- 您现在的位置：买卖IC网 > PDF目录16794 > MC34704BEPR2 (Freescale Semiconductor)IC PWR MNGMT DC-DC MULT 56-QFN PDF资料下载
参数资料
| 型号： | MC34704BEPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 16/54页 |
| 文件大小： | 0K |
| 描述： | IC PWR MNGMT DC-DC MULT 56-QFN |
| 特色产品： | MC34704 Multi-channel Power Management IC (PMIC) |
| 标准包装： | 1 |
| 应用： | 处理器 |
| 电流 - 电源： | 86mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-VFQFN 裸露焊盘 |
| 供应商设备封装： | 56-QFN-EP（7x7） |
| 包装： | 标准包装 |
| 产品目录页面： | 809 (CN2011-ZH PDF) |
| 其它名称： | MC34704BEPR2DKR |
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页当前第16页第17页第18页第19页第20页第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页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 34704 is an multi-channel power management IC
(PMIC) meant to address power management needs for
various multimedia applications microprocessors in various
configurations with a target overall efficiency of > 80% at
typical loads.
The 34704 accepts an input voltage from various sources:
? 1 cell Li-Ion/Polymer (2.7 to 4.2 V)
? 5.0 V USB supply or AC wall adapter
The different channels are:
REG6
REGULATOR
REG1 (25)
REG2
REG3
REG4
REG5
REG7 (25)
REG8
REGULATOR TYPE
Synchronous Boost
Synchronous Buck-Boost
Synchronous Buck
Synchronous Buck-Boost
Synchronous Buck-Boost
Synchronous Boost
Inverter Boost
Synchronous Boost
V OUT TYP (V)
5.0
2.8 / 3.3
1.2 / 1.5 / 1.8
1.8 / 2.5
3.3
15.0
-7.0
15.0
I OUT TYP (MA)
100
200
150
100
150
20
20
15
I OUT MAX (MA)
500
500
550
300
500
60
60
30
TARGET APPLICATION
+5.0 V REF
μP I/O
μP Core
DDR
μP I/O
REF+
REF -
Backlight Display
Notes
24. Synchronous Buck-Boost: These regulators can work as pure BUCK regulator when the output voltage is lower than the input voltage;
and work as pure BOOST regulator when the input voltage is lower than the output voltage. Compensation should be done for the worst
case scenario, which is in most of the cases when the device is working as a boost converter, after compensating for this scenario it is
recommended to verify the buck operation to assure stability in the whole operating range.
25. Available only on the 34704A
REG1, REG3, REG6, and REG8 use internal
compensation, while REG2, REG4, REG5, and REG7 use
external compensation.
The switching frequency of all regulators except REG6, 7,
& 8 can be selected through the FREQ pin between 750 kHz
and 2.0 MHz in 250 kHz steps. The high frequency operation
is meant to minimize the size of external components while
lower operating frequencies will allow for higher efficiency.
REG7 is limited to operate at a lower frequency to minimize
switching noise induced by driving the external switching
MOSFET, but also can operate at the 1.0 MHz value with
proper board layout. REG 6, 7, and 8 switching frequency can
be selected between 250 kHz and 1.0 MHz in 250 kHz steps
through I 2 C.
For all regulators and at lower loads, a pulse skipping
mode is implemented to maintain high efficiency.
Note that pulse skipping occurs when the regulator enters
into discontinuous conduction mode (DCM) at very light
loads, however transitions between DCM and CCM may
result in noisy switching nodes, therefore it is recommended
to design the regulators to work in CCM all the time. Pulse
skipping function is not guaranteed by circuit implementation.
regulators except REG6, 7, and 8, to spread out the current
draw by the individual converters from the input supply over
time, to reduce the peak input current demand. This allows
for better EMI performance and reduction in the input filter
requirements.
Each regulator except REG1 uses an external feedback
resistor divider to set the output voltage. All output voltages
can be adjusted dynamically (Dynamic Voltage Scaling) on
the fly through an I2C serial interface. All converters, except
REG1, utilize automatic soft-start by ramping the reference
voltage to the error amplifier to prevent sudden change in
duty cycle and output current/voltage at power up. REG1
(VG) will limit the inrush current by implementing a peak
current detect and a constant off time.
The 34704 is equipped with a dual function Power On/Off
pin (ONOFF). This pin can be controlled by a mechanical
switch to turn the device on or off. Pressing and releasing the
mechanical switch turns the 34704 on while pressing and
holding the switch for a time period (programmable through
I 2 C) turns the 34704 off. Enable/disable control is also
granted through I 2 C for groups of regulators and the whole
IC.
The 34704 uses 4 different phases of switching for all
34704
Analog Integrated Circuit Device Data
16
Freescale Semiconductor
相关PDF资料 |
PDF描述 |
|---|---|
| GCB05DHNT | CONN EDGECARD 10POS .050 DIP SLD |
| GCB05DHHT | CONN EDGECARD 10POS .050 DIP SLD |
| H3AAS-1606G | IDC CABLE - HSC16S/AE16G/HSC16S |
| V300C12E150BG2 | CONVERTER MOD DC/DC 12V 150W |
| H3CCH-1606G | IDC CABLE - HKC16H/AE16G/HKC16H |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34705 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 12WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 12WAY |
| MC34707 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 14WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 14WAY 制造商:PRIVATE LABEL 功能描述:HEADER, VERTICAL, 14WAY, Product Range:MULTICOMP - MC34 Series, Contact Terminat 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 14POS, 3MM, Series:2261(5561), Pitch Spacing:3mm, Contact Termination:Through Hole Vertical, No. of Contacts:14, No. of Rows:2, Connector Mounting:PCB, Gender:Receptacle, Contact Material:Copper Alloy , RoHS Compliant: Yes |
| MC34708VK | 功能描述:PMIC 解决方案 PMIC 5S 6LDO BST 10BTADC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MC34708VKR2 | 功能描述:PMIC 解决方案 PMIC 5S 6LDO BST 10BTADC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MC34708VM | 功能描述:PMIC 解决方案 PMIC 5S 6LDO BST 10BtADC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。