参数资料
| 型号： | MC34703PNB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 28/46页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY QUICC 33-QFN |
| 标准包装： | 1 |
| 应用： | 电源 |
| 电流 - 电源： | 60mA |
| 电源电压： | 2.8 V ~ 13.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 33-PowerQFN |
| 供应商设备封装： | 33-PQFN（10x10） |
| 包装： | 管件 |
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TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
+3V3
+3V3
VIN1
VIN1
VDDI
VDDI
reference
+3V3
+3V3
VBST
VBD
Voltage
Regulator
Boost
Control
2
Vref 3
VDDI
Supply
VBST
1
VDDI
Power
Sequencing
Bandgap
Vref
VDDI
Vref
VBST
Powerdown
UVLO
VLDO
VBST
Linear
Regulator
Control
with
ILim
Pwr Seq.
Q4
LDRV
ISNS
LDO
LFB
LCMP
VLDO = 2V5 @ 2 A
EN1
VOUT
VBST
EN2
RT
RESET
Reset
Control
POR
Timer
Voltage
Margining
Reset Watchdog Timer
INV
SysCon
LFB
Current Limit
SR
VDDI
Buck
Control
Logic
Buck
HS
and
LS
Driver
Q1
Q2
BOOT
VIN2
SW
PGND
VBD
+3V3
SR
ADDR
Slew
Rate
VDDI
7
5
6
7
5
6
0.8 V
INV
VOUT = 1V2 @ 10 A
SDA
SCL
I2C
Oscillator
Ramp
Generator
Pwr Seq.
Q3
VOUT
CLKSEL CLKSYN
FREQ
GND
COMP
Figure 27. 34703 Typical Application
BOOST REGULATOR
When the input voltage to be used is less than 8.0 V, the
boost regulator should be used. The boost regulator is made
active by adding a small external inductor, and provides an
output voltage of 8.0 V nominal value for driving the gates of
the buck regulator power MOSFETs, the linear regulator
power MOSFET gate, and also for the internal V ddi supply.
The boost inductor value should be at least 10 uH for the
proper boost operation. NOTE: If the input voltage to be used
is greater than 8 V, the boost regulator must not be
implemented, and the boost inductor, if present, must be
removed from the circuit. A 0.1 μF capacitor is recommended
to be added at Pin VBST for filtering high frequency noise in
BUCK REGULATOR
Output Voltage Setting
The buck output voltage is set by an external resistor
network (R 9 and R 14 ) and an internal reference voltage. The
external resistor network feeds back the dc output voltage,
and an error amplifier compares it with an internal reference
voltage V ref (See Figure 28 ). The buck output voltage can be
calculated from the following equation:
V output = V vef × ( 1 + R 9 ? R 14 )
the system board.
Where V ref designed in MC34703 is 0.8 V typ.
34703
Analog Integrated Circuit Device Data
28
Freescale Semiconductor
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