- 您现在的位置：买卖IC网 > PDF目录1839 > MAX17014ETM+T (Maxim Integrated Products)IC PWR SUPPLY MULT-OUTPUT 48TQFN PDF资料下载
参数资料
| 型号： | MAX17014ETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/33页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY MULT-OUTPUT 48TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 8mA |
| 电源电压： | 8 V ~ 16.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（7x7） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页
Low-Cost Multiple-Output
Power Supply for LCD TVs
During the first half-cycle, N1 turns on and charges fly-
ing capacitors C20 and C21 (Figure 3). During the sec-
ond half cycle, N1 turns off and P1 turns on, level
shifting C20 and C21 by V SUP volts. If the voltage
across C23 plus a diode drop (V OUT + V D ) is smaller
than the level-shifted flying capacitor voltage (V C20 +
V SUP ), charge flows from C20 to C23 until the diode
(D5) turns off. The amount of charge transferred to the
output is determined by the error amplifier that controls
N1’s on-resistance.
The positive charge-pump regulator’s startup can be
delayed by connecting an external capacitor from
DEL2 to GND. An internal constant-current source
begins charging the DEL2 capacitor when EN2 is logic-
high, and the step-down regulator reaches regulation.
When the DEL2 voltage exceeds V REF , the positive
charge-pump regulator is enabled. Each time it is
enabled, the positive charge-pump regulator goes
through a soft-start routine by ramping up its internal
reference voltage from 0 to 1.25V in 128 steps. The
soft-start period is 3ms (typ) and FBP fault detection is
disabled during this period. The soft-start feature effec-
tively limits the inrush current during startup.
Negative Charge-Pump Regulator
The negative charge-pump regulator is typically used to
generate the negative supply rail for the TFT LCD gate
driver ICs. The output voltage is set with an external
MAX17014
OSC
resistive voltage-divider from its output to REF with the
midpoint connected to FBN. The number of charge-
pump stages and the setting of the feedback divider
determine the output of the negative charge-pump reg-
ulator. The charge-pump controller includes a high-side
p-channel MOSFET (P2) and a low-side n-channel
MOSFET (N2) to control the power transfer as shown in
Figure 4.
During the first half cycle, P2 turns on, and flying
capacitor C13 charges to V SUP minus a diode drop
(Figure 4). During the second half cycle, P2 turns off,
and N2 turns on, level shifting C13. This connects C13
in parallel with reservoir capacitor C12. If the voltage
across C12 minus a diode drop is greater than the volt-
age across C13, charge flows from C12 to C13 until the
diode (D3) turns off. The amount of charge transferred
from the output is determined by the error amplifier,
which controls N2’s on-resistance.
The negative charge-pump regulator is enabled when
EN1 is logic-high and the step-down regulator reaches
regulation. Each time it is enabled, the negative
charge-pump regulator goes through a soft-start rou-
tine by ramping down its internal reference voltage
from 1.25V to 250mV in 102 steps. The soft-start period
is 3ms (typ) and FBN fault detection is disabled during
this period. The soft-start feature effectively limits the
inrush current during startup.
INPUT
SUPPLY
IN
P2
REF
0.25V
ERROR
AMPLIFIER
DRVN
C13
D3
OUTPUT
N2
C12
GND1
R1
NEGATIVE CHARGE-PUMP REGULATOR
FBN
REF
R2
Figure 4. Negative Charge-Pump Regulator Block Diagram
______________________________________________________________________________________
21
相关PDF资料 |
PDF描述 |
|---|---|
| MAX17017GTM+ | IC PWR SUPPLY CONTROLLER 48TQFN |
| MAX17019ATM+T | IC VOLT CTRL QUAD OUT 48-TQFN-EP |
| MAX17020ETJ+ | IC CTLR PWM DUAL STEP DN 32-TQFN |
| MAX17022ETA+T | IC GAUGE 1WIRE UART 8TDFN |
| MAX17024ETD+T | IC REG CTRLR DIVIDER PWM 14TDFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17014EVKIT+ | 功能描述:电源管理IC开发工具 MAX17014 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX17015AETP+ | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17015AETP+T | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17015BETP+ | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17015BETP+T | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。