參數資料
型號: TPS65950ZXNR
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PBGA209
封裝: 7 X 7 MM, 0.40 MM PITCH, PLASTIC, BGA-209
文件頁數: 107/167頁
文件大?。?/td> 2566K
代理商: TPS65950ZXNR
4.1.3
VIO Dc-dc Regulator
4.1.3.1 VIO Dc-dc Regulator Characteristics
TPS65950
Integrated Power Management/Audio Codec
SWCS032 – OCTOBER 2008
www.ti.com
The I/Os and memory dc-dc regulator is a 600-mA stepdown dc-dc converter (internal FET) with a choice
of two output voltage settings. It supplies the memories and all I/O ports in the application and is one of
the first power providers to switch on in the power-up sequence. This dc-dc regulator can be placed in
sleep or power-down mode; however, care must be taken in the sequencing of this power provider,
because numerous electrostatic discharge (ESD) blocks are connected to this supply. Table 4-4 lists the
characteristics of the regulator.
Table 4-4. VIO Dc-dc Regulator Characteristics
Parameter
Comments
Min(1)
Typ(2)
Max(3)
Unit
Input voltage range
2.7
3.6
4.5
V
1.8
Output voltage(4)
V
1.85
–4%
4%
Output accuracy (5)
–3%
3%
Switching frequency
3.2
MHz
IO = 10 mA, sleep
85%
Conversion efficiency(6) Figure 4-6 in active mode
and sleep modes
100 mA < IO < 400 mA
85%
400 mA < IO < 600 mA
80%
On mode
600
mA
Output current
Sleep mode
10
Ground current (IQ)
Off at 30
°C
1
A
Sleep, unloaded
50
Active, unloaded, not switching
300
Load transient(7)
50
mV
Line transient
300 mVPP ac, input rise and fall time 10 s
10
mV
Start-up time
0.25
1
ms
Recovery time
From sleep mode to on mode with constant
<10
100
s
load
Value
0.7
1
1.3
H
External coil
DCR
0.1
Saturation current
900
mA
Value
8
10
12
F
External capacitor
ESR at switching frequency
1
20
m
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
(4)
This voltage is tuned according to the platform and transient requirements.
(5)
±4% accuracy includes all variations (line and load regulation, line and load transient, temperature, process).
±3% accuracy is DC accuracy only.
(6)
VBAT = 3.8 V, VIO = 1.8 V, Fs = 3.2 MHz, L = 1
H, L
DCR = 100 m, C = 10 F, ESR = 10 m
(7)
Load transient can also be specified as 0 < IO < IOUTmax/2, Δt = 1 s, 100 mV but this is not included in ±4% accuracy.
Power Module
44
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