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| 型號(hào)： | LM2650 |
| 文件頁數(shù)： | 2/11頁 |
| 文件大小： | 215K |
| 代理商： | LM2650 |
Connection Diagram
Pin Descriptions
(Refer to the Block Diagrams)
Pins
Description
1, 12
SUB
: These pins make electrical contact with the substrate of the die. Ground them. For best thermal
performance, ground them to the same large, uninterrupted copper plane as the PGND pins.
SLEEP LOGIC
: Use this logic input to select the conversion mode; low selects PWM, high selects sleep, and
high impedance (open) permits the LM2650 to move freely and automatically between the modes, using PWM
for moderate to heavy loads and sleep for light loads.
PGND
: The ground return of the power stage. The power stage consists of the two power switches Q1 and
Q2, the gate drivers DH and DL, and the linear voltage regulators VRegH and VRegL. For best electrical and
thermal performance, ground these pins to a large, uninterrupted copper plane.
SW
: The output node of the power stage. It swings from slightly below ground to slightly below the voltage to
PV
IN
. To minimize the effects of switching noise on nearby circuitry, keep all traces originating from SW short
and to the point. Route all traces carrying signals well away from the SW traces.
PV
IN
: The positive supply rail of the power stage. Bypass each PV
IN
pin to PGND with a 0.1 μF capacitor. Use
capacitors having low ESL and low ESR, and locate them close to the IC.
BOOT
: The positive supply rail of the high-side gate driver DH. Connect a 0.1 μF capacitor from this node to
SW. Bootstrapping action creates a supply rail about 9V above that at PV
IN
, and DH uses this rail to override
the gate of the NMOS power FET Q1. Overriding ensures low R
DS(on)
.
FB
: The feedback input.
V
DD
: An internal regulator steps the input voltage down to a 4V rail used by the signal-level circuitry. V
DD
is the
output node of this regulator. Bypass V
DD
to GND close to the IC with a 0.2 μF capacitor.
COMP
: The inverting input of the error amplifier EA.
EA OUT
: The output node of the error amplifier EA.
SS
: The soft start node. Connect a capacitor from SS to GND.
GND
: The ground return of the signal-level circuitry.
V
IN
: The positive supply rail of the internal 4V regulator. Bypass V
IN
to GND close to the IC with a 0.1 μF
capacitor.
FREQ ADJ
: The LM2650 switches at a nominal 90 kHz. Connect a resistor between FREQ ADJ and GND to
adjust the frequency up from the nominal. Use the graph under Typical performance Characteristics to select
the resistor.
SYNC
: The synchronization input. If the switching frequency is to be synchronized with an external clock
signal, apply the clock signal here. Ground if not used.
SD
: Use this logic input to control shutdown; pull low for operation, high for shutdown.
SLEEP OUT ADJ (SOA)
: The value of the resistor connected between SIA and ground programs the sleep-in
threshold. Higher values program lower thresholds.
SLEEP IN ADJ (SIA)
: The value of the resistor connected between SIA and ground programs the sleep-in
threshold. Higher values program lower thresholds.
2
3, 4, 9, 10
5, 8
6, 7
11
13
14
15
16
17
18
19
20
21
22
23
24
DS012848-14
Top View
24-Lead Small Outline Package (M)
Order Number LM2650M-ADJ
See Package Number M24B
L
www.national.com
2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2650M-ADJ | IC-SM-DC-DC CONVERTER |
| LM2651 | |
| LM2651MTC-1.8 | Current-Mode SMPS Controller |
| LM2651MTC-2.5 | Current-Mode SMPS Controller |
| LM2651MTC-ADJ | Current-Mode SMPS Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2650EVAL | 功能描述:電源管理IC開發(fā)工具 EVAL BOARDFOR LM2650 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM2650EVAL/NOPB | 功能描述:EVALUATION BOARD FOR LM2650X RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM2650M-ADJ | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| LM2650M-ADJ | 制造商:Texas Instruments 功能描述:DC/DC CONVERTER ADJ 2650 SOIC24 |
| LM2650M-ADJ/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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