LM2825N-5.0/NOPB National Semiconductor, LM2825N-5.0/NOPB Datasheet - Page 7

• Manufacturer Part Number: LM2825N-5.0/NOPB
• Description: IC CONVERTER DC/DC 1A 24-DIP
• Manufacturer: National Semiconductor
• Type: Step-Down (Buck)r

Specifications of LM2825N-5.0/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 1A
• Frequency - Switching: 150kHz
• Voltage - Input: 7 ~ 40 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 24-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: *LM2825N-5.0; *LM2825N-5.0/NOPB; LM2825N-5.0

Test Circuit
*
*
V
V
*
*
***
V
V
I
Application Information
PROGRAMMING OUTPUT VOLTAGE
(Selecting R1 and R2 as shown in Figure 3 )
The LM2825 is available in two adjustable output versions.
The LM2825-ADJ has been optimized for output voltages
between 1.23V and 8V, while the LM2825H-ADJ covers the
output voltage range of 7V to 15V. Both adjustable versions
are set in the following way.
Select a value for R1 between 240
resistor values minimize noise pickup at the sensitive adjust
pin. (For lowest temperature coefficient and the best stability
with time, use 1% metal film resistors.)
LOAD
Optional—Required if package is more than 6" away from main filter or bypass capacitor.
*Optional Soft-start Capacitor
Optional—Required if package is more than 6" away from main filter or bypass capacitor.
*Optional Soft-start Capacitor
IN
OUT
IN
OUT
Optional—See Application Information.
= 40V (max)
= 40V (max)
= 3.3V or 5V
= 1.23V to 8V (LM2825-ADJ)
= I
7V to 15V (LM2825H-ADJ)
MAX
(See derating curves)
@
1A or 12V
@
0.75A
and 1.5 k . The lower
(Adjustable Output Voltage Versions)
FIGURE 2. Standard Test Circuit
FIGURE 3. Standard Test Circuit
(Fixed Output Voltage Versions)
7
Select R2 with the following equation.
When programming V
greater than V
OPTIONAL EXTERNAL COMPONENTS
SOFT-START CAPACITOR
C
Soft-start feature (slow start-up). The current drawn from the
source starts out at a low average level with narrow pulses,
and ramps up in a controlled manner as the pulses expand
to their steady-state width. This reduces the startup current
considerably, and delays and slows down the output voltage
rise time.
SS
: A capacitor on this pin provides the regulator with a
OUT
+ 2V for proper operation.
OUT
, keep in mind that V
DS012661-19
DS012661-30
www.national.com
IN
must be