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Linear Technology Electronic Components Datasheet

LTC3834IUFD Datasheet

Synchronous Step-Down Controller

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FEATURES
n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V
n Low Operating Quiescent Current: 30µA
n OPTI-LOOP® Compensation Minimizes COUT
n ±1% Output Voltage Accuracy
n Wide VIN Range: 4V to 36V
n Phase-Lockable Fixed Frequency 140kHz to 650kHz
n Dual N-Channel MOSFET Synchronous Drive
n Very Low Dropout Operation: 99% Duty Cycle
n Adjustable Output Voltage Soft-Start or Tracking
n Output Current Foldback Limiting
n Power Good Output Voltage Monitor
n Clock Output for PolyPhase® Applications
n Output Overvoltage Protection
n Low Shutdown IQ: 4µA
n Internal LDO Powers Gate Drive from VIN or VOUT
n Selectable Continuous, Pulse Skipping or
Burst Mode® Operation at Light Loads
n Small 20-Lead TSSOP or 4mm × 5mm QFN Package
APPLICATIONS
n Automotive Systems
n Telecom Systems
n Battery-Operated Digital Devices
n Distributed DC Power Systems
LTC3834
30µA IQ Synchronous
Step-Down Controller
DESCRIPTION
The LTC®3834 is a high performance step-down switching
regulator controller that drives an all N-channel synchro-
nous power MOSFET stage. A constant-frequency current
mode architecture allows a phase-lockable frequency of
up to 650kHz.
The 30µA no-load quiescent current extends operating
life 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
LTC3834 features a precision 0.8V reference and a power
good output indicator. The 4V to 36V input supply range
encompasses a wide range of battery chemistries.
The TRACK/SS pin ramps the output voltage during
start‑up. Current foldback limits MOSFET heat dissipation
during short-circuit conditions. A reduced feature set
version of the part (LTC3834-1) is available in a smaller,
lower pin count package.
Comparison of LTC3834 and LTC3834-1
PART #
LTC3834
CLKOUT/
PHASMD
Yes
EXTVCC
Yes
PGOOD
Yes
PACKAGES
FE20/4mm × 5mm QFN
LTC3834-1 No
No
No GN16/3mm × 5mm DFN
L, LT, LTC, LTM, Burst Mode, PolyPhase and OPTI-LOOP are registered trademarks and
No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 5408150, 5481178,
5705919, 5929620, 6304066, 6498466, 6580258, 6611131.
TYPICAL APPLICATION
High Efficiency Synchronous Step-Down Converter
0.01µF
560pF
54.2k
68.1k
215k
150pF
CLKOUT
VIN
PLLLPF
RUN
TG
PGOOD
TRACK/SS
BOOST
ITH
LTC3834
SW
SGND
PLLIN/MODE
VFB
SENSE
SENSE+
INTVCC
EXTVCC
BG
PGND
0.22µF
4.7µF
VIN
4V TO 36V
10µF
3.3µH 0.012Ω
VOUT
3.3V
5A
150µF
3834 TA01
100
90
80
70
60
50
40
30
20
10
0
0.000001
0.0001
0.01
OUTPUT CURRENT (A)
10000
1000
100
10
1
0.1
1
3834 TA01b
For more information www.linear.com/LTC3834
3834fc
1


Linear Technology Electronic Components Datasheet

LTC3834IUFD Datasheet

Synchronous Step-Down Controller

No Preview Available !

LTC3834
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN).......................... 36V to –0.3V
Topside Driver Voltage (BOOST)................. 42V to –0.3V
Switch Voltage (SW)...................................... 36V to –5V
INTVCC, (BOOST-SW), CLKOUT, PGOOD .. 8.5V to –0.3V
RUN, TRACK/SS ......................................... 7V to –0.3V
SENSE+, SENSEVoltages ..........................11V to –0.3V
PLLIN/MODE, PHASMD, PLLLPF .......... INTVCC to –0.3V
EXTVCC ...................................................... 10V to –0.3V
ITH, VFB Voltages ....................................... 2.7V to –0.3V
Peak Output Current <10µs (TG, BG)...........................3A
INTVCC Peak Output Current.................................. 50mA
Operating Temperature Range (Note 2)....–40°C to 85°C
Junction Temperature (Note 3).............................. 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
FE Package........................................................ 300°C
PIN CONFIGURATION
TOP VIEW
CLKOUT 1
20 PHASMD
PLLLPF 2
19 PLLIN/MODE
ITH 3
TRACKS/SS 4
VFB 5
SGND 6
18 PGOOD
17 SENSE+
21
16 SENSE
15 RUN
PGND 7
14 BOOST
BG 8
13 TG
INTVCC 9
EXTVCC 10
12 SW
11 VIN
FE PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 35°C/W
EXPOSED PAD (PIN 21) IS SGND, MUST BE SOLDERED TO PCB
TOP VIEW
ITH 1
TRACK/SS 2
VFB 3
SGND 4
PGND 5
BG 6
20 19 18 17
16 PGOOD
15 SENSE+
14 SENSE
21
13 RUN
12 BOOST
11 TG
7 8 9 10
UFD PACKAGE
20-PIN (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 21) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3834EFE#PBF
LTC3834EFE#TRPBF
LTC3834FE
20-Lead Plastic TSSOP
–40°C to 85°C (Note 2)
LTC3834IFE#PBF
LTC3834IFE#TRPBF
LTC3834FE
20-Lead Plastic TSSOP
–40°C to 85°C
LTC3834EUFD#PBF
LTC3834EUFD#TRPBF 3834
20-Lead (4mm × 5mm) Plastic QFN –40°C to 85°C (Note 2)
LTC3834IUFD#PBF
LTC3834IUFD#TRPBF 3834
20-Lead (4mm × 5mm) Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3834fc
2
For more information www.linear.com/LTC3834


Part Number LTC3834IUFD
Description Synchronous Step-Down Controller
Maker Linear Technology
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