lt8410-1 Linear Technology Corporation, lt8410-1 Datasheet

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lt8410-1

Manufacturer Part Number
lt8410-1
Description
Ultralow Power Boost Converter With Output Disconnect
Manufacturer
Linear Technology Corporation
Datasheet
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APPLICATIONS
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TYPICAL APPLICATION
*HIGHER VALUE CAPACITOR IS REQUIRED
WHEN THE V
FEATURES
V
2.5V to 16V
General Purpose Bias with Wide Input Voltage
IN
Sensor Power
RF Mems Relay Power
General Purpose Bias
Ultralow Quiescent Current
Comparator Built into SHDN pin
Low Noise Control Scheme
Adjustable FB reference voltage
Wide Input Range: 2.5V to 16V
Wide Output Range : Up to 40V
Integrated Power NPN Switch
Integrated Schottky Diode
Integrated Output Disconnect
High Value (12.4M/0.4M) Feedback Resistors
Integrated
Built in Soft-Start (Optional Capacitor from V
GND)
Overvoltage Protection for CAP and V
Tiny 8-Pin 2mm × 2mm DFN package
8.5μA in Active Mode
0μA in Shutdown Mode
25mA Current Limit (LT8410)
8mA Current Limit (LT8410-1)
CHIP
ENABLE
IN
2.2μF
IS HIGHER THAN 5V
100μH
SHDN
V
GND
SW
CC
LT8410
V
CAP
V
FBP
OUT
REF
604K
412K
8410-1 TA01a
0.1μF
V
OUT
0.1μF
= 16V
0.1μF*
OUT
pins
REF
10
8
6
4
2
0
0.01
to
Output Voltage Ripple
vs Load Current
V
IN
= 3.6V
LOAD CURRENT (mA)
0.1
DESCRIPTION
The LT
with integrated power switch, Schottky diode and output
disconnect circuitry. The parts control power delivery by
varying both the peak inductor current and switch off-
time. This control scheme results in low output voltage
ripple as well as high effi ciency over a wide load range.
The quiescent current is a low 8.5μA, which is further
reduced to 0μA in shutdown. The internal disconnect
circuitry allows the output voltage to be blocked from
the input during shutdown. High value (12.4M/0.4M)
resistors are integrated on chip for output voltage detection,
signifi cantly reducing input referred quiescent current.
The LT8410/-1 also features a comparator built into the
SHDN pin, over voltage protection for the CAP and V
pins, built in soft-start and comes in a tiny 8-pin 2mm ×
2mm DFN package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815,
6498466, 6611131.
®
8410/LT8410-1 are ultralow power boost converters
Converter with Output
1
Ultralow Power Boost
8410-1 TA02
10
LT8410/LT8410-1
100
90
80
70
60
50
40
0.01
Effi ciency vs Load Current
Disconnect
0.1
LOAD CURRENT (mA)
V
1
IN
= 3.6V
V
IN
= 12V
V
IN
10
= 5V
8410-1 TA03
84101f
1
OUT
100

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lt8410-1 Summary of contents

Page 1

... Converter with Output DESCRIPTION ® The LT 8410/LT8410-1 are ultralow power boost converters with integrated power switch, Schottky diode and output disconnect circuitry. The parts control power delivery by varying both the peak inductor current and switch off- time. This control scheme results in low output voltage ripple as well as high effi ...

Page 2

... V =3.0V SHDN CONDITIONS (Note 3) Not Switching SHDN V = 16V OUT After Start-Up (Note 4) During Start-Up (Note 4) LT8410 LT8410-1 TOP VIEW SHDN 1 8 FBP REF 9 GND 3 6 CAP ...

Page 3

... Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT8410/LT8410-1 are guaranteed to meet performance specifi cations from 0°C to 125°C junction temperature. Specifi cations over TYPICAL PERFORMANCE CHARACTERISTICS ...

Page 4

... V VOLTAGE (V) CC Quiescent Current in Regulation with No Load 1000 V = 3.6V CC 100 OUTPUT VOLTAGE (V) Peak Inductor Current vs Temperature (LT8410- 3. 16V OUT FIGURE 5 CIRCUIT 120 – TEMPERATURE (°C) Quiescent Current vs Temperature ...

Page 5

... V VOLTAGE ( VOLTAGE OUT 10mV/DIV AC COUPLED SW VOLTAGE 10V/DIV INDUCTOR CURRENT 20mA/DIV 8410-1 G13 8410-1 G15 12 16 8410-1 G17 LT8410/LT8410-1 LT8410 Switching Waveform at 0.5mA Load V = 3.6V 2μs/DIV 8410-1 G14 16V OUT UVLO vs Temperature 2.6 2.4 V RISING CC 2.2 V FALLING CC 2 1.8 1.6 1.4 –40 ...

Page 6

... LT8410/LT8410-1 TYPICAL PERFORMANCE CHARACTERISTICS Output Disconnect PMOS Current vs CAP to V Voltage Difference OUT 16V CAP LT8410 LT8410 CAP TO V VOLTAGE DIFFERENCE (V) OUT LT8410 Start-Up Waveforms With 0.1μF Capacitor at V REF SHDN VOLTAGE 5V/DIV INDUCTOR CURRENT 20mA/DIV CAP VOLTAGE ...

Page 7

... OUT For protection purposes, the output voltage can not exceed 40V even if V SHDN 1 ENABLE CHIP + 1.235V + – – 1.235V FB – 1.235V + LT8410/LT8410-1 ) according FBP / 31.85 is driven higher than V . FBP REF V CAP OUT 5 6 12.4M OUTPUT DISCONNECT 400K CONTROL TIMING AND PEAK SWITCH ...

Page 8

... APPLICATIONS INFORMATION Inductor Selection Several inductors that work well with the LT8410 and LT8410-1 are listed in Table 1. The tables are not complete, and there are many other manufacturers and devices that can be used. Consult each manufacturer for more detailed information and for their entire selection of related parts, as many different sizes and shapes are available. Inductors with a value of 47μ ...

Page 9

... F01 LT8410/LT8410-1 pin. OUT . Loads connected to the CC pins. OUT – • 150 • 25mA and 8mA for LT8410 and LT8410-1 – – • 200 • 10 OUT the desired output voltage. If the inductor RIPPLE I RIPPLE = I – ...

Page 10

... LT8410/LT8410-1 APPLICATIONS INFORMATION Step 4. Calculate the nominal output current: I • V • 0.7 IN(AVG OUT(NOM) V OUT Step 5. Derate output current • 0.8 OUT OUT(NOM) For low output voltages the output current capability will be increased. When using output disconnect (load current taken from V ...

Page 11

... SW pin and always use a ground plane under the switching regulator to minimize interplane coupling. In addition, the FBP pin and V are sensitive to noise. Minimize the length and area of all traces to these two pins is recommended. Recommended component placement is shown in Figure 3. LT8410/LT8410-1 SHDN V IN SHDN V ...

Page 12

... LT8410/LT8410-1 TYPICAL APPLICATIONS 100μH 2.5V to 16V C1 2.2μF SW CAP OUT LT8410 V REF SHDN TURN ON/OFF GND FBP C1: 2.2μF, 16V, X5R, 0603 C2: 0.1μF, 25V, X5R, 0603 C3: 0.1μF, 25V, X5R, 0603 * C4: 0.1μF , 16V, X7R, 0402 L1: MURATA LQH32CN101K53 * HIGHER CAPACITANCE VALUE IS REQUIRED FOR ...

Page 13

... C3: 0.1μF, 100V, X5R, 0603 * C4: 0.1μF, 16V, X7R, 0402 L1: COILCRAFT LPS3314-154ML * HIGHER CAPACITANCE VALUE IS REQUIRED FOR C3 WHEN THE V IS HIGHER THAN 0.1μ 34V OUT C3 0.1μF C4 133K 0.1μF 866K 8410-1 TA09 LT8410/LT8410-1 Effi ciency vs Load Current 12V 3. 0.01 0.1 ...

Page 14

... NA 35 110/887 30 237/768 25 365/634 20 487/511 15 619/383 10 750/255 5 866/127 14 C2 SHDN VOLTAGE 1.0μ 16V OUT C3 V OUT 10000μF C4 INPUT CURRENT 0.1μF 8410-1 TA10a LT8410-1 Maximum Output Current vs Output Voltage MAXIMUM OUTPUT CURRENT ( 0.12 0.16 0.14 0.19 0.18 0.25 0.25 0.35 0.34 0.48 0.48 0.69 0.84 1.2 2.3 3.3 Charging Waveforms 2V/DIV VOLTAGE 10V/DIV 5mA/DIV INDUCTOR ...

Page 15

... ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE LT8410/LT8410-1 TYP 5 8 0.40 0.10 PIN 1 NOTCH ...

Page 16

... LT8410/LT8410-1 TYPICAL APPLICATION High Voltage Power Supply Doesn’t Need a Transformer DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY V IN 2.5V to 16V TURN ON/OFF C1: 2.2μF, 16V, X5R, 0603 C2 – C7: 0.1μF, 100V, X5R, 0603 C8: 0.1μF, 16V, X7R, 0402 D1 – D4: ON SEMI RB751S40T1G ...

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