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LT1339ISW#PBF

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1
LT1339
sn1339 1339fas
High Power Synchronous
DC/DC Controller
DESCRIPTION
U
FEATURES
The LT
®
1339 is a high power synchronous current mode
switching regulator controller. The IC drives dual
N-channel MOSFETs to create a single IC solution for high
power DC/DC converters in applications up to 60V.
The LT1339 incorporates programmable average current
limiting, allowing accurate limiting of DC load current
independent of inductor ripple current. The IC also incor-
porates user-adjustable slope compensation for minimi-
zation of magnetics at duty cycles up to 90%.
The LT1339 timing oscillator operating frequency is pro-
grammable and can be synchronized up to 150kHz. Mini-
mum off-time operation provides main switch protection.
The IC also incorporates a soft start feature that is gated by
both shutdown and undervoltage lockout conditions.
An output phase reversal pin allows flexibility in configu-
ration of converter types, including inverting and negative
topologies.
■
High Voltage: Operation Up to 60V
■
High Current: Dual N-Channel Synchronous Drive
Handles Up to 10,000pF Gate Capacitance
■
Programmable Average Load Current Limiting
■
5V Reference Output with 10mA External
Loading Capability
■
Programmable Fixed Frequency Synchronizable
Current Mode Operation Up to 150kHz
■
Undervoltage Lockout with Hysteresis
■
Programmable Start Inhibit for Power Supply
Sequencing and Protection
■
Adaptive Nonoverlapping Gate Drive Prevents
Shoot-Through
■
48V Telecom Power Supplies
■
Personal Computers and Peripherals
■
Distributed Power Converters
■
Industrial Control Systems
■
Lead-Acid Battery Backup Systems
■
Automotive and Heavy Equipment
APPLICATIONS
U
TYPICAL APPLICATION
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
28V to 5V 20A Buck Converter
SYNC V
BOOST
5V
REF
TG
CT TS
SL/ADJ
12V
IN
I
AVG
BG
SS
PGND
V
C
PHASE
SGND
RUN/SHDN
V
FB
SENSE
+
V
REF
SENSE
–
DBST
IN5819
12V
V
IN
28V
C
IN
1500µF
63V
× 3
IRL3803
IRL3103D2
× 2
L1
10µH
V
OUT
5V AT 20A
R
FB2
1k
R
FB1
3k
LT1339
+
CBST
1µF
+
C
12VIN
47µF
+
C
OUT
2200µF
6.3V
× 2
+
D2
MBR0520
D1
MBR0520
R
RUN
100k
R
S
0.005Ω
R
CT
10k
C
CT
2200pF
C
AVG
2200pF
C
SS
,
1µF
C
VC
,
1nF
R
VC
, 10k
C
REF
0.1µF
1339 TA03
L1 = CTX02-13400-X2
C
5VREF
1µF
+
+
28V to 5V Efficiency
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
20
1339 TA03a
5
10
15
100
90
80
70
60
50
2
LT1339
sn1339 1339fas
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
12V
IN
= V
BOOST
= 12V, V
C
= 2V, TS = 0V, V
FB
= V
REF
= 1.25V, C
TG
= C
BG
= 3000pF, T
A
= 25°C unless otherwise noted.
E
LECTR
IC
AL C CHARA TERIST
ICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply and Protection
I
12VIN
DC Active Supply Current (Note 2) ● 14 20 mA
DC Standby Supply Current V
RUN/SHDN
< 0.5V ● 150 250 µA
I
BOOST
DC Active Supply Current (Note 2) 2.2 mA
DC Standby Supply Current V
RUN/SHDN
< 0.5V 0 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 ● 4814µA
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 5.00 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
Supply Voltages
Power Supply Voltage (12V
IN
)...............–0.3V to 20V
Topside Supply Voltage (V
BOOST
)
V
TS
– 0.3V to V
TS
+ 20V (V
MAX
= 75V)
Topside Reference Pin Voltage (TS) ......–0.3V to 60V
Input Voltages
Sense Amplifier Input Common Mode...–0.3V to 60V
RUN/SHDN Pin Voltage ...................... –0.3V to 12V
IN
All Other Inputs .......................................–0.3V to 7V
Maximum Currents
5V Reference Output Current............................ 65mA
Maximum Temperatures
Operating Ambient Temperature Range
LT1339C ............................................ 0°C to 70°C
LT1339I......................................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
(Note 1)
ORDER PART
NUMBER
LT1339CN
LT1339CSW
LT1339IN
LT1339ISW
TOP VIEW
N PACKAGE
20-LEAD PDIP
SW PACKAGE
20-LEAD PLASTIC SO WIDE
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
SYNC
5V
REF
CT
SL/ADJ
I
AVG
SS
V
C
SGND
V
FB
V
REF
V
BOOST
TG
TS
12V
IN
BG
PGND
PHASE
RUN/SHDN
SENSE
–
SENSE
+
WU
U
PACKAGE
/
O
RDER I FOR ATIO
T
JMAX
= 125°C, θ
JA
= 70°C/W (N)
T
JMAX
= 125°C, θ
JA
= 85°C/W (SW)
Consult factory for Military grade parts.
3
LT1339
sn1339 1339fas
12V
IN
= V
BOOST
= 12V, V
C
= 2V, TS = 0V, V
FB
= V
REF
= 1.25V, C
TG
= C
BG
= 3000pF, T
A
= 25°C unless otherwise noted.
E
LECTR
IC
AL C CHARA TERIST
ICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Error Amplifier
V
FB
Error Amplifier Reference Voltage Measured at Feedback Pin 1.242 1.250 1.258 V
● 1.235 1.250 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
V
SENSE
Peak Current Limit Threshold Measured at Sense Inputs ● 170 190 mV
Average Current Limit Threshold (Note 4) Measured at Sense Inputs
● 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
B
Input Bias Current Sink (V
CMSENSE
> 5V) ● 45 75 µA
Source (V
CMSENSE
= 0V) ● 700 1200 µA
Oscillator
f
O
Operating Frequency, Free Run ● 150 kHz
Frequency Programming Error (Note 3) f
O
≤ 150kHz ● –5 5 %
I
CT
Timing Capacitor Discharge Current LT1339C ● 2.20 2.50 2.75 mA
LT1339I
● 2.10 2.50 2.75 mA
V
SYNC
SYNC Input Threshold Rising Edge ● 0.8 2.0 V
f
SYNC
SYNC Frequency Range f
SYNC
≤ 150kHz ● f
O
1.4f
O
Output Drivers
V
TG,BG
Undervoltage Output Clamp 12V
IN
≤ 8V ● 0.4 0.7 V
Standby Mode Output Clamp V
RUN
< 0.5V ● 0.1 V
V
TG
Top Gate On Voltage ● 11.0 11.9 12.0 V
Top Gate Off Voltage
● 0.4 0.7 V
t
TGR
Top Gate Rise Time ● 130 200 ns
t
TGF
Top Gate Fall Time ● 60 140 ns
V
BG
Bottom Gate On Voltage ● 11.0 11.9 12.0 V
Bottom Gate Off Voltage
● 0.4 0.7 V
t
BGR
Bottom Gate Rise Time ● 70 200 ns
t
BGF
Bottom Gate Fall Time ● 60 140 ns
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 Application Information section.
Note 3: Test condition: R
CT
= 16.9k, C
CT
= 1000pF.
Note 4: Test Condition: V
CMSENSE
= 10V.
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute maximum ratings are those values beyond which the life
of a device may be impaired.
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LT1339ISW#PBF

Mfr. #:
Buy LT1339ISW#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators High Pwr Synch DC/DC Controller
Lifecycle:
New from this manufacturer.
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