33730_12 Datasheet, PDF (4/28 Pages) Freescale Semiconductor, Inc – Switch Mode Power Supply with Multiple Linear Regulators

PIN CONNECTIONS
PIN CONNECTIONS
HRT
1
RSTKAM
2
RSTH
3
RSTL
4
RST3
5
VREF2
6
VDDL
7
VDDH
8
VDDL_B
9
VREF1
10
REGON
11
IGN_ON
12
VCOMP
13
INV
14
FREQ
15
P1
16
32
P3
31
VIGN
30
GND
29
VDD3_B
28
VDD3
27
VKAM
26
CP
25
KA_VBAT
24
VBAT
23
VBAT
22
SW
21
SW
20
SR
19
BOOT
18
PFD
17
P2
Note: The exposed pad is electrically and thermally connected to the IC ground.
Figure 3. 33730 Pin Connections
Table 2. 33730 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 12.
Pin Number Pin Name Pin Function Formal Name
Definition
1
HRT
Analog Hardware Reset Timer ^{This pin is the hardware reset timer programmed with an external resistor.}
Output
2
RSTKAM Open Drain
VKAM Reset
This pin is an open drain reset output, monitoring the V_KAM supply to the
microprocessor.
3
RSTH
Open Drain
VDDH Reset
This pin is an open drain reset output, monitoring the V_DDH regulator.
4
RSTL
Open Drain
VDDL Reset
This pin is an open drain reset output, monitoring the V_DDL regulator.
5
RST3
Open Drain
VDD3 Reset
This pin is an open drain reset output, monitoring the V_DD3 regulator.
6
VREF2 Power Output VREF Output 2
This pin is the output of the protected supply VREF2. The pin is supplied
from the V_DDH through the protection FET.
7
VDDL Analog Input VDDL Regulator ^{This pin is the V}_DDL ^{regulator output feedback pin.}
8
VDDH
Analog/
VDDH Regulator ^{This pin is the 5.0 V output feedback pin of the buck regulator. The pin is}
Power Input
also a power input for the protected outputs VREF1,2.
9
VDDL_B
Analog VDDL Regulator Base ^{VDDL linear regulator base drive.}
Output
Drive
10
VREF1 Power Output VREF Output 1
This pin is the output of the protected supply VREF1. The pin is supplied
from the V_DDH through the protection FET.
11
REGON Logic Input Regulator Hold On ^{Regulator Hold On input pin (5.0 V logic level input).}
12
IGN_ON Open Drain
VIGN Status
This open drain output signals the status of the VIGN pin.
13
VCOMP
Analog
Compensation
This pin provides switching pre-regulator compensation, it is the output of
Output
the error amplifier.
14
INV
Analog Input Inverting Input
Inverting input of the switching regulator error amplifier.
15
FREQ Analog Input Frequency Adjustment Frequency adjustment of the switching regulator. The value of the resistor
to ground at this pin determines the oscillator frequency.
33730
4
Analog Integrated Circuit Device Data
Freescale Semiconductor