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| 型号： | MC34704BEPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 25/54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 |
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FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
? Operates at a switching frequency equals to F SW2
? Drives integrated low R DS(ON) N-channel power
MOSFETs (NVHV_LC) as its output stage
? It offers load disconnect from the input battery when the
output is off (True Cut-Off)
OVERALL EFFICIENCY ANALYSIS
In battery applications, it is highly recommended to power
every single regulator directly from the battery to obtain full
output capability:
? The output is ±4% accuracy
? Output voltage is adjustable by means of an external
resistor divider when in voltage regulation mode
? A 240 mV current limit comparator will be used to program/
sense the voltage drop across the current setting resistor
at the bottom of the LED string connected to the REG8
output when the current regulation mode is selected .
This will be used to program the maximum current flowing
and will regulate it
? The output can be adjusted up or down at 2.5% steps for
a total of 10% on each direction allowing Dynamic Voltage
Scaling
VBAT
VBAT
VBAT
VBAT
VBAT
VBAT
VBAT
VBAT
REG1
REG2
REG3
REG4
REG5
REG6
REG7
REG8
V1 (5.0 V)
V2 (2.8 / 3.3 V)
V3 (1.2 V / 1.5 V / 1.8 V)
V4 (1.8 V / 2.5 V)
V5 (3.3 V)
V6 (15 V)
V7 (-7.0 V)
V8 (15 V)
? Maximum output current is adjustable by means of an
external resistor connected to the FB8 pin and then the
Figure 5. Overall Efficiency Analysis
Efficiency analysis includes the following losses:
output current can be scaled down from the set maximum
in 16 steps through I 2 C interface
? Uses a bootstrap network with an internal diode to power
its synchronous MOSFET
? All gate drive circuits are supplied from VG.
? Uses integrated compensation
? The output is monitored for over-current and short-circuit
conditions
? The regulator is monitored for over-temperature conditions
? The output is monitored for under-voltage and over-
voltage conditions
?
?
?
?
?
?
?
?
MOSFET Conduction Losses
MOSFET Switching Losses (Except for REG7 due to
external MOSFET and board layout dependence)
MOSFET Gate Charging Losses
MOSFET Deadtime Losses
External Diode Losses (Only for REG7)
Inductor Winding DC Losses
Inductor Core Losses (Assumed to be 20% of DC Losses
as a rule of thumb)
Output AC Losses
Operation Modes
The switchers will be active when:
? VG is in regulation AND
? There is no GrpD shutdown command through the I 2 C
interface AND
? No faults exist that would cause GrpD to shut down
Efficiency Analysis
In this configuration, all of the regulators are supplied or
powered directly with 3.6 V nominal, battery voltage.
Efficiency was calculated using the maximum allowed
frequency of 1.5 MHz and 1.0 MHz for F SW1 and F SW2 ,
respectively, in this configuration. As a result, the following
numbers are valid for worst case operation conditions.
The following table shows the detailed analysis for each
regulator with V2 at 3.3 V, V3 at 1.2 V, and V4 at 1.8 V.
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
25
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