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LTC3548EDD-1#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3548-1
1
35481fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual Synchronous, Fixed
Output 2.25MHz Step-Down
DC/DC Regulator
The LTC
®
3548-1 is a dual, fi xed output, constant-frequency,
synchronous step-down DC/DC converter. Intended for low
power applications, it operates from 2.5V to 5.5V input
voltage range and has a constant 2.25MHz switching
frequency, allowing the use of tiny, low cost capacitors
and inductors with a profi le ≤1mm. The output voltage
for channel 1 is fi xed at 1.8V and for channel 2 is fi xed
at 1.575V. Internal synchronous 0.35, 1.2A/0.7A power
switches provide high effi ciency without the need for ex-
ternal Schottky diodes. Burst Mode
®
operation provides
high effi ciency at light loads.
To further maximize battery runtime, the P-channel
MOSFETs are turned on continuously in dropout (100%
duty cycle), and both channels draw a total quiescent cur-
rent of only 40µA. In shutdown, the device draws <1µA.
The LTC3548-1 is available in both thin (0.75mm) and
ultrathin (0.55mm) 3mm × 3mm DFN packages.
Figure 1. 1.8V/1.575V at 800mA/400mA Step-Down Regulators
n
High Effi ciency: Up to 95%
n
1.8V at 800mA/1.575V at 400mA
n
Very Low Quiescent Current: Only 40μA
n
2.25MHz Constant-Frequency Operation
n
High Switch Current: 1.2A and 0.7A
n
No Schottky Diodes Required
n
V
IN
: 2.5V to 5.5V
n
Current Mode Operation for Excellent Line
and Load Transient Response
n
Short-Circuit Protected
n
Low Dropout Operation: 100% Duty Cycle
n
Ultralow Shutdown Current: I
Q
< 1µA
n
Small Thermally Enhanced 3mm × 3mm
DFN Packages
n
PDAs/Palmtop PCs
n
Digital Cameras
n
Cellular Phones
n
Portable Media Players
n
PC Cards
n
Wireless and DSL Modems
LTC3548-1 Effi ciency Curve/Power Loss
RUN2V
IN
V
IN
2.7V TO 5.5V
V
OUT2
1.575V
400mA
V
OUT1
1.8V
800mA
RUN1
SW1
V
FB1
GND
V
FB2
V
OUT1
V
OUT2
SW2
LTC3548-1
C
IN
10µF
CER
C
OUT1
10µF
CER
C
OUT2
10µF
CER
2.2µH4.7µH
C
FF1
330pF
C
FF2
330pF
3548-1 F01
LOAD CURRENT (mA)
1
80
EFFICIENCY (%)
POWER LOSS (mW)
90
100
10 100 1000
35481 F01b
70
75
85
95
65
60
10
100
1000
1
0.1
V
OUT1
= 1.8V
V
OUT2
= 1.575V
CHANNEL 1
CHANNEL 2
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
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..
LTC3548-1
2
35481fc
ABSOLUTE MAXIMUM RATINGS
V
IN
Voltages .................................................–0.3V to 6V
V
FB1
, V
FB2
, V
OUT1
, V
OUT2
Voltages .... –0.3V to V
IN
+ 0.3V
RUN1, RUN2 Voltages .................................–0.3V to V
IN
SW1, SW2 Voltage ........................... –0.3V to V
IN
+ 0.3V
(Note 1)
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
11
9
6
7
8
4
5
3
2
1
V
FB2
V
OUT2
RUN1
SW2
RUN2
V
FB1
V
OUT1
V
IN
SW1
GND
T
JMAX
= 125°C, θ
JA
= 40°C/W, θ
JC
= 3°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB GND
(SOLDERED TO A 4-LAYER BOARD)
TOP VIEW
11
KD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC UTDFN
10
9
6
7
8
4
5
3
2
1
V
FB2
V
OUT2
RUN1
SW2
RUN2
V
FB1
V
OUT1
V
IN
SW1
GND
T
JMAX
= 125°C, θ
JA
= 43°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB GND
(SOLDERED TO A 4-LAYER BOARD)
PIN CONFIGURATION
ORDER INFORMATION
Ambient Operating Temperature Range
(Note 2) ....................................................– 40°C to 85°C
Junction Temperature (Note 5) ............................. 125°C
Storage Temperature Range ...................– 65°C to 125°C
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3548EDD-1#PBF LTC3548EDD-1#TRPBF LBZC
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC3548EKD-1#PBF LTC3548EKD-1#TRPBF CXVT
10-Lead (3mm × 3mm) Plastic UTDFN
–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/
LTC3548-1
3
35481fc
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3548-1 is guaranteed to meet specifi ed performance from
0°C to 85°C. Specifi cations over the – 40°C to 85°C operating temperature
range are assured by design, characterization and correlation with
statistical process controls.
Note 3: The LTC3548-1 is tested in a proprietary test mode that connects
the output of the error amplifi er to an outside servo-loop.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: T
J
is calculated from the ambient T
A
and power dissipation P
D
according to the following formula: T
J
= T
A
+ (P
D
• θ
JA
).
Note 6: The DFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage Range
●
2.5 5.5 V
V
OUT1
Output Voltage 0°C ≤ T
A
≤ 85°C (Note 3)
–40°C ≤ T
A
≤ 85°C (Note 3) ●
1.764
1.755
1.8
1.8
1.836
1.836
V
V
V
OUT2
Output Voltage 0°C ≤ T
A
≤ 85°C (Note 3)
–40°C ≤ T
A
≤ 85°C (Note 3) ●
1.544
1.536
1.575
1.575
1.607
1.607
V
V
∆V
LINE REG
Reference Voltage Line Regulation V
IN
= 2.5V to 5.5V (Note 3) 0.3 0.5 %/V
∆V
LOAD REG
Output Voltage Load Regulation (Note 3) 0.5 %
I
S
Input DC Supply Current
Active Mode
Sleep Mode
Shutdown
(Note 4)
V
OUT1
= 1.5V, V
OUT2
= 1.3V
V
OUT1
= 1.9V, V
OUT2
= 1.65V
RUN = 0V, V
IN
= 5.5V
700
40
0.1
950
60
1
µA
µA
µA
f
OSC
Oscillator Frequency V
OUT1
= 1.8V, V
OUT2
= 1.575V
●
1.8 2.25 2.7 MHz
I
LIM
Peak Switch Current Limit Channel 1
Peak Switch Current Limit Channel 2
V
IN
= 3V, Duty Cycle <35%
V
IN
= 3V, Duty Cycle <35%
0.95
0.6
1.2
0.7
1.6
0.9
A
A
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
(Note 6)
(Note 6)
0.35
0.30
0.45
0.45
I
SW(LKG)
Switch Leakage Current V
IN
= 5V, V
RUN
= 0V, V
OUT1
= V
OUT2
= 0 0.01 1 µA
V
RUN
RUN Threshold
●
0.3 1 1.5 V
I
RUN
RUN Leakage Current
●
0.01 1 µA
V
MODE
Mode Threshold Low
Mode Threshold High
0
V
IN
– 0.5
0.5
V
IN
V
V
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
= 3.6V, unless otherwise specifi ed. (Note 2)
TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode Operation
Load Step
Load Step
3548-1 G01
V
IN
= 3.6V
V
OUT1
= 1.8V
I
LOAD
= 60mA
CHANNEL 1; CIRCUIT OF FIGURE 3
SW
5V/DIV
V
OUT1
20mV/DIV
I
L
200mA/DIV
2µs/DIV
3548-1 G02
V
IN
= 3.6V
V
OUT1
= 1.8V
I
LOAD
= 80mA TO 800mA
CHANNEL 1; CIRCUIT OF FIGURE 3
I
LOAD
80mA TO
800mA
500mA/DIV
V
OUT1
200mV/DIV
I
L
500mA/DIV
20µs/DIV
3548-1 G03
V
IN
= 3.6V
V
OUT2
= 1.575V
I
LOAD
= 40mA TO 400mA
CHANNEL 2; CIRCUIT OF FIGURE 3
I
LOAD
40mA TO
400mA
200mA/DIV
V
OUT2
200mV/DIV
I
L
200mA/DIV
20µs/DIV
T
A
= 25°C unless otherwise specifi ed.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3548EDD-1#PBF

Mfr. #:
Buy LTC3548EDD-1#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual, Sync. 800mA/400mA, 2.25MHz in DFN
Lifecycle:
New from this manufacturer.
Delivery:
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