MIC3291 Datasheet, PDF (3/17 Pages) Micrel Semiconductor – 1.2MHz PWM White LED Driver with Internal Schottky Diode and Single-Wire Linear Brightness Control

Micrel, Inc.
MIC3291
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⁽²⁾................................................................2KV
Operating Ratings⁽³⁾
Supply Voltage (V_IN) …………………..…… ......2.5V to 6.5V
Output Voltage (V_OUT) …………….… ............... (V_IN to V_OVP)
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
Parameter
Condition
Min. Typ. Max.
V_IN
V_UVLO
I_VIN
Supply Voltage Range
Under-Voltage Lockout
Quiescent Current
V_FB >500mV
2.5
6.5
1.8 2.1 2.4
2
4
I_SD
Shutdown Current (DC Pin Low ) V_DC = 0V for > 2ms.
0.01 1
V_FB
Feedback Voltage
(±5%)
237 250 263
Feedback Input Current
V_FB = 250mV
450
I_FB
Line Regulation
2.5V ≤ V_IN ≤ 4.5V
0.5
D_MAX
I_SW
V_DC
Load Regulation
Maximum Duty Cycle
Switch Current Limit
DC Pin Thresholds
5mA ≤ I_OUT ≤ 20mA
V_IN = 3.6V
High
Low
0.5
86
90
500 750 1200
1.1
0.4
I_DC
DC Pin Current
V_DC = 3.6V
5
10
t_shutdown
t_{MODE_UP}
t_{MODE_DOWN}
t_{start_up}
t_{prog_low}
t_prog__high
t_delay
T_{prog_setup}
Shutdown Pulse Width
Count UP Mode Pulse Width
Count Down Mode Pulse Width
Turn-On Delay Time
Programming Pulse Width Low
Programming Pulse Width High
Minimum Delay for Mode Change
First Pulse Window for
Preprogramming
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
V_IN = 2.8V to 5.5V
V_IN = 2.8V to 5.5V
V_DC = High
V_IN = 2.8V to 5.5V
1260
100
160
420
500
140
1
32
1
32
140
35
50
f_SW
Oscillator Frequency
1
1.2 1.35
Units
V
V
mA
μA
mV
nA
%
%
mA
V
μA
µs
µs
µs
µs
µs
µs
µs
µs
MHz
September 2010
3
M9999-092810
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