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Linear Technology Electronic Components Datasheet

LTC1773 Datasheet

No RSENSE Low EMI / Synchronous DC/DC Controller with Output Tracking

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LTC1773 pdf
LTC1773
Synchronous Step-Down
DC/DC Controller
FEATURES
DESCRIPTIO
High Efficiency: Up to 95%
The LTC®1773 is a current mode synchronous buck regu-
Constant Frequency 550kHz Operation
lator controller that drives external complementary power
VIN from 2.65V to 8.5V
MOSFETs using a fixed frequency architecture. The oper-
VOUT from 0.8V to VIN
ating supply range is from 2.65V to 8.5V, making it
OPTI-LOOP® Compensation Minimizes COUT
Synchronizable up to 750kHz
mSelectable Burst Mode Operation
oLow Quiescent Current: 80µA
Low Dropout Operation: 100% Duty Cycle
.cSecondary Winding Regulation
Soft-Start
UCurrent Mode Operation for Excellent Line and
Load Transient Response
t4Low Shutdown IQ = 10µA
±1.5% Reference Accuracy
ePrecision 2.5V Undervoltage Lockout
eAvailable in 10-Lead MSOP
APPLICATIOUS ShCellular Telephones
taRF PA Supplies
Portable Instruments
aWireless MODEMS
Distributed Power Systems
.DNotebook and Palm Top Computers, PDAs
Single and Dual Cell Lithium-Ion Powered Devices
suitable for 1- or 2-cell lithium-ion battery powered appli-
cations. Burst Mode® operation provides high efficiency at
low load currents. 100% duty cycle provides low dropout
operation which extends operating time in battery-oper-
ated systems.
The operating frequency is internally set at 550kHz, allow-
ing the use of small surface mount inductors. For switch-
ing-noise sensitive applications, it can be synchronized up
to 750kHz. Peak current limit is user programmable with
an external high side sense resistor. A SYNC/FCB control
pin guarantees regulation of secondary windings regard-
less of load on the main output by forcing continuous
operation. Burst Mode operation is inhibited during syn-
chronization or when the SYNC/FCB pin is pulled low to
reduce noise and RF interference. Soft-start is provided by
an external capacitor.
Synchronous rectification increases efficiency and elimi-
nates the need for a Schottky diode, saving components
and board space. The LTC1773 comes in a 10-lead MSOP
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology Corporation.
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815.
TYPICAL APPLICwATIwO VIN
w 2.65V TO 8.5V
High Efficiency
SYNC/FCB VIN
RUN/SS SENSE
0.1µF
ITH TG
47pF
30k
LTC1773
SW
RSENSE
0.025
L1
3µH
+
CIN
68µF
VOUT
2.5V
100
95 VIN = 3.3V
90 VIN = 5V
85 VIN = 8V
80
75
220pF
VFB GND BG
80.6k
Si9801DY
169k
+ COUT
180µF
1773 F01
70
65
60
L = SUMIDA CDRH6D28-3R0
55
1 10 100 1000 5000
OUTPUT CURRENT (mA)
Figure 1. Step-Down Converter
1773 F1b
1773fa
1


Linear Technology Electronic Components Datasheet

LTC1773 Datasheet

No RSENSE Low EMI / Synchronous DC/DC Controller with Output Tracking

No Preview Available !

LTC1773 pdf
LTC1773
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage .............................. –0.3V to 10.0V
ITH Voltage ................................................ –0.3V to 2.5V
RUN/SS, VFB, SENSEVoltages .................. –0.3V to VIN
SYNC/FCB Voltage ...................................... –0.3V to VIN
BG, TG Voltages...........................................–0.3V to VIN
SW Voltage ...................................................– 5V to 11V
Operating Ambient 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.)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
ITH 1
RUN/SS 2
SYNC/FCB 3
VFB 4
GND 5
TOP VIEW
10 SW
9 SENSE
8 VIN
7 TG
6 BG
MS10 PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 120°C/W
LTC1773EMS
MS10 PART MARKING
LTMV
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range, TA = 25°C. VIN = 5V unless otherwise specified.
SYMBOL
IVFB
VFB
VOVL
VFB
VLOADREG
IS
VRUN/SS
IRUN/SS
VSYNC/FCB
ISYNC/FCB
fOSC
VUVLO
VSENSE(MAX)
TG tr
TG tf
BG tr
BG tf
PARAMETER
Feedback Current
Regulated Feedback Voltage
Output Overvoltage Lockout
Reference Voltage Line Regulation
Output Voltage Load Regulation
Input DC Bias Current
Normal Mode
Burst Mode Operation
Shutdown
Shutdown
RUN/SS Threshold
Soft-Start Current Source
Auxiliary Feedback Threshold
SYNC/FCB Pull-Up Current
Oscillator Frequency
Undervoltage Lockout
Top Gate Drive Rise Time
Top Gate Drive Fall Time
Bottom Gate Drive Rise Time
Bottom Gate Drive Fall Time
CONDITIONS
MIN TYP MAX
(Note 4)
20 60
(Note 4)
0.788 0.80 0.812
VOVL = VOVL – VFB
VIN = 2.7V to 8.5V (Note 4)
ITH at 1.0V (Note 4)
ITH at 0.6V (Note 4)
(Note 5)
VIN = 5V, VITH = OPEN, VSYNC/MODE = OPEN
VITH = 0V, VIN = 5V, VSYNC/MODE = OPEN
VRUN/SS = 0V, 2.7V < VIN < 8.5V
VRUN/SS = 0V, VIN < 2.4V
40 60 80
0.002 0.02
0.2 0.8
–0.2 –0.8
400 600
80
10 30
25
0.4 0.7 1.0
VRUN/SS = 0V
VSYNC/FCB Ramping Negative
VSYNC/FCB = 0V
VFB = 0.8V
VFB = 0V
VIN Ramping Down from 3V
VIN Ramping Up from 0V
Maximum Current Sense Voltage
0.75 1.5
2.5
0.76 0.8 0.84
0.1 0.4 1.0
500 550 600
55
2.35 2.5 2.65
2.65 2.8
85
100 115
CLOAD = 3000pF (Note 6)
CLOAD = 3000pF (Note 6)
CLOAD = 3000pF (Note 6)
CLOAD = 3000pF (Note 6)
45 160
48 150
80 180
45 150
UNITS
nA
V
mV
%/V
%
%
µA
µA
µA
µA
V
µA
V
µA
kHz
kHz
V
V
mV
ns
ns
ns
ns
1773fa
2


Part Number LTC1773
Description No RSENSE Low EMI / Synchronous DC/DC Controller with Output Tracking
Maker Linear Technology
Total Page 20 Pages
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