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LTC3850

Description
Dual, 2-Phase Synchronous Step-Down Switching Controller
File Size524KB,36 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3850 Overview

Dual, 2-Phase Synchronous Step-Down Switching Controller

FEATURES
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LTC3850/LTC3850-1
Dual, 2-Phase
Synchronous Step-Down
Switching Controller
DESCRIPTION
The LTC
®
3850 is a high performance dual synchronous
step-down switching regulator controller that drives all
N-channel power MOSFET stages. A constant-frequency
current mode architecture allows a phase-lockable fre-
quency of up to 780kHz. Power loss and supply noise are
minimized by operating the two controller output stages
out of phase.
OPTI-LOOP
®
compensation allows the transient response
to be optimized over a wide range of output capacitance
and ESR values. The LTC3850 features a precision 0.8V
reference and a power good output indicator. A wide 4V to
24V (28V maximum/30V for LTC3850I) input supply range
encompasses most battery chemistries and intermediate
bus voltages.
Independent TK/SS pins for each controller ramp the
output voltages during start-up. Current foldback limits
MOSFET heat dissipation during short-circuit condi-
tions. The MODE/PLLIN pin selects among Burst Mode
®
operation, pulse-skipping mode, or continuous inductor
current mode and allows the IC to be synchronized to an
external clock.
The LTC3850 is available in low profile 28-pin 4mm
×
4mm,
4mm
×
5mm QFN and narrow SSOP packages.
Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
High Efficiency: Up to 95%
R
SENSE
or DCR Current Sensing
±1% 0.8V Output Voltage Accuracy
Phase-Lockable Fixed Frequency 250kHz to 780kHz
Supports Pre-Biased Output
Dual N-Channel MOSFET Synchronous Drive
Wide V
IN
Range: 4V to 24V (30V for LTC3850I)
Operation
Adjustable Soft-Start Current Ramping or Tracking
Foldback Output Current Limiting
Output Overvoltage Protection
Power Good Output Voltage Monitor
28-Pin 4mm
×
4mm, 4mm
×
5mm QFN and Narrow
SSOP Packages
APPLICATIONS
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Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems
L,
LT, LTC, LTM, OPTI-LOOP and BURST MODE are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by U.S.
Patents, including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258.
TYPICAL APPLICATION
High Efficiency Dual 3.3V/2.5V Step-Down Converter
4.7μF
V
IN
PGOOD INTV
CC
0.1μF
2.2μH
TG1
BOOST1
SW1
BG1
2.2k
500kHz
LTC3850
TG2
BOOST2
SW2
BG2
PGND
FREQ/PLLFLTR
SENSE2
+
RUN2
SENSE2
V
FB2
I
TH2
SGND
TK/SS2
0.1μF
10nF
10k
220pF
15k
20k
38501 TA01
Efficiency
22μF
50V
V
IN
7V TO
24V
100
V
IN
= 12V
95 V
OUT
= 3.3V
90
85
80
75
70
65
60
100
POWER LOSS
10000
EFFICIENCY
0.1μF
2.2μH
2.2k
EFFICIENCY (%)
POWER LOSS (mW)
1000
MODE/PLLIN
I
LIM
SENSE1
+
RUN1
SENSE1
V
FB1
I
TH1
TK/SS1
0.1μF
V
OUT1
3.3V
5A
100μF
6V
0.1μF
V
OUT2
2.5V
5A
100μF
6V
55
50
10
100
1000
LOAD CURRENT (mA)
10
10000
38501 TA01b
63.4k
220pF
20k
15k
43.2k
0.1μF
38501fb
1

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