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LT1976EFE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LT1976/LT1976B
1
1976bfg
■
High Voltage Power Conversion
■
14V and 42V Automotive Systems
■
Industrial Power Systems
■
Distributed Power Systems
■
Battery-Powered Systems
■
Wide Input Range: 3.3V to 60V
■
1.5A Peak Switch Current (LT1976)
■
100μA Quiescent Current (LT1976)**
■
1.6mA Quiescent Current (LT1976B)
■
Low Shutdown Current: I
Q
< 1μA
■
Power Good Flag with Programmable Threshold
■
Load Dump Protection to 60V
■
200kHz Switching Frequency
■
Saturating Switch Design: 0.2Ω On-Resistance
■
Peak Switch Current Maintained Over
Full Duty Cycle Range*
■
1.25V Feedback Reference Voltage
■
Easily Synchronizable
■
Soft-Start Capability
■
Small 16-Pin Thermally Enhanced TSSOP Package
High Voltage 1.5A, 200kHz
Step-Down Switching Regulator
with 100μA Quiescent Current
*Protected by U.S. Patents, including 6498466
**See Burst Mode Operation section for conditions
The LT
®
1976/LT1976B are 200kHz monolithic step-down
switching regulators that accept input voltages up to 60V.
A high efficiency 1.5A, 0.2Ω switch is included on the die
along with all the necessary oscillator, control and logic
circuitry. Current mode topology is used for fast transient
response and good loop stability.
Innovative design techniques along with a new high volt-
age process achieve high efficiency over a wide input
range. Efficiency is maintained over a wide output current
range by employing Burst Mode operation at low currents,
utilizing the output to bias the internal circuitry, and by
using a supply boost capacitor to fully saturate the power
switch. The LT1976B does not shift into Burst Mode
operation at low currents, eliminating low frequency out-
put ripple at the expense of efficiency. Patented circuitry
maintains peak switch current over the full duty cycle
range.* Shutdown reduces input supply current to less
than 1μA. External synchronization can be implemented
by driving the SYNC pin with logic-level inputs. A single
capacitor from the C
SS
pin to the output provides a
controlled output voltage ramp (soft-start). The devices
also have a power good flag with a programmable thresh-
old and time-out and thermal shutdown protection.
The LT1976/LT1976B are available in a 16-pin TSSOP
package with Exposed Pad leadframe for low thermal
resistance.
V
IN
SHDN
V
C
BOOST
V
BIAS
FB
PGFB
PG
LT1976
4.7μF
100V
CER
330pF
0.33μF
0.1μF
33μH
4148
1μF
SYNC
C
T
GND
100μF
6.3V
TANT
V
OUT
3.3V
1A
V
IN
3.3V TO 60V
10MQ60N
1500pF
10k
165k
1%
100k
1%
1976 TA01
47pF
SW
C
SS
14V to 3.3V Step-Down Converter with
100μA No Load Quiescent Current
LT1976 Efficiency and Power
Loss vs Load Current
LOAD CURRENT (mA)
0.1
EFFICIENCY (%)
POWER LOSS (W)
50
75
5V
3.3V
1000
1976 TA02
25
0
1
10
100
10000
100
0.1
1
0.01
0.001
10
EFFICIENCY
TYPICAL
POWER LOSS
LT1976 Supply Current vs
Input Voltage
INPUT VOLTAGE (V)
0
0
SUPPLY CURRENT (μA)
50
100
10
20
30 40
1976 F05
50
150
25
75
125
60
V
OUT
= 3.3V
T
A
= 25°C
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LT1976/LT1976B
2
1976bfg
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
(Note 1)
V
IN
, SHDN, PG, BIAS .............................................. 60V
BOOST Pin Above SW ............................................ 35V
BOOST Pin Voltage ................................................. 68V
SYNC, C
SS
, PGFB, FB................................................ 6V
Operating JunctionTemperature Range
LT1976EFE/LT1976BEFE (Note 2) ... – 40°C to 125°C
LT1976IFE/LT1976BIFE (Note 2) ..... –40°C to 125°C
LT1976HFE (Note 2) ........................ –40°C to 140°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LT1976EFE
LT1976IFE
LT1976HFE
LT1976BEFE
LT1976BIFE
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full –40°C to 125°C
operating temperature range, otherwise specifications are at T
J
= 25°C. V
IN
= 12V, SHDN = 12V, BOOST = 15.3V, BIAS = 5V,
FB/PGFB = 1.25V, C
SS
/SYNC = 0V unless otherwise noted.
θ
JA
= 45°C/W, θ
JC(PAD)
= 10°C/W
EXPOSED PAD IS GND (PIN 17)
MUST BE SOLDERED TO GND (PIN 8)
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
NC
SW
NC
V
IN
NC
BOOST
C
T
GND
PG
SHDN
SYNC
PGFB
FB
V
C
BIAS
C
SS
17
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
SHDN
SHDN Threshold ● 1.2 1.3 1.4 V
I
SHDN
SHDN Input Current SHDN = 12V ● 520 μA
Minimum Input Voltage (Note 3) ● 2.4 3 V
I
VINS
Supply Shutdown Current SHDN = 0V, BOOST = 0V, FB/PGFB = 0V 0.1 2 μA
Supply Sleep Current (Note 4) (LT1976) BIAS = 0V, FB = 1.35V ● 170 230 μA
FB = 1.35V
● 45 75 μA
I
VIN
Supply Quiescent Current BIAS = 0V, FB = 1.15V, V
C
= 0.8V (V
C
= 0V LT1976B) 3.2 4.10 mA
BIAS = 5V, FB = 1.15V, V
C
= 0.8V (V
C
= 0V LT1976B) 2.6 3.25 mA
Minimum BIAS Voltage (Note 5) ● 2.7 3 V
I
BIASS
BIAS Sleep Current (Note 4) (LT1976) ● 110 180 μA
I
BIAS
BIAS Quiescent Current SYNC = 3.3V 700 800 μA
Minimum Boost Voltage (Note 6) I
SW
= 1.5A 1.8 2.5 V
Input Boost Current (Note 7) I
SW
= 1.5A 40 50 mA
V
REF
Reference Voltage (V
REF
) 3.3V < V
VIN
< 60V ● 1.225 1.25 1.275 V
I
FB
FB Input Bias Current 75 200 nA
EA Voltage Gain (Note 8) 900 V/V
EA Voltage g
m
dI(V
C
)= ±10μA 400 650 800 μMho
EA Source Current FB = 1.15V 20 40 55 μA
EA Sink Current FB = 1.35V 15 30 40 μA
V
C
to SW g
m
3A/V
V
C
High Clamp 2.1 2.2 2.4 V
V
C
Switching Threshold (LT1976B) ● 0.1 0.4 0.8 V
FE PART MARKING
1976EFE
1976IFE
1976HFE
1976BEFE
1976BIFE
LT1976/LT1976B
3
1976bfg
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
PK
SW Current Limit LT1976 ● 1.5 2.4 3.5 A
LT1976B 1.2 2.5 4 A
Switch On Resistance (Note 9) ● 0.2 0.4 Ω
Switching Frequency BOOST = OPEN ● 180 200 230 kHz
Maximum Duty Cycle 90 92 %
Minimum SYNC Amplitude 1.5 2.0 V
SYNC Frequency Range 230 600 kHz
SYNC Input Impedance SYNC = 0.5V 100 kΩ
I
CSS
C
SS
Current Threshold (Note 10) FB = 0V 7 13 20 μA
I
PGFB
PGFB Input Current 25 100 nA
V
PGFB
PGFB Voltage Threshold (Note 11) ● 88 90 92 %
I
CT
C
T
Source Current (Note 11) ● 2 3.6 5.5 μA
C
T
Sink Current (Note 11) 1 2 mA
V
CT
C
T
Voltage Threshold (Note 11) 1.16 1.2 1.26 V
PG Leakage (Note 11) PG = 12V 0.1 1 μA
PG Sink Current (Note 11) PGFB = 1V, PG = 400mV 120 200 μA
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full –40°C to 125°C
operating temperature range, otherwise specifications are at T
J
= 25°C. V
IN
= 12V, SHDN = 12V, BOOST = 15.3V, BIAS = 5V,
FB/PGFB = 1.25V, C
SS
/SYNC = 0V unless otherwise noted.
The ● denotes the specifications which apply over the full –40°C to 140°C operating temperature range, otherwise specifications are
at T
J
= 25°C. V
IN
= 12V, SHDN = 12V, BOOST = 15.3V, BIAS = 5V, FB/PGFB = 1.25V, C
SS
/SYNC = 0V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
SHDN
SHDN Threshold ● 1.2 1.3 1.4 V
I
SHDN
SHDN Input Current SHDN = 12V ● 520 μA
Minimum Input Voltage (Note 3) ● 2.4 3 V
I
VINS
Supply Shutdown Current SHDN = 0V, BOOST = 0V, FB/PGFB = 0V 0.1 2 μA
Supply Sleep Current (Note 4) (LT1976) BIAS = 0V, FB = 1.35V ● 170 300 μA
FB = 1.35V
● 45 100 μA
I
VIN
Supply Quiescent Current BIAS = 0V, FB = 1.15V, V
C
= 0.8V 3.2 4.10 mA
BIAS = 5V, FB = 1.15V, V
C
= 0.8V 2.6 3.25 mA
Minimum BIAS Voltage (Note 5) ● 2.7 3 V
I
BIASS
BIAS Sleep Current (Note 4) ● 110 180 μA
I
BIAS
BIAS Quiescent Current SYNC = 3.3V 700 800 μA
Minimum Boost Voltage (Note 6) I
SW
= 1.5A 1.8 2.5 V
Input Boost Current (Note 7) I
SW
= 1.5A 40 50 mA
V
REF
Reference Voltage (V
REF
) 3.3V < V
VIN
< 60V ● 1.212 1.25 1.288 V
I
FB
FB Input Bias Current 75 200 nA
EA Voltage Gain (Note 8) 900 V/V
EA Voltage g
m
dI(V
C
)= ±10μA 400 650 800 μMho
EA Source Current FB = 1.15V 20 40 55 μA
EA Sink Current FB = 1.35V 15 30 40 μA
V
C
to SW g
m
3A/V
V
C
High Clamp 2.1 2.2 2.4 V
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LT1976EFE#PBF

Mfr. #:
Buy LT1976EFE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.5A, 200kHz uP HV Step-down Converter
Lifecycle:
New from this manufacturer.
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