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LM26484 Scheda tecnica(PDF) 11 Page - Texas Instruments

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Il numero della parte LM26484
Spiegazioni elettronici  LM26484 Power Management Unit
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AVIN
nPOR
170 ms
LM26484
www.ti.com
SNVS573F – SEPTEMBER 2008 – REVISED MARCH 2013
FLEXIBLE POWER SEQUENCING OF MULTIPLE POWER SUPPLIES
The two bucks and the LDO in the LM26484 can be individually controlled with ENSW1, ENSW2, and ENLDO,
respectively. All the enable inputs need to be either grounded or tied to VIH.
Power-On Reset
The LM26484 provides an active low reset output nPOR. Typical waveform is as shown in Figure 17 below:
Figure 17. Power-On Reset Waveform
LDO Functional Description
The LDO is a linear regulator which targets analog loads characterized by low noise requirements. The LDO is
enabled through the ENLDO pin. The output voltage is determined by the configuration of the external feedback
resistors, as seen in Typical Application Circuit, R5 and R6.
NO-LOAD STABILITY
The LDO will remain stable and in regulation with no external load. This is an important consideration in some
circuits, for example CMOS RAM keep-alive applications.
Table 2. LDO Configuration and Component Selection Guide
Feedback
Target
Ideal Resistor Values
Common R Values
Actual VOUT with
Capacitor
Com R (V)
VOUT(V)
R5 (K
Ω)
R6 (K
Ω)
R5 (K
Ω)
R6 (K
Ω)
C11 (pF)
0.8
120
200
120
200
0.8
15
0.9
160
200
162
200
0.905
15
1
200
200
200
200
1
15
1.1
240
200
240
200
1.1
15
1.2
280
200
280
200
1.2
12
1.3
320
200
324
200
1.31
12
1.4
360
200
357
200
1.393
10
1.5
400
200
402
200
1.505
10
RESISTOR SELECTION FOR LDO
The output voltage of the LDO on the LM26484 is established by the feed back resistor divider R5 and R6 shown
on the typical application circuit (page 1). The equation for determining VOUT is: VOUT = VFB*(R5+R6)/R6, where
VFB is the voltage on the LDO_FB pin.
The LDO control loop will force the voltage on VFB to be 0.50V.
Table 2 shows ideal resistor values to establish LDO voltages from 0.8V to 1.5V along with common resistor
values to establish these voltages. Common resistors do not always produce the target value. The resulting
output voltage using common resistors is also found in Table 2. To keep the power consumed by the feedback
network low it is recommended that R6 be established as about 200 k
Ω. Lesser values of R6 are OK and can be
used at the user’s discretion.
Copyright © 2008–2013, Texas Instruments Incorporated
Submit Documentation Feedback
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