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| 型号： | EL7564CMZ-T13 |
| 厂商： | Intersil |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 20SOIC |
| 标准包装： | 1,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1 V ~ 3.8 V |
| 输入电压： | 4.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-SO |
EL7564
T J = 75 + 1.2 – VTJ
NMOS Power FETs and Drive Circuitry
The EL7564 integrates low on-resistance (30m ? ) NMOS
FETs to achieve high efficiency at 4A. In order to use an
NMOS switch for the high-side drive it is necessary to drive
the gate voltage above the source voltage (L X ). This is
accomplished by bootstrapping the V HI pin above the L X
voltage with an external capacitor C VHI and internal switch
and diode. When the low-side switch is turned on and the
L X voltage is close to GND potential, capacitor C VHI is
charged through an internal switch to V DRV , typically 5V. At
the beginning of the next cycle the high-side switch turns
on and the L X pins begin to rise from GND to V IN potential.
As the L X pin rises the positive plate of capacitor C VHI
follows and eventually reaches a value of V DRV + V IN ,
typically 10V, for V DRV = V IN = 5V. This voltage is then
level shifted and used to drive the gate of the high-side
FET, via the V HI pin. A value of 0.22μF for C VHI is
recommended.
Reference
A 1.5% temperature compensated bandgap reference is
integrated in the EL7564. The external V REF capacitor acts
as the dominant pole of the amplifier and can be increased
in size to maximize transient noise rejection. A value of
0.1μF is recommended.
Oscillator
The system clock is generated by an internal relaxation
oscillator with a maximum duty-cycle of approximately 95%.
Operating frequency can be adjusted through C OSC .
When external synchronization is required, always choose
C OSC such that the free-running frequency is at least 20%
lower than that of the sync source to accommodate
component and temperature variations. Figure 21 shows a
typical connection.
Junction Temperature Sensor
An internal temperature sensor continuously monitors die
temperature. In the event that the die temperature exceeds
the thermal trip-point, the system is in a fault state and will
be shut down. The upper and low trip-points are set to 135°C
and 115°C respectively.
The V TJ pin is an accurate indication of the internal silicon
junction temperature (see performance curve.) The junction
temperature T J (°C) can be determined from the following
relation:
-------------------------
0.00384
Where V TJ is the voltage at the V TJ pin in volts.
Power Good and Power On Reset
During power up the output regulator will be disabled until
V IN reaches a value of approximately 4V. About 500mV
hysteresis is present to eliminate noise-induced oscillations.
Under-voltage and over-voltage conditions on the regulator
output are detected through an internal window comparator.
A logic high on the PG output indicates that the regulated
output voltage is within about +10% of the nominal selected
1
20
100pF
BAT54S
2
19
EXTERNAL
OSCILLATOR
390pF
3
5
18
16
6
7
8
9
10
EL7564
15
14
13
12
11
FIGURE 23. OSCILLATOR SYNCHRONIZATION
11
FN7297.3
May 9, 2005
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相关代理商/技术参数 |
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|---|---|
| EL7564CRE | 功能描述:IC REG BUCK SYNC ADJ 4A 28HTSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
| EL7564CRE-T13 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Monolithic 4 Amp DC/DC Step-Down Regulator |
| EL7564CRE-T7 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Monolithic 4 Amp DC/DC Step-Down Regulator |
| EL7564CREZ | 功能描述:直流/直流开关调节器 EL7564CREZ MONO 4 AMP STP DWN SWITCH RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| EL7564CREZ-T13 | 功能描述:直流/直流开关调节器 EL7564CREZ MONO 4 AMP STP DWN SWTCH RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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