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○ OPERATION NOTES
1.) Absolute maximum ratings
Use of the IC in excess of absolute maximum ratings (such as the input voltage or operating temperature range) may result in damage to the IC.
Assumptions should not be made regarding the state of the IC (e.g., short mode or open mode) when such damage is suffered. If operational
values are expected to exceed the maximum ratings for the device, consider adding protective circuitry (such as fuses) to eliminate the risk of
damaging the IC.
2.) GND potential
The potential of the GND pin must be the minimum potential in the system in all operating conditions. Never connect a potential lower than
GND to any pin, even if only transiently.
3.) Thermal design
Use a thermal design that allows for a sufficient margin for that package power dissipation rating (Pd) under actual operating conditions.
4.) Inter-pin shorts and mounting errors
Use caution when orienting and positioning the IC for mounting on printed circuit boards. Improper mounting or shorts between pins may result
in damage to the IC.
5.) Operation in strong electromagnetic fields
Strong electromagnetic fields may cause the IC to malfunction. Caution should be exercised in applications where strong electromagnetic
fields may be present.
6.) Common impedance
Wiring traces should be as short and wide as possible to minimize common impedance. Bypass capacitors should be use to keep ripple to a
minimum.
7.) Voltage of STBY pin
To enable standby mode for all channels, set the STBY pin to 0.3 V or less, and for normal operation, to 1.2 V or more. Setting STBY to a
voltage between 0.3 V and 1.2 V may cause malfunction and should be avoided. Keep transition time between high and low (or vice versa) to a
minimum.
Additionally, if STBY is shorted to VIN, the IC will switch to standby mode and disable the output discharge circuit, causing a temporary voltage
to remain on the output pin. If the IC is switched on again while this voltage is present, overshoot may occur on the output. Therefore, in
applications where these pins are shorted, the output should always be completely discharged before turning the IC on.
8.) Over-current protection circuit (OCP)
This IC features an integrated over-current and short-protection circuitry on the output to prevent destruction of the IC when the output is
shorted. The OCP circuitry is designed only to protect the IC from irregular conditions (such as motor output shorts) and is not designed to be
used as an active security device for the application. Therefore, applications should not be designed under the assumption that this circuitry
will engage.
9.) Thermal shutdown circuit (TSD)
This IC also features a thermal shutdown circuit that is designed to turn the output off when the junction temperature of the IC exceeds. This
feature is intended to protect the IC only in the event of thermal overload and is not designed to guarantee operation or act as an active
security device for the application. Therefore, applications should not be designed under the assumption that this circuitry will engage.
10.) Input/output capacitor
Cout=0.47μF, Cin=0.47μF, Temp=+25℃
Capacitors must be connected between the input/output pins and GND for stable operation,
and should be physically mounted as close to the IC pins as possible (refer to figure 4). The
100
input capacitor helps to counteract increases in power supply impedance, and increases
Unstable region
stability in applications with long or winding power supply traces. The output capacitance
10
value is directly related to the overall stability and transient response of the regulator, and
should be set to the largest possible value for the application to increase these
1
characteristics. During design, keep in mind that in general, ceramic capacitors have a wide
Stable region
range of tolerances, temperature coefficients and DC bias characteristics, and that their
capacitance values tend to decrease over time. Confirm these details before choosing
appropriate capacitors for your application..
0.1
(Please refer the technical note, regarding ceramic capacitor of recommendation.)
0.01
0
50
100
150
200
IOUT [mA]
IOUT [mA]
Fig.4 Stable region (example)
REV. B
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