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SGM3141B Datasheet(PDF) 9 Page - SG Micro Corp

Part # SGM3141B
Description  Charge Pump LED Driver
Download  14 Pages
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Manufacturer  SGMICRO [SG Micro Corp]
Direct Link  http://www.sg-micro.com
Logo SGMICRO - SG Micro Corp

SGM3141B Datasheet(HTML) 9 Page - SG Micro Corp

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700mA Buck/Boost
Charge Pump LED Driver
9
SGM3141B
SG Micro Corp
www.sg-micro.com
APPLICATION INFORMATION
Over-Temperature Protection
When the temperature of SGM3141B rises above 145
℃,
the over-temperature protection circuitry turns off the
output switches to prevent damage to the device. If the
temperature drops back down below 130
℃, the part
automatically recovers and executes a soft-start cycle.
Over-Voltage Protection
The SGM3141B has over-voltage protection. If the output
voltage rises above the 5.5V threshold, the over-voltage
protection shuts off all of the output switches to prevent
the output voltage from rising further. When the output
decreases below 5.2V, the device resumes normal
operation.
Over-Current Protection
The over-current protection circuitry monitors the
average current out of the VOUT = 47mV (Torch Mode) pin.
If the average output current exceeds approximately 1A,
then the over-current protection circuitry shuts off the
output switches to protect the chip.
Component Selection
The SGM3141B charge pump circuit requires 3
capacitors: 4.7μF input, 1μF output and 1μF flying
capacitors are typically recommended. For the input
capacitor, a larger value of 10μF will help reduce input
voltage ripple for applications sensitive to ripple on the
battery voltage. All the capacitors should be surface
mount ceramic for low lead inductance necessary at the
2.2MHz switching frequency of the SGM3141B and to
obtain low ESR, which improves bypassing on the input
and output and improves output voltage drive by reducing
output resistance. Ceramic capacitors with X5R or X7R
temperature
grade
are
recommended
for
most
applications.
The input and output capacitors should be located as
close to the VIN and VOUT pins as possible to obtain
best bypassing, and the returns should be connected
directly to the PGND pin or to the thermal pad ground
located under the SGM3141B. The flying capacitor
should be located as close to the C1 and C2 pins as
possible.
To obtain lower output ripple, the COUT value can be
increased from 1μF to 2.2μF or 4.7μF with a
corresponding decrease in output ripple. For output
currents of 500mA to 700mA, the recommended CF flying
capacitor value of 1μF should be used. Output currents in
Flash of 100mA to 400mA can use a 0.47μF CF but a
minimum 1μF COUT is still needed.
Resistor Selection
The sense resistor RSENSE is determined by the value
needed in the Torch mode for the desired output current
by the equation:
RSENSE = VFB/IOUT where VFB = 47mV (Torch Mode)
Once the RSENSE resistor has been selected for Torch
mode, the VFB voltage can be selected for Flash mode
using the following equation:
VFB = IOUT × RSENSE (Flash Mode) where IOUT is for Flash
Mode.
Next, the RSET resistor can be selected for Flash mode
using the following equation:
RSET = (1.26V/VFB) × 10.2kΩ (Flash Mode)
For an example of 190mA Torch mode and 600mA Flash
mode, the values of RSENSE = 0.25Ω, VFB = 150mV (Flash
Mode), and RSET = 86.6kΩ are calculated. The power
obtained in the Flash mode would be:
PFLASH = VFB × IOUT = 150mV × 600mA = 90mW
The typical 0603 surface mount resistor is rated 1/10
Watt continuous power and 1/5 Watt pulsed power, more
than enough for this application. For other applications,
the PFLASH power can be calculated and resistor size
selected. The RSENSE resistor is recommended to be size
0603 for most applications.
The range of typical resistor values and sizes are shown
here in Table 1.


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