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LTC3736-2

Description
Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking
File Size399KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3736-2 Overview

Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking

LTC3736-2
Dual 2-Phase, No R
SENSE
TM
,
Synchronous Controller
with Output Tracking
DESCRIPTIO
The LTC
®
3736-2 is a 2-phase dual synchronous step-down
switching regulator controller with tracking that drives ex-
ternal complementary power MOSFETs using few external
components. The constant frequency current mode archi-
tecture with MOSFET V
DS
sensing eliminates the need for
sense resistors and improves efficiency. Power loss and
noise due to the ESR of the input capacitance are mini-
mized by operating the two controllers out of phase.
Pulse-skipping operation provides high efficiency at light
loads. 100% duty cycle capability 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 ca-
pacitors. For noise sensitive applications, the LTC3736-2
switching frequency can be externally synchronized from
250kHz to 850kHz. An internal soft-start, which can be
lengthened externally, smoothly ramps the output voltage
during start-up.
The LTC3736-2 is available in the tiny thermally enhanced
(4mm
×
4mm) QFN and 24-lead narrow SSOP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R
SENSE
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, 6144194, 6580258, 6304066, 6611131, 6498466.
FEATURES
No Current Sense Resistors Required
Out-of-Phase Controllers Reduce Required
Input Capacitance
Tracking Function
Wide V
IN
Range: 2.75V to 9.8V
0.6V
±1%
Voltage Reference
High Current Limit
Constant Frequency Current Mode Operation
Low Dropout Operation: 100% Duty Cycle
True PLL for Frequency Locking or Adjustment
Selectable Pulse-Skipping/Forced Continuous
Operation
Auxiliary Winding Regulation
Internal Soft-Start Circuitry
Power-Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: I
Q
= 9µA
Tiny Low Profile (4mm
×
4mm) QFN and Narrow
SSOP Packages
APPLICATIO S
One or Two Lithium-Ion Powered Devices
Notebook and Palmtop Computers, PDAs
Portable Instruments
Distributed DC Power Systems
TYPICAL APPLICATIO
High Efficiency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter
V
IN
2.75V TO 9.8V
V
IN
SENSE1 SENSE2
TG1
2.2µH
+
+
Efficiency and Power Loss
vs Load Current (Figure 15 Circuit)
100
95
90
85
V
OUT
= 2.5V
10
10µF
×2
EFFICIENCY (%)
TG2
2.2µH
SW1
SW2
LTC3736-2
BG1
BG2
PGND
V
FB2
I
TH2
SGND
15k
220pF
15k
PGND
V
FB1
220pF
59k
I
TH1
V
OUT1
2.5V
187k
118k
V
OUT2
1.8V
47µF
47µF
59k
37362 TA01a
U
80
75
70
65
60
55
50
U
U
EFFICIENCY
1
POWER LOSS (W)
0.1
POWER LOSS
0.01
1
10
100
1000
LOAD CURRENT (mA)
0.001
10000
37362 TA01b
37362fa
1

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