LSN2-T/30-D12 Series
DOSA-SIP, 30A POL DC/DC Converters
MDC_LSN2-T/30-D12 Series.C01Δ Page 1 of 16
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FEATURES
■
Standard (DOSA compatible) SIP package
■
User-selectable outputs: 0.8 to 5Vdc
■
30 Amps maximum output current
■
Meets RoHS-6 standards
■
Selectable phased start-up sequencing,
tracking and pre-bias operation
■
Wide range input voltages 6 to 14Vdc
■
To 150W with overtemperature shutdown
■
Very high effi ciency up to 94%
■
Fast settling, high di/dt IOUT slew rate
■
Meets UL 60950-1, CAN/CSA-C22.2 60950-
1, IEC 60950-1, EN60950-1 safety approvals,
2nd edition
■
Extensive self-protection with short circuit
“hiccup” shutdown
■
Output overvoltage/overcurrent protection
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Input under and overvoltage shutdown
Figure 1. LSN2 -T/30-D12 Series Simplifi ed Schematic
Typical topology is shown.
+INPUT
COMMON
V
TRACK
/SEQUENCE
INPUT
PWM
CONTROLLER
CURRENT
SENSE
REFERENCE &
ERROR AMP
VCC
ON/OFF
CONTROL
V
OUT
TRIM
POWER
GOOD
OUTPUT
+OUTPUT
10.57
+SENSE
COMMON
➀
➀ Only one phase of two is shown.
DESCRIPTION
These miniature point-of-load (POL) switching
DC/DCs are an ideal regulation and supply ele-
ment for mixed voltage systems. The converter
is fully compatible with the Distributed-power
OpenStandards Alliance specifi cation
(www.dosapower.com). LSN2-T/30-D12 can
power CPU’s, programmable logic and mixed
voltage systems with little heat and low noise.
A typical application uses a master isolated
12V DC supply and the LSN2-T/30-D12 con-
verter for local 1.8V and 3.3V DC supplies.
All system isolation resides in the central
supply, leaving lower cost POL regulation
right at the load. Unlike linear regulators, the
LSN2-T/30-D12 can deliver very high power
(up to 150W) in a tiny area with no heat sink-
ing and no external components needed. The
converter features quick transient response
(to 25µsec) and very fast current slew rates
(to 20A/µsec).
LSN2-T/30-D12 is an open-frame SIP
using advanced surface mount (SMT)
assembly and test techniques. The extraor-
dinary performance is achieved with a fully
synchronous fi xed-frequency buck topology
delivering high effi ciency, tight line/load
regulation, stable no-load operation and no
output reverse conduction.
Output voltage, selected with an
external programming resistor or DC volt-
age into the trim pin, means OEM’s can
stock one model for multiple applications.
Also included are protection for out-of-
limit voltages, currents and temperature.
Other functions: a remote On/Off control,
optional Power Good output, a phased
start-up sequence and tracking system,
and a load Sense input.
Typical unit
Contents Page
Description, Photograph, Connection Diagram 1
Ordering Guide,
Model Numbering, Soldering Guidelines 2
Mechanical Specs, Input/Output Pinout 3
Detailed Electrical Specifi cations 4
Technical Notes 5
Performance Data 13
