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ZL9101M Datasheet(PDF) 9 Page - Intersil Corporation

Part No. ZL9101M
Description  Digital DC/DC PMBus 12A Module
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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ZL9101M Datasheet(HTML) 9 Page - Intersil Corporation

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ZL9101M
9
FN7669.1
January 26, 2011
Functional Description
Output Voltage Selection
The output voltage may be set to a voltage between 0.6V and
4.0V provided that the input voltage is higher than the desired
output voltage by an amount sufficient to prevent the device
from exceeding its maximum duty cycle specification.
The VSET pin is used to set the output voltage to levels as shown
in Table 1. The RSET resistor is placed between the VSET pin and
SGND.
The output voltage may also be set to any value between 0.6V and 4.0V
using a PMBus command over the I2C/SMBus interface. See
Application Note AN2033 for details.
Soft-start Delay and Ramp Times
It may be necessary to set a delay from when an enable signal is
received until the output voltage starts to ramp to its target
value. In addition, the designer may wish to precisely set the time
required for VOUT to ramp to its target value after the delay
period has expired. These features may be used as part of an
overall inrush current management strategy or to precisely
control how fast a load IC is turned on. The ZL9101M gives the
system designer several options for precisely and independently
controlling both the delay and ramp time periods.
The soft-start delay period begins when the EN pin is asserted
and ends when the delay time expires.
The soft-start delay and ramp times are set to custom values via the
I2C/SMBus interface. When the delay time is set to 0ms, the device will
begin its ramp-up after the internal circuitry has initialized
(approximately 2ms). When the soft-start ramp period is set to 0ms, the
output will ramp up as quickly as the output load capacitance and loop
settings will allow. It is generally recommended to set the soft-start
ramp to a value greater than 500µs to prevent inadvertent fault
conditions due to excessive inrush current.
Power Good
The ZL9101M provides a Power Good (PG) signal that indicates
the output voltage is within a specified tolerance of its target
level and no fault condition exists. By default, the PG pin will
assert if the output is within 10% of the target voltage. These
limits and the polarity of the pin may be changed via the
I2C/SMBus interface. See Application Note AN2033 for details.
A PG delay period is defined as the time from when all conditions
within the ZL9101M for asserting PG are met to when the PG pin
is actually asserted. This feature is commonly used instead of
using an external reset controller to control external digital logic.
By default, the ZL9101M PG delay is set equal to the soft-start
ramp time setting. Therefore, if the soft-start ramp time is set to
10ms, the PG delay will be set to 10ms. The PG delay may be set
independently of the soft-start ramp using the I2C/SMBus as
described in Application Note AN2033.
Switching Frequency and PLL
The ZL9101M incorporates an internal phase-locked loop (PLL) to
clock the internal circuitry. The PLL can be driven by an external
clock source connected to the SYNC pin. When using the internal
oscillator, the SYNC pin can be configured as a clock source.
The internal switching frequency of the ZL9101M is 615kHz.
Loop Compensation
The ZL9101M operates as a voltage-mode synchronous buck
controller with a fixed frequency PWM scheme. The module is
internally compensated via the I2C/SMBus interface. Please
refer to Application Note AN2033 for further details.
TABLE 1. OUTPUT VOLTAGE RESISTOR SETTINGS
VOUT
(V)
RSET
(kΩ)
0.60
10
0.65
11
0.70
12.1
0.75
13.3
0.80
14.7
0.85
16.2
0.90
17.8
0.95
19.6
1.00
21.5
1.05
23.7
1.10
26.1
1.15
28.7
1.20
31.6
1.25
34.8
1.30
38.3
1.40
42.2
1.50
46.4
1.60
51.1
1.70
56.2
1.80
61.9
1.90
68.1
2.00
75
2.10
82.5
2.20
90.9
2.30
100
2.50
110
2.80
121
3.00
133
3.30
147
4.00
162


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