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Linear Technology Electronic Components Datasheet

LTC3809EMSE Datasheet

Synchronous DC/DC Controller

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LTC3809
No RSENSE™, Low EMI,
Synchronous DC/DC Controller
FEATURES
DESCRIPTION
n No Current Sense Resistor Required
n Selectable Spread Spectrum Frequency Modulation
for Low Noise Operation
n Constant Frequency Current Mode Operation for
Excellent Line and Load Transient Response
n True PLL for Frequency Locking or Adjustment
(Frequency Range: 250kHz to 750kHz)
n Wide VIN Range: 2.75V to 9.8V
n Wide VOUT Range: 0.6V to VIN
n 0.6V ±1.5% Reference
n Low Dropout Operation: 100% Duty Cycle
n Selectable Burst Mode®/Pulse-Skipping/Forced
Continuous Operation
n Auxiliary Winding Regulation
n Internal Soft-Start Circuitry
n Output Overvoltage Protection
n Micropower Shutdown: IQ = 9μA
n Tiny Thermally Enhanced Leadless (3mm × 3mm)
DFN and 10-lead MSOP Packages
APPLICATIONS
n 1- or 2-Cell Lithium-Ion Powered Devices
n Portable Instruments
n Distributed DC Power Systems
The LTC®3809 is a synchronous step-down switching regu-
lator controller that drives external complementary power
MOSFETs using few external components. The constant
frequency current mode architecture with MOSFET VDS
sensing eliminates the need for a current sense resistor
and improves efficiency.
For noise sensitive applications, the LTC3809 can be exter-
nally synchronized from 250kHz to 750kHz. Burst Mode is
inhibited during synchronization or when the SYNC/MODE
pin is pulled low to reduce noise and RF interference. To
further reduce EMI, the LTC3809 incorporates a novel
spread spectrum frequency modulation technique.
Burst Mode operation provides high efficiency operation
at light loads. 100% duty cycle provides low dropout
operation, extending operating time in battery-powered
systems.
The switching frequency can be programmed up to 750kHz,
allowing the use of small surface mount inductors and
capacitors.
The LTC3809 is available in tiny footprint thermally
enhanced DFN and 10-lead MSOP packages.
L, LT, LTC, LTM 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.
Protected by U.S. Patents including 5481178, 5929620, 6580258, 6304066, 5847554,
6611131, 6498466. Other Patents pending.
TYPICAL APPLICATION
High Efficiency, 550kHz Step-Down Converter
LTC3809
PLLLPF
VIN
VIN
2.75V TO 9.8V
10μF
187k
59k
15k
470pF
SYNC/MODE TG
VFB
SW
ITH
BG
RUN
IPRG
GND
2.2μH
47μF
VOUT
2.5V
2A
3809 TA01
Efficiency and Power Loss vs Load Current
100
10k
EFFICIENCY
VIN = 3.3V
90
1k
VIN = 5V
VIN = 4.2V
80
100
POWER LOSS
70
VIN = 4.2V
10
60
50
1
1
FIGURE 10 CIRCUIT
VOUT = 2.5V
0.1
10
100
1000 10000
LOAD CURRENT (mA)
3809 TA01b
3809fc
1


Linear Technology Electronic Components Datasheet

LTC3809EMSE Datasheet

Synchronous DC/DC Controller

No Preview Available !

LTC3809
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN) ........................ –0.3V to 10V
PLLLPF, RUN, SYNC/MODE,
IPRG Voltages............................... –0.3V to (VIN + 0.3V)
VFB, ITH Voltages...................................... –0.3V to 2.4V
SW Voltage ......................... – 2V to VIN + 1V (10V Max)
TG, BG Peak Output Current (<10μs) ......................... 1A
Operating Temperature Range (Note 2)....–40°C to 85°C
Storage Temperature Range...................–65°C to 125°C
Junction Temperature (Note 3) ............................ 125°C
Lead Temperature (Soldering, 10 sec)
MSOP Package ................................................. 300°C
PIN CONFIGURATION
TOP VIEW
PLLLPF 1
SYNC/MODE 2
VFB 3
ITH 4
RUN 5
10 SW
9 VIN
11
8 TG
7 BG
6 IPRG
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) IS GND
(MUST BE SOLDERED TO PCB)
PLLLPF 1
SYNC/MODE 2
VFB 3
ITH 4
RUN 5
TOP VIEW
11
10 SW
9 VIN
8 TG
7 BG
6 IPRG
MSE PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD (PIN 11) IS GND
(MUST BE SOLDERED TO PCB)
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3809EDD#PBF
LTC3809EDD#TRPBF LBQY
10-Lead (3mm × 3mm) Plastic DFN
LTC3809EMSE#PBF
LTC3809EMSE#TRPBF LTBQT
10-Lead Plastic MSOP
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3809EDD
LTC3809EDD#TR
LBQY
10-Lead (3mm × 3mm) Plastic DFN
LTC3809EMSE
LTC3809EMSE#TR
LTBQT
10-Lead Plastic MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
3809fc
2


Part Number LTC3809EMSE
Description Synchronous DC/DC Controller
Maker Linear Technology
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