LTC3785 Datasheet, PDF (2/20 Pages) Linear Technology – 10V, High Effi ciency, Synchronous, No RSENSE Buck-Boost Controller

LTC3785
ABSOLUTE AXI U RATI GS
(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
TG1, V_BST1 Voltages................................... –0.3V to 16V
With Respect to SW1............................... –0.3V to 6V
TG2, V_BST2 Voltages................................... –0.3V to 16V
With Respect to SW2............................... –0.3V to 6V
BG1, BG2 Voltage ........................................ –0.3V to 6V
Peak Driver Output Current < 10µs
(TG1, TG2, BG1, BG2).................................................3A
V_CC Average Output Current.................................100mA
Operating Temperature Range ................. –40°C to 85°C
Storage Temperature Range................... –65°C to 125°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
16 V_DRV
25
15 BG2
14 I_SSW2
13 SW2
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 = 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
LTC3785EUF#PBF
LTC3785EUF#TRPBF
3785
24-Lead (4mm × 4mm) Plastic QFN
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3785EUF
LTC3785EUF#TR
3785
24-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
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 = 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
● 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, V_OUT = 0V
MODE = 0V (Note 4)
86
200
µA
15
25
µA
0.8
1.5
mA
Error Amp
Feedback Voltage
(Note 5)
● 1.200 1.225 1.25
V
Feedback Input Current
(Note 5)
1
500
nA
Error Amp Source Current
–500
µA
Error Amp Sink Current
900
µA
Error Amp A_VOL
Overvoltage Threshold
V_SENSE Pin. % Above FB
90
dB
●
6
10
14
%
3785f
2