LTC3546 Datasheet, PDF (2/28 Pages) Linear Technology – Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator

LTC3546
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V_IN1, V_IN1D, V_IN2, V_CCA, V_CCD Voltages......... –0.3V to 6V
SYNC/MODE, SW1, SW1D, SW2A, SW2B,
RUN1, RUN2, V_FB1, V_FB2, PHASE, FREQ,
I_TH1, I_TH2, TRACK/SS1, TRACK/SS2, BMC1,
BMC2 Voltages ............ –0.3V to (V_IN1 or V_IN2) + 0.3V
Maximum Difference Between Any of
V_IN1, V_IN1D, V_IN2, V_CCA, V_CCD ..............................0.3V
PGOOD1, PGOOD2 Voltage.......................... –0.3V to 6V
Operating Junction Temperature Range
(Notes 2, 6, 7)........................................ –40°C to 125°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23
BMC2 1
22 BMC1
TRACK/SS2 2
21 TRACK/SS1
V_FB2 3
I_TH2 4
V_CCD 5
RUN2 6
20 V_FB1
29
19 I_TH1
18 PHASE
17 RUN1
V_IN2 7
16 PGND2
V_IN1 8
15 PGND1
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm s 5mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 34°C/W
EXPOSED PAD (PIN 29) IS GNDD
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3546EUFD#PBF
LTC3546EUFD#TRPBF 3546
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3546IUFD#PBF
LTC3546IUFD#TRPBF 3546
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3546EUFD
LTC3546EUFD#TR
3546
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3546IUFD
LTC3546IUFD#TR
3546
28-Lead (4mm × 5mm) 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_IN = V_CCA = 3.6V, unless otherwise specified. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
V_IN1, V_IN1D, V_IN2, Operating Voltage Range
V_CCA, V_CCD
V_IN1 = V_IN1D = V_IN2 = V_CCA = V_CCD
2.25
5.5
I_FB1, I_FB2
Feedback Pin Input Current
(Note 3)
±0.1
V_FB1, V_FB2
ΔV_LINEREG
ΔV_LOADREG
g_m(EA)
Feedback Voltage
Reference Voltage Line Regulation
%/V is The Percentage Change in V_OUT
with a Change in V_IN
Output Voltage Load Regulation
Error Amplifier Transconductance
(Note 3)
V_IN = 2.25V to 5.5V (Note 3)
I_TH1, I_TH2 = 0.36V (Note 3)
I_TH1, I_TH2 = 0.84V (Note 3)
(Note 3)
l 0.588
0.6
0.612
0.04
0.2
l
0.02
0.2
l
–0.02 –0.2
1400
UNITS
V
μA
V
%/V
%
%
μS
3546f
2