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LTC1143LCS#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LTC1143/LTC1143L
LTC1143L-ADJ
■
Dual Outputs
LTC1143, LTC1143L: 3.3V, 5V
LTC1143L-ADJ: Dual Adjustable
■
Very High Efficiency: Over 95% Possible
■
Current Mode Operation for Excellent Line and Load
Transient Response
■
High Efficiency Maintained over Three Decades of
Output Current
■
Low Standby Current at Light Loads: 160µA/Output
■
Logic-Controlled Shutdown (LTC1143, LTC1143L)
■
Wide V
IN
Range: 3.5V to 16V
(LTC1143L, LTC1143L-ADJ)
■
Very Low Dropout Operation: 100% Duty Cycle
■
Available in Narrow 16-Pin SO Package
The LTC1143 series is a dual step-down switching regulator
controller featuring automatic Burst Mode
TM
operation to
maintain high efficiencies at low output currents. This
device is composed of two separate regulator blocks,
each driving an external power MOSFET at switching
frequencies up to 400kHz using a constant off-time current
mode architecture. Both fixed and adjustable voltages are
available.
The operating current level for both regulators is user-
programmable via an external current sense resistor.
Wide input supply range allows operation from 4V to 14V
(16V maximum). The LTC1143L and LTC1143L-ADJ
extend operation to V
IN
= 3.5V. 100% duty cycle provides
low dropout regulation limited only by the R
DS(ON)
of the
external MOSFET and resistance of the inductor and
current sense resistor.
The LTC1143 series is ideal for applications requiring dual
output voltages with high conversion efficiencies over a
wide load current range in a small amount of board space.
DESCRIPTION
U
FEATURES
Figure 1. High Efficiency Dual 3.3V/2.5V Regulator
1000pF
100pF
+
+
+
1000pF
P-DRIVE 1
SENSE
+
1
SENSE
–
1
V
FB1
V
FB2
GND1
C
T1
I
TH1
I
TH2
C
T2
GND2
SENSE
–
2
SENSE
+
2
P-DRIVE 2
V
IN1
V
IN2
LTC1143L-ADJ
C
T2
300pF
3
2
14
15
7
611
R
C2
1k
C
C1
3300pF
C
C2
3300pF
C
T1
300pF
R
C1
1k
0.22µF
13 5
12
9
8
10
4
1
16
V
OUT2
2.5V/2A
C
OUT2
220µF
10V
× 2
R
SENSE2
0.05Ω
P1B
L2
27µH
D2
MBRS320T3
0.22µF
C
IN2
22µF
25V
× 2
C
IN1
22µF
25V
× 2
P1A
D1
MBRS320T3
C
OUT1
220µF
10V
× 2
L1
27µH
R
SENSE1
0.05Ω
R2
82.5k
1%
R1
49.9k
1%
V
OUT1
3.3V/2A
R3
49.9k
1%
R4
49.9k
1%
V
IN
4V TO 14V
1143 F01
+
L1, L2: SUMIDA CDRH125-270
P1: SILICONIX Si4953DY/FAIRCHILD NDS8947
R
SENSE1,
R
SENSE2
: DALE WSL-2010-.05
100pF
Burst Mode is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Dual High Efficiency SO-16
Step-Down Switching Regulator
Controllers
TYPICAL APPLICATION
U
APPLICATIONS
U
■
Personal Digital Assistants
■
Notebook and Palmtop Computers
■
Battery-Operated Digital Devices
■
Portable Instruments
■
DC Power Distribution Systems
2
LTC1143/LTC1143L
LTC1143L-ADJ
ABSOLUTE MAXIMUM RATINGS
W
WW
U
Input Supply Voltage (Pins 5,13)...............16V to –0.3V
Continuous Output Current (Pins 4,12) ................ 50mA
Sense Voltages (Pins 1, 8, 9, 16)
V
IN
≥ 12.7V .......................................... 13V to –0.3V
V
IN
< 12.7V .............................. (V
IN
+ 0.3V) to – 0.3V
Shutdown Voltage
(LTC1143, LTC1143L, Pins 2, 10)...........7V to –0.3V
V
FB
Current (LTC1143L-ADJ, Pins 2, 10) ............... 1mA
Operating Temperature Range
Ambient .................................................. 0°C to 70°C
Extended Commercial (Note 4) ...........–40°C to 85°C
Junction Temperature (Note 1)............................. 125°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
LTC1143CS
LTC1143LCS
ORDER PART
NUMBER
LTC1143LCS-ADJ
T
JMAX
= 125°C, θ
JA
= 95°C/W
ELECTRICAL CHARACTERISTICS
T
A
= 25
°
C, V
IN
= 10V unless otherwise noted.
Consult factory for Industrial and Military grade parts.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
2
, V
10
Feedback Voltage (LTC1143L-ADJ) V
IN
= 9V ● 1.21 1.25 1.29 V
I
2
, I
10
Feedback Current (LTC1143L-ADJ) ● 0.2 1 µA
V
OUT
Regulated Output Voltage (LTC1143/LTC1143L) V
IN3,
V
IN5
= 9V, V
2
= V
10
= 0V
3.3V Output I
LOAD
= 700mA ● 3.23 3.33 3.43 V
5V Output I
LOAD
= 700mA ● 4.90 5.05 5.20 V
∆V
OUT
Output Voltage Line Regulation V
IN
= 7V to 12V, I
LOAD
= 50mA –40 0 40 mV
Output Voltage Load Regulation V
2
= V
10
= 0V
LTC1143/LTC1143L
3.3V Output 5mA < I
LOAD
< 2.0A ● 40 65 mV
5V Output 5mA < I
LOAD
< 2.0A ● 60 100 mV
Output Ripple (Burst Mode) I
LOAD
= 0A 50 mV
P-P
I
5
, I
13
Input DC Supply Current (Note 2)
LTC1143: Normal Mode V
2
= V
10
= 0V, 4V < V
IN
< 12V 1.6 2.1 mA
Sleep Mode V
2
= V
10
= 0V, 4V < V
IN3
< 12V, 6V < V
IN5
< 12V 160 230 µA
Shutdown V
2
= V
10
= 2.1V, 4V < V
IN
< 12V 10 20 µA
LTC1143L: Normal Mode V
2
= V
10
= 0V, 3.5V < V
IN
< 12V 1.6 2.1 mA
Sleep Mode V
2
= V
10
= 0V, 3.5V < V
IN3
< 12V, 6V < V
IN5
< 12V 160 230 µA
Shutdown V
2
= V
10
= 2.1V, 3.5V < V
IN
< 12V 10 20 µA
LTC1143L-ADJ: Normal Mode 3.5V < V
IN
< 12V 1.6 2.1 mA
Sleep Mode 3.5V < V
IN
< 12V, V
OUT
≤ 3.3V 160 230 µA
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SENSE
+
1
V
FB1
GND1
P-DRIVE 1
V
IN2
C
T2
I
TH2
SENSE
–
2
SENSE
–
1
I
TH1
C
T1
V
IN1
P-DRIVE 2
GND2
V
FB2
SENSE
+
2
T
JMAX
= 125°C, θ
JA
= 95°C/W
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SENSE
+
3
SHUTDOWN 3
GND3
P-DRIVE 3
V
IN5
C
T5
I
TH5
SENSE
–
5
SENSE
–
3
I
TH3
C
T3
V
IN3
P-DRIVE 5
GND5
SHUTDOWN 5
SENSE
+
5
3
LTC1143/LTC1143L
LTC1143L-ADJ
ELECTRICAL CHARACTERISTICS
T
A
= 25
°
C, V
IN
= 10V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
1
to V
16
, Current Sense Threshold Voltage
V
8
to V
9
LTC1143/LTC1143L V
2
= V
10
= 0V
V
SENSE
–
= V
OUT
+ 100mV (Forced) 25 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) ● 130 150 170 mV
LTC1143L-ADJ V
SENSE
–
= 5V, V
FB
= V
OUT
/4 + 25mV (Forced) 25 mV
V
SENSE
–
= 5V, V
FB
= V
OUT
/4 – 25mV (Forced) ● 130 150 170 mV
V
2
, V
10
Shutdown Pin Threshold 0.5 0.8 2 V
LTC1143/LTC1143L
I
2
, I
10
Shutdown Pin Input Current 0V < V
SHUTDOWN
= < 8V, V
IN3,
V
IN5
= 16V 1.2 5 µA
LTC1143/LTC1143L
I
6
, I
14
C
T
Pin Discharge Current V
OUT
in Regulation, V
SENSE-
= V
OUT
50 70 90 µA
V
OUT
= 0V 2 10 µA
t
OFF
Off-Time (Note 3) C
T
= 390pF, I
LOAD
= 700mA 4 5 6 µs
t
r
, t
f
Driver Output Transition Times C
L
= 3000pF (Pins 4, 12), V
IN
= 6V 100 200 ns
–40
°
C ≤ T
A
≤ 85
°
C (Note 4), V
IN
= 10V unless otherwise noted.
V
2
, V
10
Feedback Voltage (LTC1143L-ADJ) V
IN
= 9V 1.20 1.25 1.30 V
V
OUT
Regulated Output Voltage V
IN3,
V
IN5
= 9V
LTC1143/LTC1143L
3.3V Output I
LOAD
= 700mA 3.17 3.33 3.43 V
5V Output I
LOAD
= 700mA 4.85 5.05 5.20 V
I
5
, I
13
Input DC Supply Current (Note 2)
LTC1143: Normal Mode V
2
= V
10
= 0V, 4V < V
IN
< 12V 1.6 2.4 mA
Sleep Mode V
2
= V
10
= 0V, 4V < V
IN3
< 12V, 6V < V
IN5
< 12V 160 260 µA
Shutdown V
2
= V
10
= 2.1V, 4V < V
IN
< 12V 10 22 µA
LTC1143L: Normal Mode V
2
= V
10
= 0V, 3.5V < V
IN
< 12V 1.6 2.4 mA
Sleep Mode V
2
= V
10
= 0V, 3.5V < V
IN3
< 12V, 6V < V
IN5
< 12V 160 260 µA
Shutdown V
2
= V
10
= 2.1V, 3.5V < V
IN
< 12V 10 22 µA
LTC1143L-ADJ: Normal Mode 3.5V < V
IN
< 12V 1.6 2.4 mA
Sleep Mode 3.5V < V
IN
< 12V, V
OUT
≤ 3.3V 160 260 µA
V
1
to V
16
, Current Sense Threshold Voltage
V
8
to V
9
LTC1143/LTC1143L V
2
= V
10
= 0V
V
SENSE
–
= V
OUT
+ 100mV (Forced) 25 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) 125 150 185 mV
LTC1143L-ADJ V
SENSE
–
= 5V, V
FB
= V
OUT
/4 + 25mV (Forced) 25 mV
V
SENSE
–
= 5V, V
FB
= V
OUT
/4 – 25mV (Forced) 125 150 185 mV
V
2
, V
10
Shutdown Pin Threshold 0.55 0.8 2 V
LTC1143/LTC1143L
The ● denotes specifications which apply over the specified temperature
range.
Note 1: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
LTC1143 series: T
J
= T
A
+ (P
D
• 125°C/W)
Note 2: This supply current is for one regulator block. Total supply
current is the sum of Pin 5 and Pin 13 currents. Dynamic supply current
is higher due to the gate charge being delivered at the switching
frequency. See Applications Information.
Note 3: In applications where R
SENSE
is placed at ground potential, the
off-time increases approximately 40%.
Note 4: The LTC1143 series is guaranteed to meet specified performance
from 0°C to 70°C and is designed, characterized and expected to meet
these extended temperature limits, but is not tested at –40°C to 85°C.
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LTC1143LCS#PBF

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Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2x Hi Eff SO-16 Buck Sw Reg Cntrs
Lifecycle:
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