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LTC3835EDHC-1-TRPBF Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3835EDHC-1-TRPBF
Description  Low IQ Synchronous Step-Down Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3835EDHC-1-TRPBF Datasheet(HTML) 1 Page - Linear Technology

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LTC3835
1
3835fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Low IQ Synchronous
Step-Down Controller
The LTC®3835 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 80μA 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
LTC3835 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.
High Efficiency Synchronous Step-Down Converter
n Wide Output Voltage Range: 0.8V ≤ VIN ≤ 10V
n Low Operating Quiescent Current: 80μA
n OPTI-LOOP® Compensation Minimizes COUT
n ±1% Output Voltage Accuracy
n Wide VIN Range: 4V to 36V Operation
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: 10μA
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
n Automotive Systems
n Telecom Systems
n Battery-Operated Digital Devices
n Distributed DC Power Systems
L, LT, LTC, LTM, Burst Mode, PolyPhase and OPTI-LOOP are registered trademarks 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.
Comparison of LTC3835 and LTC3835-1
PART #
CLKOUT/
PHASMD
EXTVCC
PGOOD
PACKAGES
LTC3835
YES
YES
YES
FE20/4
× 5 QFN
LTC3835-1
NO
NO
NO
GN16/3
× 5 DFN
VOUT
3.3V
5A
150μF
0.01μF
VIN
4V TO
36V
ITH
SGND
PLLIN/MODE
VFB
SENSE+
SENSE
CLKOUT
PLLLPF
RUN
PGOOD
TRACK/SS
INTVCC
EXTVCC
BG
PGND
LTC3835
3.3μH
0.012Ω
20k
3835 TA01
100pF
330pF
33k
62.5k
4.7μF
0.22μF
TG
VIN
BOOST
SW
10μF
LOAD CURRENT (mA)
0.01
0.1
1
10
100
1000 10000
3835 TA01b
0.001
1
10
1000
100
0.1
100000
10000
40
50
60
70
80
30
20
10
0
90
100
POWER LOSS
EFFICIENCY
VIN = 12V; VOUT = 3.3V
Efficiency and Power Loss
vs Load Current


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