LTC3859_15 Datasheet, PDF (3/42 Pages) Linear Technology – Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller

LTC3859
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3859EFE#PBF
LTC3859EFE#TRPBF
LTC3859FE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3859IFE#PBF
LTC3859IFE#TRPBF
LTC3859FE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3859EUHF#PBF
LTC3859EUHF#TRPBF 3859
38-Lead (5mm ¥ 7mm) Plastic QFN
–40°C to 125°C
LTC3859IUHF#PBF
LTC3859IUHF#TRPBF 3859
38-Lead (5mm ¥ 7mm) 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/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
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_BIAS = 12V, V_RUN1,2,3 = 5V, EXTV_CC = 0V unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_BIAS
V_{FB1, 2}
V_FB3
I_{FB1, 2, 3}
Bias Input Supply Operating Voltage
Range
Buck Regulated Feedback Voltage
Boost Regulated Feedback Voltage
Feedback Current
(Note 4); I_TH1,2 Voltage = 1.2V
–40°C to 125°C
–40°C to 85°C
(Note 4); I_TH3 Voltage = 1.2V
–40°C to 125°C
–40°C to 85°C
(Note 4)
4.5
38
V
l 0.788 0.800 0.812
V
0.792 0.800 0.808
V
l 1.182 1.200 1.218
V
1.188 1.200 1.212
V
±5 ±50
nA
V_REFLNREG
Reference Voltage Line Regulation
(Note 4); V_IN = 4V to 38V
0.002 0.02 %/V
V_LOADREG
Output Voltage Load Regulation
g_{m1, 2, 3}
I_Q
Transconductance Amplifier g_m
Input DC Supply Current
Pulse-Skipping or
Forced Continuous Mode
(One Channel On)
Pulse-Skipping or
Forced Continuous Mode
(All Channels On)
Sleep Mode
(One Channel On, Buck)
Sleep Mode
(One Channel On, Boost)
Sleep Mode
(Buck and Boost Channel On)
Sleep Mode
(All Three Channels On)
Shutdown
(Note 4)
Measured in Servo Loop;
DI_TH Voltage = 1.2V to 0.7V
Measured in Servo Loop;
DI_TH Voltage = 1.2V to 2V
(Note 4); I_TH1,2,3 = 1.2V;
Sink/Source 5μA
(Note 5)
RUN1 = 5V and RUN2,3 = 0V or
RUN2 = 5V and RUN1,3 = 0V or
RUN3 = 5V and RUN1,2 = 0V
V_{FB1, 2} ON = 0.83V (No Load)
V_FB3 = 1.25V
RUN1,2,3 = 5V,
V_FB1,2 = 0.83V (No Load)
V_FB3 = 1.25V
RUN1 = 5V and RUN2,3 = 0V or
RUN2 = 5V and RUN1,3 = 0V
V_FB,ON = 0.83V (No Load)
RUN3 = 5V and RUN1,2 = 0V
V_FB3 = 1.25V
RUN1 = 5V and RUN2 = 0V or
RUN2 = 5V and RUN1 = 0V
RUN3 = 5V
V_FB1,2 = 0.83V (No Load)
V_FB3 = 1.25V
RUN1,2,3 = 5V,
V_FB1,2 = 0.83V (No Load)
V_FB3 = 1.25V
RUN1,2,3 = 0V
l
0.01 0.1
%
l
–0.01 –0.1
%
2
mmho
2
mA
3
mA
55 80
μA
55 80
μA
65 100
μA
80 120
μA
14 30
μA
3859fa
3