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參數資料
| 型號： | TPS65251RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, VQFN-40 |
| 文件頁數： | 5/31頁 |
| 文件大小： | 1827K |
| 代理商： | TPS65251RHAT |
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TPS65251
C25
100pF
R22
20K
C24
4700pF
R20
40.2K
R21
32K
1.8V 2A
L2
4.7uH
GND
VIN
LX3
VIN
LX3
GND
C23
4.7nF
BST3
VIN3
EN3
F
B
1
S
1
S
Y
N
C
M
P
1
R
O
S
C
R
L
IM
1
C
M
P
3
R
L
IM
3
F
B
3
S
3
LX2
BST2
LX1
VIN2
LX2
EN2
VIN1
EN1
LX1
BST1
C
M
P
2
G
N
D
F
B
2
L
O
W
_
P
S
2
V
7
V
A
G
N
D
P
G
O
D
V
3
V
C11
22uF
R10
40.2K
R11
80.6K
1.2V 3A
L1
4.7uH
C13
4.7nF
R13
100K
C15
100pF
R12
20K
C14
4700pF
V2
V1
VIN1
C10
47nF
C27
4.7nF
C17
4.7nF
VIN
C35
100pF
R32
20K
C34
4700pF
C36
4.7nF
R1
383K
C26
4.7nF
C21
22uF
FB2
LP
PG
C1
10uF
C2
3.3uF
C37
4.7nF
C31
22uF
R30
40.2K
R31
12.7K
3.3V 2A
C33
4.7nF
V3
C30
47nF
VIN3
VIN
C20
47nF
VIN2
C16
4.7nF
L3
4.7uH
R23
150K
R
L
IM
2
R33
120K
www.ti.com
SLVSAA4B – JUNE 2010 – REVISED JANUARY 2011
TYPICAL APPLICATION CIRCUIT
OVERVIEW
TPS65251 is a power management IC with three step-down buck converters. Both high-side and low-side
MOSFETs are integrated to provide fully synchronous conversion with higher efficiency. TPS65251 can support
4.5-V to 18-V input supply, high load current, 300-kHz to 2.2-MHz clocking. The buck converters have an
optional PSM mode, which can improve power dissipation during light loads. Alternatively, the device implements
a constant frequency mode by connecting the LOW_P pin to ground. The wide switching frequency of 300 kHz to
2.2 MHz allows for efficiency and size optimization. The switching frequency is adjustable by selecting a resistor
to ground on the ROSC pin. The SYNC pin also provides a means to synchronize the power converter to an
external signal. Input ripple is reduced by 180 degree out-of-phase operation between Buck 1 and Buck 2. Buck
3 operates in phase with Buck 2.
All three buck converters have peak current mode control which simplifies external frequency compensation. A
traditional type II compensation network can stabilize the system and achieve fast transient response. Moreover,
an optional capacitor in parallel with the upper resistor of the feedback divider provides one more zero and
makes the crossover frequency over 100 kHz.
Each buck converter has an individual current limit, which can be set up by a resistor to ground from the RLIM
pin. The adjustable current limiting enables high efficiency design with smaller and less expensive inductors.
The device has two built-in LDO regulators. During a standby mode, the 3.3-V LDO and the 6.5-V LDO can be
used to drive MCU and other active loads. By this, the system is able to turn off the three buck converters and
improve the standby efficiency.
The device has a power good comparator monitoring the output voltage. Each converter has its own soft start
and enable pins, which provide independent control and programmable soft start.
Copyright 2010–2011, Texas Instruments Incorporated
13
Product Folder Link(s): TPS65251
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS65252EVM | 功能描述:電源管理IC開發工具 TPS65252 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS65252RHDR | 功能描述:PMIC 解決方案 4.5-16V Inp w/ 2 BUCK CONVERTER RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65252RHDT | 功能描述:PMIC 解決方案 4.5-16V Inp w/ 2 BUCK CONVERTER RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65253EVM | 功能描述:電源管理IC開發工具 TPS65253 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS65253RHDR | 功能描述:PMIC 解決方案 4.5V-16Vin/2 Buck Converters RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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