Datasheet

LTC3546
3
3546fc
For more information www.linear.com/3546
elecTrical characTerisTics
The l denotes the specifications which apply over the specified 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 UNITS
V
IN1
, V
IN1D
,
V
IN2,
V
CCA
,
V
CCD
Operating Voltage Range V
IN1
= V
IN1D
= V
IN2
= V
CCA
= V
CCD
2.25 5.5 V
I
FB1
, I
FB2
Feedback Pin Input Current (Note 3) ±0.1 µA
V
FB1
, V
FB2
Feedback Voltage (Note 3)
l
0.588 0.6 0.612 V
ΔV
LINEREG
Reference Voltage Line Regulation
%/V is The Percentage Change in V
OUT
with a Change in V
IN
V
IN
= 2.25V to 5.5V (Note 3) 0.04 0.2 %/V
ΔV
LOADREG
Output Voltage Load Regulation I
TH1
, I
TH2
= 0.36V (Note 3)
I
TH1
, I
TH2
= 0.84V (Note 3)
l
l
0.02
–0.02
0.2
–0.2
%
%
g
m(EA)
Error Amplifier Transconductance (Note 3) 1400 µS
V
TRACK/SS1
,
V
TRACK/SS2
Tracking Voltage Offset V
TRACK/SS1,2
= 0.3V 15 mV
I
TRACK/SS1
,
I
TRACK/SS2
Tracking Current Source V
TRACK/SS1,2
= 0V 0.8 1.15 1.5 µA
I
S
Input DC Supply Current (Note 4)
Active Mode V
FB1
= V
FB2
= 0.55V, V
MODE
= V
IN
,
V
RUN1
= V
RUN2
= V
IN
600 990 µA
Half Active Mode (V
RUN1
= V
IN
, V
RUN2
= 0) V
FB1
= 0.55V, V
MODE
= V
IN
, V
RUN1
= V
IN
,
V
RUN2
= 0V
400 800 µA
Half Active Mode (V
RUN1
= 0, V
RUN2
= V
IN
) V
FB2
= 0.55V, V
MODE
= V
IN
, V
RUN1
= 0V,
V
RUN2
= V
IN
400 800 µA
Both Channels in Sleep Mode V
FB1
= V
FB2
= 0.75V, V
MODE
= V
IN
,
V
RUN1
= V
RUN2
= V
IN
160 300 µA
Shutdown V
RUN1
= V
RUN2
= 0V 0.2 1 µA
f
OSC
Oscillator Frequency V
FREQ
: R
T
= V
IN
V
FREQ
: R
T
= 143k
V
FREQ
: Resistor (Note 5)
l
1.8
1.2
0.75
2.25
1.5
2.9
1.8
4
MHz
MHz
MHz
I
LIM1
Peak Switch Current Limit on SW1 (1A) BMC1 = V
IN
, V
ITH1
= 1.4V
BMC1 = 0.4V, V
ITH1
= 0V
1.4 1.6
0.45
A
A
I
LIM2
Peak Switch Current Limit on SW2A/B (2A) BMC2 = V
IN
, V
ITH1
= 1.4V
BMC2 = 0.4V, V
ITH1
= 0V
2.8 3.2
0.9
A
A
I
LIM1+1D
Peak Switch Current Limit on
SW1 + SW1D (2A)
SW1 Externally Connected to SW1D
BMC1 = V
IN
(Note 8)
BMC1 = 0.4V (Note 8)
2.5 3.2
1.6
A
A
I
LIM2+1D
Peak Switch Current Limit on
SW2A/B + SW1D (3A)
SW2A/B Externally Connected to SW1D
BMC2 = V
IN
(Note 8)
BMC2 = 0.4V (Note 8)
3.75 4.8
2.4
A
A
R
DS(ON)1
SW1 Top Switch On-Resistance (1A)
SW1 Bottom Switch On-Resistance
V
IN2
= 3.6V
V
IN2
= 3.6V
0.19
0.18
Ω
Ω
R
DS(ON)1D
SW1D Top Switch On-Resistance (1A)
SW1D Bottom Switch On-Resistance
V
IN2
= 3.6V
V
IN2
= 3.6V
0.19
0.17
Ω
Ω
R
DS(ON)2
SW2A/B Top Switch On-Resistance (2A)
SW2A/B Bottom Switch On-Resistance
V
IN1
= 3.6V
V
IN1
= 3.6V
0.096
0.085
Ω
Ω
I
SW1(LKG)
Switch Leakage Current SW1 V
IN
= 6V
V
ITH1
= 0V
V
RUN1
= 0V
0.01 1 µA