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LT3992HFE#TRPBF

Description
IC REG BUCK ADJ 3A DL 38-TSSOP
Categorysemiconductor    Power management   
File Size218KB,6 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LT3992HFE#TRPBF Overview

IC REG BUCK ADJ 3A DL 38-TSSOP

LT3992HFE#TRPBF Parametric

Parameter NameAttribute value
Functionstep down
Output configurationjust
Topologystep down
Output typeAdjustable
Number of outputs2
Voltage - Input (minimum)3V
Voltage - input (maximum)60V
Voltage - Output (minimum/fixed)0.8V
Voltage - Output (maximum)57V
Current - Output3A
Frequency - Switch110kHz ~ 2.5MHz
Synchronous rectifiernone
Operating temperature-40°C ~ 150°C(TJ)
Installation typesurface mount
Package/casing38-TFSOP (0.173", 4.40mm wide) exposed pad
Supplier device packaging38-TSSOP-EP
DEMO MANUAL DC1537A
LT3992A
Monolithic Dual Tracking 3A
Step-Down Switching Regulator
DESCRIPTION
The demo circuit 1537A is a dual current mode PWM
step-down DC/DC converter featuring LT
®
3992. The demo
circuit is designed for 5V and 3.3V outputs from a 7V to
60V input. The current capability of each channel is up to 3A
when running individually and 2A when both are sourcing
the same current without special heat sinking. Individual
soft-start, current limit, comparator, input voltage for each
output as well as frequency division and synchronous
and clock output functions simplify the complex design
of dual-output power converters
Both converters are synchronized to either a common
external clock input or a resistor programmable 250kHz to
2MHz internal oscillator. At all frequencies, a 180° phase
shift between channels is maintained, reducing voltage
ripple. Programmable frequency allows optimization be-
tween efficiency and external component size. Each output
can be independently disabled using its own SHDN pin
and be placed in a low quiescent current shutdown mode.
The LT3992 data sheet gives complete description of the
device, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demo circuit 1537A.
Design files for this circuit board are available at
http://www.linear.com/demo
100
95
90
EFFICIENCY (%)
85
80
75
70
65
V
OUT1
= 5V
V
OUT2
= 3.3V
60
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
LOAD CURRENT FOR SIGNAL CHANNEL (A)
DC1537a F01
Figure 1. Single Channel Efficiency at V
IN
= 24V,
f = 300kHz
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Specifications are at T
A
= 25°C.
VALUE
7V
60V (For Transient. Continuous Operation
if D3 and D4 Are Replaced with Higher
Voltage Rated Schottky Diodes)
CONDITIONS
Output Voltage V
OUT1
Output Voltage V
OUT2
Switching Frequency
Maximum Output Current I
OUT1
Maximum Output Current I
OUT2
Voltage Ripple V
OUT1
Voltage Ripple V
OUT2
V
IN
= 7~ 60V
V
IN
= 7~ 60V
V
IN
= 7~ 60V
V
IN
= 7~ 60V
V
IN
= 12V, I
OUT1
= 3A
V
IN
= 12V, I
OUT2
= 3A
5.0V ±3%
3.3V ±3%
300kHz ±10%
3A Individually, 2A Both Running
3A Individually, 2A Both Running
<20mV
<20mV
dc1537af
1
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