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LTC3778EF Datasheet

  • LTC3778EF

  • Wide Operating Range, No RSENSE Step-Down Controller

  • 300.89KB

  • 24頁

  • LINER

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LTC3778
Wide Operating Range,
No R
SENSE
TM
Step-Down Controller
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Wide V
IN
Range: 4V to 36V
Sense Resistor Optional
True Current Mode Control
2% to 90% Duty Cycle at 200kHz
t
ON(MIN)
鈮?/div>
100ns
Stable with Ceramic C
OUT
Dual N-Channel MOSFET Synchronous Drive
Power Good Output Voltage Monitor
鹵1%
0.6V Reference
Adjustable Current Limit
Adjustable Switching Frequency
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Micropower Shutdown: I
Q
鈮?/div>
30碌A(chǔ)
Available in a 1mm 20-Lead TSSOP Package
The LTC
廬
3778 is a synchronous step-down switching
regulator controller for computer memory, automobile
and other DC/DC power supplies. The controller uses a
valley current control architecture to deliver very low duty
cycles without requiring a sense resistor. Operating fre-
quency is selected by an external resistor and is compen-
sated for variations in V
IN
and V
OUT
.
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 when the main output is lightly
loaded. SENSE
+
and SENSE
鈥?/div>
pins provide true Kelvin
sensing across the optional sense resistor or the
sychronous MOSFET.
Fault protection is provided by internal foldback current
limiting, an output overvoltage comparator, optional short-
circuit shutdown timer and input undervoltage lockout.
Soft-start capability for supply sequencing is accom-
plished using an external timing capacitor. The regulator
current limit level is user programmable. Wide supply
range allows operation from 4V to 36V at the input and
from 0.6V 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.
APPLICATIO S
s
s
s
s
s
Notebook and Palmtop Computers, PDAs
Battery Chargers
Distributed Power Systems
DDR Memory Power Supply
Automobile DC Power Supply
TYPICAL APPLICATIO
C
SS
0.1碌F
RUN/SS
C
C
500pF
I
TH
R
C
20k
SGND
LTC3778
INTV
CC
DRV
CC
BG
SENSE
+
SENSE
鈥?/div>
PGOOD
PGND
V
FB
I
ON
V
IN
TG
SW
BOOST
R
ON
1.4M
V
IN
5V TO 28V
M1
Si4884
C
B
0.22碌F
D
B
CMDSH-3
M2
Si4874
L1
1.8碌H
EFFICIENCY (%)
+
D1
B340A
R2
40.2k
C
IN
10碌F
35V
V
OUT
脳3
2.5V
C
OUT
10A
180碌F
4V
脳2
100
V
IN
= 5V
90
V
IN
= 25V
80
+
C
VCC
4.7碌F
70
60
0.01
R1
12.7k
3778 F01a
Figure 1. High Efficiency Step-Down Converter
3778f
U
Efficiency vs Load Current
1
0.1
LOAD CURRENT (A)
10
3778 F01b
U
U
1

LTC3778EF 產(chǎn)品屬性

  • LTC3778

  • 74

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • -

  • -

  • 4 V ~ 36 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • -40°C ~ 85°C

  • 20-TSSOP（0.173"，4.40mm 寬）

  • 管件

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