MIC2860-2DYD6 TR Micrel Inc, MIC2860-2DYD6 TR Datasheet - Page 9

• Manufacturer Part Number: MIC2860-2DYD6 TR
• Description: IC WHITE LED DRIVER 2CH SOT-23-6
• Manufacturer: Micrel Inc
• Series: -r

Specifications of MIC2860-2DYD6 TR

• Constant Current: -
• Constant Voltage: -
• Topology: Linear (LDO)
• Number Of Outputs: 2
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: -
• Voltage - Supply: 3 V ~ 5.5 V
• Voltage - Output: 0 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 576-3939-2

33µs (t
maximum brightness level 1. After start up, the internal
control logic is ready to decrease the WLED brightness
upon receiving programming pulses (positive edges
applied to SC pin). The brightness level can be
decreased one level by applying a single programming
pulse as shown in Figure 5. Brightness settings can be
quickly changed by sending programming pulses one
after each other. Each programming pulse has a high
(t
be between 0.3µs to 75µs.
Multiple brightness levels can be changed as shown in
Figure 6. When issuing multiple brightness level
adjustments to the SC pin, ensure both t
t
To maintain operation at the current brightness level
simply maintain a logic level high at the SC pin.
The MIC2860-2D can be programmed to set WLED
drive current to produce one of 32 distinct brightness
levels. The following section explains how the brightness
counter functions with continued programming edges.
PROG_HIGH
Micrel Inc.
July 2010
PROG_HIGH
Figure 6. Consecutive Brightness Level Commands
START_UP
Figure 5. Brightness Programming Pulses
are within 0.3µs and 75µs.
) and a low (t
) after the SC pin is first pulled high at the
PROG_LOW
) pulse width that must
PROG_LOW
and
9
Counter Roll-Over
The MIC2860-2D internal counter contains registers
from 0 to 31 (32 levels). When the brightness level is at
32 (minimum brightness) and a programming pulse
forces the brightness to step down, the counter will roll-
over to level 31 (maximum brightness). This is illustrated
in Figure 7.
Input Capacitor
The MIC2860-2D is a high performance, high bandwidth
device. Stability can be maintained using a ceramic input
capacitor of 1µF. Low ESR ceramic capacitors provide
optimal performance at a minimum amount of space.
Additional high-frequency capacitors, such as small
valued NPO dielectric type capacitors, help filter out high
frequency noise and are good practice in any noise
sensitive
recommended for the input capacitor. Y5V dielectrics
lose most of their capacitance over temperature and are
therefore not recommended.
circuit.
Figure 7. Down Counter Roll-Over
X5R
or
X7R
M9999-072010-A
dielectrics
MIC2860-2D
are