參數(shù)資料
型號(hào): TPS22949ADRGR
廠(chǎng)商: TEXAS INSTRUMENTS INC
元件分類(lèi): 電源管理
英文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝: 3 X 3 MM, GREEN, PLASTIC, SON-8
文件頁(yè)數(shù): 11/28頁(yè)
文件大?。?/td> 1001K
代理商: TPS22949ADRGR
VIN
RPU
V
(1.8 V, 100 mA)
OUTLDO
OC
VOUTCL
V+
CIN
CCL
CLDO
EN1
EN2
VIN
GND
TPS22949
TPS22949A
V+
VOUTLDO
OC
VOUTCL
0
0.0005
0.001
0.0015
0.002
0.0025
Time (s)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
V
o
lta
g
e
(V
)
VIN
VOUTCL
VLDO
V
= V = V
= V
= 3.3 V
C
= 4.7
F, C
= 2.2
F
C
= 2.2 F
IN
+
EN1
EN2
IN
CL
LDO
m
www.ti.com
SLVS908C – FEBRUARY 2009 – REVISED JANUARY 2010
On TPS22949A, the storage capacitor (CCL) is not required. TPS22949A integrates an additional internal circuitry
that increases the current limit of the switch to approximately 750 mA (i.e ILIM(INRUSH)) for about 250 μs (i.e
tINRUSH), initiated when the internal circuitry of the LDO is operating properly (i.e., when the UVLO of the LDO
bias (V+) is disabled (V+ > 2.6 V). Because the current limit is increased during the power-up sequence, a
potential inrush current through the LDO is not interpreted by the current limiter as an over-current. The current
needed by the LDO is then be supplied by the input capacitor (CIN) of the current limiter (see Figure 45).
The TPS22949 LDO (VOUTLDO) is designed to be stable with standard ceramic capacitors with values of 2.2 μF or
larger at the output. X5R- and X7R-type capacitors are best because they have minimal variation in value and
ESR over temperature. Maximum ESR should be less than 250 m
illustrate the behavior of the TPS22949 and TPS22949A with a 100-mA sinking load and different capacitor
values for a typical application where both enables are tied to the same input voltage (see Figure 43).
Figure 43. TPS22949/TPS22949A Typical Application With Both Enable Pins Tied to the Input Voltage
Figure 44. TPS22949 Power-Up Sequence
Copyright 2009–2010, Texas Instruments Incorporated
19
Product Folder Link(s): TPS22949 TPS22949A
相關(guān)PDF資料
PDF描述
TPS2301IPWRG4 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20
TPS2300IPWRG4 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20
TPS2306DWG4 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
TPS2340APFPRG4 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP80
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