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参数资料
| 型号： | MC34710EWR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY ADJ DUAL SW 32SOIC |
| 产品变化通告： | AMPD Product Discontinuation 12/Dec/2012 |
| 标准包装： | 1,000 |
| 应用： | 通用，监控器，序列 |
| 电流 - 电源： | 7.5mA |
| 电源电压： | 13 V ~ 32 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-SSOP（0.295"，7.50mm 宽）裸露焊盘 |
| 供应商设备封装： | 32-SOICW 裸露焊盘 |
| 包装： | 带卷 (TR) |
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
V I /O Switching Regulator
The V I /O switching regulator output voltage is determined
by the Mode digital input pins. The 34710’s Mode pins select
the output voltage. For example, if Mode2, Mode1, and
Mode0 are set to 0, 0, 0 (respectively) then V I /O will be set
to 5.0V; if Mode2, Mode1, and Mode0 are all left floating (i.e.,
Open, Open, and Open), then the voltage for V I /O will be set
voltage + 0.8V. (I.e., 0.8V is the LDO regulator drop out
voltage.)
The Mode pins select the output voltage as depicted in
Table 5. V I /O and V CORE Regulator
Output Voltage Selection
to 3.3V. Table 5 provides the truth table for setting the various
combination of regulator outputs via the Mode pins.
The topology of the regulator is a hysteretic buck regulator
operating from the internal ~200kHz oscillator.
V CORE Linear Regulator
The V CORE linear LDO (low drop-out) regulator can
produce either a +3.3V, 2.5V, 1.8V, or 1.5V output voltage at
currents up to 500mA. The input to the VCORE regulator is a
pin that may be connected to the V I /O regulator output or to
an external power supply. Note, the minimum input voltage
Mode2
0
0
0
0
Open
Open
Open
Open
Mode1
0
0
Open
Open
0
0
Open
Open
Mode0
0
Open
0
Open
0
Open
0
Open
V I /O (V)
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
V CORE (V)
3.3
2.5
1.8
1.8
2.5
2.5
1.5
1.5
level must be equal to or greater than the selected V CORE
Open indicates pin is not connected externally (i.e. floating).
FUNCTIONAL PIN DESCRIPTION
POWER SUPPLY INPUT (B+)
Main supply voltage for the V I/O Switching Regulator and
general chip bias circuitry.
CORE VOLTAGE REGULATOR INPUT (LIN B+)
Supply voltage for the V CORE Regulator. May be provided
by the V I/O regulator output or from an independent supply.
MODE CONTROL (MODE 0,1,2)
Mode select pins to select the V I/O and V CORE output
voltages per table 2. Pull to ground for low state, float for high
state.
SWITCHING CAPACITORS 1 AND 2 (CP1/CP2)
fault conditions. This pin has no input function and requires
an external pull-up resistor.
The RST pin is an open drain output driver to prevent
oscillations during the transition. It is recommended to
connect a 0.1uF capacitor between the CT pin and RST pin.
Note: error conditions must be present for a minimum time,
t FILTER , before the 34710 responds to them. Once all error
conditions have been cleared, RST is held low for an
additional time of t DELAY .
RESET DELAY CAPACITOR (CT)
This pin is the external delay. It is used with a capacitor to
ground to delay RST turn-on time and to RST to prevent RST
oscillations during chip power-on.
Pins for the Charge Pump capacitor.
VI/O SWITCHING REGULATOR FEEDBACK (VFB)
BOOST VOLTAGE (VB)
The Boost Voltage is an output pin used for the charge
pump boost voltage and is a connection point for the Charge
Pump bulk capacitor.It provides a gate drive for the V I/O
Switch FET.
RESET (RST)
This pin is the feedback input for the V I/O Switching
Regulator and the output of the regulator application.
VI/O SWITCHING REGULATOR OUTPUT
(VSWITCH)
This pin is the Switching output for the V I/O Buck
Regulator. It has internal high side FET.
Reset is an output pin for supervisory functions. This pin is
in high state during normal operation and low state during
34710
Analog Integrated Circuit Device Data
Freescale Semiconductor
9
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