Datasheet

2
LT3420/LT3420-1
3420fb
1
2
3
4
5
R
REF
V
BAT
R
FB
V
CC
GND
10
9
8
7
6
C
T
CHARGE
DONE
SEC
SW
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage, V
CC
● 2.2 2.5 V
Maximum Operating Voltage, V
CC
16 V
V
CC
UVLO Hysteresis 40 mV
Minimum V
BAT
Voltage 1.6 1.8 V
Maximum V
BAT
Voltage 16 V
V
BAT
UVLO Hysteresis 275 mV
R
REF
Threshold Voltage 0.98 1.00 1.02 V
● 0.975 1.025 V
R
REF
Pin Bias Current V
RREF
= 0V, Switching 2 4 µA
V
RFB
= V
BAT
– 0.2V (Note 4)
Quiescent Current V
RREF
= 1.1V, Not Switching 90 130 µA
Quiescent Current in Shutdown V
CHARGE
= 0V, V
IN
= 3.3V 0.01 1 µA
Consult LTC Marketing for parts specified with wider operating temperature ranges.
V
CC
Voltage .............................................................. 16V
V
BAT
Voltage ............................................................ 16V
SW Voltage (Note 2)
LT3420 ................................................................ 38V
LT3420-1............................................................ 50V
SEC Current ...................................................... ±200mA
R
FB
Current ........................................................... ±3mA
R
REF
Voltage ........................................................... 2.5V
CHARGE Voltage...................................................... 16V
CT Voltage .............................................................. 1.5V
ABSOLUTE AXI U RATI GS
W
WW
U
(Note 1)
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= V
BAT
= 3.3V, V
CHARGE
= V
CC
unless otherwise noted. (Note 3)
T
JMAX
= 125°C, θ
JA
= 100°C/W, θ
JC
= 45°C/W
(4-LAYER BOARD)
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
C
T
CHARGE
DONE
SEC
SW
R
REF
V
BAT
R
FB
V
CC
GND
11
ORDER PART
NUMBER
LT3420EDD
LT3420EDD-1
T
JMAX
= 125°C, θ
JA
= 43°C/W, θ
JC
= 3°C/W
EXPOSED PAD IS GND (PIN 11)
AND MUST BE SOLDERED TO PCB
PACKAGE/ORDER INFORMATION
W
U
U
DD PART
MARKING
LBJW
LBJX
ORDER PART
NUMBER
MS PART MARKING
LTYH
LTAJG
LT3420EMS
LT3420EMS-1
DONE Voltage .......................................................... 16V
Current into DONE Pin .......................................... ±1mA
Maximum Junction Temperature .......................... 125°C
Operating Ambient Temperature Range
(Note 3) .............................................. –40°C to 85°C
Storage Temperature Range ................. – 40°C to 125°C
Lead Temperature (Soldering, 10 sec)
(For MS Package only) ..................................... 300°C