LTC3421_15 Datasheet, PDF (2/16 Pages) Linear Technology – 3A, 3MHz Micropower Synchronous Boost Converter with Output Disconnect

LTC3421
ABSOLUTE AXI U RATI GS
(Note 1)
V_IN, V_OUT, V_OUTS Voltage ............................ – 0.3V to 6V
BURST, SHDN, SS, ENB, SW,
LBO, LBI, SYNC Voltages .......................... – 0.3V to 6V
Operating Temperature Range
(Notes 2, 5) ............................................. –40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
24 23 22 21 20 19
FB 1
SHDN 2
V_REF 3
ENB 4
R_T 5
SS 6
18 V_OUTS
17 V_OUT
16 SW
25
15 SW
14 SW
13 PGND
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 40°C/W 1 LAYER BOARD,
θ_JA = 35°C/W 4 LAYER BOARD, θ_JC = 2.6°C/W
EXPOSED PAD IS GND (PIN 25) MUST BE SOLDERED TO PCB
ORDER PART NUMBER
LTC3421EUF
UF PART MARKING
3421
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 1.2V, V_OUT = 3.3V, R_T = 28k, unless otherwise noted.
PARAMETER
Minimum V_IN Start-Up Voltage
Minimum V_IN Operating Voltage
Output Voltage Adjust Range
Feedback Voltage
Feedback Input Current
Quiescent Current—Burst Mode Operation
Quiescent Current—Shutdown
Quiescent Current—Active
NMOS Switch Leakage
PMOS Switch Leakage
NMOS Switch On Resistance
PMOS Switch On Resistance
NMOS Current Limit
Max Duty Cycle
Min Duty Cycle
CONDITIONS
I_LOAD < 1mA
(Note 4)
V_FB = 1.22V
V_C = 0V, ENB = 0V (Note 3)
V_C = 0V, ENB = 2V (Note 3)
SHDN = 0V, ENB = 0V
SHDN = 0V, ENB > 1.4V
(Note 3)
I_LIM Resistor = 105k
I_LIM Resistor = 36.5k
MIN
q
2.25
q 2.40
q 1.196
q1
q3
q 84
q
TYP
0.88
1.220
1
12
23
0.1
0.2
0.6
0.1
0.1
0.1
0.14
1.5
4.2
91
MAX
1
0.5
5.25
5.25
1.244
50
20
50
1
2
1.1
5
10
0
UNITS
V
V
V
V
V
nA
µA
µA
µA
µA
mA
µA
µA
Ω
Ω
A
A
%
%
3421f
2