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LTC1625IGN

Description
DC/DC Cntrlr Single-OUT Step Down 165kHz Automotive 16-Pin SSOP N
CategoryPower/power management    The power supply circuit   
File Size348KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC1625IGN Overview

DC/DC Cntrlr Single-OUT Step Down 165kHz Automotive 16-Pin SSOP N

LTC1625IGN Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instructionSSOP, SSOP16,.25
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Maximum input voltage36 V
Minimum input voltage3.7 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G16
JESD-609 codee0
length4.8895 mm
Humidity sensitivity level1
Number of functions1
Number of terminals16
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current2 A
Maximum output voltage36 V
Minimum output voltage1.19 V
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Encapsulate equivalent codeSSOP16,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.727 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency165 kHz
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3.899 mm
LTC1625
No R
SENSE
TM
Current Mode
Synchronous Step-Down
Switching Regulator
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTION
The LTC
®
1625 is a synchronous step-down switching
regulator controller that drives external N-Channel power
MOSFETs using few external components. Current mode
control with MOSFET V
DS
sensing eliminates the need for
a sense resistor and improves efficiency. The frequency of
a nominal 150kHz internal oscillator can be synchronized
to an external clock over a 1.5:1 frequency range.
Burst Mode
TM
operation at low load currents reduces
switching losses and low dropout operation extends oper-
ating time in battery-powered systems. A forced continu-
ous mode control pin can assist secondary winding
regulation by disabling Burst Mode operation when the
main output is lightly loaded.
Fault protection is provided by foldback current limiting
and an output overvoltage comparator. An external ca-
pacitor attached to the RUN/SS pin provides soft start
capability for supply sequencing. A wide supply range
allows operation from 3.7V (3.9V for LTC1625I) to 36V at
the input and 1.19V to V
IN
at the output.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R
SENSE
and Burst Mode are trademarks of Linear Technology Corporation.
Highest Efficiency Current Mode Controller
No Sense Resistor Required
Stable High Current Operation
Dual N-Channel MOSFET Synchronous Drive
Wide V
IN
Range: 3.7V to 36V
Wide V
OUT
Range: 1.19V to V
IN
±1%
1.19V Reference
Programmable Fixed Frequency with Injection Lock
Very Low Drop Out Operation: 99% Duty Cycle
Forced Continuous Mode Control Pin
Optional Programmable Soft Start
Pin Selectable Output Voltage
Foldback Current Limit
Output Overvoltage Protection
Logic Controlled Micropower Shutdown: I
Q
< 30µA
Available in 16-Lead Narrow SSOP and SO Packages
APPLICATIONS
s
s
s
s
Notebook and Palmtop Computers, PDAs
Cellular Telephones and Wireless Modems
Battery Chargers
Distributed Power
TYPICAL APPLICATION
Efficiency vs Load Current
SYNC
C
SS
0.1µF
RUN/SS
LTC1625
I
TH
R
C
10k
C
C
2.2nF
SW
BOOST
V
PROG
INTV
CC
SGND
BG
D
B
CMDSH-3
C
B
0.22µF
C
VCC
4.7µF
D1
MBRS140T3
M2
Si4410DY
V
IN
TK
TG
M1
Si4410DY
L1
10µH
C
IN
10µF
30V
×
2
V
IN
5V TO
28V
100
V
IN
= 10V
V
OUT
= 5V
+
+
+
V
OUT
3.3V
C
OUT
4.5A
100µF
10V
×
3
EFFICIENCY (%)
V
OSENSE
PGND
1625 F01
Figure 1. High Efficiency Step-Down Converter
U
U
U
90
V
OUT
= 3.3V
80
70
60
0.01
0.1
1
LOAD CURRENT (A)
10
1625 TA01
1
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