LTC3832EGN Linear Technology, LTC3832EGN Datasheet

IC DC/DC CTRLR SYNC STPDN 16SSOP

LTC3832EGN

Manufacturer Part Number
LTC3832EGN
Description
IC DC/DC CTRLR SYNC STPDN 16SSOP
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LTC3832EGN

Internal Switch(s)
No
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
2.5V
Current - Output
20A
Frequency - Switching
300kHz
Voltage - Input
3 ~ 8 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC3832EGN
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC3832EGN#PBF
Manufacturer:
Linear Technology
Quantity:
135
Part Number:
LTC3832EGN#TRPBF
Manufacturer:
LT/凌特
Quantity:
20 000
Company:
Part Number:
LTC3832EGN#TRPBF
Quantity:
1 944
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
V
High Power Switching Regulator Controller
for 3.3V-5V to 0.6V-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 2.5V Output (LTC3832)
Programmable Fixed Frequency Operation: 100kHz to
500kHz
External Clock Synchronization
Soft-Start
Low Shutdown Current: <10 A
Overtemperature Protection
Available in SO-8 and SSOP-16 Packages
CPU Power Supplies
Multiple Logic Supply Generator
Distributed Power Applications
High Efficiency Power Conversion
OUT
0.1 F
6.49k
as Low as 0.6V
15k
0.01 F
Figure 1. High Efficiency 3.3V to 1V Power Converter
680pF
4.32k
SS
COMP
GND
FB
LTC3832-1
U
V
CC
/PV
PV
4.7 F
CC2
CC1
G1
G2
L1: SUMIDA CDEP105-3R2MC-88
C
OUT
: PANASONIC EEFUEOD271R
5.1
U
MBR0520T1
3V TO 7V
0.1 F
V
IN
Si9426DY
Si9426DY
+
3.2 H
L1
+
Synchronous DC/DC Controllers
3832 F01
C
270 F
2V
OUT
DESCRIPTIO
The LTC
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
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
<10 A. The LTC3832-1 is the SO-8 version without current
limit, frequency adjustment and shutdown functions.
1% output regulation over temperature, load current
V
1V
9A
, LTC and LT are registered trademarks of Linear Technology Corporation.
OUT
for Low Voltage Operation
®
3832/LTC3832-1 are high power, high effi-
High Power Step-Down
U
100
LTC3832/LTC3832-1
90
80
70
60
50
40
0
V
IN
1
= 3.3V
2
V
OUT
3
LOAD CURRENT (A)
Efficiency
= 1V
4
V
OUT
5
= 2.5V
6
7
8
3832 F01b
9
sn3832 3832fs
10
1

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LTC3832EGN Summary of contents

Page 1

... In shutdown mode, the LTC3832 supply current drops to <10 A. 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 ...

Page 2

... U (Note 1) Junction Temperature ........................................... 125 C Operating Temperature Range (Note 9) .. – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 ORDER PART NUMBER LTC3832EGN G1 PV CC1 GND GN FB PART MARKING 3832 T JMAX The denotes specifications that apply over the full operating temperature = 25 C ...

Page 3

ELECTRICAL CHARACTERISTICS range, otherwise specifications are at T SYMBOL PARAMETER I Supply Current VCC I PV Supply Current PVCC CC f Internal Oscillator Frequency OSC Minimum Duty Cycle SAWL COMP Maximum Duty Cycle SAWH ...

Page 4

LTC3832/LTC3832 TYPICAL PERFOR A CE CHARACTERISTICS Load Regulation 2. REFER TO FIGURE 12 2.53 2.52 2.51 2.50 2.49 2.48 2.47 2.46 –10 –5 5 – OUTPUT CURRENT (A) 3832 G01 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Maximum G1 Duty Cycle vs Temperature 100 REFER TO FIGURE –50 – 100 125 TEMPERATURE ...

Page 6

LTC3832/LTC3832 TYPICAL PERFOR A CE CHARACTERISTICS PV Supply Current CC vs Gate Capacitance 12V CC1 CC1 ...

Page 7

CTIO S FREQSET (Pin 11/NA): Frequency Set. Use this pin to adjust the free-running frequency of the internal oscillator. With the pin floating, the oscillator runs at about 300kHz. A resistor from FREQSET to ground ...

Page 8

LTC3832/LTC3832-1 W BLOCK DIAGRA (LTC3832-1) INTERNAL OSCILLATOR COMP QSS + V 2.2V QC 1.2V TEST CIRCUITS SHDN CC SHDN CC2 CC1 FREQSET LTC3832 NC ...

Page 9

U U APPLICATIO S I FOR ATIO Also included in the LTC3832 is an internal soft-start feature that requires only a single external capacitor to operate. In addition, the LTC3832 features an adjustable oscillator that can free run or synchronize ...

Page 10

LTC3832/LTC3832 APPLICATIO S I FOR ATIO remains at a reduced voltage until the overload is re- moved. Serious overloads generate a large overdrive at CC, allowing it to pull SS down quickly and preventing damage to the output ...

Page 11

U U APPLICATIO S I FOR ATIO Connecting a 82k resistor from FREQSET to ground forces 15 A out of the pin, causing the internal oscillator to run at approximately 450kHz. Forcing an external 20 A current into FREQSET cuts ...

Page 12

LTC3832/LTC3832 APPLICATIO S I FOR ATIO CC2 CC1 G1 INTERNAL CIRCUITRY G2 LTC3832 Figure 6. LTC3832 Power Supplies V / CC2 CC1 G1 INTERNAL CIRCUITRY G2 LTC3832-1 Figure 7. LTC3832-1 Power Supplies ...

Page 13

U U APPLICATIO S I FOR ATIO Diagram). This increases the G2 on-time and allows the charge pump capacitors to be refreshed. For applications using an external supply to PV supply must also be higher than V ensure normal operation. ...

Page 14

LTC3832/LTC3832 APPLICATIO S I FOR ATIO Note that the required R for Q2 is roughly three DS(ON) times that this example. Note also that while the required R values suggest large MOSFETs, the DS(ON) power ...

Page 15

U U APPLICATIO S I FOR ATIO requirements. Peak current in the inductor will be equal to the maximum output load current plus half of the peak-to- peak inductor ripple current. Ripple current is set by the inductor value, the ...

Page 16

LTC3832/LTC3832 APPLICATIO S I FOR ATIO LTC3832 application might exhibit 5A input ripple cur- rent. Sanyo OS-CON capacitors, part number 10SA220M (220 F/10V), feature 2.3A allowable ripple current three in parallel at the input (to ...

Page 17

U U APPLICATIO S I FOR ATIO between the top of the resistor divider network and the V pin to create a pole-zero pair in the loop compensation. The zero location is prior to the pole location and thus, phase ...

Page 18

LTC3832/LTC3832 APPLICATIO S I FOR ATIO 1. In general, layout should begin with the location of the power devices. Be sure to orient the power circuitry so that a clean power flow path is achieved. Conductor widths should ...

Page 19

U U APPLICATIO S I FOR ATIO OPTIONAL D Z 12V 1N5242 + 10 F 100 + 1 F 4 SHDN 180pF 18k C C 1500pF W U 1N5817 1N5817 0.1 F 5.6k ...

Page 20

LTC3832/LTC3832-1 U TYPICAL APPLICATIO 3. 330 2 SHUTDOWN 68pF 6. 0. Typical 3.3V to 5V, 5A ...

Page 21

U TYPICAL APPLICATIO S Typical 3.3V to – 5V, 5A Positive-to-Negative Converter 100 0.01 F 8.2V NC SHUTDOWN 15k C1 180pF C C 1.5nF V IN 3.3V MBR0520 3.5k ...

Page 22

LTC3832/LTC3832-1 PACKAGE DESCRIPTIO .254 MIN .0165 .0015 RECOMMENDED SOLDER PAD LAYOUT .007 – .0098 (0.178 – 0.249) .016 – .050 (0.406 – 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) 3. DRAWING NOT TO SCALE *DIMENSION ...

Page 23

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 24

... Low Input Voltage, High Power Synchronous Controller LTC3831 High Power Synchronous Switching Regulator Controller for DDR Memory Termination trademark of Linear Technology Corporation. SENSE Linear Technology Corporation 24 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 Typical 5V to 3.3V, 10A Application ...

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