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LT3487EDD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT3487
4
3487f
Positive Channel Switch V
CE(SAT)
Positive Channel Schottky I-V
Characteristic
Negative Channel Schottky I-V
Characteristic
Output Disconnect Voltage Drop
(50mA Load)
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Negative Channel Switch V
CE(SAT)
FBN Voltage
FBP Bias Current FBN Bias Current
TEMPERATURE (°C)
–50
V
FBN
(mV)
7.5
25
3487 G04
0
–5.0
–25 0 50
–7.5
–10.0
10.0
5.0
2.5
–2.5
75 100 125
TEMPERATURE (°C)
–50
24.0
I
FBP
(µA)
24.5
25.0
25.5
26.0
–25 0 25 50
3487 G05
75 100 125
TEMPERATURE (°C)
–50
24.0
I
FBN
(µA)
24.5
25.0
25.5
26.0
–25 0 25 50
3487 G06
75 100 125
SWITCH CURRENT (mA)
0
0
POSITIVE SWITCH SATURATION VOLTAGE (mV)
100
200
300
400
500
100
200 300 400
3487 G07
500 600
SWITCH CURRENT (mA)
0
0
NEGATIVE SWITCH SATURATION VOLTAGE (mV)
100
300
400
500
200
400
500 900
3487 G08
200
100 300
600
700
800
SCHOTTKY FORWARD DROP (mV)
600
0
POSITIVE SCHOTTKY FORWARD CURRENT (mA)
100
200
300
400
700 800
900
1000
3487 G09
500
600
650 750
850
950
SCHOTTKY FORWARD DROP (mV)
600
NEGATIVE SCHOTTKY FORWARD CURRENT (mA)
400
600
1000
3487 G10
200
0
700
800
900
650
750
850
950
800
300
500
100
700
TEMPERATURE (°C)
–50
100
V
CAP
– V
POS
(mV)
150
200
250
300
–25 0 25 50
3487 G11
75 100 125
V
CAP
– V
BAT
(V)
0
100
120
140
10
3487 G20
80
60
2.5 5 7.5 12.5
40
20
0
I
CAP
(mA)
V
CAP
– V
POS
= 500mV
T
A
= 25°C
Maximum Disconnect Current
LT3487
5
3487f
TEMPERATURE (°C)
–50
I
RUN/SS
(µA)
2.0
2.5
3.0
25 75
3487 G16
1.5
1.0
–25 0
50 100 125
0.5
0
V
IN
(V)
2
0
RUN/SS PIN CURRENT (µA)
0.5
1.0
1.5
2.0
46810
3487 G17
12 14 16
Output Disconnect Current Limit
Switch Current Limits
Switch Current Limits
vs Duty Cycle
Switch Current Limits vs RUN/SS
Voltage (at 55% Duty Cycle)
RUN/SS Pin Current in Shutdown
TYPICAL PERFOR A CE CHARACTERISTICS
UW
RUN/SS Pin Current
vs V
IN
in Shutdown
UVLO Voltage
TEMPERATURE (°C)
–50
100
CURRENT LIMIT (mA)
125
150
175
200
–25 0 25 50
3487 G12
75 100 125
V
CAP
= 15V
V
BAT
= 3.6V
V
POS
= 0V
TEMPERATURE (°C)
–50
CURRENT LIMITS (mA)
1150
25
3487 G13
1000
900
–25 0 50
850
800
1200
1100
1050
950
75 100 125
NEG CHANNEL
POS CHANNEL
DUTY CYCLE (%)
0
0
CURRENT LIMITS (mA)
200
400
600
800
1000
1200
20 40 60 80
3487 G14
100
NEG CHANNEL
P0S CHANNEL
RUN/SS (mV)
0
0
CURRENT LIMITS (mA)
200
400
600
800
1000
250
500 750 1000
3487 G15
1250 1500
NEG CHANNEL
P0S CHANNEL
TEMPERATURE (°C)
–50 –25
2.0
UVLO (V)
2.2
2.5
0
50
75
3487 G18
2.1
2.4
2.3
25
100
125
TEMPERATURE (°C)
–50
V
RUN/SS
(mV)
200
250
300
25 75
3487 G19
150
100
–25 0
50 100 125
50
0
RUN/SS Shutdown Threshold
LT3487
6
3487f
PI FU CTIO S
UUU
CAP (Pin 1): Disconnect-PNP Emitter and Positive Schottky
Cathode. Acts as an intermediate positive (boost) output.
Connect boost output capacitor to this pin.
SWP (Pin 2): Switch Pin and Schottky Anode for Positive
Channel. Connect boost inductor to this pin.
V
BAT
(Pin 3): Battery Voltage. Connect this pin to the sup-
ply voltage for the boost inductor. The disconnect drive
current is returned to this pin. The disconnect operates
until CAP falls to 1.2V above V
BAT
.
SWN (Pin 4): Switch Pin for Negative (Inverter) Chan-
nel. Connect inverter input inductor and fl ying capacitor
here.
DN (Pin 5): Anode of Internal Schottky for Inverter. Connect
inverter output inductor and fl ying capacitor here.
V
IN
(Pin 6): Input Supply Pin. V
IN
is used to power the
control circuitry of the LT3487. This pin must be locally
bypassed with an X5R or X7R type ceramic capacitor.
FBN (Pin 7): Feedback Pin for Inverter. Connect feedback
resistor R2 from this pin to V
NEG
. Choose R2 according
to:
R
V
µA
NEG
2
25
= –
Pin voltage = 0V when regulated.
RUN/SS (Pin 8): Run/Soft-Start Pin. Connect to an open-
drain transistor. The transistor must sink 1.4µA from
RUN/SS. Pull RUN/SS below 100mV to shut down the chip.
Connect a capacitor from RUN/SS to ground to program
soft-start functionality. The soft-start will slowly bring the
boost channel into regulation and then slowly bring up
the inverter. RUN/SS must be above 1.6V to allow both
channels to reach full current. If soft-start is not required,
this pin can be driven with a logic signal, but the RUN/SS
voltage must remain below V
IN
.
FBP (Pin 9): Feedback Pin for Boost. Connect boost
feedback resistor R1 from FBP to CAP. Choose R1 ac-
cording to:
R
V
µA
POS
1
123
25
=
–.
Pin voltage = 1.23V when regulated.
V
POS
(Pin 10): Output Pin for Boost Channel. V
POS
is
the collector of the output disconnect PNP. Connect the
boost load to V
POS
. Connect capacitor C5 between CAP
and V
POS
for stability.
Exposed Pad (Pin 11): GND. Tie directly to ground plane
through multiple vias under the package for optimum
thermal performance.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT3487EDD#TRPBF

Mfr. #:
Buy LT3487EDD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2MHz, Boost /Inverting DC/DC Converter for CCD Bias in DFN
Lifecycle:
New from this manufacturer.
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