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LTC3713EG Datasheet

  • LTC3713EG

  • Low Input Voltage, High Power, No RSENSE Synchronous Buck DC...

  • 24頁

  • LINER

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LTC3713
Low Input Voltage,
High Power, No R
SENSE
TM
Synchronous Buck DC/DC Controller
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
Very Low V
IN(MIN)
: 1.5V
True Current Mode Control
5V Drive for N-Channel MOSFETs Eliminates
Auxillary 5V Supply
No Sense Resistor Required
Uses Standard 5V Logic-Level N-Channel MOSFETs
Adjustable Current Limit
Adjustable Frequency
Switch t
ON(MIN)
< 100ns
2% to 90% Duty Cycle at 200kHz
0.8V
鹵1%
Reference
Power Good Output Voltage Monitor
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Small 24-Lead SSOP Package
The LTC
廬
3713 is a high current, high efficiency synchro-
nous buck switching regulator controller optimized for
use with very low input supply voltages. It operates from
inputs as low as 1.5V and provides a regulated output
voltage from 0.8V up to (0.9)V
IN
. The controller uses
a valley current control architecture to enable high operat-
ing frequencies without requiring a sense resistor.
Operating frequency is selected by an external resistor and
is compensated for variations in V
IN
and V
OUT
. The LTC3713
uses a pair of standard 5V logic-level N-channel external
MOSFETs, eliminating the need for expensive P-channel
or low threshold devices.
Discontinuous mode operation provides high efficiency
operation at light loads. A forced continuous control
pin reduces noise and RF interference, and can assist
secondary winding regulation by disabling discontinuous
operation when the main output is lightly loaded. Fault
protection is provided by internal foldback current limit-
ing, an output overvoltage comparator and an optional
short-circuit shutdown timer.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R
SENSE
is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Telecom Card 3.3V, 2.5V, 1.8V Step-Down
Bus Termination (DDR memory, SSTL)
Synchronous Buck with General Purpose Boost
Low V
IN
Synchronous Boost
TYPICAL APPLICATIO
SHDN
330k
5.6k
I
ON
TG
LTC3713
SW1
V
FB1
10k
SENSE
+
680pF
20k
I
TH
RUN/SS
0.1碌F
PGOOD
SGND
BG
PGND
SENSE
鈥?/div>
INTV
CC
V
IN1
V
IN2
BOOST
CMDSH-3
V
IN
1.8V TO 3.3V
22碌F
脳2
100
0.33碌F
M1
L1
1.8碌H
V
OUT
1.25V
10A
EFFICIENCY (%)
+
M2
B340A
C
OUT
270碌F
脳2
10碌F
3713 F01a
4.7碌F
MBR0520
4.7碌H
12.1k
V
FB2
SW2
37.4k
C
OUT
: PANASONIC EEFUEOD271R
L1: (A) PANASONIC ETQP6FIR8BFA
(B) TOKO D104C-1.8碌H
M1, M2: (A) IRF7822, (B) IRF7811A
Figure 1. High Efficiency Step-Down Converter from 1.8V to 3.3V Input
3713fa
U
Efficiency vs Load Current
90
80
70
60
50
40
30
20
10
0
0.01 0.04 0.10 0.40 1
7
3
LOAD CURRENT (A)
12
15
V
IN
= 2.5V
A
B
3713 F01b
U
U
1

LTC3713EG 產(chǎn)品屬性

  • LTC3713

  • 59

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 1.5MHz

  • 90%

  • 1.5 V ~ 36 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • -40°C ~ 85°C

  • 24-SSOP（0.209"，5.30mm 寬）

  • 管件

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