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Linear Technology Electronic Components Datasheet

LTC3531ES6-3.3 Datasheet

Buck-Boost Synchronous DC/DC Converters

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LTC3531/
LTC3531-3.3/LTC3531-3
200mA Buck-Boost
Synchronous DC/DC
Converters
FEATURES
Regulated Output with Input Above, Below or Equal
to the Output
Single Inductor
Up to 90% Efficiency
VIN Range: 1.8V to 5.5V
200mA at 3.3VOUT from 3.6V Input
125mA at 3VOUT from 2.5V Input
Fixed VOUT Versions (TSOT, DFN): 3.3V, 3V
Adjustable VOUT Version (DFN): 2V to 5V
Burst Mode® Operation, No External Compensation
Ultra Low Quiescent Current: 16μA, Shutdown
Current <1μA
Only 3 External Components Required
(Fixed Voltage Versions)
Short-Circuit Protection
Output Disconnect in Shutdown
Available in 6-Pin ThinSOT and 3mm × 3mm DFN
Packages
U
APPLICATIO S
Handheld Instruments
MP3 Players
Handheld computers
PDA/GPS
DESCRIPTIO
The LTC®3531/LTC3531-3.3/LTC3531-3 are synchronous
buck-boost DC/DC converters that operate from input
voltages above, below or equal to the output voltage. The
topology incorporated in the ICs provides a continuous
transfer through all operating modes, making the product
ideal for single cell Li-Ion and multicell alkaline or nickel
applications. The converters operate in Burst Mode, mini-
mizing solution footprint and component count as well as
providing high conversion efficiency over a wide range of
load currents.
The devices include two 0.5Ω N-channel MOSFET switches
and two P-channel switches (0.5Ω, 0.8Ω). Quiescent
current is typically 16μA, making the parts ideal for bat-
tery power applications. Other features include a <1μA
shutdown current, current limiting, thermal shutdown
and output disconnect. The parts are offered in a 6-pin
ThinSOTTM package for fixed voltage versions or a 3mm ×
3mm DFN package for fixed and adjustable versions.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6166527.
TYPICAL APPLICATIO
VIN
3.1V TO
4.2V
Li-Ion
10μH
SW1 SW2
VIN
VOUT
LTC3531-3.3
2.2μF
SHDN GND
ON OFF
VOUT
3.3V
160mA
10μF
3531 TA01a
Efficiency vs VIN
100
95
90
BOOST
MODE
85
BUCK
MODE
80
4SW
75
MODE
70
65
3.3VOUT AT 100mA
60
1.5 2 2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
3531 TA01b
3531fb
1


Linear Technology Electronic Components Datasheet

LTC3531ES6-3.3 Datasheet

Buck-Boost Synchronous DC/DC Converters

No Preview Available !

LTC3531/
LTC3531-3.3/LTC3531-3
ABSOLUTE AXI U RATI GS
(Note 1)
VIN, VOUT, SW1, SW2, SHDN Voltage ...........–0.3 to 6V
SW1, SW2 Voltage, <100ns Pulse ..................–0.3 to 7V
Operating Temperature Range (Notes 2, 3) –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature (TS6, Soldering, 10 sec) .......... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SW2 1
GND, PGND 2
VOUT 3
TOP VIEW
6 SW1
5 VIN
4 SHDN
SW1 1
8 PGND
VIN 2
9
7 SW2
GND 3
6 VOUT
SHDN 4
5 FB*
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 102°C/W
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD IS GND (PIN 9), MUST BE SOLDERED TO PCB
*NC FOR LTC3531-3.3V, LTC3531-3.0V.
ORDER PART NUMBER
S6 PART MARKING
ORDER PART NUMBER
DD PART MARKING
LTC3531ES6-3.3
LTC3531ES6-3
LTBWM
LTCBK
LTC3531EDD
LTC3531EDD-3.3
LTC3531EDD-3
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LBVC
LBWH
LCBV
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V VOUT = 3.3V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
VIN
Minimum Startup Voltage
1.65 1.8
VOUT Regulation
Output Voltage (3.3V Version)
No Load
3.25 3.32 3.39
Output Voltage (3V Version)
No Load
2.95 3.02 3.09
FB Voltage (Adj Version)
No Load
1.20 1.225 1.25
FB Input Current (Adj Version)
Operating Current
VFB = 1.225V
1
50
Quiescent Current in Sleep:
Shutdown Current
Switch Performance
VIN VIN = 5V, VOUT = 3.6V, FB = 1.3V
VOUT VOUT = 3.6V
VIN SHDN = 0V, VOUT = 0V
16
30
6
10
1
NMOS Switch Leakage
Switches B and C
0.2
2
PMOS Switch Leakage
Switches A and D
0.2
2
NMOS B, C RDSON
VIN = 5V
0.5
PMOS A RDSON
VIN = 5V
0.5
UNITS
V
V
V
V
nA
μA
μA
μA
μA
μA
Ω
Ω
3531fb
2


Part Number LTC3531ES6-3.3
Description Buck-Boost Synchronous DC/DC Converters
Maker Linear
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