LTM4712
TYPICAL PERFORMANCE CHARACTERISTICS
Short-Circuit with 5VIN to 12VOUT
,
Short-Circuit with 12VIN to 12VOUT
,
Short-Circuit with 36VIN to 12VOUT
,
No Load
No Load
No Load
ꢀ
ꢀ
ꢀ
ꢀꢁ
ꢂꢃꢄꢅꢀꢆ
ꢀꢁ
ꢀꢁ
ꢂꢃꢄꢅꢀꢆ
ꢂꢃꢄꢅꢀꢆ
ꢀ
ꢀ
ꢀ
ꢁꢂꢃ
ꢄꢀꢅꢆꢇꢀ
ꢁꢂꢃ
ꢁꢂꢃ
ꢄꢀꢅꢆꢇꢀ
ꢄꢀꢅꢆꢇꢀ
ꢀꢁꢂꢃ ꢄꢂꢅ
ꢀꢁꢂꢃ ꢄꢂꢁ
ꢀꢁꢂꢃ ꢄꢂꢅ
200μs/DIV
200μs/DIV
200μs/DIV
ꢀ
ꢃ ꢄ00ꢅꢆꢇ
ꢀ
ꢃ ꢄ00ꢅꢆꢇ
ꢀ
ꢃ ꢄ00ꢅꢆꢇ
ꢁꢂ
ꢁꢂ
ꢁꢂ
PIN FUNCTIONS
GND (Pins A1-G1, A2-G2, C3-M3, C4-M4, C5-J5, M5,
E6-M6, E7-M7, C8-J8, M8, C9-M9, C10-M10, C11-G11,
A12-G12): Tie these GND pins to a local ground plane
below the LTM4712 and the circuit components. In most
applications, the bulk of the heat flow out of the LTM4712
is through these pads, so the printed circuit design has a
large impact on the thermal performance of the part. See
the PCB Layout and Thermal Considerations and Output
Current Derating sections for more details.
FREQ (Pin A7): Frequency Set Pin. A resistor between
this pin and SGND sets the switching frequency. This pin
sources 10μA current.
PGOOD (Pin A8): Power Good Indicator Output for
the Regulated Output Voltage. Open-drain logic out is
pulled down to ground when the regulated output volt-
age exceeds 10% regulation window with the internal
30μs delay.
PHMODE (Pin A9): Phase Mode Program Pin. This pin
sets the phase relationship between the internal oscilla-
tor clock and the output clock on the CLKOUT pin. Tying
this pin to SGND sets 180° phase shift, floating this pin
ISP, ISN (Pins A3, A4): Average Current Sensing Pins. The
positive/negative inputs of the internal rail-to-rail average
current sense amplifier.
IMON (Pin A5): Input or Output Current Monitor. This
feature is generally useful only if a current sense resis-
tor is placed on input or output. ISP needs to be con-
nected to the positive side, while ISN on the negative
side. This pin produces a voltage that is proportional to
the voltage across the sense resistor. IMON will equal 1.2V
sets 120° phase shift and tying this pin to INTV sets
CC
90°phase shift. See the Applications Information section
for details.
MODE (Pin A10): Forced Continuous Mode (FCM) and
Pulse-Skipping Mode. Tying this pin to GND enables
FCM operation, otherwise the controller works in the
pulse-skipping mode when MODE pin is floated. Do not
tie to INTVCC or other voltage source. See the Applications
Information section for details.
when V – V = 50mV.
ISP
ISN
CLKOUT (Pin A6): Clock Output. Use this pin as a clock
source when synchronizing other devices to the switch-
ing frequency of the LTM4712. When this function is not
used, leave this pin open. See the Applications Information
section for detailed parallel configuration.
SS (Pin A11): Soft-Start. Connect a capacitor from this
pin to GND to increase the soft-start time. Soft-start
reduces the input power source’s surge current by gradu-
ally increasing the controller’s current limit. Larger values
of the soft-start capacitor result in longer soft-start times.
See the Applications Information section.
Rev. 0
6
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