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LT1680IN#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT1680
High Power DC/DC
Step-Up Controller
■
High Voltage: Operation Up to 60V
■
High Current: N-Channel Drive Handles Up to
10,000pF Gate Capacitance
■
Programmable Average Current Limiting
■
5V Reference Output with 10mA External
Loading Capability
■
Fixed Frequency Current Mode Operation
■
Oscillator Synchronizable Up to 200kHz
■
Undervoltage Lockout with Hysteresis
■
Programmable Start Inhibit for Power Supply
Sequencing and Protection
■
User Adjustable Slope Compensation
The LT
®
1680 is a high power, current mode switching
power supply controller optimized for boost topologies.
The IC drives an N-channel MOSFET switch for DC/DC
converter applications up to 60V input. A high current gate
drive output handles up to 10,000pF gate capacitance,
enabling the construction of high power DC/DC convert-
ers. Current sense common mode range up to 60V allows
current sensing to be referenced to the input supply,
eliminating the need for sense blanking circuits.
The LT1680 incorporates programmable average current
limiting allowing accurate limiting of DC current in the
magnetics, independent of ripple current . User adjustable
slope compensation provides stable operation at duty
cycles up to 90%.
The LT1680 operating frequency is programmable and
can be synchronized up to 200kHz. Minimum off-time
operation provides switch protection. The IC also incorpo-
rates a soft start feature that is gated by both shutdown
and undervoltage lockout conditions.
■
High Power Single Board Systems
■
Distributed Power Converters
■
Industrial Control Systems
■
Lead-Acid Battery Back-Up Systems
■
Automotive and Heavy Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
12V to 48V, 250W Boost Converter
Efficiency vs Output Power
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SL/ADJ
C
T
I
AVG
SS
V
C
SGND
V
FB
V
REF
5V
REF
SYNC
12V
IN
GATE
PGND
RUN/SHDN
SENSE
–
SENSE
+
+
LT1680
MBR0520
R
CT
15k
R7
2k
R
VC
4.7k
C
CT
1nF
C3 220pF
C
VC
4.7nF
C4 0.22µF
C2
1µF
C11 1nF
1680 TA01
C6 0.1µF
R6
75k
R9
100k
C12
1µF
M1
IRFZ44
×3
D1
MBR20100CT
×2
+
C
IN
680µF
25V
×4
C
OUT
680µF
63V
×3
V
OUT
48V
5.2A
L1
25µH
R
SENSE
0.005Ω
12V
IN
10V TO 15V
24A (DC)
+
L1: Kool Mµ
®
, 18T #14 ON 77314-A7
Kool Mµ IS A REGISTERED TRADEMARK OF MAGNETICS, INC.
OUTPUT POWER (W)
0
EFFICIENCY (%)
90
95
100
200
1680 TA02
85
80
75
50
100
150
250
V
OUT
= 48V
2
LT1680
LT1680CN
LT1680CSW
LT1680IN
LT1680ISW
ORDER PART
NUMBER
1
2
3
4
5
6
7
8
TOP VIEW
SW PACKAGE
16-LEAD PLASTIC SO WIDE
N PACKAGE
16-LEAD PDIP
16
15
14
13
12
11
10
9
SL/ADJ
C
T
I
AVG
SS
V
C
SGND
V
FB
V
REF
5V
REF
SYNC
12V
IN
GATE
PGND
RUN/SHDN
SENSE
–
SENSE
+
T
JMAX
= 125°C, θ
JA
= 75°C/ W (N)
T
JMAX
= 125°C, θ
JA
= 90°C/ W (SW)
(Note 1)
Power Supply Voltage (12V
IN
).................. –0.3V to 20V
Sense Amplifier Input Common Mode ...... –0.3V to 60V
GATE Pin Voltage....................... –0.3V to 12V
IN
+ 0.3V
RUN/SHDN Pin Voltage ......................... –0.3V to 12V
IN
All Other Pin Voltages ................................. –0.3V to 7V
5V Reference Output Current............................... 65mA
Operating Ambient Temperature Range
LT1680C.................................................. 0°C to 70°C
LT1680I .............................................. –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Consult factory for parts specified with wider operating temperature ranges.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
12V
IN
= 12V, V
VC
= 2V, V
FB
= V
REF
= 1.25V, C
GATE
= 3000pF, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply and Protection
I
12VIN
DC Active Supply Current (Note 2) Gate Output On ● 15 22 mA
Gate Output Off 12 mA
DC Standby Supply Current V
RUN
< 0.5V ● 150 250 µA
V
RUN/SHDN
Shutdown Rising Threshold ● 1.15 1.25 1.35 V
V
SSHYST
Shutdown Threshold Hysteresis 25 mV
I
SS
Soft Start Charge Current ● 5814 µA
V
UVLO
Undervoltage Lockout Threshold - Falling ● 8.20 9.00 9.75 V
Undervoltage Lockout Threshold - Rising
● 9.35 9.95 V
Undervoltage Lockout Hysteresis ● 200 350 mV
5V Reference
V
REF5
5V Reference Voltage Line, Load and Temperature ● 4.75 5 5.25 V
5V Reference Line Regulation 10V ≤ 12V
IN
≤ 15V ● 3 5 mV/V
I
REF5
5V Reference Load Range - DC ● 10 mA
Pulse
● 20 mA
5V Reference Load Regulation 0 ≤ I
REF5
≤ 20mA ● –1.25 –2 V/A
I
SC
5V Reference Short-Circuit Current 45 mA
Error Amplifier
V
FB
Error Amplifier Reference Voltage Measured at Feedback Pin 1.242 1.250 1.258 V
● 1.235 1.265 V
I
FB
Feedback Input Current V
FB
= V
REF
● 0.1 0.5 1.0 µA
g
m
Error Amplifier Transconductance ● 1200 2000 3200 µmho
A
V
Error Amplifier Voltage Gain ● 1500 3000 V/V
I
VC
Error Amplifier Source Current ● 200 275 µA
Error Amplifier Sink Current V
FB
– V
REF
= 500mV ● 280 400 µA
V
VC
Absolute V
C
Clamp Voltage Measured at V
C
Pin 3.5 V
3
LT1680
Note 2: Supply current specification does not include external FET gate
charge currents. Actual supply currents will be higher and vary with
operating frequency, operating voltages and the type of external FETs used.
See Applications Information.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Error Amplifier
V
SENSE
Peak Current Limit Threshold Measured at Sense Inputs ● 170 190 mV
Average Current Limit Threshold Measured at Sense Inputs, V
CMSENSE
= 10V ● 110 120 130 mV
V
IAVG
Average Current Limit Threshold Measured at I
AVG
Pin 2.5 V
Current Sense Amplifier
A
V
Amplifier DC Gain Measured at I
AVG
Pin 15 V/V
V
OS
Amplifier Input Offset Voltage 2V < V
CMSENSE
< 60V, ● 0.1 mV
SENSE
+
– SENSE
–
= 5mV
I
BIAS
Input Bias Current Sink (V
CMSENSE
> 5V) ● 45 75 µA
Source (V
CMSENSE
= 0V) ● 700 1200 µA
Oscillator
f
O
Operating Frequency, Free Run ● 200 kHz
Frequency Programming Error f
O
≤ 200kHz, R
CT
= 16.9k, C
CT
= 1000pF ● –5 5 %
I
CT
Timing Capacitor Discharge Current LT1680C ● 2.20 2.5 2.75 mA
LT1680I
● 2.10 2.5 2.75 mA
V
SYNC
SYNC Input Threshold Rising Edge ● 0.8 2.0 V
f
SYNC
SYNC Frequency Range f
SYNC
≤ 200kHz ● f
O
1.4f
O
Output Drivers
V
GATE
Undervoltage Output Clamp 12V
IN
≤ 8.2V ● 0.4 0.7 V
Standby Mode Output Clamp V
RUN
< 0.5V ● 0.1 V
Gate Output On Voltage
● 11 11.9 12 V
Gate Output Off Voltage
● 0.4 0.7 V
t
GATER
Gate Output Rise Time ● 60 200 ns
t
GATEF
Gate Output Fall Time ● 60 140 ns
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
12V
IN
= 12V, V
VC
= 2V, V
FB
= V
REF
= 1.25V, C
GATE
= 3000pF, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1680IN#PBF

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Buy LT1680IN#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Hi Pwr DC/DC Boost Cntr
Lifecycle:
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