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LP3972 数据表(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部件名 LP3972
功能描述  Power Management Unit for Advanced Application Processors
PDF  59 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LP3972 数据表(HTML) 13 Page - National Semiconductor (TI)

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Buck Converters SW1, SW2, SW3
Unless otherwise noted, V
IN = 3.6V, CIN = 10 µF, COUT = 10 µF, LOUT = 2.2 µH ceramic. Typical values and limits appearing in
normal type apply for T
J = 25˚C. Limits appearing in boldface type apply over the entire junction temperature range for opera-
tion, −40˚C to +125˚C. (Notes 2, 6, 12) and (Note 13).
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
OUT
Output Voltage Accuracy
Default V
OUT
−3
+3
%
Eff
Efficiency
Load Current = 500 mA
95
%
I
SHDN
Shutdown Supply Current
EN is de-asserted
0.1
µA
Sync Mode Clock Frequency
Synchronized from 13 MHz System
Clock
10.4
13
15.6
MHz
f
OSC
Internal Oscillator Frequency
2.0
MHz
I
PEAK
Peak Switching Current Limit
2.1
2.4
A
I
Q
Quiescent Current “On”
No Load PFM Mode
21
µA
No Load PWM Mode
200
R
DSON (P)
Pin-Pin Resistance PFET
240
m
Ω
R
DSON (N)
Pin-Pin Resistance NFET
200
m
Ω
T
ON
Turn On Time
Start up from Shut-down
500
µsec
C
IN
Input Capacitor
Capacitance for Stability
8
µF
C
O
Output Capacitor
Capacitance for Stability
8
µF
Buck 1 Output Efficiency vs. Load Current Varied from 1mA to 1.5 Amps
V
IN = 3, 3.5 volts VOUT = 1.4 volts Forced PWM
V
IN = 4.0-4.5 volts VOUT = 1.4 volts Forced PWM
20207634
20207635
V
IN = 3, 3.5 volts VOUT = 1.4 volts Forced PWM
Line Transient Response
V
IN = 3 – 3.6 V, VOUT = 1.2 V, 250 mA load
20207636
20207637
www.national.com
13



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