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LTC3823IUH#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LTC3823
1
3823fd
FEATURES
APPLICATIONS
DESCRIPTION
Fast No R
SENSE
TM
Step-Down
Synchronous DC/DC Controller
with Differential Output Sensing,
Tracking and PLL
The LTC
®
3823 is a synchronous step-down switching regu-
lator controller with true remote differential output sensing
and output voltage up/down tracking capability. Its advanced
functions and high accuracy reference are ideal for powering
high performance server, ASIC and computer memory
systems.
The LTC3823 uses a constant on-time, valley current
mode control architecture to deliver very low duty fac-
tors without requiring a sense resistor. The operating
frequency is selected by an external resistor and is com-
pensated for variations in input supply voltage. An internal
phase-locked loop allows the IC to be synchronized to an
external clock.
Fault protection is provided by an overvoltage compara-
tor and input undervoltage lockout. The regulator current
limit is user programmable. A wide supply range allows
voltages as high as 36V to be stepped down to as low as
a 0.6V output. When using remote sense, output voltages
up to 3.3V can be developed, and up to 90% of V
IN
without
remote sense. Power supply sequencing is accomplished
using an external soft-start timing capacitor.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
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, 5847554,
6580258, 6304066, 6476589, 6774611.
n
Wide V
IN
Range: 4.5V to 36V
n
±0.67%, 0.6V Reference Voltage
n
Output Voltage Tracking Capability
n
True Remote Sensing Differential Amplifi er
n
Sense Resistor Optional
n
True Current Mode Control
n
2% to 90% Duty Cycle at 200kHz
n
t
ON(MIN)
< 100ns
n
Phase-Locked Loop Frequency Synchronization
n
Powerful Dual N-Channel MOSFET Driver
n
Adjustable Cycle-by-Cycle Current Limit
n
Adjustable Switching Frequency
n
Programmable Soft-Start
n
Current Foldback Protection (Disabled at Start-Up)
n
Output Overvoltage Protection
n
Micropower Shutdown: 30μA
n
Power Good Output Voltage Monitor Tracks the
Reference Input Pin
n
Available in (5mm × 5mm) 32-Lead QFN and
28-Lead SSOP Narrow Packages
n
Distributed Power Systems
n
Server Power Supplies
CMDSH-3
B340A
9.5k
1.8μH
10μF
10μF
35V
s3
V
IN
5V TO 28V
V
OUT
2.5V
10A
180μF
4V
s2
Si4874
Si4884
68k
0.1μF
0.22μF
10k
1000pF
V
OUT
3k
10k
0.01μF
+
I
ON
V
IN
TG
SW
BOOST
PLLIN
RUN
I
TH
SGND INTV
CC
BG
PGND
SENSE
–
SENSE
+
V
OUTSENSE
+
V
FB
LTC3823
DRV
CC
PGOOD
V
OUTSENSE
–
V
DIFFOUT
V
ON
V
RNG
TRACK/SS
PLLFLTR
3823 TA01a
LOAD CURRENT (A)
0.1
87
EFFICIENCY (%)
POWER LOSS (W)
88
90
91
92
97
94
0.01
0.1
10
1
1
3823 TA01b
89
95
96
93
10
V
IN
= 5V
V
OUT
= 2.5V
FIGURE 12 CIRCUIT
EFFICIENCY
POWER LOSS
Effi ciency and Power Loss
vs Load Current
High Effi ciency Step-Down Converter
TYPICAL APPLICATION
LTC3823
2
3823fd
ABSOLUTE MAXIMUM RATINGS
Supply Voltages
Input Supply Voltage V
IN
,
V
INSNS
....................................................–0.3V to 36V
DRV
CC
, (BOOST – SW) ............................–0.3V to 7V
BOOST ................................................... –0.3V to 42V
SENSE
+
, SW Voltage .................................–5V to 36V
TRACK/SS, FCB, Z0, Z1/SS
ENABLE
, Z2,
PLLIN, V
OUTSENSE
+
, V
OUTSENSE
–
Voltages .................................. –0.3V to (INTV
CC
+ 0.3)V
V
ON
, V
RNG
, PGOOD Voltages .. –0.3V to (INTV
CC
+ 0.3)V
V
DIFFOUT
................................................–0.3V to INTV
CC
(Note 1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
GN PACKAGE
28-LEAD PLASTIC SSOP NARROW
28
27
26
25
24
23
22
21
20
19
18
17
16
15
FCB
RUN
V
ON
PGOOD
V
RNG
V
FB
I
TH
SGND
I
ON
V
DIFFOUT
V
OUTSENSE
+
V
OUTSENSE
–
TRACK/SS
PLLFLTR
Z0
BOOST
TG
SW
SENSE
+
SENSE
–
PGND
BG
INTV
CC
Z2
Z1/SS
ENABLE
ZV
CC
V
IN
PLLIN
T
JMAX
= 125°C, θ
JA
= 80°C/W
32 31 30 29 28 27 26 25
9 10 11 12
TOP VIEW
33
SGND
UH PACKAGE
32-LEAD
(
5mm s 5mm
)
PLASTIC QFN
13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1V
RNG
V
FB
I
TH
SGND
I
ON
V
DIFFOUT
NC
V
OUTSENSE
+
SENSE
+
SENSE
–
PGND
BG
DRV
CC
INTV
CC
Z2
Z1/SS
ENABLE
PGOOD
V
ON
RUN
FCB
Z0
BOOST
TG
SW
V
OUTSENSE
–
NC
TRACK/SS
PLLFLTR
PLLIN
V
IN
V
INSNS
ZV
CC
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
RUN, I
ON
.................................................... –0.3V to 12V
PLLFLTR, I
TH
, V
FB
Voltages ...................... –0.3V to 2.7V
INTV
CC
, ZV
CC
Voltages ................................–0.3V to 7V
TG, BG, INTV
CC
Peak Currents ....................................4A
TG, BG, INTV
CC
RMS Currents ...............................50mA
Operating Temperature Range .................–40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range ..................–65°C to 125°C
Lead Temperature (Soldering, 10 sec)
SSOP ................................................................300°C
PIN CONFIGURATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3823EGN#PBF LTC3823EGN#TRPBF LTC3823EGN 28-Lead Plastic SSOP Narrow –40°C to 85°C
LTC3823IGN#PBF LTC3823IGN#TRPBF LTC3823IGN 28-Lead Plastic SSOP Narrow –40°C to 85°C
LTC3823EUH#PBF LTC3823EUH#TRPBF 3823
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3823IUH#PBF LTC3823IUH#TRPBF 3823
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
ORDER INFORMATION
LTC3823
3
3823fd
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
I
Q
Input DC Supply Current Normal Operation
Shutdown Supply Current
1400
30
2200
50
μA
μA
V
FB
Feedback Voltage Accuracy (Note 3) I
TH
= 1.2V (0°C to 85°C)
I
TH
= 1.2V
l
0.596
0.594
0.6
0.6
0.604
0.606
V
V
V
FB(LINEREG)
Feedback Voltage Line Regulation V
IN
= 4.5V to 30V, I
TH
= 1.2V (Note 3) 0.002 %/V
V
FB(LOADREG)
Feedback Voltage Load Regulation I
TH
= 0.5V to 1.9V (Note 3) –0.04 –0.3 %
V
RUN
RUN Pin On Threshold V
RUN
Rising 1 1.5 1.9 V
I
SS/TRACK
Soft-Start Charge Current V
SS/TRACK
= 0V –1.3 –1.7 –2.3 μA
I
FB
Feedback Pin Input Current –100 –20 100 nA
g
m(EA)
Error Amplifi er Transconductance I
TH
= 1.2V (Note 3)
l
1.65 mS
V
FCB
Forced Continuous Threshold
l
0.57 0.6 0.63 V
I
FCB
Forced Continuous Pin Current V
FCB
= 0V –1 –2 μA
t
ON
On-Time I
ON
= –60μA, V
ON
= 1.5V
I
ON
= –60μA, V
ON
= 0V
210
80
250
115
290
150
ns
ns
t
ON(MIN)
Minimum On-Time I
ON
= –180μA, V
ON
= 0V 50 100 ns
t
OFF(MIN)
Minimum Off-Time 280 400 ns
V
SENSE(MAX)
Maximum Current Sense Threshold V
RNG
= 1V, V
FB
= 570mV (0°C to 85°C)
V
RNG
= 0V, V
FB
= 570mV (0°C to 85°C)
V
RNG
= INTV
CC
, V
FB
= 570mV (0°C to 85°C)
120
50
240
140
70
280
160
85
320
mV
mV
mV
V
SENSE(MIN)
Minimum Current Sense Threshold V
RNG
= 1V, V
FB
= 630mV
V
RNG
= 0V, V
FB
= 630mV
V
RNG
= INTV
CC
, V
FB
= 630mV
–60
–30
–120
mV
mV
mV
ΔV
FB(OV)
Output Overvoltage Fault Threshold Offset 8 11 14 %
V
IN(UVLO
+
)
Undervoltage Lockout V
IN
Falling 3.1 3.4 V
V
IN(UVLO
–
)
Undervoltage Lockout V
IN
Rising 3.9 4.1 V
TG R
UP
TG Driver Pull-Up On-Resistance TG High 1.9 2.5 Ω
TG R
DOWN
TG Driver Pull-Down On-Resistance TG Low 1.2 2.5 Ω
BG R
UP
BG Driver Pull-Up On-Resistance BG High 1.9 3 Ω
BG R
DOWN
BG Driver Pull-Down On-Resistance BG Low 0.7 1.5 Ω
TG t
r
TG Rise Time C
LOAD
= 3300pF 20 ns
TG t
f
TG Fall Time C
LOAD
= 3300pF 20 ns
BG t
r
BG Rise Time C
LOAD
= 3300pF 20 ns
BG t
f
BG Fall Time C
LOAD
= 3300pF 20 ns
Internal V
CC
Regulation
V
INTVCC
Internal V
CC
Voltage 6V < V
IN
< 36V
l
4.75 5 5.45 V
ΔV
LDO(LOADREG)
Internal V
CC
Load Regulation I
CC
= 0mA to 20mA –0.1 ±2 %
Phase-Locked Loop
R
PLLIN
PLLIN Input Resistance 50 kΩ
I
PLLFLTR
Phase Detector Sink Current
Phase Detector Source Current
f
PLLIN
< f
O
f
PLLIN
> f
O
–15
15
μA
μA
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 15V unless otherwise specifi ed.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LTC3823IUH#TRPBF

Mfr. #:
Buy LTC3823IUH#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Fast No Rsense Step-Down Synchronous Controller with Differential Output Sensing, Tracking and PLL
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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