lm26484sqx National Semiconductor Corporation, lm26484sqx Datasheet - Page 16

• Manufacturer Part Number: lm26484sqx
• Description: Power Management Unit
• Manufacturer: National Semiconductor Corporation

www.national.com
A simplified “worst case” assumption is that all of the PFET
current is supplied by the input capacitor. This will result in
conservative estimates of input ripple voltage and capacitor
RMS current. Input ripple voltage is estimated as follows:
10 µF for CIN or COUT; C9, C2, C1, C5, C7, C10
22 µF for COUT; C10, C2, C7
GRM31CR70J226KE23L
JMK316B7226ML-T
GRM21BR60J106K
LMK212C106KG-T
C1608X5R0J106K
Capacitor
JMK212BJ106K
C10,
C2,
C7,
Model
Model
Min Value
10.0
10.0
10.0
Ceramic, X7R
Ceramic, X5R
Ceramic, X7R
Ceramic, X5R
Ceramic, X7R
Ceramic, X7R
Unit
µF
µF
µF
Type
Type
LDO1 output capacitor
SW1 output capacitor
SW2 output capacitor
16
Description
Taiyo-Yuden
Taiyo-Yuden
Taiyo-Yuden
V
I
C
ESR
This capacitor is exposed to significant RMS current, so it is
important to select a capacitor with an adequate RMS current
rating. Capacitor RMS current estimated as follows:
I
OUT
RSCIN
PPIN
IN:
Vendor
Vendor
Murata
Murata
TDK
:
IN:
:
Estimated input capacitor RMS current
Estimated peak-to-peak input ripple voltage
Output current, Amps
Input capacitor value, Farads
Input capacitor ESR, Ohms
Voltage Rating
Voltage Rating
6.3V
6.3V
6.3V
6.3V
6.3V
10V
Recommended Type
Ceramic, 6.3V, X5R
Ceramic, 6.3V, X5R
Ceramic, 6.3V, X5R
Case Size Inch
Case Size Inch
0805, (2012)
0805, (2012)
0805, (2012)
0603, (1608)
1206, (3216)
1206, (3216)
(mm)
(mm)