LTC1709EG Linear Technology, LTC1709EG Datasheet - Page 28

• Manufacturer Part Number: LTC1709EG
• Description: IC REG SW 2PH SYNC STPDWN 36SSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1709EG

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 1.3 ~ 3.5 V
• Current - Output: 3A
• Voltage - Input: 4 ~ 36 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Frequency - Switching: -

LTC1709
TYPICAL APPLICATIO
RELATED PARTS
PART NUMBER
LTC1438/LTC1439
LTC1438-ADJ
LTC1538-AUX
LTC1539
LTC1436A-PLL
LTC1628/LTC1628-PG Dual High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
LTC1629/LTC1629-PG PolyPhase High Efficiency Controller
LTC1929
LTC1702/LTC1703
LTC1709-7/
LTC1709-8/
LTC1709-9
LTC1708-PG
LTC1735
LTC1736
Adaptive Power and Burst Mode are trademarks of Linear Technology Corporation.
28
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone] www.linear-tech.com
100pF
47k
15k
0.1 F
INTV
3.3nF
DESCRIPTION
Dual High Efficiency Low Noise Synchronous Step-Down Switching Regulators POR, Auxiliary Regulator
Dual Synchronous Controller with Auxiliary Regulator
Dual High Efficiency Low Noise Synchronous Step-Down Switching Regulator
Dual High Efficiency Low Noise Synchronous Step-Down Switching Regulator
High Efficiency Low Noise Synchronous Step-Down Switching Regulator
2-Phase High Efficiency Controller
Dual High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator with
5-Bit VID and Power Good Indication
Dual High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
with 5-Bit VID and Power Good Indication
High Efficiency Synchronous Step-Down Controller
High Efficiency Synchronous Step-Down Controller with 5-Bit VID
CC
470pF
Figure 12. 5V Input, 1.8V/20A Power Supply with Active Voltage Positioning
10k
51k
1000pF
SWITCHING FREQUENCY = 310kHz
MI – M4: FAIRCHILD FDS7760A
L1 – L2: SUMIDA CEP125-1R5M
1000pF
2.7k
U
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
RUN/SS
SENSE 1
SENSE 1
EAIN
PLLFLTR
PLLIN
NC
I
SGND
V
V
V
SENSE 2
SENSE 2
ATTENOUT
ATTENIN
VID0
VID1
TH
DIFFOUT
OS
OS
–
+
LTC1709
+
–
–
+
BOOST 1
BOOST 2
AMPMD
EXTV
INTV
PGND
V
SW1
SW2
VID4
VID3
VID2
BG1
BG2
BIAS
TG1
TG2
V
NC
CC
CC
IN
VID INPUTS
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
C
D3, D4: CENTRAL CMDSH-3TR
OUT
OUTPUT CAPACITORS: PANASONIC EEFUE0G181R
D4
0.22 F
0.1 F
0.22 F
1 F,25V
10
D3
4.7 F
6.3V
0.1 F
10
M1
M3
1.5 H
1.5 H
L1
L2
1.3V V
COMMENTS
POR, External Feedback Divider
Auxiliary Regulator, 5V Standby
5V Standby, POR, Low-Battery, Aux Regulator
Adaptive Power
Constant Frequency, Standby, 5V and 3.3V LDOs
Expandable Up to 12 Phases, G-28, Up to 120A
Adjustable Output Up to 40A, G-28
500kHz, 25MHz GBW
1.3V V
1.1V V
Current Mode Ensures Accurate Current Sharing,
3.5V V
Accurate Current Sharing, 3.5V V
Burst Mode
Fault Protection, 3.5V V
Output Fault Protection, Power Good, GN-24,
3.5V V
47 F 2
35V
0.004
0.004
M2
M4
OUT
OUT
IN
OUT
IN
TM
GND
36V
36V, 0.925V V
LINEAR TECHNOLOGY CORPORATION 1999
Operation, 16-Pin Narrow SSOP,
3.5V (LTC1709-8),
1.85V (LTC1709-9),
3.5V, Current Mode Ensures
D1
MBRM
140T3
D2
MBRM
140T3
TM
1709f LT/TP 0500 4K • PRINTED IN USA
C
Mode, 24-Pin SSOP
OUT
IN
4 180 F
4V
1709 TA02
V
5V TO 28V
V
1.3V TO 3.5V
IN
OUT
OUT
36V
IN
2V
36V