LTC3416EFE Linear Technology, LTC3416EFE Datasheet

IC REG SYNC 4A STEPDOWN 20TSSOP

LTC3416EFE

Manufacturer Part Number
LTC3416EFE
Description
IC REG SYNC 4A STEPDOWN 20TSSOP
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LTC3416EFE

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.8 ~ 5 V
Current - Output
4A
Frequency - Switching
1MHz
Voltage - Input
2.25 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC3416EFE
Manufacturer:
LT/凌特
Quantity:
20 000
Part Number:
LTC3416EFE#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
High Efficiency: Up to 95%
4A Output Current
Low R
Tracking Input to Provide Easy Supply Sequencing
Programmable Frequency: 300kHz to 4MHz
2.25V to 5.5V Input Voltage Range
±2% Output Voltage Accuracy
0.8V Reference Allows Low Output Voltage
Low Dropout Operation: 100% Duty Cycle
Power Good Output Voltage Monitor
Overtemperature Protected
Available in a 20-Lead Thermally Enhanced
TSSOP Package
Portable Instruments
Notebook Computers
Distributed Power Systems
Battery-Powered Equipment
POL Board Power
2.5V TO 5.5V
Figure 1a. 2.5V/4A Step-Down Regulator with Tracking
V
IN
DS(ON)
Internal Switch: 67mΩ
I/O VOLTAGE
U
127k
7.5k
820pF
255k
200k
R
RUN/SS
I
TRACK
TH
SVIN
T
LTC3416
V
2.5V
PGOOD
PVIN
OUT2
PGND
SGND
V
FB
SW
U
200k
255k
0.2µH
22µF
3416 F01a
100µF
×2
V
1.8V
4A
OUT1
DESCRIPTIO
The LTC
nous, step-down DC/DC converter utilizing a constant
frequency, current mode architecture. It operates from an
input voltage range of 2.25V to 5.5V and provides a
regulated output voltage from 0.8V to 5V while delivering
up to 4A of output current. The internal synchronous
power switch with 67mΩ of on-resistance increases effi-
ciency and eliminates the need for an external Schottky
diode. Switching frequency is set by an external resistor.
100% duty cycle provides low dropout operation extend-
ing battery life in portable systems. OPTI-LOOP
sation allows the transient response to be optimized over
a wide range of loads and output capacitors.
The LTC3416 operates in forced continuous operation and
provides tracking of another power supply rail. Forced
continuous operation reduces noise and RF interference and
provides excellent transient response. Fault protection is
provided by an overcurrent comparator, and adjustable
compensation allows the transient response to be optimized
over a wide range of loads and output capacitors.
trademarks are the property of their respective owners. OPTI-LOOP is a registered trade-
mark of Linear Technology Corporation. Protected by U.S. Patents including 5481178,
6580258, 6304066, 6127815, 6498466, 6611131, 6724174.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
Synchronous Step-Down
Regulator with Tracking
®
3416 is a high efficiency monolithic synchro-
4A, 4MHz, Monolithic
100
Figure 1b. Efficiency vs Load Current
90
80
70
60
40
30
20
10
50
0
0.01
U
V
IN
= 2.5V
0.10
LOAD CURRENT (A)
V
IN
= 3.3V
1
V
f = 2MHz
OUT
LTC3416
= 1.8V
3416 G09
10
®
compen-
3416fa
1

Related parts for LTC3416EFE

LTC3416EFE Summary of contents

Page 1

... LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. OPTI-LOOP is a registered trade- mark of Linear Technology Corporation. Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131, 6724174. 22µ ...

Page 2

... Measured in Servo Loop 0.84V ITH (Note 0.7V 1.2V FB ITH RUN R = 294kΩ OSC (Note 300mA –300mA 0V 5.5V RUN ORDER PART NUMBER 20 PGND LTC3416EFE PGOOD PGND = 10°C/W JC http://www.linear.com/leadfree/ MIN TYP MAX UNITS 2.25 5.5 ● 0.784 0.800 0.816 0.2 0.2 0.04 0.2 ...

Page 3

ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. The voltage should never exceed 6.0V for any pin. Note 2: The LTC3416E is guaranteed to meet performance specifications from ...

Page 4

LTC3416 W U TYPICAL PERFOR A CE CHARACTERISTICS Frequency vs Temperature 1090 V = 3.3V IN 1070 R = 294k OSC 1050 1030 1010 990 970 950 930 910 –40 – 100 120 60 TEMPERATURE (°C) ...

Page 5

CTIO S PGND (Pins 1, 10, 11, 20): Power Ground. Connect this pin closely to the (–) terminal (Pin 2): Oscillator Resistor Input. Connecting a resistor T to ground from this ...

Page 6

LTC3416 CTIO AL DIAGRA SV SGND VOLTAGE REFERENCE TRACK 3 + – ERROR V AMPLIFIER 0.74V – + – 0.86V RUN/SS 4 RUN PGOOD 17 U OPERATIO Main Control Loop The ...

Page 7

U OPERATIO power MOSFET is turned off and the bottom power MOS- FET is switched on until either the overvoltage condition clears or the bottom MOSFET’s current limit is reached. Voltage Tracking Some microprocessors, ASIC and DSP chips need two ...

Page 8

LTC3416 U U APPLICATIO S I FOR ATIO The basic LTC3416 application circuit is shown in Figure 1a. External component selection is determined by the maxi- mum load current and begins with the selection of the operating frequency and inductor ...

Page 9

U U APPLICATIO S I FOR ATIO prevent large voltage transients from occurring, a low ESR input capacitor sized for the maximum RMS current should be used. The maximum RMS current is given by OUT ...

Page 10

LTC3416 U U APPLICATIO S I FOR ATIO coincidentally or ratiometrically track another output volt- age as shown in Figure 3. If the voltage on the TRACK pin is less than 0.8V, voltage tracking is enabled. During voltage tracking, the ...

Page 11

U U APPLICATIO S I FOR ATIO MASTER V FB LTC3416 SGND SLAVE V TRACK FB LTC3416 SGND Figure 5. Dual Voltage System with Tracking An alternative method of tracking is shown in Figure 5. For the circuit of Figure ...

Page 12

LTC3416 U U APPLICATIO S I FOR ATIO The R for both the top and bottom MOSFETs can DS(ON) be obtained from the Typical Performance Characteris- 2 tics curves. Thus, to obtain I R losses, simply add ...

Page 13

U U APPLICATIO S I FOR ATIO C and C should be sized for a maximum current IN1 IN2 rating of: ⎛ ⎞ ⎜ ⎟ – 1 ...

Page 14

LTC3416 U U APPLICATIO S I FOR ATIO PC Board Layout Checklist When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the LTC3416. Check the following in your layout ...

Page 15

... DIMENSIONS ARE IN 3. DRAWING NOT TO SCALE 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 Package 20-Lead Plastic TSSOP (4 ...

Page 16

... IN OUT REF < 1µA, TSSOP16E Package SD : 2.25V to 5V 0.8V 64µA, IN OUT Q : 5.5V to 60V 1.2V, IN OUT < 25µA, TSSOP16E Package SD : 2.5V to 5.5V 2.5V, IN OUT < 1µA, MS Package SD LT 1205 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2004 10 4316 TA02 3416fa ...

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