LTC3831 LINER [Linear Technology], LTC3831 Datasheet
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LTC3831
Manufacturer Part Number
LTC3831
Description
High Power Synchronous Switching Regulator Controller for DDR Memory Termination
Manufacturer
LINER [Linear Technology]
Datasheet
1.LTC3831.pdf
(20 pages)
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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
+
High Power Switching Regulator Controller
for DDR Memory Termination
V
No Current Sense Resistor Required
Low Input Supply Voltage Range: 3V to 8V
Maximum Duty Cycle > 91% Over Temperature
Drives All N-Channel External MOSFETs
High Efficiency: Over 95% Possible
Programmable Fixed Frequency Operation:
External Clock Synchronization Operation
Programmable Soft-Start
Low Shutdown Current: <10 A
Overtemperature Protection
Available in 16-Pin Narrow SSOP Package
DDR SDRAM Termination
SSTL_2 Interface
SSTL_3 Interface
OUT
4.7 F
C1
33pF
100kHz to 500kHz
0.1 F
Tracks 1/2 of V
1 F
SHDN
R
15k
C
C
1500pF
0.01 F
130k
C
Figure 1. Typical DDR Memory Termination Application
V
SS
FREQSET
SHDN
COMP
PV
CC
U
CC2
LTC3831
5V
R
IN
–
PV
PGND
or External V
I
GND
CC1
MAX
I
BG
TG
R
FB
FB
MBR0530T1
+
U
10k
C
C
Q1, Q2: SILICONIX Si4410DY
IN
OUT
REF
: SANYO POSCAP 6TPB330M
: SANYO POSCAP 4TPB470M
1k
0.1 F
0.1 F
V
2.5V
DDQ
Q2
Q1
MBRS340T3
MBRS340T3
1.2 H
DESCRIPTIO
L
The LTC
regulator controller designed for DDR memory termina-
tion. The LTC3831 generates an output voltage equal to
1/2 of an external supply or reference voltage. The LTC3831
uses a synchronous switching architecture with N-chan-
nel MOSFETs. Additionally, the chip senses output cur-
rent through the drain-source resistance of the upper
N-channel FET, providing an adjustable current limit
without a current sense resistor.
The LTC3831 operates with input supply voltage as low as
3V and with a maximum duty cycle of > 91%. It includes a
fixed frequency PWM oscillator for low output ripple
operation. The 200kHz free-running clock frequency can
be externally adjusted or synchronized with an external
signal from 100kHz to above 500kHz. In shutdown mode,
the LTC3831 supply current drops to <10 A.
O
Switching Regulator Controller
, LTC and LT are registered trademarks of Linear Technology Corporation.
for DDR Memory Termination
+
C
470 F
®
OUT
3
3831 is a high power, high efficiency switching
+
High Power Synchronous
3831 F01
C
330 F
V
1.25V
IN
2
TT
6A
U
100
90
80
70
60
50
40
30
20
10
0
0
T
V
V
Efficiency vs Load Current
A
IN
OUT
= 25 C
= 2.5V
1
= 1.25V
LOAD CURRENT (A)
2
LTC3831
3
4
5
2831 G01
1
3831f
6