LT3436EFE Linear Technology, LT3436EFE Datasheet

IC REG SWITCH 3A 800KHZ 16TSSOP

LT3436EFE

Manufacturer Part Number
LT3436EFE
Description
IC REG SWITCH 3A 800KHZ 16TSSOP
Manufacturer
Linear Technology
Type
Step-Up (Boost)r
Datasheet

Specifications of LT3436EFE

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.2 ~ 34 V
Current - Output
3A
Frequency - Switching
800kHz
Voltage - Input
3 ~ 25 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT3436EFE
Manufacturer:
LT
Quantity:
1 899
Part Number:
LT3436EFE
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT3436EFE#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT3436EFE#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
DSL Modems
Portable Computers
Battery-Powered Systems
Distributed Power
Constant 800kHz Switching Frequency
Wide Operating Voltage Range: 3V to 25V
High Efficiency 0.1Ω/3A Switch
1.2V Feedback Reference Voltage
±2% Overall Output Voltage Tolerance
Uses Low Profile Surface Mount External
Components
Low Shutdown Current: 11µA
Synchronizable from 1MHz to 1.4MHz
Current-Mode Control
Constant Maximum Switch Current Rating
at All Duty Cycles*
Available in a Small Thermally Enhanced
TSSOP-16 Package
INPUT
MAXIMUM OUTPUT CURRENT IS SUBJECT TO THERMAL DERATING.
CERAMIC
5V
4.7µF
OPEN
HIGH
= ON
OR
U
V
SHDN
SYNC
IN
5V to 12V Boost Converter
LT3436
3.9µH
GND
U
V
C
V
4.7k
SW
FB
10nF
B220A
470pF
90.9k
10k
1%
DESCRIPTIO
The LT
regulator. A high efficiency 3A, 0.1Ω switch is included on
the die together with all the control circuitry required to
complete a high frequency, current-mode switching regu-
lator. Current-mode control provides fast transient re-
sponse and excellent loop stability.
New design techniques achieve high efficiency at high
switching frequencies over a wide operating range. A low
dropout internal regulator maintains consistent perfor-
mance over a wide range of inputs from 24V systems to Li-
Ion batteries. An operating supply current of 1mA main-
tains high efficiency, especially at lower output currents.
Shutdown reduces quiescent current to 11µA. Maximum
switch current remains constant at all duty cycles. Syn-
chronization capability allows an external logic level signal
to increase the internal oscillator from 1MHz to 1.4MHz.
Full cycle-by-cycle switch current limit protection and ther-
mal shutdown are provided. High frequency operation al-
lows the reduction of input and output filtering components
and permits the use of tiny chip inductors. The LT3436 is
available in an exposed pad, 16-pin TSSOP package.
All other trademarks are the property of their respective owners.
*Protectd by U.S. Patents including 6535042, 6611131, 6498466
3436 TA01
, LTC and LT are registered trademarks of Linear Technology Corporation.
22µF
CERAMIC
OUTPUT
12V
0.9A
®
3436 is an 800kHz monolithic boost switching
Switching Regulator
3A, 800kHz Step-Up
U
90
85
80
75
70
65
60
0
V
V
IN
OUT
0.1
Efficiency vs Load Current
= 5V
= 12V
0.2
LOAD CURRENT (A)
0.3
0.4
0.5
LT3436
0.6
0.7
3436 TA01b
0.8
3436fa
1

Related parts for LT3436EFE

LT3436EFE Summary of contents

Page 1

... The LT3436 is available in an exposed pad, 16-pin TSSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Protectd by U.S. Patents including 6535042, 6611131, 6498466 ...

Page 2

... FB Duty Cycle = 1.2V 350mA 1.2V SHDN = 60mV Above Threshold SHDN = 100mV Below Threshold I = 1mA SYNC U W INFORMATION ORDER PART NUMBER TOP VIEW 1 16 GND LT3436EFE 3 14 SYNC PART MARKING 6 11 SHDN GND 3436EFE FE PACKAGE = 125°C, θ = 45°C/W, JA θ = 10°C/W ...

Page 3

ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT3436E is guaranteed to meet performance specifications from 0°C to 125°C. Specifications over the – 40°C to ...

Page 4

LT3436 W U TYPICAL PERFOR A CE CHARACTERISTICS SHDN Supply Current 300 T = 25° 15V IN 250 200 150 100 0.2 0.4 0.6 0.8 1.0 1.2 1.4 SHDN VOLTAGE (V) 3436 G07 U ...

Page 5

W BLOCK DIAGRAM The LT3436 is a constant frequency, current-mode boost converter. This means that there is an internal clock and two feedback loops that control the duty cycle of the power switch. In addition to the normal error amplifier, ...

Page 6

LT3436 U U APPLICATIONS INFORMATION FB RESISTOR NETWORK The suggested resistance (R2) from FB to ground is 10k 1%. This reduces the contribution of FB input bias current to output voltage to less than 0.2%. The formula for the resistor ...

Page 7

U U APPLICATIONS INFORMATION INDUCTOR CHOICE AND MAXIMUM OUTPUT CURRENT When choosing an inductor, there are 2 conditions that limit the minimum inductance; required output current, and avoidance of subharmonic oscillation. The maximum output current for the LT3436 in a ...

Page 8

LT3436 U U APPLICATIONS INFORMATION CATCH DIODE The suggested catch diode (D1 B220A Schottky rated at 2A average forward current and 20V reverse voltage. Typical forward voltage is 0.5V at 2A. The diode conducts current only ...

Page 9

U U APPLICATIONS INFORMATION SYNCHRONIZATION The SYNC pin, is used to synchronize the internal oscilla- tor to an external signal. The SYNC input must pass from a logic level low, through the maximum synchronization threshold with a duty cycle between ...

Page 10

LT3436 U U APPLICATIONS INFORMATION INPUT 5V C3 4.7µF CERAMIC † MAXIMUM OUTPUT CURRENT IS SUBJECT TO THERMAL DERATING. D1 MINIMIZE LT3436, C1, D1 LOOP V OUT KELVIN SENSE V OUT Figure 6. Typical Application and Suggested Layout (Topside Only ...

Page 11

U U APPLICATIONS INFORMATION The inductor must have a rating greater than its peak operating current to prevent saturation resulting in effi- ciency loss. Peak inductor current is given by OUT OUT ...

Page 12

LT3436 U TYPICAL APPLICATIO OFF 20V 20V + C1 OPT GND OPTION: REPLACE L1, L2 WITH TRANSFORMER CTX5-1A, CTX8-1A, CTX10-2A Maximum Load Current Increases with Input Voltage 2.0 1.8 ...

Page 13

U TYPICAL APPLICATIO S OFF + C1 4.7µF 20V Boost Converter Drives Luxeon III 1A 3.6V White LED with 70% Efficiency V IN 3.3V TO 4.2V LED ON 4.7µF X5R 6.3V CERAMIC GND Q1: MMBT2222A Q2: FMMT3906 L1: CDRH6D28-3R0 4V-9V ...

Page 14

LT3436 U TYPICAL APPLICATIO S + SINGLE Li-Ion CELL SEPIC Converter Drives 5W LumiLEDs Luxeon V White LEDs at 70% Efficiency V IN 3.6V TO 17V LED ON C1 4.7µF X5R 25V CERAMIC GND Q1: DIODES, INC. MMBT2222A L1: CDRH6D28 ...

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 16-Lead Plastic TSSOP (4 ...

Page 16

... V = 35V 1.8mA, IN OUT(MAX 34V 3.2mA, OUT(MAX 25V 35V 0.9mA, IN OUT(MAX 0.85V to 5V 5V, IN OUT(MAX) = <1µA, ThinSOT Package SD = 0. 38µA, IN OUT(MAX 0. 38µA, IN OUT(MAX) Q LT/LWI/LT 0505 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2003 3436fa ...

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