LTC3442 Datasheet, PDF (2/20 Pages) Linear Integrated Systems – Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation

LTC3442
ABSOLUTE AXI U RATI GS
(Note 1)
V_IN, V_OUT Voltage........................................... – 0.3 to 6V
SW1, SW2 Voltage
DC ................................................................. – 0.3 to 6V
Pulsed <100ns ............................................... – 0.3 to 7V
SHDN/SS, BURST 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/SS 1
RT 2
SGND 3
SW1 4
PGND 5
SW2 6
12 FB
11 V_C
10 R_LIM
13
9 V_IN
8 V_OUT
7 BURST
DE12 PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
T_JMAX = 125°C, θ_JA = 53°C/W 1-Layer Board
θ_JA = 43°C/W 4-Layer Board, θ_JC = 4.3°C/W
EXPOSED PAD IS PGND (PIN 13), MUST BE SOLDERED TO PCB
ORDER PART NUMBER DE PART MARKING
LTC3442EDE
3442
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 the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = V_OUT = 3.6V, R_T = 64.9k, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Start-Up Voltage
●
2.3
2.4
V
Output Voltage Adjust Range
● 2.4
5.25
V
Feedback Voltage
● 1.19 1.22 1.25
V
Feedback Input Current
Quiescent Current – Burst Mode Operation
Quiescent Current – Shutdown
Quiescent Current – Active
NMOS Switch Leakage
V_FB = 1.22V
V_FB = 1.22V, BURST = 0V (Note 3)
SHDN = 0V, V_OUT = 0V, Not Including Switch Leakage
BURST = V_IN (Note 3)
Switches B and C
1
50
nA
35
60
µA
0.1
1
µA
600 1100
µA
0.1
2
µA
PMOS Switch Leakage
Switches A and D
0.1
3
µA
NMOS Switch On Resistance
PMOS Switch On Resistance
Switches B and C
Switches A and D
0.10
Ω
0.10
Ω
Input Current Limit
●2
3
A
Reverse Current Limit
0.5
A
Burst Mode Operation Current Limit
0.9
A
Max Duty Cycle
Boost (% Switch C On)
Buck (% Switch A In)
● 70
88
%
● 100
%
Min Duty Cycle
●
0
%
Frequency Accuracy
● 570
670
770
kHz
Error Amp A_VOL
Error Amp Source Current
90
dB
11
µA
Error Amp Sink Current
300
µA
Burst Threshold (Falling)
0.88
V
Burst Threshold (Rising)
1.12
V
3442fa
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