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參數(shù)資料
| 型號： | RT8004 |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | 3A, 4MHz, Synchronous Step-Down Regulator |
| 中文描述： | 第3A，4MHz，同步降壓型穩(wěn)壓器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 257K |
| 代理商： | RT8004 |
RT8004
13
DS8004-03 September 2007
www.richtek.com
As an example, consider the RT8004 in dropout at an
input voltage of 3.3V, a load current of 3A and an ambient
temperature of 70
°
C. From the typical performance graph
of switch resistance, the R
DS(ON)
of the P-Channel switch
at 70
°
C is approximately 97m
Ω
. Therefore, power
dissipated by the part is :
P
D
= (I
LOAD
)
2
(R
DS(ON)
) = (3A)
2
(97m
Ω
) = 0.873W
For the TSSOP package, the
θ
JA
is 47
°
C/W. Thus the
junction temperature of the regulator is :
T
J
= 70
°
C+(0.873W) (47
°
C/W) = 111
°
C
Which is below the maximum junction temperature of
125
°
C. Note that at higher supply voltages, the junction
temperature is lower due to reduced switch resistance
(R
DS(ON)
).
Checking Transient Response
The regulator loop response can be checked by looking
at the load transient response. Switching regulators take
several cycles to respond to a step in load current. When
a load step occurs, V
OUT
immediately shifts by an amount
equal to
Δ
I
LOAD
(ESR), where ESR is the effective series
resistance of C
OUT
.
Δ
I
LOAD
also begins to charge or
discharge C
OUT
generating a feedback error signal used
by the regulator to return V
OUT
to its steady-state value.
During this recovery time, V
OUT
can be monitored for
overshoot or ringing that would indicate a stability problem.
The COMP pin external components and output capacitor
shown in Typical Application Circuit will provide adequate
compensation for most applications.
Layout Considerations
Follow the PCB layout guidelines for optimal performance
of RT8004.
z
A ground plane is recommended. If a ground plane layer
is not used, the signal and power grounds should be
segregated with all small-signal components returning
to the GND pin at one point that is then connected to
the PGND pin close to the IC. The exposed pad should
be connected to GND.
z
Connect the terminal of the input capacitor(s), C
IN
, as
close as possible to the PVDD pin. This capacitor
provides the AC current into the internal power
MOSFETs.
z
LX node is with high frequency voltage swing and should
be kept small area. Keep all sensitive small-signal nodes
away from LX node to prevent stray capacitive noise
pick-up.
z
Flood all unused areas on all layers with copper.
Flooding with copper will reduce the temperature rise
of power components. You can connect the copper areas
to any DC net (PVIN, SVIN, V
OUT
, PGND, SGND, or
any other DC rail in your system).
z
Connect the FB pin directly to the feedback resistors.
The resistor divider must be connected between V
OUT
and GND.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| RT8004PCP | 3A, 4MHz, Synchronous Step-Down Regulator |
| RT8004PQV | 3A, 4MHz, Synchronous Step-Down Regulator |
| RT8004PS | 3A, 4MHz, Synchronous Step-Down Regulator |
| RT8004QCP | 3A, 4MHz, Synchronous Step-Down Regulator |
| RT8004QQV | 3A, 4MHz, Synchronous Step-Down Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RT8004GCP | 功能描述:IC REG BUCK SYNC ADJ 3A 16TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:5 V ~ 25 V 輸入電壓:2.3 V ~ 5.5 V PWM 型:電流模式 頻率 - 開關(guān):600kHz，1.2MHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:8-MSOP |
| RT8004GQV | 功能描述:IC REG BUCK SYNC ADJ 3A 16VQFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:5 V ~ 25 V 輸入電壓:2.3 V ~ 5.5 V PWM 型:電流模式 頻率 - 開關(guān):600kHz，1.2MHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:8-MSOP |
| RT8004PCP | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:3A, 4MHz, Synchronous Step-Down Regulator |
| RT8004PQV | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:3A, 4MHz, Synchronous Step-Down Regulator |
| RT8004PS | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:3A, 4MHz, Synchronous Step-Down Regulator |
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