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LTC3850IGN-2#PBF

Description
IC REG CTRLR BUCK 28SSOP
Categorysemiconductor    Power management   
File Size400KB,36 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LTC3850IGN-2#PBF Overview

IC REG CTRLR BUCK 28SSOP

LTC3850IGN-2#PBF Parametric

Parameter NameAttribute value
Output typetransistor driver
Functionstep down
Output configurationjust
Topologystep down
Number of outputs2
output stage2
Voltage - Power Supply (Vcc/Vdd)4 V ~ 30 V
Frequency - Switch250kHz ~ 780kHz
Duty cycle (maximum)0.972
Synchronous rectifieryes
Clock synchronizationnone
serial interface-
Control characteristicsCurrent limit, enable, frequency control, power good, soft start, tracking
Operating temperature-40°C ~ 85°C(TA)
Package/casing28-SSOP (0.154", 3.90mm wide)
Supplier device packaging28-SSOP
FEATURES
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LTC3850-2
Dual, 2-Phase
Synchronous Step-Down
Switching Controller
DESCRIPTION
The LTC
®
3850-2 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
frequency 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 LTC3850-2 features a precision 0.8V
reference and a power good output indicator. A wide 4V
to 30V 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 LTC3850-2 is identical to the LTC3850-1, except they
have different pin assignments.
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 30V Operation
Adjustable Soft-Start Current Ramping or Tracking
Foldback Output Current Limiting
Output Overvoltage Protection
Power Good Output Voltage Monitor
28-Pin Narrow SSOP Package
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
TG2
0.1μF
2.2μH
2.2k
EFFICIENCY (%)
22μF
50V
V
IN
7V TO
26V
100
V
IN
= 12V
95 V
OUT
= 3.3V
90
85
80
75
70
65
60
0.1μF
V
OUT2
2.5V
5A
100μF
6V
38502 TA01
Efficiency
10000
EFFICIENCY
POWER LOSS (mW)
BOOST1
BOOST2
SW1
SW2
LTC3850-2
BG2
BG1
500kHz
MODE/PLLIN
EXT
VCC
0.1μF
SENSE1
+
RUN1
SENSE1
V
FB1
I
TH1
220pF
TK/SS1
0.1μF
SGND
20k
15k
PGND
FREQ/PLLFLTR
SENSE2
+
RUN2
SENSE2
V
FB2
I
TH2
TK/SS2
0.1μF
10nF
10k
220pF
15k
20k
1000
2.2k
100
POWER LOSS
55
50
10
100
1000
LOAD CURRENT (mA)
10
10000
38502 TA01b
V
OUT1
3.3V
5A
100μF
6V
63.4k
43.2k
38502f
1

LTC3850IGN-2#PBF Related Products

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Description IC REG CTRLR BUCK 28SSOP IC REG CTRLR BUCK 28SSOP
Output type transistor driver transistor driver
Function step down step down
Output configuration just just
Topology step down step down
Number of outputs 2 2
output stage 2 2
Voltage - Power Supply (Vcc/Vdd) 4 V ~ 30 V 4 V ~ 30 V
Frequency - Switch 250kHz ~ 780kHz 250kHz ~ 780kHz
Duty cycle (maximum) 0.972 0.972
Synchronous rectifier yes yes
Clock synchronization none none
Control characteristics Current limit, enable, frequency control, power good, soft start, tracking Current limit, enable, frequency control, power good, soft start, tracking
Operating temperature -40°C ~ 85°C(TA) -40°C ~ 85°C(TA)
Package/casing 28-SSOP (0.154", 3.90mm wide) 28-SSOP (0.154", 3.90mm wide)
Supplier device packaging 28-SSOP 28-SSOP
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