TERMINAL CONNECTIONS
TERMINAL CONNECTIONS
FREQ
INV
V
OUT
V
IN2
V
IN2
SW
SW
GND
GND
PGND
PGND
VBD
VBST
BOOT
SDA
SCL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
CLKSYN
CLKSEL
RST
RT
EN2
EN1
ADDR
GND
GND
V
DD1
V
IN1
LDRV
CS
LDO
LFB
LCMP
Figure 3. Terminal Connections
Table 1.
Terminal Function Description
A functional description of each terminal can be found in the
section beginning
on
Terminal
1
Terminal
Name
FREQ
Formal Name
Oscillator Frequency
Definition
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.
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.
I
2
C bus terminal. Serial data.
I
2
C bus terminal. Serial clock.
Linear regulator compensation terminal.
Linear regulator feedback terminal.
Input terminal of the linear regulator power sequence control circuit.
2
3
4, 5
6, 7
8, 9
24, 25
10, 11
12
13
INV
VOUT
VIN2
SW
GND
PGND
VBD
VBST
Inverting Input
Output Voltage
Input Voltage 2
Switch
Ground
Power Ground
Boost Drain
Boost Voltage
14
15
16
17
18
19
BOOT
SDA
SCL
LCMP
LFB
LDO
Bootstrap
Serial Data
Serial Clock
Linear Compensation
Linear Feedback
Linear Regulator
34701
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
