MC34701EKR2(2005) データシートの表示（PDF） - Freescale Semiconductor
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MC34701EKR2 Datasheet PDF : 38 Pages
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TERMINAL CONNECTIONS
TERMINAL CONNECTIONS
FREQ
1
INV
2
VOUT
3
VIN2
4
VIN2
5
SW
6
SW
7
GND
8
GND
9
PGND
10
PGND
11
VBD
12
VBST
13
BOOT
14
SDA
15
SCL
16
32
CLKSYN
31
CLKSEL
30
RST
29
RT
28
EN2
27
EN1
26
ADDR
25
GND
24
GND
23
VDD1
22
VIN1
21
LDRV
20
CS
19
LDO
18
LFB
17
LCMP
Figure 3. Terminal Connections
Table 1. Terminal Function Description
A functional description of each terminal can be found in the FUNCTIONAL TERMINAL DESCRIPTION section beginning
on page 15.
Terminal
Terminal
Name
Formal Name
Definition
1
2
3
4, 5
6, 7
8, 9
24, 25
10, 11
12
13
14
15
16
17
18
19
FREQ
INV
VOUT
VIN2
SW
GND
PGND
VBD
VBST
BOOT
SDA
SCL
LCMP
LFB
LDO
Oscillator Frequency
Inverting Input
Output Voltage
Input Voltage 2
Switch
Ground
This switcher frequency selection terminal can be adjusted by connecting external
resistor RF to the FREQ terminal. The default switching frequency (FREQ terminal
left open or tied to VDDI) is set to 300 kHz.
Buck Controller Error Amplifier inverting input.
Output voltage of the buck converter. Input terminal of the switching regulator power
sequence control circuit.
Buck regulator power input. Drain of the high-side power MOSFET.
Buck regulator switching node. This terminal is connected to the inductor.
Analog ground of the IC, thermal heatsinking.
Power Ground
Boost Drain
Boost Voltage
Bootstrap
Serial Data
Serial Clock
Linear Compensation
Linear Feedback
Linear Regulator
Buck regulator power ground.
Drain of the internal boost regulator power MOSFET.
Internal boost regulator output voltage. The internal boost regulator provides a
20 mA output current to supply the drive circuits for the integrated power MOSFETs
and the external N-channel power MOSFET of the linear regulator. The voltage at
the VBST terminal is 7.75V nominal.
Bootstrap capacitor input.
I2C bus terminal. Serial data.
I2C bus terminal. Serial clock.
Linear regulator compensation terminal.
Linear regulator feedback terminal.
Input terminal of the linear regulator power sequence control circuit.
Analog Integrated Circuit Device Data
Freescale Semiconductor
34701
3
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