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Linear Technology Electronic Components Datasheet

LTC3807HFE Datasheet

Synchronous Step-Down Controller

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LTC3807
Low IQ, Synchronous
Step-Down Controller with 24V
Output Voltage Capability
FEATURES
n Wide VIN Range: 4V to 38V (40V Abs Max)
n Low Operating IQ: 50μA
n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
n RSENSE or DCR Current Sensing
n Phase-Lockable Frequency (75kHz to 750kHz)
n Programmable Fixed Frequency (50kHz to 900kHz)
n Selectable Continuous, Pulse-Skipping or Low Ripple
Burst Mode® Operation at Light Load
n Selectable Current Limit
n Very Low Dropout Operation: 99% Duty Cycle
n Adjustable Output Voltage Soft-Start or Tracking
n Power Good Output Voltage Monitor
n Output Overvoltage Protection
n Low Shutdown IQ: 14μA
n Internal LDO Powers Gate Drive from VIN or EXTVCC
n No Current Foldback During Start-Up
n Small 20-Pin 3mm × 4mm QFN and TSSOP Packages
APPLICATIONS
n Automotive Always-On Systems
n Battery Powered Digital Devices
n Distributed DC Power Systems
DESCRIPTION
The LTC®3807 is a high performance step-down switching
regulator DC/DC controller that drives an all N-channel
synchronous power MOSFET stage. A constant fre-
quency current mode architecture allows a phase-lockable
frequency of up to 750kHz.
The 50μA no-load quiescent current extends operating run
time in battery-powered systems. OPTI-LOOP® compensa-
tion allows the transient response to be optimized over
a wide range of output capacitance and ESR values. The
LTC3807 features a precision 0.8V reference and power
good output indicator. A wide 4V to 38V input supply range
encompasses a wide range of intermediate bus voltages
and battery chemistries. The output voltage of the LTC3807
can be programmed between 0.8V to 24V.
The TRACK/SS pin ramps the output voltages during
start-up. Current foldback limits MOSFET heat dissipation
during short-circuit conditions. The PLLIN/MODE pin se-
lects among Burst Mode operation, pulse-skipping mode,
or continuous conduction mode at light loads.
L, LT, LTC, LTM, OPTI-LOOP, Burst Mode, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Patents, including 5481178, 5705919, 6611131, 6498466, 6580258,
7230497.
TYPICAL APPLICATION
High Efficiency 12V/10A Step-Down Converter
VIN
12.5V TO 38V
22µF
VIN
INTVCC
LTC3807
2.2µF
60.4k
4.7nF
15.4k
47pF
FREQ
ITH
0.1µF
VOUT
TRACK/SS
EXTVCC
SGND
TG
BOOST
SW
BG
PGND
SENSE+
SENSE
VFB
PGOOD
0.1µF
10µH
100k
INTVCC
4mΩ
150µF
VOUT
12V
10A
100k
6.98k
3807 TA01a
For more information www.linear.com/LTC3807
Efficiency and Power Loss vs
Output Current
100
10
VIN = 24V
90 VOUT = 12V
80
EFFICIENCY
1
70
60
50
POWER LOSS 0.1
40
30
0.01
20
10
0
0.0001 0.001
0.01 0.1
IOUT (A)
FIGURE 13 CIRCUIT
Burst Mode OPERATION
0.001
1
10
3807 TA01b
3807fa
1


Linear Technology Electronic Components Datasheet

LTC3807HFE Datasheet

Synchronous Step-Down Controller

No Preview Available !

LTC3807
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN).......................... –0.3V to 40V
Topside Driver Voltage (BOOST)................. –0.3V to 46V
Switch Voltage (SW)...................................... –5V to 40V
(BOOST-SW)................................................. –0.3V to 6V
RUN.............................................................. –0.3V to 8V
Maximum Current Sourced into Pin from
Source > 8V.......................................................100μA
SENSE+, SENSEVoltages.......................... –0.3V to 28V
PLLIN/MODE, INTVCC Voltages.................... –0.3V to 6V
ILIM, FREQ Voltages............................... –0.3V to INTVCC
EXTVCC....................................................... –0.3V to 14V
ITH, VFB Voltages.......................................... –0.3V to 6V
PGOOD Voltage............................................. –0.3V to 6V
TRACK/SS Voltage........................................ –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC3807E, LTC3807I.......................... –40°C to 125°C
LTC3807H........................................... –40°C to 150°C
LTC3807MP........................................ –55°C to 150°C
Maximum Junction Temperature (Notes 2, 3)
LTC3807E, LTC3807I......................................... 125°C
LTC3807H, LTC3807MP.................................... 150°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
PLLIN/MODE 1
SGND 2
SGND 3
RUN 4
SENSE5
SENSE+ 6
20 19 18 17
21
SGND
16 PGND
15 EXTVCC
14 INTVCC
13 BG
12 BOOST
11 SW
7 8 9 10
UDC PACKAGE
20-LEAD (3mm × 4mm) PLASTIC QFN
TJMAX = 150°C, θJA = 43°C/W
EXPOSED PAD (PIN 21) IS SGND, MUST BE SOLDERED TO PCB
TOP VIEW
TRACK/SS 1
FREQ 2
PLLIN/MODE 3
SGND 4
SGND 5
RUN 6
SENSE7
SENSE+ 8
VFB 9
ITH 10
21
SGND
20 ILIM
19 VIN
18 PGND
17 EXTVCC
16 INTVCC
15 BG
14 BOOST
13 SW
12 TG
11 PGOOD
FE PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 38°C/W
EXPOSED PAD (PIN 21) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3807EUDC#PBF
LTC3807IUDC#PBF
LTC3807HUDC#PBF
LTC3807MPUDC#PBF
LTC3807EFE#PBF
LTC3807IFE#PBF
TAPE AND REEL
LTC3807EUDC#TRPBF
LTC3807IUDC#TRPBF
LTC3807HUDC#TRPBF
LTC3807MPUDC#TRPBF
LTC3807EFE#TRPBF
LTC3807IFE#TRPBF
PART MARKING*
LGSG
LGSG
LGSG
LGSG
LTC3807FE
LTC3807FE
PACKAGE DESCRIPTION
20-Lead (3mm × 4mm) Plastic QFN
20-Lead (3mm × 4mm) Plastic QFN
20-Lead (3mm × 4mm) Plastic QFN
20-Lead (3mm × 4mm) Plastic QFN
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
2
For more information www.linear.com/LTC3807
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
–40°C to 125°C
–40°C to 125°C
3807fa


Part Number LTC3807HFE
Description Synchronous Step-Down Controller
Maker Linear
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