mc33702 Freescale Semiconductor, Inc, mc33702 Datasheet - Page 3

• Manufacturer Part Number: mc33702
• Description: 3.0 A Switch-mode Power Supply With Linear Regulator
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
PIN FUNCTION DESCRIPTION
24, 25
10, 11
Pin
4, 5
6, 7
8, 9
12
13
14
15
16
17
18
19
20
21
22
1
2
3
Pin Name
PGND
BOOT
LCMP
LDRV
FREQ
V
GND
V
SDA
SCL
LDO
V
LFB
V
INV
V
SW
CS
OUT
BST
IN1
IN2
BD
Linear Compensation
Oscillator Frequency
Linear Feedback
Linear Regulator
Formal Name
Output Voltage
Input Voltage 2
Input Voltage 1
Inverting Input
Power Ground
Current Sense
Boost Voltage
Linear Drive
Boost Drain
Serial Clock
Serial Data
Bootstrap
Freescale Semiconductor, Inc.
Ground
Switch
For More Information On This Product,
PGND
PGND
BOOT
FREQ
V
GND
GND
V
SDA
V
V
SCL
OUT
V
INV
SW
SW
BST
IN2
IN2
BD
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1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
This selection switcher pin can be adjusted by connecting external resistor R
FREQ pin. The default switching frequency (FREQ pin left open or tied to V
to 300 kHz.
Buck Controller Error Amplifier inverting input.
Output voltage of the buck converter. Input pin of the switching regulator power
sequence control circuit.
Buck regulator power input. Drain of the high-side power MOSFET.
Buck regulator switching node. This pin is connected to the inductor.
Analog ground of the IC, thermal heatsinking.
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 V
is 8.0 V nominal.
Bootstrap capacitor input.
I
I
Linear regulator compensation pin.
Linear regulator feedback pin.
Input pin of the linear regulator power sequence control circuit.
Current sense pin of the LDO. Overcurrent protection of the linear regulator external
power MOSFET. The voltage drop over the LDO current sense resistor R
between the CS and LDO pins. The LDO current limit can be adjusted by selecting the
proper value of the current sensing resistor R
LDO gate drive of the external pass N-channel MOSFET.
The input supply pin for the integrated circuit. The internal circuits of the IC are supplied
through this pin.
2
2
C bus pin. Serial data.
C bus pin. Serial clock.
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
CLKSYN
CLKSEL
RESET
RT
EN2
EN1
ADDR
GND
GND
V
V
LDRV
CS
LDO
LFB
LCMP
DD1
IN1
Definition
S
.
S
is sensed
DDI
F
to the
BST
) is set
33702
pin
3