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参数资料
| 型号： | MC34704BEPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 23/54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
when REG3 is powered up in the sequence.
The switcher will operate in DCM at very light loads to
allow pulse skipping.
VOUT3 will be discharged every time the regulator is
shutting down and it will be held low by the discharge FET as
long as possible.
Characteristics
? It powers up directly from the battery
? Operates at a switching frequency equals to F SW1
? Drives integrated low R DS(ON) N-channel power
MOSFETs (NHV_HC) as its output stage
? The output is ±4% accuracy
? Output voltage is adjustable by means of an external
resistor divider
? The output can be adjusted up or down at 2.5% steps to
achieve from +17.5% to -20.0% on each direction allowing
Dynamic Voltage Scaling using the I 2 C DVS register.
? An extra fine voltage scaling in 0.5% steps helps to adjust
down the output voltage as low as 40%.
? Uses a bootstrap network with an internal diode to power
its switch MOSFET
? All gate drive circuits are supplied from VG.
? Uses integrated compensation.
? The output is monitored for under-voltage and over-
voltage conditions
? The output is monitored for over-current and short-circuit
conditions
? The regulator is monitored for over-temperature conditions
Operation Modes
The switcher will be active when:
? VG is in regulation AND
? There is no GrpB shutdown command through the I 2 C
interface AND
? No faults exist that would cause GrpB to shut down
REG4
This is a 4-switch synchronous buck-boost PWM voltage-
mode control DC/DC regulator.
when REG4 is powered up in the sequence.
The switcher will operate in DCM at very light loads to
allow pulse skipping.
VOUT4 will be discharged every time the regulator is
shutting down and it will be held low by the discharge FET as
long as possible.
Characteristics
? It powers up directly from the battery
? Operates at a switching frequency equals to F SW1
? Drives integrated low R DS(ON) N-channel power
MOSFETs (NHV_HC) as its output stage
? The output is ±2% accuracy
? Output voltage is adjustable by means of an external
resistor divider
? The output can be adjusted up or down at 2.5% steps for
a total of +17.5% to -20.0% on each direction allowing
Dynamic Voltage Scaling.
? Uses bootstrap networks with an internal diode to power
its high side MOSFETs
? All gate drive circuits are supplied from VG.
? Uses external compensation
? The output is monitored for under-voltage and over-
voltage conditions
? The output is monitored for over-current and short-circuit
conditions
? The regulator is monitored for over-temperature conditions
Operation Modes
The switcher will be active when:
? VG is in regulation AND
? There is no GrpB shutdown command through the I 2 C
interface AND
? No faults exist that would cause GrpB to shut down
REG5
This is a 4-switch synchronous buck-boost PWM voltage-
mode control DC/DC regulator.
on when REG5 is powered up in the sequence.
The switcher will operate in DCM at very light loads to
allow pulse skipping.
VOUT5 will be discharged every time the regulator is
shutting down and it will be held low by the discharge FET as
long as possible.
Characteristics
? It powers up directly from the battery
? Operates at a switching frequency equals to F SW1
? Drives integrated low R DS(ON) N-channel power
MOSFETs (NHV_HC) as its output stage
? The output is ±2% accuracy
? Output voltage is adjustable by means of an external
resistor divider
? The output can be adjusted up or down at 2.5% steps for
a total of +17.5% to -20.0% on each direction allowing
Dynamic Voltage Scaling.
? Uses bootstrap networks with an internal diodes to power
its high side MOSFETs
? All gate drive circuits are supplied from VG.
? Uses external compensation
? The output is monitored for under-voltage and over-
voltage conditions
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
23
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