LM25069PMME-1/NOPB National Semiconductor, LM25069PMME-1/NOPB Datasheet - Page 17

• Manufacturer Part Number: LM25069PMME-1/NOPB
• Description: IC CTLR POS HOTSWAP LATCH 10MSOP
• Manufacturer: National Semiconductor
• Type: Hot-Swap Controllerr

Specifications of LM25069PMME-1/NOPB

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: 2.9 V ~ 17 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
• Input Voltage: 17V
• Output Voltage: 19.5V
• Internal Switch: No
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM25069PMME-1TR

The four resistor values are calculated as follows:
(V
(V
Option D: The OVLO function can be disabled by grounding
the OVLO pin. The UVLO thresholds are set as described in
Option B or Option C.
- Choose the upper and lower UVLO thresholds (V
UVL
-Choose the upper and lower OVLO threshold (V
OVL
FIGURE 12. Programming the Four Thresholds
).
).
FIGURE 13. UVLO = POR with Shutdown/Restart Control
OVH
UVH
) and
30086741
) and
17
As an example, assume the application requires the following
thresholds: V
14V. Therefore V
sistor values are:
R1 = 50 kΩ, R2 = 10 kΩ
R3 = 75 kΩ, R4 = 6.07 kΩ
Where the R1-R4 resistor values are known, the threshold
voltages and hysteresis are calculated from the following:
Option C: The minimum UVLO level is obtained by connect-
ing the UVLO pin to VIN as shown in
on when the VIN voltage reaches the POR threshold (
The OVLO thresholds are set using R3, R4. Their values are
calculated using the procedure in Option B.
POWER GOOD PIN
During turn-on, the Power Good pin (PGD) is high until the
voltage at VIN increases above
low, remaining low as the VIN voltage increases. When the
voltage at OUT increases to within 1.3V of the SENSE pin
(V
DS
<1.3V), PGD switches high. PGD switches low if the
UVH
= 8V, V
UV(HYS)
V
V
UV(HYS)
OV(HYS)
UVL
= 1V, and V
= R1 x 20 µA
= R3 x 20 µA
= 7V, V
30086750
≊
1.6V. PGD then switches
Figure
OVH
OV(HYS)
= 15.5V, and V
13. Q1 is switched
= 1.5V. The re-
www.national.com
≊
2.6V).
OVL
=