ISL68134_16 Datasheet, PDF (11/50 Pages) Intersil Corporation – Digital Dual Output, 7-Phase Configurable PWM

ISL68134
Electrical Specifications Recommended operating conditions, V_CC = 3.3V, unless otherwise specified. Boldface limits apply across the
operating temperature range -40°C to +85°C. (Continued)
PARAMETER
TEST CONDITIONS
MIN
MAX
(Note 7)
TYP
(Note 7) UNIT
AVS SDA, Output High Level
AVS SDA, Output Low Level
AVS CLK Frequency Range
0.8 * V_DDIO
5
V
0.2 * V_DDIO V
50
MHz
SMBus/PMBus
SALERT, SDA Output Low Level
SCL, SDA Input High/Low Threshold
I_OUT = 4mA
0.4
V
1.25
V
SCL, SDA Input Hysteresis
2
mV
SCL Frequency Range
0.05
2.00
MHz
NOTES:
6. These parts are designed and adjusted for accuracy with all errors in the voltage loop included.
7. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
Typical Performance Curves
0.08
0.07
0.06
0.05
0.04
0.03
-40
-20
0
20
40
60
80
100
AMBIENT TEMPERATURE (^oC)
FIGURE 5. NOMINAL SUPPLY CURRENT vs TEMPERATURE
0.05
0.04
0.03
0.02
0.01
0
-40
-20
0
20
40
60
80
100
AMBIENT TEMPERATURE (^oC)
FIGURE 6. SHUTDOWN SUPPLY CURRENT vs TEMPERATURE
Functional Description
Overview
The ISL68134 is a digital dual output 4-phase PWM controller that
can be programmed for a single output 4+0, dual output 3+1 or
2+2 phase operation. Operation using less than 4 phases
between 2 outputs is also supported. Existing digital multiphase
solutions utilize analog comparator based schemes (nonlinear) to
bolster the inadequate transient response common to many
digital multiphase solutions. The ISL68134 uses a linear voltage
regulation scheme to address transient loads. As a result, it is
much easier for users to configure and validate their designs when
compared with nonlinear schemes. By combining a proprietary low
noise and zero latency digital current sense scheme with cutting
edge digital design techniques, Intersil is able to meet transient
demands without resorting to nonlinear schemes. In addition, the
ISL68134 can store up to 8 user configurations in NVM and allows
the user to select the desired configuration via pin-strap (CONFIG).
The result is a system that is easy to configure and deploy.
A number of performance enhancing features are supported in
the ISL68134. These include AVSBus control, diode braking,
automatic phase dropping, DCR/resistor/smart power stage
current sense support, load line regulation and multiple
temperature sensing options.
To facilitate configuration development, the PowerNavigator™
GUI provides a step-by-step arrangement for setup and
parametric adjustment. Once a configuration has been set, the
user may employ PowerNavigator™ to monitor telemetry or use
direct PMBus interface based on the supported command set.
PWM Modulation Scheme
The ISL68134 uses Intersil's proprietary linear synthetic current
modulation scheme to improve transient performance. This is a
unique constant frequency, dual edge PWM modulation scheme
with both PWM leading and trailing edges being independently
moved to give the best response to transient loads. Current
balance is an inherent part of the regulation scheme. The
modulation scheme is capable of overlapping pulses should the
load profile demand such operation. In addition, the modulator is
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FN8817.0
September 28, 2016