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Linear Technology Electronic Components Datasheet

LTC3785EUF Datasheet

No RSENSE Buck-Boost Controller

No Preview Available !

Features
n Single Inductor Architecture Allows VIN Above,
Below or Equal to VOUT
n 2.7V to 10V Input and Output Range
n Up to 96% Efficiency
n Up to 10A of Output Current
n All N-channel MOSFETs, No RSENSE
n True Output Disconnect During Shutdown
n Programmable Current Limit and Soft-Start
n Optional Short-Circuit Shutdown Timer
n Output Overvoltage and Undervoltage Protection
n Programmable Frequency: 100kHz to 1MHz
n Selectable Burst Mode® Operation
n Available in 24-Lead (4mm × 4mm) Exposed Pad
QFN Package
Applications
n Palmtop Computers
n Handheld Instruments
n Wireless Modems
n Cellular Telephones
LTC3785
10V, High Efficiency,
Synchronous, No RSENSE
Buck-Boost Controller
Description
The LTC®3785 is a high power synchronous buck-boost
controller that drives all N-channel power MOSFETs from
input voltages above, below and equal to the output volt-
age. With an input range of 2.7V to 10V, the LTC3785 is
well suited for a wide variety of single or dual cell Li-Ion
or multicell alkaline/NiMH applications.
The operating frequency can be programmed from
100kHz to 1MHz. The soft-start time and current limit are
also programmable. The soft-start capacitor doubles as
the fault timer which can program the IC to latch off or
recycle after a determined off time. Burst Mode opera-
tion is user controlled and can be enabled by driving the
MODE pin high.
Protection features include foldback current limit, short-
circuit and overvoltage protection.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Typical Application
VOUT
VIN
VCC
205k
ISVIN
1.3k
270pF
VSENSE
205k 121k
TG1
VBST1
FB
SW1
121k 12k
ISSW1
VDRV
1nF
BG1
LTC3785
VC
59k
RT
ISVOUT
MODE
TG2
4.7µF
0.22µF
VIN
2.7V
TO 10V
22µF
4.7µH
VOUT
3.3V
5A
VBST2
RUN/SS
SW2
42.2k ILSET
ISSW2
1nF
CCM
BG2
GND
0.22µF
100µF
3785 TA01a
Efficiency vs Input Voltage
100
VOUT = 3.3V
FOSC = 500kHz
95
ILOAD = 2A
ILOAD = 1A
90
85
2.5
4
5.5
7
8.5
10
VIN (V)
3785 TA01b
3785fc



Linear Technology Electronic Components Datasheet

LTC3785EUF Datasheet

No RSENSE Buck-Boost Controller

No Preview Available !

LTC3785
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage (VIN).......................... –0.3V to 11V
ISVOUT, ISVIN ............................................... –0.3V to 11V
SW1, SW2, ISSW1, ISSW2 Voltage:
DC............................................................. –1V to 11V
Pulsed, <1µs.............................................. –2V to 12V
RUN/SS, MODE, CCM, VDRV, VCC Voltages... –0.3V to 6V
VBST1 Voltage............................................. –0.3V to 16V
With Respect to SW1............................... –0.3V to 6V
VBST2 Voltage............................................. –0.3V to 16V
With Respect to SW2............................... –0.3V to 6V
Peak Driver Output Current < 10µs
(TG1, TG2, BG1, BG2).................................................3A
VCC Average Output Current.................................100mA
Operating Junction Temperature Range
(Note 2)..................................................–40°C to 125°C
Junction Temperature............................................ 125°C
Storage Temperature Range...................–65°C to 150°C
Pin Configuration
TOP VIEW
24 23 22 21 20 19
RUN/SS 1
VC 2
FB 3
VSENSE 4
ILSET 5
CCM 6
18 ISSW1
17 BG1
25
16 VDRV
GND
15 BG2
14 ISSW2
13 SW2
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 40°C/W 1 LAYER BOARD, θJA = 30°C/W 4 LAYER BOARD
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3785EUF#PBF
LTC3785EUF#TRPBF
3785
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 85°C
LTC3785IUF#PBF
LTC3785IUF#TRPBF
3785
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3785EUF
LTC3785EUF#TR
3785
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 85°C
LTC3785IUF
LTC3785IUF#TR
3785
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to: http://www.linear.com/packaging/
Electrical Characteristics The l denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at TA = 25°C. VIN = ISVOUT = VDRV = VBST1 = VBST2 = 3.6V, RT = 49.9k, RILSET = 59k.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Supply
Input Operating Voltage
l 2.7
10
V
Quiescent Current—Burst Mode Operation
Quiescent Current—Shutdown
Quiescent Current—Active
VC = 0V, MODE = 3.6V (Note 4)
RUN/SS = 0V, ISVOUT = 3.6V
MODE = 0V (Note 4)
86
200
µA
15
25
µA
0.8
1.5
mA
Error Amp
Feedback Voltage
(Note 5)
l 1.200 1.225 1.25
V
Feedback Input Current
1
500
nA
3785fc



Part Number LTC3785EUF
Description No RSENSE Buck-Boost Controller
Maker Linear
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