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LP3972 bảng dữ liệu(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
tên linh kiện LP3972
Giải thích chi tiết về linh kiện  Power Management Unit for Advanced Application Processors
PDF  59 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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LP3972 bảng dữ liệu(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
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