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LTC3830EGN Datasheet

  • LTC3830EGN

  • High Power Step-Down Synchronous DC/DC Controllers for Low V...

  • 24頁

  • LINER

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LTC3830/LTC3830-1
High Power Step-Down
Synchronous DC/DC Controllers
for Low Voltage Operation
FEATURES
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
High Power Switching Regulator Controller
for 3.3V-5V to 1.xV-3.xV Step-Down Applications
No Current Sense Resistor Required
Low Input Supply Voltage Range: 3V to 8V
Maximum Duty Cycle > 91% Over Temperature
All N-Channel External MOSFETs
Excellent Output Regulation:
鹵1%
Over Line, Load
and Temperature Variations
High Efficiency: Over 95% Possible
Adjustable or Fixed 3.3V Output (16-Pin Version)
Programmable Fixed Frequency Operation: 100kHz to
500kHz
External Clock Synchronization
Soft-Start (Some Versions)
Low Shutdown Current: <10碌A(chǔ)
Overtemperature Protection
Available in S8, S16 and SSOP-16 Packages
The LTC
廬
3830/LTC3830-1 are high power, high effi-
ciency switching regulator controllers optimized for
3.3V-5V to 1.xV-3.xV step-down applications. A preci-
sion internal reference and feedback system provide
鹵1%
output regulation over temperature, load current
and line voltage variations. The LTC3830/LTC3830-1 use
a synchronous switching architecture with N-channel
MOSFETs. Additionally, the chip senses output current
through the drain-source resistance of the upper
N-channel FET, providing an adjustable current limit
without a current sense resistor.
The LTC3830/LTC3830-1 operate with an input supply
voltage as low as 3V and with a maximum duty cycle of
>91% over temperature. They include a fixed frequency
PWM oscillator for low output ripple operation. The 200kHz
free-running clock frequency can be externally adjusted or
synchronized with an external signal from 100kHz to 500kHz.
In shutdown mode, the LTC3830 supply current drops to
<10碌A(chǔ). The LTC3830-1 differs from the LTC3830 S8 ver-
sion by replacing shutdown with a soft-start function.
For a similar, pin compatible DC/DC converter with an
output voltage as low as 0.6V, please refer to the LTC3832.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
CPU Power Supplies
Multiple Logic Supply Generator
Distributed Power Applications
High Efficiency Power Conversion
TYPICAL APPLICATIO
4.7碌F
V
IN
3V TO 8V
5.1鈩?/div>
+
0.1碌F
0.01碌F
15k
GND PV
CC1
12.7k 1%
FB
5.36k 1%
3.3nF
L: SUMIDA CDEP105-3R2MC-88
C
OUT
: PANASONIC EEFUEOD271R
G2
4.7碌F
LTC3830-1
PV
CC2
SS
COMP
G1
12V
100
220碌F
10V
90
80
70
60
50
40
0
1
2
3 4 5 6 7
LOAD CURRENT (A)
M1
Si7806DN
L
3.2碌H
1.8V
9A
M2
Si7806DN
B320A
+
C
OUT
270碌F
2V
3830 F01
EFFICIENCY (%)
Figure 1. High Efficiency 3V-8V to 1.8V Power Converter
U
Efficiency
V
IN
= 3.3V
V
OUT
= 1.8V
8
9
10
3830 TA02
U
U
sn3830 3830fs
1

LTC3830EGN 產(chǎn)品屬性

  • LTC3830/-1

  • 100

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電壓模式

  • 1

  • 250kHz

  • 95%

  • 3 V ~ 8 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • -40°C ~ 85°C

  • 16-SSOP（0.154"，3.90mm 寬）

  • 管件

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