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参数资料
| 型号： | PC34703PNB/R2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 稳压器 |
| 英文描述： | 18 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, PQCC33 |
| 封装： | 10 X 10 MM, 2.1 MM HEIGHT, 0.8 PITCH, PLASTIC, QFN-33 |
| 文件页数： | 10/46页 |
| 文件大小： | 2509K |
| 代理商： | PC34703PNB/R2 |
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Analog Integrated Circuit Device Data
18
Freescale Semiconductor
34703
FUNCTIONAL DESCRIPTION
FUNCTIONAL TERMINAL DESCRIPTION
BOOST DRAIN TERMINAL (VBD)
Drain of the internal boost regulator power MOSFET.
VBST (SENSE)
Sense terminal of the internal boost regulator output
voltage.
SERIAL DATA TERMINAL (SDA)
I2C bus terminal. Serial data.
CLOCK SYNCHRONIZATION TERMINAL (CLKSYN)
Oscillator output/synchronization input terminal.
POWER SUPPLY TERMINAL (VDDI)
Internal supply voltage. A ceramic low ESR 1.0 F, 6.0 V
X5R or X7R capacitor is recommended.
GROUND TERMINALS (GND)
Analog ground of the IC, thermal heatsinking.
RESET TIMER TERMINAL (RT)
The Reset Timer power-up delay (RT) terminal is used to
set the delay between the time when the LDO and switcher
outputs are active and stable and the RST output is released.
An external resistor and capacitor are used to program the
timer. The power-up delay can be obtained by using the
following formula:
tD = 10 ms + RtCt
Where Rt is the Reset Timer programming resistor and Ct
is the Reset Timer programming capacitor, both connected in
parallel from RT to ground.
Note Observe the maximum Ct value and expect reduced
accuracy if Rt is less than 10 k.
LINEAR DRIVE TERMINAL (LDRV)
LDO gate drive of the external pass N-channel MOSFET.
LINEAR FEEDBACK TERMINAL (LFB)
Linear regulator feedback terminal.
OUTPUT VOLTAGE TERMINAL (VOUT)
Output voltage of the buck converter. Input terminal of the
switching regulator power sequence control circuit.
INVERTING INPUT TERMINAL (INV)
Buck Controller Error Amplifier inverting input.
BUCK SWITCHER COMPENSATION (COMP)
Output voltage of the buck converter error amplifier.
Compensation terminal.
SWITCH TERMINALS (SW)
Buck regulator switching node. This terminal is connected
to the inductor.
POWER GROUND TERMINALS (PGND)
Buck regulator power ground.
INPUT VOLTAGE 2 TERMINALS (VIN2)
Buck regulator power input. Drain of the high-side power
MOSFET.
BOOTSTRAP TERMINAL (BOOT)
Bootstrap capacitor input.
SWITCHER SLEW RATE CONTROL (SR)
Buck slew rate control terminal. For faster Slew Rates,
connect the terminal to the boot terminal (Boot). For medium
speeds, the terminal should be left open. For slowest options,
connect the terminal to the Switch Terminal (SW).
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