ZSPM4012KIT ZMDI, ZSPM4012KIT Datasheet - Page 17

• Manufacturer Part Number: ZSPM4012KIT
• Description: Power Management IC Development Tools DC-DC Converter Kit
• Manufacturer: ZMDI
• Type: DC/DC Converters, Regulators & Controllersr

Specifications of ZSPM4012KIT

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: ZSPM4012
• Input Voltage: 6 V to 24 V
• Output Voltage: 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V, 0.9 V to 5 V
• Output Current: 2 A

5.2.
Table 5.1: Pin Description, 16 Lead, 3x3 QFN
5.3.
5.3.1.
This terminal is the unregulated input voltage source for the IC. It is recommended that a 10uF bypass capacitor
be placed close to the device for best performance. Since this is the main supply for the IC, good layout practices
need to be followed for this connection.
5.3.2.
This terminal will provide the bootstrap voltage required for the upper internal NMOS switch of the buck regulator.
An external ceramic capacitor placed between the BST input terminal and the VSW pin will provide the necessary
voltage for the upper switch. In normal operation the capacitor is re-charged on every low side synchronous
switching action. In the case of where the switch mode approaches 100% duty cycle for the high side FET, the
device will automatically reduce the duty cycle switch to a minimum off time on every 8
capacitor to re-charge.
5.3.3.
This is the input terminal for the output voltage feedback. For the fixed-mode versions, this should be connected
directly to V
possible to the capacitor. The trace should not be shared with any other connection.
Data Sheet
January 23, 2012
PGND
PGND
Name
ZSPM4012
High Efficiency 2A Synchronous Buck Converter
VSW
VSW
VSW
VSW
VCC
VCC
GND
VCC
BST
NC
NC
PG
EN
FB
Pin Description for 16 LEAD 3x3 QFN
Detailed Pin Description
Unregulated Input, VCC (Pins # 2,3)
Bootstrap Control, BST (Pin #10)
Sense Feedback, FB (Pin #5)
OUT
Pin #
. The connection on the PCB should be kept as short as possible, and should be made as close as
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
Switching Voltage Node
Switching Voltage Node
Switching Voltage Node
Switching Voltage Node
Bootstrap Capacitor
Feedback Input
Input Voltage
Input Voltage
Input Voltage
Enable Input
No Connect
No Connect
Power GND
Power GND
PG Output
Function
GND
Regulator FB Voltage. Connects to V
Primary ground for the majority of the device except the
GND supply for internal low-side FET/integrated diode
GND supply for internal low-side FET/integrated diode
Bootstrap capacitor for the high-side FET gate driver.
and the output resistor divider for adjustable mode.
Above 2.2V the device is enabled. GND the pin to
22nF ceramic capacitor from BST pin to VSW pin
disable the device. Includes internal pull-up.
Connected to 4.7uH (typical) inductor
Connected to 4.7uH (typical) inductor
Connected to 4.7uH (typical) inductor
Connected to 4.7uH (typical) inductor
low-side power FET.
Open-drain output.
Not Connected
Not Connected
Input Voltage
Input voltage
Input voltage
Description
OUT
th
for fixed-mode
cycle to allow this
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