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LTC1649IS#PBF

Description
DC/DC Cntrlr Single-OUT Step Down 325kHz 16-Pin SOIC N Tube
File Size207KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC1649IS#PBF Overview

DC/DC Cntrlr Single-OUT Step Down 325kHz 16-Pin SOIC N Tube

LTC1649IS#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
Number of Outputs1
TopologyStep Down
Output Voltage (V)1.26 to 2.5
Maximum Output Current (A)20
Maximum Switching Frequency (kHz)325
Minimum Input Voltage (V)2.7
Maximum Input Voltage (V)5
Operating Supply Voltage (V)2.7 to 5
Maximum Supply Current (mA)5
Minimum Switching Frequency (kHz)130
Typical Switching Frequency (kHz)200
Synchronous RectifierNo
Synchronous ClockNo
Control MethodPWM
ProgrammabilityNo
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeIndustrial
PackagingTube
Pin Count16
Standard Package NameSOP
Supplier PackageSOIC N
MountingSurface Mount
Package Height1.5(Max)
Package Length10.01(Max)
Package Width3.99(Max)
PCB changed16
Lead ShapeGull-wing
LTC1649
3.3V Input High Power
Step-Down Switching
Regulator Controller
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
High Power 3.3V to 1.xV-2.xV Switching Regulator
Controller: Up to 20A Output
All N-Channel External MOSFETs
Provides 5V MOSFET Gate Drive with 3.3V Input
Excellent Output Regulation:
±1%
Over Line, Load
and Temperature Variations
Constant Frequency Operation Minimizes
Inductor Size
High Efficiency: Over 90% Possible
No Low-Value Sense Resistor Needed
Available in 16-Lead SO Package
The LTC
®
1649 is a high power, high efficiency switching
regulator controller optimized for use with very low supply
voltages. It operates from 2.7V to 5V input, and provides
a regulated output voltage from 1.26V to 2.5V at up to 20A
load current. A typical 3.3V to 2.5V application features
efficiency above 90% from 1A to 10A load. The LTC1649
uses a pair of standard 5V logic-level N-channel external
MOSFETs, eliminating the need for expensive P-channel
or super-low-threshold devices.
The LTC1649 shares its internal switching architecture
with the LTC1430, and features the same
±1%
line, load
and temperature regulation characteristics. Current limit
is user-adjustable without requiring an external low-value
sense resistor. The LTC1649 uses a 200kHz switching
frequency and voltage mode control, minimizing external
component count and size. Shutdown mode drops the
quiescent current to below 10µA.
The LTC1649 is available in the 16-pin narrow SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
3.3V Input Power Supply for Low Voltage
Microprocessors and Logic
Low Input Voltage Power Supplies
High Power, Low Voltage Regulators
Local Regulation for Multiple Voltage Distributed
Power Systems
TYPICAL APPLICATIO
V
IN
3.3V
MBR0530
R
IMAX
50k
3.3V to 2.5V, 15A Converter
Q1, Q2
IRF7801
TWO IN
PARALLEL
+
1µF
C
IN
3300µF
L
EXT
*
1.2µH
V
OUT
2.5V
@15A
P
VCC1
22Ω
P
VCC2
G1
1k
I
FB
Q3
IRF7801
R1
12.4k
EFFICIENCY (%)
G2
V
CC
LTC1649
FB
I
MAX
SHDN
10µF
R
C
7.5k
C
C
0.01µF
C1
220pF
0.1µF
+
SHDN
COMP
SS
GND
V
IN
C
+
1µF
C
CP
OUT
R2
12.7k
+
C
OUT
4400µF
+
MBR0530
10µF
0.33µF
IRF7801 = INTERNATIONAL RECTIFIER
MBR0530 = MOTOROLA
*12TS-1R2HL = PANASONIC
1649 TA01
U
LTC1649 Efficiency
100
90
80
70
60
50
40
0.1
1
LOAD CURRENT (A)
10
1649 TA02
U
U
1

LTC1649IS#PBF Related Products

LTC1649IS#PBF LTC1649CS#PBF LTC1649CS#TRPBF LTC1649CS LTC1649IS#TRPBF LTC1649IS
Description DC/DC Cntrlr Single-OUT Step Down 325kHz 16-Pin SOIC N Tube DC/DC Cntrlr Single-OUT Step Down 260kHz 16-Pin SOIC N Tube DC/DC Cntrlr Single-OUT Step Down 260kHz 16-Pin SOIC N T/R DC/DC Cntrlr Single-OUT Step Down 260kHz 16-Pin SOIC N DC/DC Cntrlr Single-OUT Step Down 325kHz 16-Pin SOIC N T/R DC/DC Cntrlr Single-OUT Step Down 325kHz 16-Pin SOIC N
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Not Compliant Compliant Not Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Unconfirmed Active Unconfirmed
HTS 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01
Number of Outputs 1 1 1 1 1 1
Topology Step Down Step Down Step Down Step Down Step Down Step Down
Output Voltage (V) 1.26 to 2.5 1.26 to 2.5 1.26 to 2.5 1.26 to 2.5 1.26 to 2.5 1.26 to 2.5
Maximum Output Current (A) 20 20 20 20 20 20
Maximum Switching Frequency (kHz) 325 260 260 260 325 325
Minimum Input Voltage (V) 2.7 2.7 2.7 2.7 2.7 2.7
Maximum Input Voltage (V) 5 5 5 5 5 5
Operating Supply Voltage (V) 2.7 to 5 2.7 to 5 2.7 to 5 2.7 to 5 2.7 to 5 2.7 to 5
Maximum Supply Current (mA) 5 5 5 5 5 5
Minimum Switching Frequency (kHz) 130 140 140 140 130 130
Typical Switching Frequency (kHz) 200 200 200 200 200 200
Synchronous Rectifier No No No No No No
Synchronous Clock No No No No No No
Control Method PWM PWM PWM PWM PWM PWM
Programmability No No No No No No
Maximum Operating Temperature (°C) 85 70 70 70 85 85
Supplier Temperature Grade Industrial Commercial Commercial Commercial Industrial Industrial
Pin Count 16 16 16 16 16 16
Standard Package Name SOP SOP SOP SOP SOP SOP
Supplier Package SOIC N SOIC N SOIC N SOIC N SOIC N SOIC N
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max)
Package Length 10.01(Max) 10.01(Max) 10.01(Max) 10.01(Max) 10.01(Max) 10.01(Max)
Package Width 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max)
PCB changed 16 16 16 16 16 16
Lead Shape Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing
Packaging Tube Tube Tape and Reel - Tape and Reel -
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