ZSPM1025A
True Digital PWM Controller (Single-Phase, Single-Rail)
2
Product Summary
2.1. Overview
The ZSPM1025A is a flexible true-digital single-phase PWM controller optimally configured for use with the
Murata Power Solutions 25A Power Block OKLP-X/25 in smart digital power solutions. It offers a PMBus™-
configurable digital power control loop, incorporating output voltage sensing and average inductor current
sensing, bundled with extensive fault monitoring and handling options.
Several different functional units are integrated in the device. A dedicated digital control loop is used to provide
fast loop response and optimal output voltage regulation. This includes output voltage sensing, average inductor
current sensing, a digital control law, and a digital pulse-width modulator (DPWM). In parallel, a dedicated,
configurable error handler allows for fast and flexible detection of error signals and their appropriate handling. A
housekeeping analog-to-digital converter (HKADC) ensures the reliable and efficient measurement of
environmental signals, such as input voltage and temperature. An application-specific, low-energy integrated
microcontroller is used to control the overall system. Among other things, it manages configuration of the various
logic units and handles the PMBus™ communication protocol. A PMBus™/SMBus/I²C™ interface is incorporated
to connect with the outside world; supported by control and power-good signals.
Figure 2.1
Typical Application Circuit with a 5V Supply Voltage
+5V
VDD50
VDD33
VDD18
C1,C2,C3
Vin
+5V
GND
AVDD18
VREFP
R7
R8
VIN
+5V ENABLE
R1
ADCVREF
AGND
C4,C5,C6
+Vout
VIN
VOUT
GND
Murata
OKLP-X/25-W12-C
PWM
LSE
PWM
COUT
CIN
ADDR0
ADDR1
GND
PGND
TEMP +CS -CS
R2,R3
TEMP
SCL
C8
PMBus™
Interface
SDA
ISNSP
ISNSN
R6
SMBALERT
GPIO0
R5
CONTROL
PGOOD
VFBP
VFBN
R4
C7
ZSPM1025A
© 2013 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.
Data Sheet
October 24, 2013
12 of 46
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