LTC3444_15 Datasheet, PDF (2/20 Pages) Linear Technology – Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications

LTC3444
ABSOLUTE AXI U RATI GS
(Note 1)
V_IN,V_OUT 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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SHDN 1
SW1 2
GND 3
SW2 4
8 FB
7 V_C
9
6 V_IN
5 V_OUT
ORDER PART
NUMBER
LTC3444EDD
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
T_JMAX = 125°C, θ_JA = 43°C/W,
4-LAYER BOARD θ_JC = 2.96°C/W
EXPOSED PAD IS GND (PIN 9)
MUST BE SOLDERED TO PCB
DD PART MARKING
LBVZ
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/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T_A = 25°C.
V_IN = V_OUT = 3.6V unless otherwise noted.
PARAMETER
Input Start-Up Voltage
Output Voltage Adjust Range
Feedback Voltage
Feedback Input Current
Quiescent Current - Shutdown
Quiescent Current - Active
NMOS Switch Leakage
PMOS Switch Leakage
NMOS Switch On Resistance
PMOS Switch On Resistance
PMOS Switch On Resistance
Input Current Limit
Reverse Current Limit
Max Duty Cycle
Min Duty Cycle
Frequency Accuracy
Error Amp A_VOL
Error Amp Source Current
Error Amp Sink Current
Internal Soft-Start Time
Output OV Threshold
CONDITIONS
V_FB = 1.22V
SD = 0V, V_OUT = 0V Not Including Switch Leakage
(Note 3)
Switches B and C
Switches A and D
Switches B and C
Switches A and D
Switch D V_IN = 3.6, V_OUT = 1V
Boost (%Switch C On)
Buck (% Switch A On)
V_C = 1.5V, FB = 0V
V_C = 1.5V, FB = 1.5V
SHDN Going High
MIN TYP MAX
● 2.55 2.65 2.75
● 0.5
5
● 1.19 1.22 1.25
1
50
0.1 1
700 1100
0.1 7
0.1 10
0.19
0.22
0.4
● 2.5 3.5
●
3
● 70 82
● 100
●
0
● 1.2 1.5 1.8
65
8
230
250
● 5.1 5.3 5.5
2
UNITS
V
V
V
nA
μA
μA
μA
μA
Ω
Ω
Ω
A
A
%
%
%
MHz
dB
μA
μA
μs
V
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