_OUT ≤ 20mA
V_IN = 3.6V
High
Low
237 250 263
450
0.5
0.5
85 90
500 750 1200
1.1
0.4
DC Pin Hysteresis
20
I_DC
t_shutdown
DC Pin Current
Shutdown Pulse Width
t_{MODE_UP} Count UP mode pulse width
t_{MODE_DO}
WN
t_{start_up}
t_{prog_low}
Count Down mode pulse
width
Turn-on Delay Time
Programming pulse width
low
V_DC = 3.6V
V_IN = 2.8V to 5.5V
V_DC = Low
V_IN = 2.8V to 5.5V
V_DC = Low
V_IN = 2.8V to 5.5V
V_DC = Low
V_IN = 2.8V to 5.5V
V_IN = 2.8V to 5.5V
5
10
1260
100
160
420
500
140
1
32
t_prog__high
Programming pulse width
high
V_IN = 2.8V to 5.5V
1
32
t_delay
T_{prog_setup}
Minimum Delay for mode
change
First Pulse Window for
Preprogramming
V_IN = 2.8V to 5.5V
V_DC = High
V_IN = 2.8V to 5.5V
140
35
50
f_SW Oscillator Frequency
1
1.2 1.35
Units
V
V
mA
µA
mV
nA
%
%
%
mA
V
mV
µA
µs
µs
µs
µs
µs
µs
µs
µs
MHz
March 2007
4
M9999-030407
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