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LTC3444 Datasheet(PDF) 2 Page - Linear Technology

Part # LTC3444
Description  Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3444 Datasheet(HTML) 2 Page - Linear Technology

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2
LTC3444
3444fb
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
LTC3444EDD
ORDER PART
NUMBER
DD PART MARKING
LBVZ
TJMAX = 125°C, θJA = 43°C/W,
4-LAYER BOARD
θJC = 2.96°C/W
EXPOSED PAD IS GND (PIN 9)
MUST BE SOLDERED TO PCB
The
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = VOUT = 3.6V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
VIN,VOUT Voltages .......................................... –0.3 to 6V
SW1,SW2 Voltages DC .................................. –0.3 to 6V
Pulsed <100ns ............... –0.3 to 7V
SHDN Voltage ................................................ –0.3 to 6V
Operating Temperature (Note 2) .............. –40
°C to 85°C
Maximum Junction Temperature (Note 4) ............ 125
°C
Storage Temperature Range .................. –65
°C to 125°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Start-Up Voltage
2.55
2.65
2.75
V
Output Voltage Adjust Range
0.5
5
V
Feedback Voltage
1.19
1.22
1.25
V
Feedback Input Current
VFB = 1.22V
1
50
nA
Quiescent Current - Shutdown
SD = 0V, VOUT = 0V Not Including Switch Leakage
0.1
1
μA
Quiescent Current - Active
(Note 3)
700
1100
μA
NMOS Switch Leakage
Switches B and C
0.1
7
μA
PMOS Switch Leakage
Switches A and D
0.1
10
μA
NMOS Switch On Resistance
Switches B and C
0.19
Ω
PMOS Switch On Resistance
Switches A and D
0.22
Ω
PMOS Switch On Resistance
Switch D VIN = 3.6, VOUT = 1V
0.4
Ω
Input Current Limit
2.5
3.5
A
Reverse Current Limit
3A
Max Duty Cycle
Boost (%Switch C On)
70
82
%
Buck (% Switch A On)
100
%
Min Duty Cycle
0%
Frequency Accuracy
1.2
1.5
1.8
MHz
Error Amp AVOL
65
dB
Error Amp Source Current
VC = 1.5V, FB = 0V
8
μA
Error Amp Sink Current
VC = 1.5V, FB = 1.5V
230
μA
Internal Soft-Start Time
SHDN Going High
250
μs
Output OV Threshold
5.1
5.3
5.5
V
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF
Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
TOP VIEW
DD PACKAGE
8-LEAD (3mm
× 3mm) PLASTIC DFN
5
6
7
8
4
3
2
1
9
SHDN
SW1
GND
SW2
FB
VC
VIN
VOUT


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