MC34164-3 Datasheet, PDF (3/23 Pages) Freescale Semiconductor, Inc – 3.0 A 1.0 MHz Fully Integrated DDR Switch-Mode Power Supply

PIN CONNECTIONS
PIN CONNECTIONS
24 23 22 21 20 19
GND ₁
18 ^PVIN
FREQ ₂
17 SW
NC 3
PG ⁴
Transparent
Top View
16 SW
15 SW
STBY ₅
14 PGND
SD ⁶
13 PGND
7 8 9 10 ₁₁ 12
Figure 3. 34712 Pin Connections
Table 1. 34712 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 10.
Pin Number Pin Name Pin Function Formal Name
Definition
1
GND
2
FREQ
3
NC
4
PG
5
STBY
6
SD
7
VREFIN
8
VREFOUT
9
COMP
10
INV
11
12,13,14
15,16,17
18,19,20
21
VOUT
PGND
SW
PVIN
BOOT
Ground
Passive
None
Output
Input
Input
Input
Output
Passive
Input
Output
Ground
Power
Supply
Passive
Signal Ground
Analog signal ground of IC
Frequency Adjustment Buck converter switching frequency adjustment pin
No Connect
No internal connections to this pin
Power Good
Active-low (open drain) power-good status reporting pin
Standby
Standby mode input control pin
Shutdown
Shutdown mode input control pin
Voltage-Tracking-
Reference Input
Voltage-Tracking-Reference voltage input
Reference Voltage Buffered output equal to 1/2 of voltage-tracking reference
Output
Compensation
Buck converter external compensation network pin
Error Amplifier
Inverting Input
Buck converter error amplifier inverting input pin
Output Voltage
Discharge FET
Discharge FET drain connection (connect to buck converter output
capacitors)
Power Ground
Ground return for buck converter and discharge FET
Switching Node ^{Buck converter power switching node}
Power-Circuit Supply Buck converter main supply voltage input
Input
Bootstrap
Bootstrap switching node (connect to bootstrap capacitor)
Analog Integrated Circuit Device Data
Freescale Semiconductor
34712
3