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LTC3633AEFE-3#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LTC3633A-2/LTC3633A-3
1
3633a23fb
For more information www.linear.com/LTC3633A-2
n
3.6V to 20V Input Voltage Range
n
3A Output Current per Channel
n
Up to 95% Efficiency
n
Low Duty Cycle Operation: 5% at 2.25MHz
n
Selectable 0°/180° Phase Shift Between Channels
n
Adjustable Switching Frequency: 500kHz to 4MHz
n
External Frequency Synchronization
n
Current Mode Operation for Excellent Line and
Load Transient Response
n
0.6V Reference Allows Low Output Voltages
n
User Selectable Burst Mode
®
Operation or Forced
Continuous Operation
n
Output Voltage Tracking and Soft-Start Capability
n
Short-Circuit Protected
n
Overvoltage Input and Overtemperature Protection
n
Power Good Status Outputs
n
Available in (4mm × 5mm) QFN-28 and 28-Lead
TSSOP Packages
TYPICAL APPLICATION
DESCRIPTION
Dual Channel 3A, 20V
Monolithic Synchronous
Step-Down Regulator
The LT C
®
3633A-2 is a high efficiency, dual-channel mono-
lithic synchronous buck regulator using a controlled on-time,
current mode architecture, with phase lockable switching
frequency. The two channels can run 180° out of phase to
relax the requirements for input and output capacitance. The
operating supply voltage range is from 3.6V to 20V, making
it suitable for lithium-ion battery stacks as well as point of
load power supply applications from a 12V or 5V supply.
The operating frequency is programmable from 500kHz to
4MHz with an external resistor and may be synchronized
to an external clock signal. The high frequency capabil
-
ity allows the use of small surface mount inductors and
capacitors. The unique constant frequency/controlled on-
time architecture
is ideal for high step-down ratio applica
-
tions that operate at high frequency while demanding fast
transient response. An internal phase locked loop servos
the on-time of the internal one-shot timer to match the
frequency of the internal clock or an applied external clock.
The LTC3633A-2 can select between forced continuous
mode and high efficiency Burst Mode operation. The
LTC3633A-2 and LTC3633A-3 differ in their output volt
-
age sense range (refer to Table 1 in the Operation section
for a description of the entire LTC3633A product family).
FEATURES
APPLICATIONS
n
Distributed Power Systems
n
Battery Powered Instruments
n
Point of Load Power Supplies
Efficiency vs Load Current
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks 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.
0.001
0
EFFICIENCY (%)
10
30
40
50
70
0.1
10
3633a23 TA01b
20
80
100
90
60
0.01 1
V
OUT
= 5V
V
OUT
= 3.3V
LOAD CURRENT (A)
Burst Mode
OPERATION
V
IN
= 12V
RUN1
RUN2
TRACKSS2
PGOOD2
LTC3633A-2
BOOST2
0.1µF
1.5µH
73.2k
10k
SW2
V
ON2
PV
IN2
PGNDSGND
PV
IN1
SV
IN
V
FB2
PHMODE
TRACKSS1
PGOOD1
BOOST1
SW1
V
ON1
V
FB1
22µF
V
OUT2
5V AT 3A
0.1µF
1µH
45.3k
10k 22µF
V
OUT1
3.3V AT 3A
V
IN
6V TO 20V
47µF
x2
MODE/SYNC
RT
ITH1
ITH2
INTV
CC
2.2µF
3633a23 TA01a
LTC3633A-2/LTC3633A-3
2
3633a23fb
For more information www.linear.com/LTC3633A-2
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
PV
IN1
, PV
IN2
, SV
IN
...................................... –0.3V to 20V
PGOOD1, PGOOD2, V
ON1
, V
ON2
................. –0.3V to 18V
BOOST1, BOOST2 ...................................... –0.3V to 23V
BOOST1-SW1, BOOST2-SW2 ................... –0.3V to 3.6V
INTV
CC
, TRACKSS1, TRACKSS2 ................ –0.3V to 3.6V
ITH1, ITH2, RT, MODE/SYNC ........ –0.3V to INTV
CC
+ 0.3V
V
FB1
, V
FB2
, PHMODE. .................. –0.3V to INTV
CC
+ 0.3V
(Note 1)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3633AEUFD-2#PBF LTC3633AEUFD-2#TRPBF 633A2 28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LTC3633AIUFD-2#PBF LTC3633AIUFD-2#TRPBF 633A2 28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LTC3633AEFE-2#PBF LTC3633AEFE-2#TRPBF LTC3633AFE-2 28-Lead Plastic TSSOP –40°C to 125°C
LTC3633AIFE-2#PBF LTC3633AIFE-2#TRPBF LTC3633AFE-2 28-Lead Plastic TSSOP –40°C to 125°C
LTC3633AEUFD-3#PBF LTC3633AEUFD-3#TRPBF 633A3 28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LTC3633AIUFD-3#PBF LTC3633AIUFD-3#TRPBF 633A3 28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LTC3633AEFE-3#PBF LTC3633AEFE-3#TRPBF LTC3633AFE-3 28-Lead Plastic TSSOP –40°C to 125°C
LTC3633AIFE-3#PBF LTC3633AIFE-3#TRPBF LTC3633AFE-3 28-Lead Plastic TSSOP –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
Fo
r more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
RUN1 ............................................. –0.3V to SV
IN
+ 0.3V
RUN2 ......................................................... –0.3V to 20V
Operating Junction Temperature Range
(Notes 3, 4) ............................................ –40°C to 125°C
Storage Temperature Range ................... –65°C to 150°C
9 10
TOP VIEW
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
11 12 13
28 27 26 25 24
14
23
6
5
4
3
2
1
PGOOD1
PHMODE
RUN1
MODE/SYNC
RT
RUN2
SGND
PGOOD2
PV
IN1
PV
IN1
SV
IN
BOOST1
INTV
CC
BOOST2
PV
IN2
PV
IN2
V
FB1
TRACKSS1
ITH1
V
ON1
SW1
SW1
V
FB2
TRACKSS2
ITH2
V
ON2
SW2
SW2
7
17
18
19
20
21
22
16
8
15
29
PGND
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
FE PACKAGE
28-LEAD PLASTIC TSSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ITH1
TRACKSS1
V
FB1
PGOOD1
PHMODE
RUN1
MODE/SYNC
RT
RUN2
SGND
PGOOD2
V
FB2
TRACKSS2
ITH2
V
ON1
SW1
SW1
PV
IN1
PV
IN1
SV
IN
BOOST1
INTV
CC
BOOST2
PV
IN2
PV
IN2
SW2
SW2
V
ON2
29
PGND
T
JMAX
= 125°C, θ
JA
= 25°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
LTC3633A-2/LTC3633A-3
3
3633a23fb
For more information www.linear.com/LTC3633A-2
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
J
= 25°C (Note 2). PV
IN1
= PV
IN2
= SV
IN
=
12V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SV
IN
Supply Range
l
3.6 20 V
PV
IN1
Supply Range
PV
IN2
Supply Range
3.6V < SV
IN
< 20V
l
l
1.5
1.5
20
20
V
V
Ou
tput Voltage Range (Note 4) LTC3633A-2, V
ON
= V
OUT
LTC3633A-3, V
ON
= V
OUT
0.6
1.5
6
12
V
V
I
Q
Input DC Supply Current (PV
IN1
+ PV
IN2
+ SV
IN
)
Both Channels Active (Note 5)
Sleep Current
Shutdown
MODE = 0V
MODE = INTV
CC
, V
FB1
, V
FB2
> 0.6
RUN1 = RUN2 = 0V
1.3
500
13
mA
µA
µA
V
FB
Feedback Reference Voltage
l
0.594 0.6 0.606 V
∆V
LINE_REG
Reference Voltage Line Regulation PV
IN
= 3.6V to 20V 0.002 %/V
∆V
LOAD_REG
Output Voltage Load Regulation ITH = 0.8V to 1.6V 0.05 %
I
FB
Feedback Pin Input Current ±30 nA
g
m(EA)
Error Amplifier Transconductance ITH = 1.2V 1.8 mS
t
ON
Minimum On Time V
ON
= 0.6V, PV
IN
= 4V 20 ns
t
OFF
Minimum Off Time PV
IN
= 6V 45 ns
f
OSC
Oscillator Frequency V
RT
= INTV
CC
RT = 162k
RT = 80.6k
1.4
1.
7
3.4
2
2
4
2.6
2.3
4.6
MHz
MHz
MHz
I
LIM
Positive Valley Switch Current Limit 2.6 3.5 4.5 A
Negative Inductor Valley Current Limit –2 A
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
130
65
mΩ
mΩ
I
SW(LKG)
Switch Leakage Current PV
IN
= 20V, V
RUN
= 0V 0.01 ±1 µA
V
VIN-OV
V
IN
Overvoltage Lockout Threshold PV
IN
Rising
PV
IN
Falling
20.3
22.5
21.5
22.5
V
V
INTV
CC
Voltage 3.6V < SV
IN
< 20V, 0mA Load 3.1 3.3 3.5 V
INTV
CC
Load Regulation 0mA to 50mA Load, SV
IN
= 4V to 20V 1.3 %
RUN Threshold Rising
RUN Threshold Falling
l
l
1.18
0.98
1.2
2
1.01
1.26
1.04
V
V
RUN Leakage Current 0 ±3 µA
PGOOD Good-to-Bad Threshold V
FB
Rising
V
FB
Falling
8
–8
10
–10
%
%
PGOOD Bad-to-Good Threshold V
FB
Rising
V
FB
Falling
–3
3
–5
5
%
%
R
PGOOD
PGOOD Pull-Down Resistance 10mA Load 20 Ω
t
PGOOD
Power Good Filter Time 20 40 µs
t
SS
Internal Soft-Start Time 10% to 90% Rise Time 400 700 µs
V
FB
During Tracking TRACKSS = 0.3V 0.28 0.3 0.315 V
I
TRACKSS
TRACKSS Pull-Up Current 1.4 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

LTC3633AEFE-3#PBF

Mfr. #:
Buy LTC3633AEFE-3#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual 3A, 20Vin, 4MHz, Monolithic Synchronous Step-Down Regulator
Lifecycle:
New from this manufacturer.
Delivery:
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