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LTC3562EUD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC3562
1
3562fa
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES
APPLICATIONS
DESCRIPTION
I
2
C Quad Synchronous
Step-Down DC/DC Regulator
2 × 600mA, 2 × 400mA
The LTC
®
3562 is a quad high effi ciency monolithic syn-
chronous step-down regulator with an I
2
C interface. Two
regulators are externally adjustable and can have their
feedback voltages programmed between 425mV and
800mV in 25mV steps (Type A). The other two regulators
are fi xed output regulators whose output voltages can be
programmed between 600mV and 3.775V in 25mV steps
(Type B). All four regulators operate independently and
can be put into pulse skip, LDO, Burst Mode operation,
or forced Burst Mode operation through I
2
C control. The
Type-A regulators have separate RUN pins that can be
enabled if I
2
C control is unavailable.
The 2.85V to 5.5V input voltage range makes the LTC3562
ideally suited for single Li-Ion battery-powered applica-
tions. At low output load conditions, the regulators can
be switched into LDO, Burst Mode operation, or forced
Burst Mode operation, extending battery life in portable
systems. The quiescent current drops to under 100μA
with all regulators in LDO mode, and under 0.1μA when
all regulators are shut down.
Switching frequency is internally set to 2.25MHz, allowing
the use of small surface mount inductors and capacitors.
All regulators are internally compensated. The LTC3562 is
available in a low profi le 3mm × 3mm QFN package.
High Effi ciency Quad Step-Down Converter with I
2
C
n
Four Independent I
2
C Controllable Step-Down
Regulators (2 × 600mA, 2 × 400mA)
n
Two I
2
C Programmable Feedback Voltage
Regulators (R600A, R400A): V
FB
425mV to 800mV
n
Two I
2
C Programmable Output Voltage Regulators
(R600B, R400B): V
OUT
600mV to 3.775V
n
Programmable Modes: Pulse Skip, LDO, Burst Mode,
®
Forced Burst Mode Operation
n
Quiescent Current < 100μA (All Regulators Enabled
in LDO Mode)
n
Fixed 2.25MHz Switching Frequency (Pulse Skip
Mode)
n
Slew Limiting Reduces Switching Noise
n
Power-On Reset Output for Regulator R600A
n
Small, Thermally Enhanced, 20-Lead 3mm × 3mm
QFN Package
n
Miscellaneous Handheld Applications with Multiple
Supply Rails
n
Personal Information Appliances
n
Wireless and DSL Modems
n
Digital Still Cameras
n
MP3 Players
n
Portable Instruments
R600x Burst Mode Effi ciency
and Power Loss vs Load Current
TYPICAL APPLICATION
SW400A
SDA
SCL
DV
CC
POR
100k
10pF
3.3
μH4.7μH
634k
10
μF
FB400A
RUN400A
SW400B
POR600A
V
IN
SCL SDA DV
CC
SW600A
FB600A
RUN600A
SW600B
OUT400B OUT600B
PGND AGND
LTC3562
V
OUT
400A
1.5V
400mA
Li-Ion/Polymer
3.4V TO 4.2V
MICROPROCESSOR
3562 TA01
10μF
475k
536k
10pF10
μF
499k
4.7μH
V
OUT
400B
1.2V
400mA
10
μF
3.3μH
V
OUT
600B
3.3V
600mA
V
OUT
600A
1.8V
600mA
10
μF
+
LOAD CURRENT (mA)
0.01
40
EFFICIENCY (%)
POWER LOSS (mW)
50
60
70
80
0.1 1 10010 1000
30
20
10
0
90
100
10
100
1000
1
0.1
10000
3562 TA01b
V
IN
= 3.8V
V
OUT
= 3.3V
V
OUT
= 1.2V
V
OUT
= 3.3V
V
OUT
=
2.5V
V
OUT
= 1.2V,
1.8V, 2.5V
V
OUT
=
1.8V
LTC3562
2
3562fa
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3562EUD#PBF LTC3562EUD#TRPBF LCPV 20-Lead (3mm × 3mm) Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
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
ELECTRICAL CHARACTERISTICS
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
IN
...............................................................–0.3V to 6V
RUN600A ...................................... –0.3V to (V
IN
+ 0.3V)
RUN400A ...................................... –0.3V to (V
IN
+ 0.3V)
FBx ............................................................... –0.3V to 6V
SWx .............................................................–0.3V to 6V
OUTx ............................................................–0.3V to 6V
DV
CC
, POR600A, SDA, SCL .........................–0.3V to 6V
I
SW400x
(DC) ........................................................600mA
I
SW600x
(DC) ........................................................850mA
Operating Temperature (Note 2)...............–40°C to 85°C
Storage Temperature Range ...................–65°C to 125°C
Junction Temperature (Note 3) ............................. 125°C
(Notes 1, 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range
l
2.7 5.5 V
V
IN
Input Current (Per Regulator Enabled) Pulse Skip Mode, I
OUT
= 0
Burst Mode Operation, I
OUT
= 0
Forced Burst Mode Operation, I
OUT
= 0
LDO Mode, I
OUT
= 0
Shutdown Mode, I
OUT
= 0, DV
CC
= 1.8V
220
35
25
24
0.7
60
40
40
3
μA
μA
μA
μA
μA
V
IN
Shutdown Current All Regulators in Shutdown, DV
CC
= 0V 0.1 1 μA
RUN600A, RUN400A Input High Threshold
l
1.0 V
RUN600A, RUN400A Input Low Threshold
l
0.3 V
RUN600A, RUN400A Input High Current RUNx = V
IN
–1 1 μA
RUN600A, RUN400A Input Low Current RUNx = 0V
–1 1 μA
POR600A Threshold Percentage of R600A’s Final Output Voltage –8 %
POR600A On-Resistance 16 40
Ω
POR600A Delay
231 ms
20 19 18 17 16
7 8
TOP VIEW
21
UD PACKAGE
20-LEAD (3mm × 3mm) PLASTIC QFN
9 10
AGND
FB400A
OUT400B
SW400B
PGND
POR600A
FB600A
OUT600B
SW600B
PGND
SDA
SCL
DV
CC
RUN600A
RUN400A
SW400A
V
IN
V
IN
V
IN
SW600A
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
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
= 3.8V, unless otherwise noted.
LTC3562
3
3562fa
BUCK DC/DC ELECTRICAL CHARACTERISTICS
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
= 3.8V, V
OUTx
= 1.5V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
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
= 3.8V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
I
2
C Port
DV
CC
Operating Voltage
l
1.5 5.5 V
DV
CC
Operating Current DV
CC
= 1.8V, Serial Port Idle 1 μA
DV
CC
UVLO Threshold Voltage 1V
V
IL
SDA, SCL (Low Level Input Voltage) 0.3 • DV
CC
V
V
IH
SDA, SCL (High Level Input Voltage) 0.7 • DV
CC
V
V
OL
SDA (Digital Output Low) I
PULLUP
= 3mA 0.08 V
Serial Port Timing (Note 4)
t
SCL
Clock Operating Frequency 400 kHz
t
BUF
Bus Free Time Between Stop and Start Conditions 1.3 μs
t
HD,STA
Hold Time After (Repeated) Start Condition 0.6 μs
t
SU,STA
Repeated Start Condition Setup Time 0.6 μs
t
SU,STO
Stop Condition Setup Time 0.6 μs
t
HD,DAT(OUT)
Data Hold Time 225 ns
t
HD,DAT(IN)
Input Data Hold Time 0 900 ns
t
SU,DAT
Data Setup Time 100 ns
t
LOW
Clock Low Period 1.3 μs
t
HIGH
Clock High Period 0.6 μs
t
f
Clock Data Fall Time 20 300 ns
t
r
Clock Data Rise Time 20 300 ns
t
SP
Spike Suppression Time 50 ns
PARAMETER CONDITIONS MIN TYP MAX UNITS
Regulators R600A, R400A, R600B, R400B
f
OSC
1.91 2.25 2.59 MHz
Maximum Duty Cycle Pulse Skip Mode
100 %
LDO Mode Closed Loop R
OUT
LDO Mode 0.25
Ω
Regulators R600A, R600B
PMOS Switch Current Limit Pulse Skip Mode 850 1200 1500 mA
PMOS R
DS(ON)
0.38
Ω
NMOS R
DS(ON)
0.38
Ω
LDO Mode Open Loop R
OUT
LDO Mode 2.2
Ω
Available Output Current Forced Burst Mode
LDO, V
OUT
= 1.2V
75
50
140 mA
mA
SW Pull-Down in Shutdown Shutdown 2.5 kΩ
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LTC3562EUD#PBF

Mfr. #:
Buy LTC3562EUD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Quad Synch Step-Down DC/DC Regulator
Lifecycle:
New from this manufacturer.
Delivery:
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