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Linear Technology Electronic Components Datasheet

LTC3832-1ES8 Datasheet

High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation

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LTC3832/LTC3832-1
High Power Step-Down
Synchronous DC/DC Controllers
for Low Voltage Operation
FEATURES
s VOUT as Low as 0.6V
s High Power Switching Regulator Controller
for 3.3V-5V to 0.6V-3.xV Step-Down Applications
s No Current Sense Resistor Required
s Low Input Supply Voltage Range: 3V to 8V
s Maximum Duty Cycle > 91% Over Temperature
s All N-Channel External MOSFETs
s Excellent Output Regulation: ±1% Over Line, Load
and Temperature Variations
s High Efficiency: Over 95% Possible
s Adjustable or Fixed 2.5V Output (LTC3832)
s Programmable Fixed Frequency Operation: 100kHz to
500kHz
s External Clock Synchronization
s Soft-Start
s Low Shutdown Current: <10µA
s Overtemperature Protection
s Available in SO-8 and SSOP-16 Packages
U
APPLICATIO S
s CPU Power Supplies
s Multiple Logic Supply Generator
s Distributed Power Applications
s High Efficiency Power Conversion
DESCRIPTIO
The LTC®3832/LTC3832-1 are high power, high effi-
ciency switching regulator controllers optimized for
3.3V-5V to 0.6V-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 LTC3832/LTC3832-1 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 MOSFET, providing an adjustable current limit
without a current sense resistor.
The LTC3832/LTC3832-1 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 300kHz
free-running clock frequency can be externally adjusted or
synchronized with an external signal from 100kHz to 500kHz.
In shutdown mode, the LTC3832 supply current drops to
<10µA. The LTC3832-1 is the SO-8 version without current
limit, frequency adjustment and shutdown functions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
4.7µF
0.1µF
0.01µF
LTC3832-1
SS VCC/PVCC2
COMP
G1
15k
6.49k
GND PVCC1
FB
G2
5.1
VIN
3V TO 7V
+
MBR0520T1
0.1µF
Si9426DY L1
3.2µH
Si9426DY
+
4.32k
680pF
L1: SUMIDA CDEP105-3R2MC-88
COUT: PANASONIC EEFUEOD271R
VOUT
1V
9A
COUT
270µF
2V
3832 F01
Figure 1. High Efficiency 3.3V to 1V Power Converter
Efficiency
100
90
VOUT = 2.5V
80
VOUT = 1V
70
60
50
VIN = 3.3V
40
0 1 2 3 4 5 6 7 8 9 10
LOAD CURRENT (A)
3832 F01b
sn3832 3832fs
1


Linear Technology Electronic Components Datasheet

LTC3832-1ES8 Datasheet

High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation

No Preview Available !

LTC3832/LTC3832-1
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 ........................................... 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
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
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 130°C/ W
ORDER PART
NUMBER
LTC3832EGN
GN
PART MARKING
3832
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
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC3832-1ES8
S8
PART MARKING
38321
ELECTRICAL CHARACTERISTICS The q 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
q3
5
8
V
q3
13.2
V
2.4
2.9
V
0.595 0.6 0.605
V
q 0.593 0.6 0.607
V
VOUT
Output Voltage
VCOMP = 1.25V
2.462 2.5 2.538
V
q 2.450 2.5 2.550
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
2
sn3832 3832fs


Part Number LTC3832-1ES8
Description High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation
Maker Linear Technology
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Linear Technology





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