ISL9440BEVAL1Z Datasheet, PDF (1/14 Pages) Intersil Corporation – Triple PWM Step-Down Synchronous Buck Controller and One LDO

ISL9440BEVAL1Z: Triple PWM Step-Down
®
Synchronous Buck Controller and One LDO
Application Note
September 25, 2009
AN1454.0
ISL9440BEVAL1Z Evaluation Board
TABLE 1. FEATURES OF ISL944X FAMILY
The ISL9440BEVAL1Z evaluation board features the
ISL9440B. The ISL9440B is quad-output controller that
integrates three PWM synchronous buck controllers and one
low-dropout linear regulator controller. Then ISL9440B offers
programmable soft-start, independent enable functions and
integrates OV/OC/OT protection. The current mode control
architecture and internal compensation network keep
peripheral components to a minimum. The strong gate drivers
of the ISL9440B are capable of driving 20A current for
PWM1 and PWM2 and 15A for PWM3.
Table 1 shows the difference in terms of ISL944xx family
features.
PART
EARLY
NUMBER WARNING
SWITCHING
FREQUENCY
(kHz)
SOFT-STARTING
TIME
(ms)
ISL9440
ISL9440A
ISL9441
ISL9440B
ISL9440C
YES
YES
NO
YES
YES
300
1.7
600
1.7
300
1.7
300
PROGRAMMABLE
600
PROGRAMMABLE
The ISL9440BEVAL1Z is easy to set up to evaluate the
performance of the ISL9440B. Please refer to the “Electrical
Specifications” for typical performance summary.
Electrical Specifications Recommended operation conditions, unless otherwise noted. Refer to schematic and typical performance
curves.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
V_IN
V_OUT1
V_OUT2
V_OUT3
V_OUT4
PWM1 Rated Current
PWM2 Rated Current
All outputs are in regulation
15
19
23
V
4.85
5.0
5.15
V
3.25
3.32
3.4
V
11.64
12.0
12.36
V
2.47
2.50
2.58
V
V_IN = 19V, T_A = +25°C, No forced airflow, All three PWM
outputs are fully loaded
15
18
A
15
18
A
PWM3 Rated Current
12
14
A
LDO Rated Current
R7 = 0Ω, R4 is not populated
0.8
1.0
A
V_OUT1 Peak-to-Peak Ripple
V_OUT2 Peak-to-Peak Ripple
V_OUT3 Peak-to-Peak Ripple
V_IN = 23V, All three PWM outputs are fully loaded,
Oscilloscope is with full bandwidth.
83
mV_P-P
61
mV_P-P
109
mV_P-P
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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