LTC3115-1 Datasheet PDF - Linear Technology Corporation


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LTC3115-1
Linear Technology Corporation

Part Number LTC3115-1
Description 2A Synchronous Buck-Boost DC/DC Converter
Page 30 Pages

LTC3115-1 datasheet pdf
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Features
n Wide VIN Range: 2.7V to 40V
n Wide VOUT Range: 2.7V to 40V
n 1A Output Current for VIN ≥ 3.6V, VOUT = 5V
n 2A Output Current in Step-Down Operation
for VIN ≥ 6V
n Programmable Frequency: 100kHz to 2MHz
n Synchronizable Up to 2MHz with an External Clock
n Up to 95% Efficiency
n 30µA No-Load Quiescent Current in Burst Mode®
Operation
n Ultralow Noise Buck-Boost PWM
n Internal Soft-Start
n 3µA Supply Current in Shutdown
n Programmable Input Undervoltage Lockout
n Small 4mm × 5mm × 0.75mm DFN Package
n Thermally Enhanced 20-Lead TSSOP Package
Applications
n 24V/28V Industrial Applications
n Automotive Power Systems
n Telecom, Servers and Networking Equipment
n FireWire Regulator
n Multiple Power Source Supplies
LTC3115-1
40V, 2A Synchronous
Buck-Boost DC/DC
Converter
Description
The LTC®3115-1 is a high voltage monolithic synchronous
buck-boost DC/DC converter. Its wide 2.7V to 40V input and
output voltage ranges make it well suited to a wide variety
of automotive and industrial applications. A proprietary
low noise switching algorithm optimizes efficiency with
input voltages that are above, below or even equal to the
output voltage and ensures seamless transitions between
operational modes.
Programmable frequency PWM mode operation provides
low noise, high efficiency operation and the ability to syn-
chronize switching to an external clock. Switching frequen-
cies up to 2MHz are supported to allow use of small value in-
ductors for miniaturization of the application circuit. Pin se-
lectable Burst Mode operation reduces standby current and
improves light load efficiency which, combined with a 3µA
shutdown current, make the LTC3115-1 ideally suited for
battery-powered applications. Additional features include
output disconnect in shutdown, short-circuit protection
and internal soft-start. The LTC3115-1 is available in ther-
mally enhanced 16-lead 4mm × 5mm × 0.75mm DFN and
20‑lead TSSOP packages.
L, LT, LTC, LTM, Burst Mode, LTspice, Linear Technology and the Linear logo are registered
trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
6404251, 6166527 and others pending.
Typical Application
10µH
0.1µF
0.1µF
2.7V TO
40V
4.7µF
BURST PWM
OFF ON
47.5k
BST1 SW1
SW2 BST2
PVIN
PVOUT
VIN
LTC3115-1
PWM/SYNC
RUN
RT
GND
PGND
VC
FB
PVCC
VCC
47µF
60.4k3300pF
4.7µF
5V
1A VIN > 3.6V
2A VIN ≥ 6V
1M 33pF
15k
249k
(OPTIONAL)
3115 TA01a
For more information www.linear.com/LTC3115-1
Efficiency vs VIN
95
ILOAD = 0.5A
90
ILOAD = 1A
85
80
75
70
2
10
INPUT VOLTAGE (V)
VOUT = 5V
40
31151 TA01b
31151fa
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LTC3115-1
Absolute Maximum Ratings (Note 1)
VIN, PVIN, PVOUT......................................... –0.3V to 45V
VSW1
DC............................................ –0.3V to (PVIN + 0.3V)
Pulsed (<100ns).......................–1.5V to (PVIN + 1.5V)
VSW2
DC..........................................–0.3V to (PVOUT + 0.3V)
Pulsed (<100ns)..................... –1.5V to (PVOUT + 1.5V)
VRUN.............................................. –0.3V to (VIN + 0.3V)
VBST1......................................VSW1 – 0.3V to VSW1 + 6V
VBST2......................................VSW2 – 0.3V to VSW2 + 6V
VPWM/SYNC.................................................... –0.3V to 6V
Voltage, All Other Pins.................................. –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 4)
LTC3115E-1/LTC3115I-1...................... –40°C to 125°C
LTC3115H-1........................................ –40°C to 150°C
LTC3115MP-1...................................... –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
FE...................................................................... 300°C
Pin Configuration
TOP VIEW
RUN
SW2
PVOUT
GND
GND
VC
FB
RT
1
2
3
4
5
6
7
8
PGND
17
16 PWM/SYNC
15 SW1
14 PVIN
13 BST1
12 BST2
11 PVCC
10 VIN
9 VCC
DHD PACKAGE
16-LEAD (5mm × 4mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 4.3°C/W
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
PGND 1
RUN 2
SW2 3
PVOUT 4
GND 5
GND 6
VC 7
FB 8
RT 9
PGND 10
TOP VIEW
21
PGND
20 PGND
19 PWM/SYNC
18 SW1
17 PVIN
16 BST1
15 BST2
14 PVCC
13 VIN
12 VCC
11 PGND
FE PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 38°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 21) IS PGND, MUST BE SOLDERED
TO PCB FOR RATED THERMAL PERFORMANCE
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3115EDHD-1#PBF
LTC3115EDHD-1#TRPBF 31151
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 125°C
LTC3115IDHD-1#PBF
LTC3115EFE-1#PBF
LTC3115IDHD-1#TRPBF 31151
LTC3115EFE-1#TRPBF LTC3115FE-1
16-Lead (5mm × 4mm) Plastic DFN
20-Lead Plastic TSSOP
–40°C to 125°C
–40°C to 125°C
LTC3115IFE-1#PBF
LTC3115IFE-1#TRPBF LTC3115FE-1
20-Lead Plastic TSSOP
–40°C to 125°C
LTC3115HFE-1#PBF
LTC3115HFE-1#TRPBF LTC3115FE-1
20-Lead Plastic TSSOP
–40°C to 150°C
LTC3115MPFE-1#PBF
LTC3115MPFE-1#TRPBF LTC3115FE-1
20-Lead Plastic TSSOP
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
31151fa
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LTC3115-1
E lectrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are for TA = 25°C (Note 2). PVIN = VIN = 24V, PVOUT = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Operating Voltage
l 2.7
40 V
Output Operating Voltage
l 2.7
40 V
Input Undervoltage Lockout Threshold
Input Undervoltage Lockout Hysteresis
VIN Falling
VVIINN
Rising
Rising
(0°C
to
125°C)
l
2.4 2.7
V
l
2.6 2.8
V
2.725
V
100 mV
VCC Undervoltage Lockout Threshold
VCC Undervoltage Lockout Hysteresis
Input Current in Shutdown
Input Quiescent Current in Burst Mode Operation
Oscillator Frequency
Oscillator Operating Frequency
PWM/SYNC Clock Input Frequency
VCC Falling
VRUN = 0V
VFB = 1.1V (Not Switching), VPWM/SYNC = Low
RT = 35.7k, VPWM/SYNC = High
VPWM/SYNC = High
l
l 900
l 100
l 100
2.4 2.6
200
3 10
50
1000 1100
2000
2000
V
mV
µA
µA
kHz
kHz
kHz
PWM/SYNC Input Logic Threshold
l 0.5 1.0 1.5
V
Soft-Start Duration
9 ms
Feedback Voltage
l 977 1000 1017
mV
Feedback Voltage Line Regulation
Feedback Pin Input Current
VIN = 2.7V to 40V
0.1
1 50
%
nA
RUN Pin Input Logic Threshold
l 0.3 0.8 1.1
V
RUN Pin Comparator Threshold
RUN Pin Hysteresis Current
VRUN Rising
l 1.16 1.21 1.26
500
V
nA
RUN Pin Hysteresis Voltage
100 mV
Inductor Current Limit
(Note 3)
l 2.4 3.0 3.7
A
Reverse Inductor Current Limit
Burst Mode Inductor Current Limit
Current into PVOUT (Note 3)
(Note 3)
1.5
0.65 1.0 1.35
A
A
Maximum Duty Cycle
Minimum Duty Cycle
SW1, SW2 Minimum Low Time
N-Channel Switch Resistance
N-Channel Switch Leakage
PVCC/VCC External Forcing Voltage
VCC Regulation Voltage
VCC Load Regulation
VCC Line Regulation
VCC Current Limit
VCC Dropout Voltage
VCC Reverse Current
Percentage of Period SW2 is Low in Boost Mode,
RT = 35.7k (Note 5)
Percentage of Period SW1 is High in Buck Mode,
RT = 35.7k (Note 5)
RT = 35.7k (Note 5)
Switch A (From PVIN to SW1)
Switch B (From SW1 to PGND)
Switch C (From SW2 to PGND)
Switch D (From PVOUT to SW2)
PVIN = PVOUT = 40V
IVCC = 1mA
IVCC = 1mA to 20mA
IVCC = 1mA, VIN = 5V to 40V
VCC = 2.5V
IVCC = 5mA, VIN = 2.7V
VCC = 5V, VIN = 3.6V
l 90
95
l0
100
150
150
150
150
0.1 10
4.58 5.5
4.33 4.45 4.58
1.2
0.5
50 110
50
10
%
%
ns
µA
V
V
%
%
mA
mV
µA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
125°C operating junction temperature range are ensured by design,
may cause permanent damage to the device. Exposure to any Absolute
characterization and correlation with statistical process controls. The
Maximum Rating condition for extended periods may affect device
LTC3115I-1 specifications are guaranteed over the –40°C to 125°C
reliability and lifetime.
operating junction temperature range. The LTC3115H-1 specifications are
Note 2: The LTC3115-1 is tested under pulsed load conditions such
that TJ ≈ TA. The LTC3115E-1 is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
guaranteed over the –40°C to 150°C operating junction temperature range.
The LTC3115MP-1 specifications are guaranteed over the –55°C to 150°C
operating junction temperature range. High junction temperatures degrade
31151fa
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LTC3115-1
Electrical Characteristics
operating lifetime; operating lifetime is derated for junction temperatures
greater than 125°C. The maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.
The junction temperature (TJ in °C) is calculated from the ambient
temperature (TA in °C) and power dissipation (PD in Watts) according to
the following formula:
TJ = TA + (PD θJA)
where θJA is the thermal impedance of the package.
Note 3: Current measurements are performed when the LTC3115-1 is
not switching. The current limit values measured in operation will be
somewhat higher due to the propagation delay of the comparators.
Note 4: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 5: Switch timing measurements are made in an open-loop test
configuration. Timing in the application may vary somewhat from these
values due to differences in the switch pin voltage during the non-overlap
durations when switch pin voltage is influenced by the magnitude and
direction of the inductor current.
Typical Performance Characteristics (TA = 25°C unless otherwise specified)
PWM Mode Efficiency, VOUT = 5V,
fSW = 500kHz, Non-Bootstrapped
100
90
80
70
60
50
40
30
20
0.01
VIN = 3.6V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
0.10
LOAD CURRENT (A)
1
31151 G01
PWM Mode Efficiency, VOUT = 5V,
fSW = 1MHz, Non-Bootstrapped
100
90
80
70
60
50
40
30
20
0.01
VIN = 3.6V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
0.1
LOAD CURRENT (A)
1
31151 G04
4
PWM Mode Efficiency,
VOUT = 12V, fSW = 500kHz
100
90
80
70
60
50
40
30
0.01
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
0.1
LOAD CURRENT (A)
1
31151 G02
PWM Mode Efficiency,
VOUT = 12V, fSW = 1MHz
100
90
80
70
60
50
40
30
0.01
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
0.1
LOAD CURRENT (A)
1
31151 G05
For more information www.linear.com/LTC3115-1
PWM Mode Efficiency,
VOUT = 24V, fSW = 500kHz
100
90
80
70
60
50
40
30
0.01
VIN = 12V
VIN = 18V
VIN = 24V
VIN = 36V
0.1
LOAD CURRENT (A)
1
31151 G03
PWM Mode Efficiency,
VOUT = 24V, fSW = 1MHz
100
90
80
70
60
50
40
30
0.01
VIN = 12V
VIN = 18V
VIN = 24V
VIN = 36V
0.1
LOAD CURRENT (A)
1
31151 G06
31151fa




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