Step-Up Controller. LT1680 Datasheet

LT1680 Controller. Datasheet pdf. Equivalent

Part LT1680
Description High Power DC/DC Step-Up Controller
Feature LT1680 High Power DC/DC Step-Up Controller FEATURES s s DESCRIPTION The LT ®1680 is a high power, c.
Manufacture Linear Technology
Datasheet
Download LT1680 Datasheet




LT1680
LT1680
High Power DC/DC
Step-Up Controller
FEATURES
s High Voltage: Operation Up to 60V Max
s High Current: N-Channel Drive Handles Up to
10,000pF Gate Capacitance
s Programmable Average Current Limiting
s 5V Reference Output with 10mA External
Loading Capability
s Fixed Frequency Current Mode Operation
s Oscillator Synchronizable Up to 200kHz
s Undervoltage Lockout with Hysteresis
s Programmable Start Inhibit for Power Supply
Sequencing and Protection
s User Adjustable Slope Compensation
U
APPLICATIONS
s High Power Single Board Systems
s Distributed Power Converters
s Industrial Control Systems
s Lead-Acid Battery Back-Up Systems
s Automotive and Heavy Equipment
DESCRIPTION
The LT®1680 is a high power, current mode switching
power supply controller optimized for boost topologies.
The IC drives N-channel MOSFET switches for DC/DC
converters in applications up to 60V input. A high current
gate drive output handles up to 10,000pF gate capaci-
tance, enabling the construction of high power DC/DC
converters. 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
12V to 48V, 250W Boost
C2
1µF
RCT
CCT 15k
1nF
C3 2.2nF
C4 0.22µF
CVC 4.7nF 1N914
RVC 4.7k
C6 0.1µF
R7
2k
12VIN
10V TO 15V
24A (DC)
RSENSE
0.005
LT1680
1
SL/ADJ
2
CT
3
IAVG
4
SS
5VREF
SYNC
12VIN
GATE
16
15
14
13
5 12
VC PGND
6 11
SGND RUN/SHDN
R9
100k
7
VFB
8
VREF
SENSE 10
SENSE + 9
R6
75k
+ CIN
680µF
25V
×4
+
C12
1µF
L1
25µH
M1
IRFZ44
×3
MBR0520
C11 1nF
D1
MBR20100CT
×2
L1: Kool Mµ®, 18T #14 ON 77314-A7
Kool Mµ IS A REGISTERED TRADEMARK OF MAGNETICS, INC.
+
VOUT
48V
COUT 5.2A
680µF
63V
× 3 1680 TA01
Efficiency vs Output Power
100
VOUT = 48V
95
90
85
80
75
0
50 100 150 200
OUTPUT POWER (W)
250
1680 TA02
1



LT1680
LT1680
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Power Supply Voltage (12VIN) .................. – 0.3V to 20V
Sense Amplifier Input Common Mode ...... – 0.3V to 60V
GATE Pin Voltage....................... – 0.3V to 12VIN + 0.3V
RUN/SHDN Pin Voltage ......................... – 0.3V to 12VIN
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
PACKAGE/ORDER INFORMATION
TOP VIEW
SL/ADJ 1
CT 2
IAVG 3
SS 4
VC 5
SGND 6
VFB 7
VREF 8
16 5VREF
15 SYNC
14 12VIN
13 GATE
12 PGND
11 RUN/SHDN
10 SENSE
9 SENSE +
N PACKAGE
16-LEAD PDIP
SW PACKAGE
16-LEAD PLASTIC SO WIDE
TJMAX = 125°C, θJA = 75°C/ W (N)
TJMAX = 125°C, θJA = 90°C/ W (SW)
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1680CN
LT1680CSW
LT1680IN
LT1680ISW
ELECTRICAL CHARACTERISTICS
12VIN = 12V, VVC = 2V, VFB = VREF = 1.25V, CGATE = 3000pF, TA = 25°C unless otherwise noted.
SYMBOL PARAMETER
Supply and Protection
I12VIN
DC Active Supply Current (Note 2)
DC Standby Supply Current
VRUN/SHDN Shutdown Rising Threshold
VSSHYST Shutdown Threshold Hysteresis
ISS Soft Start Charge Current
VUVLO
Undervoltage Lockout Threshold - Falling
Undervoltage Lockout Threshold - Rising
Undervoltage Lockout Hysteresis
5V Reference
VREF5
5V Reference Voltage
5V Reference Line Regulation
IREF5 5V Reference Load Range - DC
Pulse
5V Reference Load Regulation
ISC 5V Reference Short-Circuit Current
Error Amplifier
VFB Error Amplifier Reference Voltage
CONDITIONS
Gate Output On
Gate Output Off
VRUN < 0.5V
Line, Load and Temperature
10V 12VIN 15V
0 IREF5 20mA
Measured at Feedback Pin
IFB Feedback Input Current
gm Error Amplifier Transconductance
AV Error Amplifier Voltage Gain
IVC Error Amplifier Source Current
Error Amplifier Sink Current
VVC Absolute VC Clamp Voltage
VFB = VREF
VFB – VREF = 500mV
Measured at VC Pin
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
MIN
1.15
5
8.20
200
4.75
1.242
1.235
0.1
1200
1500
200
280
TYP
15
12
65
1.25
15
8
9.00
9.35
350
5
3
– 1.25
45
1.250
0.5
2000
3000
275
400
3.5
MAX
22
110
1.35
14
9.75
9.95
5.25
5
10
20
–2
1.258
1.265
1.0
3200
UNITS
mA
mA
µA
V
mV
µA
V
V
mV
V
mV/V
mA
mA
V/A
mA
V
V
µA
µmho
V/V
µA
µA
V
2







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