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MC34701EKR2 Datenblatt(PDF) 3 Page - Freescale Semiconductor, Inc

Teilenummer MC34701EKR2
Bauteilbeschribung  1.5 A Switch-Mode Power Supply with Linear Regulator
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Hersteller  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
3
34701
PIN CONNECTIONS
PIN CONNECTIONS
Figure 3. Pin Connections
Table 1.
Pin Function Description
A functional description of each pin can be found in the FUNCTIONAL PIN DESCRIPTION section beginning on page 16.
Pin
Pin Name
Formal Name
Definition
1
FREQ
Oscillator Frequency
This switcher frequency selection pin can be adjusted by connecting external
resistor RF to the FREQ pin. The default switching frequency (FREQ pin left open or
tied to VDDI) is set to 300 kHz.
2
INV
Inverting Input
Buck Controller Error Amplifier inverting input.
3
VOUT
Output Voltage
Output voltage of the buck converter. Input pin of the switching regulator power
sequence control circuit.
4, 5
VIN2
Input Voltage 2
Buck regulator power input. Drain of the high-side power MOSFET.
6, 7
SW
Switch
Buck regulator switching node. This pin is connected to the inductor.
8, 9
24, 25
GND
Ground
Analog ground of the IC, thermal heatsinking.
10, 11
PGND
Power Ground
Buck regulator power ground.
12
VBD
Boost Drain
Drain of the internal boost regulator power MOSFET.
13
VBST
Boost Voltage
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 pin is 7.75V nominal.
14
BOOT
Bootstrap
Bootstrap capacitor input.
15
SDA
Serial Data
I2C bus pin. Serial data.
16
SCL
Serial Clock
I2C bus pin. Serial clock.
17
LCMP
Linear Compensation
Linear regulator compensation pin.
18
LFB
Linear Feedback
Linear regulator feedback pin.
19
LDO
Linear Regulator
Input pin of the linear regulator power sequence control circuit.
CLKSYN
1
EN2
EN1
ADDR
GND
GND
V
DD1
V
IN1
LDRV
CS
LFB
LCMP
LDO
RT
CLKSEL
RST
FREQ
V
IN2
SW
SW
GND
GND
PGND
PGND
VBD
VBST
SDA
SCL
BOOT
V
IN2
INV
V
OUT
8
9
10
11
12
13
14
15
16
3
4
5
6
7
2
32
25
24
23
22
21
20
19
18
17
30
29
28
27
26
31


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