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LTC3830-1ES8 Datasheet

High Power Step-Down Synchronous DC/DC Controllers

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LTC3830/LTC3830-1
High Power Step-Down
Synchronous DC/DC Controllers
for Low Voltage Operation
FEATURES
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: ±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 (16-Pin Version and LTC3830-1)
Low Shutdown Current: <10µA
Overtemperature Protection
Available in S8, S16 and SSOP-16 Packages
U
APPLICATIO S
CPU Power Supplies
Multiple Logic Supply Generator
Distributed Power Applications
High Efficiency Power Conversion
DESCRIPTIO
The LTC®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
±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
<10µA. 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.
TYPICAL APPLICATIO
4.7µF
0.1µF
0.01µF
15k
12.7k 1%
LTC3830-1
SS PVCC2
G1
COMP
GND PVCC1
FB
G2
5.36k 1%
VIN
3V TO 6V
5.1
+ 220µF
10V
MBR0520T1
M1
Si7806DN
0.1µF
L
3.2µH
M2
Si7806DN
B320A +
3.3nF
L: SUMIDA CDEP105-3R2MC-88
COUT: PANASONIC EEFUEOD271R
1.8V
9A
COUT
270µF
2V
3830 F01
Figure 1. High Efficiency 3V-6V to 1.8V Power Converter
Efficiency and Power Loss vs Load Current
4.0
100
3.5
90
3.0
80
2.5
70
2.0
60
1.5
50
1.0
40
0.5
VIN = 3.3V 30
VOUT = 1.8V
0
20
0 1 2 3 4 5 6 7 8 9 10
LOAD CURRENT (A)
3830 TA02
3830fa
1


Linear Technology Electronic Components Datasheet

LTC3830-1ES8 Datasheet

High Power Step-Down Synchronous DC/DC Controllers

No Preview Available !

LTC3830/LTC3830-1
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltage
VCC ....................................................................... 9V
PVCC1,2 ................................................................ 14V
Input Voltage
IFB, IMAX ............................................... – 0.3V to 14V
SENSE+, SENSE, FB,
SHDN, FREQSET ....................... – 0.3V to VCC + 0.3V
Junction Temperature (Note 11) ........................... 125°C
Operating Temperature Range (Note 9) .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
G1 1
PVCC1 2
GND 3
FB 4
8 G2
7 VCC/PVCC2
6 COMP
5 SHDN
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 130°C/ W
TOP VIEW
G1 1
PVCC1 2
GND 3
FB 4
8 G2
7 VCC/PVCC2
6 COMP
5 SS
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 130°C/ W
ORDER PART
NUMBER
LTC3830ES8
S8
PART MARKING
3830
ORDER PART
NUMBER
LTC3830-1ES8
S8
PART MARKING
38301
TOP VIEW
G1 1
PVCC1 2
PGND 3
GND 4
SENSE5
FB 6
SENSE+ 7
SHDN 8
16 G2
15 PVCC2
14 VCC
13 IFB
12 IMAX
11 FREQSET
10 COMP
9 SS
GN PACKAGE
S PACKAGE
16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 130°C/ W (GN)
TJMAX = 125°C, θJA = 100°C/ W (S)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC3830EGN
LTC3830ES
GN PART
MARKING
3830
ELECTRICAL CHARACTERISTICS The denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VCC, PVCC1, PVCC2 = 5V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC
PVCC
VUVLO
VFB
Supply Voltage
PVCC1, PVCC2 Voltage
Undervoltage Lockout Voltage
Feedback Voltage
(Note 7)
VCOMP = 1.25V
3
5
8
V
3
13.2
V
2.4
2.9
V
1.255 1.265 1.275
V
1.252 1.265 1.278
V
VOUT
Output Voltage
VCOMP = 1.25V
3.250 3.3 3.350
V
3.235 3.3 3.365
V
VOUT
Output Load Regulation
Output Line Regulation
IOUT = 0A to 10A (Note 6)
VCC = 4.75V to 5.25V
2
mV
0.1
mV
3830fa
2


Part Number LTC3830-1ES8
Description High Power Step-Down Synchronous DC/DC Controllers
Maker Linear Technology
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