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LTC1778EGN

Description
DC/DC Cntrlr Single-OUT Step Down 16-Pin SSOP N
File Size261KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Download user manual Parametric View All

LTC1778EGN Overview

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

LTC1778EGN Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
SVHCYes
SVHC Exceeds ThresholdYes
Number of Outputs1
TopologyStep Down
Output Voltage (V)0.8 to 32.4
Minimum Input Voltage (V)4
Maximum Input Voltage (V)36
Operating Supply Voltage (V)4 to 36
Maximum Supply Current (mA)2
Typical Gate Driver Pull Up Resistance (Ohm)2/3
Typical Gate Driver Pull Down Resistance (Ohm)1/2
Synchronous RectifierYes
Synchronous ClockNo
ProgrammabilityYes
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
Pin Count16
Standard Package NameSOP
Supplier PackageSSOP N
MountingSurface Mount
Package Height1.5(Max)
Package Length4.98(Max)
Package Width3.99(Max)
PCB changed16
Lead ShapeGull-wing
LTC1778/LTC1778-1
Wide Operating Range,
No R
SENSE
TM
Step-Down Controller
FEATURES
DESCRIPTIO
No Sense Resistor Required
True Current Mode Control
Optimized for High Step-Down Ratios
t
ON(MIN)
100ns
Extremely Fast Transient Response
Stable with Ceramic C
OUT
Dual N-Channel MOSFET Synchronous Drive
Power Good Output Voltage Monitor (LTC1778)
Adjustable On-Time (LTC1778-1)
Wide V
IN
Range: 4V to 36V
±1%
0.8V Voltage Reference
Adjustable Current Limit
Adjustable Switching Frequency
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Micropower Shutdown: I
Q
< 30µA
Available in a 16-Pin Narrow SSOP Package
The LTC
®
1778 is a synchronous step-down switching
regulator controller optimized for CPU power. The con-
troller uses a valley current control architecture to deliver
very low duty cycles with excellent transient response
without requiring a sense resistor. Operating frequency is
selected by an external resistor and is compensated for
variations in V
IN
.
Discontinuous mode operation provides high efficiency
operation at light loads. A forced continuous control pin
reduces noise and RF interference, and can assist second-
ary winding regulation by disabling discontinuous opera-
tion when the main output is lightly loaded.
Fault protection is provided by internal foldback current
limiting, an output overvoltage comparator and optional
short-circuit shutdown timer. Soft-start capability for sup-
ply sequencing is accomplished using an external timing
capacitor. The regulator current limit level is user program-
mable. Wide supply range allows operation from 4V to 36V
at the input and from 0.8V up to (0.9)V
IN
at the output.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R
SENSE
is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6100678, 6580258, 5847554, 6304066
APPLICATIO S
Notebook and Palmtop Computers
Distributed Power Systems
TYPICAL APPLICATIO
R
ON
1.4MΩ
C
SS
0.1µF
RUN/SS
C
C
500pF
I
TH
R
C
20k
SGND
LTC1778
INTV
CC
BG
I
ON
V
IN
TG
SW
BOOST
M1
Si4884
C
B
0.22µF
D
B
CMDSH-3
M2
Si4874
C
VCC
4.7µF
L1
1.8µH
EFFICIENCY (%)
C
IN
10µF
50V
×3
V
IN
5V TO 28V
90
+
D1
B340A
R2
30.1k
C
OUT
180µF
4V
×2
V
OUT
2.5V
10A
+
PGOOD
PGND
V
FB
R1
14k
1778 F01a
Figure 1. High Efficiency Step-Down Converter
1778fb
U
Efficiency vs Load Current
100
V
OUT
= 2.5V
V
IN
= 5V
V
IN
= 25V
80
70
60
0.01
1
0.1
LOAD CURRENT (A)
10
1778 F01b
U
U
1
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