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LTM4651 Datenblatt(PDF) 12 Page - Linear Technology

Teilenummer LTM4651
Bauteilbeschribung  EN55022B Compliant 58V, 24W Inverting-Output DC/DC 關Module Regulator
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTM4651 Datenblatt(HTML) 12 Page - Linear Technology

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LTM4651
12
4651f
For more information www.linear.com/LTM4651
Power Module Description
The LTM4651 is a non-isolated switch mode DC/DC
power supply. It can provide up to 4A output current
with a few external input and output capacitors. Set by a
single resistor, RSET, the LTM4651 regulates a negative
output voltage, VOUT–. VOUT– can be set to as low as
–26.5V to as high as –0.5V. The LTM4651 operates from
a positive input supply rail, VIN, between 3.6V and 58V.
The LTM4651’s safe operating area is defined by: VIN +
|VOUT–| ≤ 58V. The typical application schematic is shown
in Figure 32. The output current capability of the LTM4651
is dependent on VIN and VOUT, as indicated in the page 1
graph. Though the LTM4651 is a ground-referred buck
converter topology—also known as a two-switch buck-
boost converter—it contains built-in level-shift circuitry
so that the RUN, CLKIN, and PGOOD pins are conveniently
referred to GND (not VOUT–).
The LTM4651 contains an integrated constant-frequency
current mode regulator, power MOSFETs, power inductor,
EMI filter and other supporting discrete components. The
nominal switching frequency range is from 400kHz to
3MHz, and the default operating frequency is 400kHz. It
can be externally synchronized to a clock, from 250kHz to
3MHz. See the Applications Information section.
The LTM4651 supports internal and external control loop
compensation. Internal loop compensation is selected by
connecting the COMPa and COMPb pins. Using internal
loop compensation, the LTM4651 has sufficient stability
OPERATION
margins and good transient performance with a wide
range of output capacitors, even ceramic-only output
capacitors. For external loop compensation, see the Ap-
plications Information section. LTpowerCAD® is available
for transient load step and stability analysis.
Input filter and noise cancellation circuitry reduces noise-
coupling to the module’s inputs and outputs, ensuring the
module’s electromagnetic interference (EMI) meets the
limits of EN55022 Class B (see Figures 5 to 8).
Pulling the RUN pin below 1.2V forces the LTM4651 into
a shutdown state. A capacitor can be applied from ISETa
to SVOUT– to program the output voltage ramp-rate; or,
the default LTM4651 ramp-rate can be set by connecting
ISETa to ISETb; or, voltage tracking can be implemented
by interfacing rail voltages to the ISETa pin. See the Ap-
plication Information section.
Multiphase operation can be employed by applying an
external clock source to the LTM4651’s synchronization
input, the CLKIN pin. See the Typical Applications section.
LDO losses within the module are reduced by connecting
EXTVCC to PGND through an RC-filter or by connecting
EXTVCC to a suitable voltage source.
The LTM4651 also features a spare control pin called
VINREG which can be used to reduce the input current
draw during input line sag (“brownout”) conditions. Con-
nect VINREG to INTVCC when this feature is not needed.


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