XCL206B283AR-G Torex Semiconductor Ltd, XCL206B283AR-G Datasheet - Page 13

• Manufacturer Part Number: XCL206B283AR-G
• Description: IC BUCK SYNC 2.8V 0.6A USP-6EL
• Manufacturer: Torex Semiconductor Ltd
• Series: XCL206r
• Type: Point of Load (POL) Non-Isolated with UVLOr

Specifications of XCL206B283AR-G

• Output: 2.8V
• Number Of Outputs: 1
• Power (watts): 1W
• Mounting Type: Surface Mount
• Voltage - Input: 2 ~ 6 V
• Package / Case: USP-6EL
• 1st Output: 2.8 VDC @ 600mA
• Size / Dimension: 0.10" L x 0.08" W x 0.04" H (2.5mm x 2.0mm x 1.04mm)
• Power (watts) - Rated: 1W
• Operating Temperature: -40°C ~ 85°C
• Efficiency: 90%
• Current - Output: 600mA
• Voltage - Output: 2.8V
• Power - Output: 1W
• Internal Switch(s): Yes
• Frequency - Switching: 3MHz
• Synchronous Rectifier: Yes
• For Use With: 893-1159 - BOARD EVAL XCL206B283AR-G 2.8V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 893-1151-2

■OPERATIONAL DESCRIPTION (Continued)
<Short-Circuit Protection>
The short-circuit protection circuit monitors the internal R1 and R2 divider voltage from the V
block diagram shown in the previous page). In case where output is accidentally shorted to the Ground and when the FB
point voltage decreases less than half of the reference voltage (Vref) and a current more than the I
transistor, the short-circuit protection quickly operates to turn off and to latch the driver transistor. In the latch state, the
operation can be resumed by either turning the IC off and on via the CE/MODE pin, or by restoring power supply to the V
pin.
When sharp load transient happens, a voltage drop at the V
circuit protection may operate in the voltage higher than 1/2 V
<UVLO Circuit>
When the V
output caused by unstable operation of the internal circuitry. When the V
operation takes place. By releasing the UVLO function, the IC performs the soft start function to initiate output startup operation.
The soft start function operates even when the V
circuit does not cause a complete shutdown of the IC, but causes pulse output to be suspended; therefore, the internal circuitry
remains in operation.
<PFM Switch Current>
In PFM control operation, until coil current reaches to a specified level (I
on-time (t
t
<PFM Duty Limit>
In the PFM control operation, the PFM Duty Limit (DTY
duty increases (e.g. the condition that the step-down ratio is small), it’s possible for P-ch MOSFET to be turned off even when coil
current doesn’t reach to I
ON
= L
×
I
I
Lx
Lx
PFM
ON
) that the P-ch MOSFET is kept on can be given by the following formula.
IN
/ (V
pin voltage becomes 1.4V or lower, the P-channel output driver transistor is forced OFF to prevent false pulse
I
IN
PFM
t
ON
－
①
V
OUT
PFM
)
.
→I
→I
PFM
PFM
①
I
0mA
②
PFM
IN
pin voltage falls momentarily below the UVLO operating voltage. The UVLO
LIMIT_PFM
I
Lx
Lx
OUT
Maximum IPFM Limit
OUT
) is set to 200% (TYP.). Therefore, under the condition that the
is propagated to the FB point through C
voltage.
f
OSC
I
PFM
PFM
②
), the IC keeps the P-ch MOSFET on. In this case,
IN
pin voltage becomes 1.8V or higher, switching
0mA
I
PFM
OUT
XCL205/XCL206/XCL207
pin (refer to FB point in the
LIM
FB
flows to the driver
, as a result, short
13/27
Series
IN