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LTC3569EFE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LTC3569
1
3569fe
For more information www.linear.com/LTC3569
Typical applicaTion
FeaTures
applicaTions
DescripTion
Triple Buck Regulator with
1.2A and Two 600mA Outputs and
Individual Programmable References
The LTC
®
3569 contains three monolithic, synchronous
step-down DC/DC converters. Intended for medium power
applications, it operates over a 2.5V to 5.5V input voltage
range. The operating frequency is adjustable from 1MHz
to 3MHz, allowing the use of tiny, low cost capacitors and
inductors. The three output voltages are independently
programmable by toggling the EN pins up to 15 times,
lowering the 800mV FB references by 25mV per cycle. The
first buck regulator sources load currents up to 1200mA.
The other two buck regulators each provide 600mA.
The two 600mA buck regulators can also be configured
to operate as slave power stages, running in parallel with
another internal buck regulator to supply higher load
currents. When operating as parallel, slave output stages,
discrete external components are shared and available
output currents sum together.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents including 5481178, 6127815, 6304066,
6498466, 6580258, 6611131, 7170195.
Efficiency vs Load Current
n
Three Independent Current Mode Buck DC/DC
Regulators (1.2A and 2 × 600mA)
n
Single Pin Programmable V
FB
Servo Voltages from
800mV Down to 425mV (in 25mV Steps)
n
Pull V
FB
High to Make Each 600mA Buck a Slave for
Higher Current Operation
n
Pulse-Skipping or Burst Mode
®
Operation
n
Programmable Switching Frequency
(1MHz to 3MHz) or Fixed 2.25MHz
n
Synchronizable (1.2MHz to 3MHz)
n
V
IN
Range 2.5V to 5.5V
n
All Regulators Internally Compensated
n
PGOOD Output Flag
n
Quiescent Current <100µA (All Regulators in Burst
Mode Operation)
n
Zero Shutdown Current
n
Overtemperature and Short-Circuit Protection
n
Tiny 3mm × 3mm, 3mm × 4mm 20-Lead QFN and
Thermally Enhanced TSSOP FE-16 Packages
n
Portable Applications with Multiple Supply Rails
n
General Purpose Step-Down DC/DC
n
Dynamic Voltage Scaling Applications
3569 TA01a
SV
IN
PV
IN
SW1
PGNDSGND
SW2
SW3
PGOOD
FB1
EN1
EN2
EN3
MODE
R
T
FB2
FB3
22µF
V
IN
2.2µH*
10µF20pF
20pF
20pF
4.7µF
2.5µH**
510k
240k
300k
240k
OUT1 = 2.5V
1200mA
OUT2 = 1.8V
600mA
4.7µF
2.5µH**
150k
300k
OUT3 = 1.2V
600mA
LTC3569
* WURTH 7440430022
** WURTH 744031002
I
LOAD
(mA)
EFFICIENCY (%)
3569 TA01b
100
90
80
70
60
50
40
30
20
10
0
0.01 0.1 1 1000 1000010010
V
IN
= 3V
V
IN
= 5V
Burst Mode OPERATION
PULSE-SKIPPING
OUT1 = 2.5V
LTC3569
2
3569fe
For more information www.linear.com/LTC3569
absoluTe MaxiMuM raTings
SV
IN
Voltage .........................–0.3V to 6V (7V Transient)
PV
INX
Voltage .........................S
VIN
– 0.3V to S
VIN
+ 0.3V
ENx, MODE, PGOOD, SWx, FBx ..... –0.3V to S
VIN
+ 0.3V
R
T
Voltage .................................................... –0.3V to 6V
PGOOD Current ...................................................... ±1mA
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
FB3
SV
IN
SGND
EN3
EN2
EN1
SW3
*PV
IN1
FB1
FB2
R
T
MODE
PGOOD
PV
IN2
SW2
SW1
17
T
JMAX
= 125°C, θ
JA
= 38°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
*SHARES POWER WITH PV
IN3
20 19 18 17
7 8
TOP VIEW
21
GND
UDC PACKAGE
20-LEAD (3mm × 4mm) PLASTIC QFN
9 10
6
5
4
3
2
1
11
12
13
14
15
16
PGND2
SW2
PV
IN2
PGOOD
MODE
R
T
SW3
PGND3
EN1
EN2
EN3
SGND
PGND1
SW1
PV
IN1
PV
IN3
FB2
FB1
FB3
SV
IN
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
20 19 18 17 16
7 8
TOP VIEW
21
UD PACKAGE
20-LEAD (3mm × 3mm) PLASTIC QFN
9
10
SW2
PV
IN2
PGOOD
MODE
R
T
SW3
PGND3
EN1
EN2
EN3
PGND2
PGND1
SW1
PV
IN1
PV
IN3
FB2
FB1
FB3
SV
IN
SGND
12
11
13
14
15
4
5
3
2
1
6
T
JMAX
= 125°C, θ
JA
= 68°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
pin conFiguraTion
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3569EUD#PBF LTC3569EUD#TRPBF LDQF
20-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3569IUD#PBF LTC3569IUD#TRPBF LDQF
20-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3569EUDC#PBF LTC3569EUDC#TRPBF LFYW
20-Lead (3mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3569IUDC#PBF LTC3569IUDC#TRPBF LFYW
20-Lead (3mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3569EFE#PBF LTC3569EFE#TRPBF 3569FE 16-Lead Plastic TSSOP –40°C to 125°C
LTC3569IFE#PBF LTC3569IFE#TRPBF 3569FE 16-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.
For 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/
Operating Junction Temperature Range
(Notes 6, 7) ............................................ –40°C to 125°C
Storage Temperature Range .................. –65°C to 125°C
Peak Reflow Temperature .....................................260°C
(Notes 1, 6)
LTC3569
3
3569fe
For more information www.linear.com/LTC3569
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V unless otherwise noted (Notes 2, 7).
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SV
IN
Input Supply Voltage
l
2.5 5.5 V
I
VIN
Input Current Pulse-Skipping Mode EN1 = SV
IN
, EN2, EN3 = MODE = 0V,
I
OUT1
, = 0A, FB1 = 0.9V (Note 3)
230 365 µA
Input Current Burst Mode Operation EN1 = MODE = SV
IN
, EN2, EN3 = 0V,
I
OUT1
, = 0A, FB1 = 0.9V (Note 3)
47 82 µA
I
QX
Additional Input Current per Buck,
Pulse Skipping
MODE = 0V, I
OUTX
, = 0A, FBx = 0.9V
(Note 3)
140 225 µA
Additional Input Current per Buck,
Burst Mode Operation
MODE = SV
IN
, I
OUTX
, = 0A,
FBx = 0.9V (Note 3)
22 36 µA
I
QSHDN
Quiescent Current in Shutdown Mode EN1, EN2, EN3 = 0V
V
SW1
= V
SW2
= V
SW3
= 0V
0.1 1 µA
I
PK1
Peak Inductor Current SW1 1.8 2.0 2.5 A
I
PK2
, I
PK3
Peak Inductor Current SW2, SW3 0.780 1.0 1.3 A
V
FBX(MAX)
Maximum Feedback Voltage
l
0.784 0.8 0.816 V
V
FBX(STEP)
Feedback Reference Step Size Each Toggle on ENx 25 mV
V
FBX(MIN)
Minimum Feedback Voltage ENx Toggle 15 Times
l
0.405 0.425 0.44 V
V
PROGFBX
Feedback Programming Range 0.425 0.8 V
I
FBX
Feedback Pin Input Current V
FB
= 0.8V
l
±0.2 µA
I
LKSWX
Switch Pin Leakage Current V
SWX
= 1.8V, V
ENX
= SV
IN
,
V
FBX
= 0.9V
±1 µA
D
X
Maximum Duty Cycle FBx = 0V 100 %
R
P1
R
DSON
of PSW for SW1 I
SW1
= 100mA (Note 5) 195 mΩ
R
N1
R
DSON
of NSW for SW1 I
SW1
= –100mA (Note 5) 180 mΩ
R
P2
, R
P3
R
DSON
of PSW for SW2, SW3 I
SW2
, I
SW3
= 100mA (Note 5) 265 mΩ
R
N2
, R
N3
R
DSON
of NSW for SW2, SW3 I
SW2
, I
SW3
= –100mA (Note 5) 250 mΩ
RSWx_PD SWx Pull-Down in Shutdown ENx = 0V, V
SWX
= 1.2V,
(FBx < SV
IN
)
2.3 kΩ
∆V
LINEREG
Reference Voltage Line Regulation SV
IN
= 2.5V to 5.5V 0.04 0.2 %/V
∆V
LOADREG
Output Voltage Load Regulation Pulse-Skipping Mode (Note 4) 0.5 %
t
SS
Soft-Start Reference Ramp Rate 0.75 V/ms
t
EN
Enable Turn-On Delay From Last ENx Rise to Begin of
Soft-Start Ramp
125 240 µs
t
OFF
Enable Turn-Off Delay From ENx Fall to Shutdown 170 330 µs
t
PW
Enable Pulse Width 0.06 55 µs
I
ENX
Enable Leakage Current V
ENX
= 3.6V 0.02 µA
I
MODE
Mode Leakage Current V
MODE
= 3.6V 0.02 µA
V
IL
Input Low Voltage MODE, ENx 0.4 V
V
IH
Input High Voltage MODE, ENx 1.2 V
T
MODEPW
Pulse Width Applied to MODE Pin for
Synchronizing
100 ns
PGOOD Power Good Threshold V
FBX
Ramping Up
V
FBX
Ramping Down
–8
–12
%
%
T
PGOOD
PGOOD Delay Turn-On 8 µs
Turn-Off 2 µs
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LTC3569EFE#TRPBF

Mfr. #:
Buy LTC3569EFE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Programmable 1.2A and 2X600mA, Triple Buck Regulator
Lifecycle:
New from this manufacturer.
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