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MC34703R2 Arkusz danych(PDF) 4 Page - Freescale Semiconductor, Inc

Numer części MC34703R2
Szczegółowy opis  10A Switch-Mode Power Supply with LDO Regulator
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Producent  FREESCALE [Freescale Semiconductor, Inc]
Strona internetowa  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC34703R2 Arkusz danych(HTML) 4 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
4
Freescale Semiconductor
34703
PIN CONNECTIONS
4
V
IN1
Input
Input Voltage 1
The input supply pin for the integrated circuit. The internal circuits of the
IC are supplied through this pin.
5
SCL
Input
Serial Clock
I2C bus pin. Serial clock.
6
FREQ
Input
Oscillator Frequency
The switcher oscillator frequency can be adjusted by connecting an
external resistor RF to the FREQ pin. The default switching frequency
(FREQ pin left open or tied to VDDI) is ~300 kHz.
7
ADDR
Input
Address
I2C address selection. This pin can be either left open, tied to VDDI, or
grounded through a 10 k
Ω resistor.
8
RESET
Output
Reset
The Reset pin indicates to the external circuitry when one of the
regulators protection features has been activated. Note, since it is an
open drain output it has to be pulled up to some supply voltage (e.g., the
output of the LDO) by an external resistor.
9
LCMP
Input
Linear Compensation
Linear regulator compensation pin.
10
ISNS
Input
Current Sense
Current sense pin of the LDO to provide overcurrent protection of the
linear regulator’s external power MOSFET. The voltage drop over the
LDO current sense resistor RS is sensed between the ISNS and the LDO
pins. The LDO current limit can be adjusted by selecting the proper value
of the current sense resistor RS.
11
LDO
Input
Linear Regulator
Input pin of the linear regulator power sequence and current limit control
circuits.
12
V
BD
Output
Boost Voltage Drain
Drain of the internal boost regulator's switching power MOSFET.
13
VBST
SENSE
Input
Boost Voltage Sense
Note, this pin must be connected to VBST (pin 1) and is not intended to
provide power to external circuitry.
14
EN1
Input
Enable Pin 1
Enable 1 Input. The combination of the logic state of the Enable 1 and
Enable 2 inputs determine operation mode and type of power sequencing
of the IC.
15
SDA
Input/Output
Serial Data
I2C bus pin. Serial data.
16
CLKSYN
Input/Output
Clock Sync Input/
Oscillator Output
Oscillator synchronization input pin or oscillator output pin. The CLKSYN
pin can be configured either as an oscillator output when the CLKSEL pin
is left open or it can be used as a synchronization input when the CLKSEL
pin is grounded.
17
VDDI
Passive
Vdd Filter
Internal supply voltage capacitor pin. A ceramic low ESR 1.0
µF capacitor
in parallel with a ceramic 100nF capacitor should be connected from this
pin to ground. The VDDI power supply voltage is for internal use only; do
not use externally.
18
GND
Signal
Ground
Analog ground of the IC.
19
RT
Passive
Reset Timer
This pin allows programming the Power-ON Reset delay by means of an
external RC network.
20
LDRV
Output
LDO Gate Drive
LDO gate drive of the external pass N-channel MOSFET.
21
LFB
Input
LDO Feedback
Linear regulator feedback pin.
22
VOUT
Output
Output Voltage Power
Sequencing Control
This pin must be directly connected to the output voltage of the buck
converter. This pin controls the buck regulators output voltage (Vout) in
accordance with the power sequencing control mode set by EN1 and
EN2.
23
INV
Input
Error Amp
Buck Controller Error Amplifier inverting input.
24
COMP
Input
Switcher
Compensation
Buck converter compensation pin.
Table 1. 34703 Pin Definitions (continued)
A functional description of each pin can be found in the Functional Pin Description section beginning on page 15.
Pin Number
Pin Name
Pin Function
Formal Name
Definition


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