LTC3785_15 Datasheet, PDF (2/20 Pages) Linear Technology – 10V, High Efficiency, Synchronous, No RSENSE Buck-Boost Controller

LTC3785
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage (V_IN).......................... –0.3V to 11V
I_SVOUT, I_SVIN ............................................... –0.3V to 11V
SW1, SW2, I_SSW1, I_SSW2 Voltage:
DC............................................................. –1V to 11V
Pulsed, <1µs.............................................. –2V to 12V
RUN/SS, MODE, CCM, V_DRV, V_CC Voltages... –0.3V to 6V
V_BST1 Voltage............................................. –0.3V to 16V
With Respect to SW1............................... –0.3V to 6V
V_BST2 Voltage............................................. –0.3V to 16V
With Respect to SW2............................... –0.3V to 6V
Peak Driver Output Current < 10µs
(TG1, TG2, BG1, BG2).................................................3A
V_CC Average Output Current.................................100mA
Operating Junction Temperature Range
(Note 2)..................................................–40°C to 125°C
Junction Temperature............................................ 125°C
Storage Temperature Range...................–65°C to 150°C
Pin Configuration
TOP VIEW
24 23 22 21 20 19
RUN/SS 1
V_C 2
FB 3
V_SENSE 4
I_LSET 5
CCM 6
18 I_SSW1
17 BG1
25
16 V_DRV
GND
15 BG2
14 I_SSW2
13 SW2
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 40°C/W 1 LAYER BOARD, θ_JA = 30°C/W 4 LAYER BOARD
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3785EUF#PBF
LTC3785EUF#TRPBF
3785
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 85°C
LTC3785IUF#PBF
LTC3785IUF#TRPBF
3785
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3785EUF
LTC3785EUF#TR
3785
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 85°C
LTC3785IUF
LTC3785IUF#TR
3785
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to: http://www.linear.com/packaging/
Electrical Characteristics The l denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at T_A = 25°C. V_IN = I_SVOUT = V_DRV = V_BST1 = V_BST2 = 3.6V, R_T = 49.9k, R_ILSET = 59k.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_IN Supply
Input Operating Voltage
l 2.7
10
V
Quiescent Current—Burst Mode Operation
Quiescent Current—Shutdown
Quiescent Current—Active
V_C = 0V, MODE = 3.6V (Note 4)
RUN/SS = 0V, I_SVOUT = 3.6V
MODE = 0V (Note 4)
86
200
µA
15
25
µA
0.8
1.5
mA
Error Amp
Feedback Voltage
(Note 5)
l 1.200 1.225 1.25
V
Feedback Input Current
1
500
nA
3785fc