LM2833ZMY/NOPB National Semiconductor, LM2833ZMY/NOPB Datasheet - Page 12

• Manufacturer Part Number: LM2833ZMY/NOPB
• Description: IC REG BUCK 3.0MHZ 3A 10MSOP
• Manufacturer: National Semiconductor
• Type: Step-Down (Buck)r

Specifications of LM2833ZMY/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 4.5 V
• Current - Output: 3A
• Frequency - Switching: 3MHz
• Voltage - Input: 3 ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP Exposed Pad, 10-HMSOP, 10-eMSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: LM2833ZMYTR

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FIGURE 7. Loop Gain and Phase without C
FIGURE 8. Loop Gain and Phase with C
FIGURE 6. Adding a C
FF
Capacitor
30013255
30013237
30013238
FF
FF
12
OUTPUT OVER-VOLTAGE PROTECTION
The LM2833 has a built in output over-voltage comparator
that compares the FB pin voltage to a threshold voltage that
is 15% higher than the internal reference V
pin voltage exceeds this threshold level (typically 0.69V), the
internal PMOS power switch is turned off, which allows the
output voltage to decrease towards regulation.
UNDER-VOLTAGE LOCKOUT
Under-voltage lockout (UVLO) prevents the LM2833 from op-
erating until the input voltage exceeds 2.70V (typical). The
UVLO threshold has approximately 350mV of hysteresis, so
the part will operate until V
Hysteresis prevents the part from turning off during power up
if V
CURRENT LIMIT
The LM2833 uses cycle-by-cycle current limiting to protect
the internal power switch. During each switching cycle, a cur-
rent limit comparator detects if the power switch current ex-
ceeds 4.4A (typical), and turns off the switch until the next
switching cycle begins.
IN
is non-monotonic.
FIGURE 9. Load Step Response without C
FIGURE 10. Load Step Response with C
IN
drops below 2.35V (typical).
REF
. Once the FB
30013245
30013246
FF
FF