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參數(shù)資料
| 型號： | MAX1965TEEP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Tracking/Sequencing Triple/Quintuple Power-Supply Controllers |
| 中文描述： | 0.05 A SWITCHING CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-20 |
| 文件頁數(shù)： | 17/30頁 |
| 文件大小： | 475K |
| 代理商： | MAX1965TEEP |
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Find a low-loss inductor having the lowest possible DC
resistance that fits in the allotted dimensions. Ferrite
cores are often the best choice, although powdered
iron is inexpensive and can work well at 200kHz. The
chosen inductor
’
s saturation rating must exceed the
peak inductor current:
Setting the Current Limit
The minimum current-limit threshold must be high
enough to support the maximum load current at the
minimum tolerance level of the current-limit circuit. The
valley of the inductor current occurs at I
LOAD(MAX)
minus half of the ripple current:
where R
DS(ON)
is the on-resistance of the low-side
MOSFET (N
L
). For the MAX1964/MAX1965, the mini-
mum current-limit threshold is 190mV (for the typical
250mV default setting). Use the worst-case maximum
value for R
DS(ON)
from the MOSFET N
L
data sheet, and
add some margin for the rise in R
DS(ON)
over tempera-
ture. A good general rule is to allow 0.5% additional
resistance for each
°
C of the MOSFET junction temper-
ature rise.
Connect ILIM to VL for the default 250mV (typ) current-
limit threshold. For an adjustable threshold, connect a
resistive-divider from VL to ILIM to GND. The external
adjustment range of 500mV to 2.5V corresponds to a
current-limit threshold of 106mV to 530mV. When
adjusting the current limit, use 1% tolerance resistors
and a 10μA divider current to prevent a significant
increase in the current-limit tolerance.
MOSFET Selection
The MAX1964/MAX1965
’
s step-down controller drives
two external logic-level N-channel MOSFETs as the cir-
cuit switch elements. The key selection parameters are:
1. On-resistance (R
DS(ON)
)
2. Maximum drain-to-source voltage (V
DS(MAX)
)
3. Minimum threshold voltage (V
TH(MIN)
)
4. Total gate charge (Q
g
)
5. Reverse transfer capacitance (C
RSS
)
The high-side N-channel MOSFET must be a logic-level
type with guaranteed on-resistance specifications at
V
GS
≤
4.5V. Select the high-side MOSFET
’
s on-resis-
tance (R
DS(ON)
) so I
PEAK
R
DS(ON)
≤
225mV for the
V
R
I
LIRI
2
VALLEY LOW
DS ON
(
LOAD MAX
LOAD MAX
(
)
)
(
)
(
)
>
I
I
LIRI
2
PEAK
LOAD MAX
LOAD MAX
=
+
(
)
(
)
M
Tracking/Sequencing Triple/Quintuple
Power-Supply Controllers
______________________________________________________________________________________
17
Figure 4. Adjustable Output Voltage
BST
C1
D1
C2
R2
R1
N
H
N
L
C
BST
R
POK
R
COMP
C
COMP1
C
OUT
C
IN
DH
LX
L
OUTPUT
1.25V TO 5V*
INPUT
4.5V TO 28V
DL
OUT
GND
FB
IN
VL
ILIM
POK
COMP
MAX1964
MAX1965
C
COMP2
* FOR OUTPUT VOLTAGES > 5V, SEE "
OUTPUT VOLTAGE SELECTION
."
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1966 | Low-Cost Voltage-Mode PWM Step-Down Controllers |
| MAX1967EUB | Low-Cost Voltage-Mode PWM Step-Down Controllers |
| MAX1966-MAX1967 | Low-Cost Voltage-Mode PWM Step-Down Controllers |
| MAX1966ESA | Low-Cost Voltage-Mode PWM Step-Down Controllers |
| MAX2003 | NiCd/NiMH Battery Fast-Charge Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1965TEEP-T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1966ESA | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1966ESA+ | 功能描述:電壓模式 PWM 控制器 Voltage-Mode PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1966ESA+T | 功能描述:電壓模式 PWM 控制器 Voltage-Mode PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1966ESA-T | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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