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LT3436EFE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT3436
3436fa
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
3A, 800kHz Step-Up
Switching Regulator
■
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
The LT
®
3436 is an 800kHz monolithic boost switching
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.
■
DSL Modems
■
Portable Computers
■
Battery-Powered Systems
■
Distributed Power
Efficiency vs Load Current
5V to 12V Boost Converter
LT3436
V
IN
OUTPUT
12V
0.9A
†
INPUT
5V
3436 TA01
10nF
470pF
4.7k
10k
1%
90.9k
B220A
22µF
CERAMIC
4.7µF
CERAMIC
V
SW
FBSHDN
OPEN
OR
HIGH
= ON
GND
V
C
SYNC
†
MAXIMUM OUTPUT CURRENT IS SUBJECT TO THERMAL DERATING.
3.9µH
LOAD CURRENT (A)
EFFICIENCY (%)
3436 TA01b
90
85
80
75
70
65
60
0
0.2
0.4
0.5
0.1 0.3
0.6
0.7
0.8
V
IN
= 5V
V
OUT
= 12V
, 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
2
LT3436
3436fa
PARAMETER CONDITION MIN TYP MAX UNITS
Recommended Operating Voltage ● 325V
Maximum Switch Current Limit ● 346 A
Oscillator Frequency 3.3V < V
IN
< 25V ● 640 800 960 kHz
Switch On Voltage Drop I
SW
= 3A ● 330 550 mV
V
IN
Undervoltage Lockout (Note 3) ● 2.47 2.6 2.73 V
V
IN
Supply Current I
SW
= 0A ● 1 1.3 mA
V
IN
Supply Current/I
SW
I
SW
= 3A 15 mA/A
Shutdown Supply Current V
SHDN
= 0V, V
IN
= 25V, V
SW
= 25V 11 25 µA
● 45 µA
Feedback Voltage 3V < V
IN
< 25V, 0.4V < V
C
< 0.9V 1.182 1.2 1.218 V
● 1.176 1.224 V
FB Input Current ● 0 –0.2 – 0.4 µA
FB to V
C
Voltage Gain 0.4V < V
C
< 0.9V 150 350
FB to V
C
Transconductance ∆I
VC
= ±10µA ● 500 850 1300 µMho
V
C
Pin Source Current V
FB
= 1V ● – 85 – 120 –165 µA
V
C
Pin Sink Current V
FB
= 1.4V ● 70 110 165 µA
V
C
Pin to Switch Current Transconductance 4.8 A/V
V
C
Pin Minimum Switching Threshold Duty Cycle = 0% 0.3 V
V
C
Pin 3A I
SW
Threshold 0.9 V
Maximum Switch Duty Cycle V
C
= 1.2V, I
SW
= 350mA 85 90 %
V
C
= 1.2V, I
SW
= 1A ● 80 %
SHDN Threshold Voltage ● 1.28 1.35 1.42 V
SHDN Input Current (Shutting Down) SHDN = 60mV Above Threshold ● –7 –10 –13 µA
SHDN Threshold Current Hysteresis SHDN = 100mV Below Threshold 4 7 10 µA
SYNC Threshold Voltage 1.5 2.2 V
SYNC Input Frequency 1 1.4 MHz
SYNC Pin Resistance I
SYNC
= 1mA 20 kΩ
ABSOLUTE MAXIMUM RATINGS
W
WW
U
ELECTRICAL CHARACTERISTICS
PACKAGE/ORDER INFORMATION
W
U
U
Input Voltage .......................................................... 25V
Switch Voltage ......................................................... 35V
SHDN Pin ............................................................... 25V
FB Pin Current ....................................................... 1mA
SYNC Pin Current .................................................. 1mA
Operating Junction Temperature Range (Note 2)
LT3436E .......................................... – 40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART NUMBER
(Note 1)
T
JMAX
= 125°C, θ
JA
= 45°C/W,
θ
JC(PAD)
= 10°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
3436EFE
FE PART MARKING
LT3436EFE
The ● denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, V
C
= 0.8V, SHDN, SYNC and switch open unless otherwise noted.
FE PACKAGE
16-LEAD PLASTIC TSSOP
EXPOSED PAD IS GND (PIN 17),
MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
GND
V
IN
SW
SW
GND
GND
NC
GND
GND
NC
SYNC
V
C
FB
SHDN
NC
GND
17
3
LT3436
3436fa
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 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Minimum input voltage is defined as the voltage where the internal
regulator enters lockout. Actual minimum input voltage to maintain a
regulated output will depend on output voltage and load current. See
Applications Information.
TYPICAL PERFORMANCE CHARACTERISTICS
UW
FB Voltage
Switch On Voltage Drop Oscillator Frequency
SHDN Input Current
SHDN Threshold
SHDN Supply Current
ELECTRICAL CHARACTERISTICS
TEMPERATURE (°C)
–50
FB VOLTAGE (V)
100
3436 G01
050
1.220
1.215
1.210
1.205
1.200
1.195
1.190
1.185
1.180
–25 25 75 125
SWITCH CURRENT (A)
0
SWITCH VOLTAGE (mV)
0.5
1.0
1.5 2.0
3436 G02
2.5
500
450
400
350
300
250
200
150
100
50
0
3.0
TEMPERATURE (°C)
–50
OSCILLATOR FREQUENCY (kHz)
100
3436 G03
050
920
890
860
830
800
770
740
710
680
–25 25 75 125
SHDN THRESHOLD (V)
1.40
1.38
1.36
1.34
1.32
1.30
3436 G04
INPUT VOLTAGE (V)
V
IN
CURRENT (µA)
14
12
10
8
6
4
2
0
3436 G05
0
5
10 15 20 25 30
TEMPERATURE (°C)
–50
SHDN INPUT CURRENT (µA)
–12
–10
–8
–6
–4
–2
0
25 75
3436 G06
–25 0
50 100 125
T
A
= 125°C
T
A
= 25°C
T
A
= –40°C
TEMPERATURE (°C)
–50 100
050–25 25 75 125
T
A
= 25°C
SHDN = 0V
SHUTTING DOWN
STARTING UP
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT3436EFE#PBF

Mfr. #:
Buy LT3436EFE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 3A, 800kHz Boost Sw Reg
Lifecycle:
New from this manufacturer.
Delivery:
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