ZL2106ALCF Datasheet, PDF (10/29 Pages) Intersil Corporation – 6A Digital-DC Synchronous Step-Down DC/DC Converter

ZL2106
ZL2106 Overview
Digital-DC Architecture
The ZL2106 is an innovative mixed-signal power conversion and
power management IC based on Zilker Labs patented Digital-DC
technology that provides an integrated, high performance
step-down converter for point of load applications. The ZL2106
integrates all necessary PWM control circuitry as well as low
r_DS(ON) synchronous power MOSFETs to provide an extremely
small solution for supplying load currents up to 6A.
The ZL2106 can be configured by simply connecting its pins
according to the tables provided in the following sections.
Additionally, a comprehensive set of application notes are
available to help simplify the design process. An evaluation
board is also available to help the user become familiar with the
device. This board can be evaluated as a standalone platform
using pin configuration settings. A Windows™-based GUI is also
provided to enable full configuration and monitoring capability
via the I²C/SMBus interface using an available computer and the
included USB cable.
Its unique PWM loop utilizes an ideal mix of analog and digital
blocks to enable precise control of the entire power conversion
process with no software required, resulting in a very flexible
device that is also very easy to use. An extensive set of power
management functions are fully integrated and can be
configured using simple pin connections. The user configuration
can be saved in an internal non-volatile memory (NVM).
Additionally, all functions can be configured and monitored via
the SMBus hardware interface using standard PMBus
commands, allowing ultimate flexibility.
Once enabled, the ZL2106 is immediately ready to regulate
power and perform power management tasks with no
programming required. Advanced configuration options and
real-time configuration changes are available via the I²C/SMBus
interface if desired and continuous monitoring of multiple
operating parameters is possible with minimal interaction from a
host controller. Integrated sub-regulation circuitry enables single
supply operation from any external supply between 4.5V and 14V
with no secondary bias supplies needed. The ZL2106 can also be
configured to operate from a 3.3V or 5V standby supply when the
main power rail is not present, allowing the user to configure
and/or read diagnostic information from the device when the
main power has been interrupted or is disabled.
Power Conversion Overview
The ZL2106 operates as a voltage-mode, synchronous buck
converter with a selectable constant frequency pulse width
modulator (PWM) control scheme. The ZL2106 integrates dual low
r_DS(ON) synchronous MOSFETs to minimize the circuit footprint.
Figure 10 illustrates the basic synchronous buck converter
topology showing the primary power train components. This
converter is also called a step-down converter, as the output
voltage must always be lower than the input voltage.
VIN
DB
LDO
QH
PWM
QL
CIN
CB
L1
ZL
V_OUT
COUT
FIGURE 10. SYNCHRONOUS BUCK CONVERTER
>
INPUT VOLTAGE BUS
>
VTRK
FC
SYNC
DDC
SALRT
SDA
SCL
SA
PG EN MGN CFG SS VSET
POWER MANAGEMENT NVM
I_SENSE
LDO
DDIIGGIITTAALL
CCOOMMPPEENNSSAATTOORR
D-PWM
HS FET
DRIVER
SYNC
GEN
PLL
RESET REF
ADC
ADC
LS FET
DRIVER
Σ^-
+
I_SENSE
COMMUNICATION
ADC
MUX
VDD
TEMP
SENSOR
FIGURE 11. ZL2106 BLOCK DIAGRAM
10
BST
SW
VSEN
V_OUT
FN6852.6
February 20, 2013