LT1913IDD#PBF Linear Technology, LT1913IDD#PBF Datasheet

IC REG STP DWN 3.5A 10-DFN

LT1913IDD#PBF

Manufacturer Part Number
LT1913IDD#PBF
Description
IC REG STP DWN 3.5A 10-DFN
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LT1913IDD#PBF

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
0.79 ~ 25 V
Current - Output
3.5A
Frequency - Switching
200kHz ~ 2.4MHz
Voltage - Input
3.6 ~ 25 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
10-DFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LT1913IDD#PBFLT1913IDD
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LT1913IDD#PBFLT1913IDD
Manufacturer:
LINEAR/凌特
Quantity:
20 000
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
6.5V TO 25V
Wide Input Range: 3.6V to 25V
3.5A Maximum Output Current
Adjustable Switching Frequency: 200kHz to 2.4MHz
Low Shutdown Current: I
Integrated Boost Diode
Synchronizable Between 250kHz to 2MHz
Power Good Flag
Saturating Switch Design: 95m On-Resistance
0.790V Feedback Reference Voltage
Output Voltage: 0.79V to 25V
Thermal Protection
Soft-Start Capability
Small 10-Pin (3mm × 3mm) DFN Packages
Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
10μF
V
IN
680pF
63.4k
OFF ON
U
15k
5V Step-Down Converter
Q
RUN/SS
V
RT
PG
SYNC
C
< 1μA
V
IN
U
LT1913
GND
BD
BOOST
SW
FB
Step-Down Switching Regulator
0.47μF
100k
536k
4.7μH
1913 TA01a
DESCRIPTIO
The LT
2.4MHz) monolithic buck switching regulator that accepts
input voltages up to 25V. A high effi ciency 95m switch
is included on the die along with a boost Schottky diode
and the necessary oscillator, control, and logic circuitry.
Current mode topology is used for fast transient response
and good loop stability. Shutdown reduces input supply
current to less than 1μA while a resistor and capacitor on
the RUN/SS pin provide a controlled output voltage ramp
(soft-start). A power good fl ag signals when V
91% of the programmed output voltage. The LT1913 is
available in 10-Pin 3mm × 3mm DFN packages with ex-
posed pads for low thermal resistance.
All other trademarks are the property of their respective owners.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
47μF
V
5V
3.5A
OUT
®
1913 is an adjustable frequency (200kHz to
25V, 3.5A, 2.4MHz
U
100
90
80
70
60
50
0
V
L = 4.7μH
f = 600kHz
OUT
0.5
= 5V
OUTPUT CURRENT (A)
1
V
Effi ciency
IN
1.5
= 24V
V
IN
= 12V
2
LT1913
2.5
OUT
reaches
3
1913 G01
1
3.5
1913f

Related parts for LT1913IDD#PBF

LT1913IDD#PBF Summary of contents

Page 1

... A power good fl ag signals when V 91% of the programmed output voltage. The LT1913 is available in 10-Pin 3mm × 3mm DFN packages with ex- posed pads for low thermal resistance. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. V OUT 5V 3 ...

Page 2

... LEAD FREE FINISH TAPE AND REEL LT1913EDD#PBF LT1913EDD#TRPBF LT1913IDD#PBF LT1913IDD#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. Consult LTC Marketing for information on non-standard lead based fi nish parts. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T noted. (Note 2) PARAMETER Feedback Voltage FB Pin Bias Current (Note 3) FB Voltage Line Regulation Error Amp g m Error Amp Gain V Source Current C V Sink Current ...

Page 4

LT1913 W U TYPICAL PERFOR A CE CHARACTERISTICS Effi ciency 100 V = 12V 24V OUT L = 4.7μ 600kHz 50 0 0.5 1 1.5 2 2.5 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Feedback Voltage 840 820 800 780 760 –50 – 100 125 TEMPERATURE (°C) 1913 G12 Minimum Switch On-Time 140 120 100 –50 –25 0 ...

Page 6

LT1913 W U TYPICAL PERFOR A CE CHARACTERISTICS Minimum Input Voltage 6.5 6.0 5.5 5 OUT 4 ° 4.7μ 600kHz 4 100 1000 10000 LOAD CURRENT (mA) ...

Page 7

CTIO S BD (Pin 1): This pin connects to the anode of the boost Schottky diode. BD also supplies current to the internal regulator. BOOST (Pin 2): This pin is used to provide a drive ...

Page 8

LT1913 BLOCK DIAGRAM INTERNAL 0.79V REF RUN/ SYNC 6 SOFT-START PG 7 ERROR AMP + 0.7V – GND – + ∑ SLOPE COMP ...

Page 9

OPERATION The LT1913 is a constant frequency, current mode step- down regulator. An oscillator, with frequency set by RT, enables an RS fl ip-fl op, turning on the internal power switch. An amplifi er and comparator monitor the current fl ...

Page 10

LT1913 APPLICATIONS INFORMATION FB Resistor Network The output voltage is programmed with a resistor divider between the output and the FB pin. Choose the 1% resis- tors according to: V OUT R1= R2 – 1 0.79V Reference designators refer to ...

Page 11

APPLICATIONS INFORMATION operating input voltage. Conversely, a lower switching frequency will be necessary to achieve safe operation at high input voltages. If the output is in regulation and no short-circuit, start- up, or overload events are expected, then input voltage ...

Page 12

... For details of maximum output current and discontinuous mode opera- tion, see Linear Technology Application Note 44. Finally, for duty cycles greater than 50 minimum inductance required to avoid subharmonic oscillations. See AN19. ...

Page 13

APPLICATIONS INFORMATION Table 2. Capacitor Vendors VENDOR PHONE Panasonic (714) 373-7366 Kemet (864) 963-6300 Sanyo (408) 749-9714 Murata (408) 436-1300 AVX Taiyo Yuden (864) 963-6300 rating, may be required. High performance tantalum or electrolytic capacitors can be used for the ...

Page 14

LT1913 APPLICATIONS INFORMATION V pin, as shown in Figure 2. Generally a capacitor (C C and a resistor ( series to ground are used. In addi- C tion, there may be lower value capacitor in parallel. This capacitor ...

Page 15

APPLICATIONS INFORMATION BD BOOST LT1913 IN SW GND 4.7μF (4a) For V > 2.8V OUT BD BOOST V V LT1913 GND 4.7μF (4b) For 2.5V < V OUT BD BOOST LT1913 ...

Page 16

LT1913 APPLICATIONS INFORMATION charged with the energy stored in the inductor, the circuit will rely on some minimum load current to get the boost circuit running properly. This minimum load will depend on input and output voltages, and on the ...

Page 17

... LT1913 circuits. However, these capaci- tors can cause problems if the LT1913 is plugged into a live supply (see Linear Technology Application Note 88 for a complete discussion). The low loss ceramic capacitor, combined with stray inductance in series with the power ...

Page 18

LT1913 APPLICATIONS INFORMATION to prevent this overshoot. Figure 9 shows the waveforms that result when an LT1913 circuit is connected to a 24V supply through six feet of 24-gauge twisted pair. The fi rst plot is the response with a ...

Page 19

... IN 6.5V TO 25V 10μ SEMI MBRA340 L: NEC MPLC0730L4R7 Other Linear Technology Publications Application Notes 19, 35 and 44 contain more detailed descriptions and design information for buck regulators and other switching regulators. The LT1376 data sheet has a more extensive discussion of output ripple, loop compensation and stability testing. Design Note 100 shows how to generate a bipolar output supply using a buck regulator ...

Page 20

LT1913 TYPICAL APPLICATIONS V IN 4.8V TO 25V 4.7μF 680pF D: ON SEMI MBRA340 L: NEC MPLC0730L3R3 25V 4.7μF 680pF D1: ON SEMI MBRA340 D2: MBR0540 L: NEC MPLC0730L3R3 20 3.3V Step-Down Converter ...

Page 21

TYPICAL APPLICATIONS V IN 8.6V TO 22V 4.7μF 15k 680pF D: ON SEMI MBRA340 L: NEC MPLC0730L2R2 V IN 15V TO 25V 10μF 680pF D: ON SEMI MBRA340 L: NEC MBP107558R2P 5V, 2MHz Step-Down Converter OFF ...

Page 22

LT1913 TYPICAL APPLICATIONS V IN 3.6V TO 25V 4.7μF 680pF D: ON SEMI MBRA340 L: NEC MPLC0730L3R3 22 1.8V Step-Down Converter RUN/SS BOOST ON OFF LT1913 RT 16.9k PG SYNC FB 78.7k GND f ...

Page 23

PACKAGE DESCRIPTION 3.50 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 0.25 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK (SEE NOTE 6) DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699) 0.675 ...

Page 24

... OUT(MIN 0.8V 1.9mA, I < 1μA, OUT(MIN 0.78V 2mA 2μA, OUT(MIN 0.8V 4.6mA 1μA, OUT(MIN 0.79V 75μA, I < 1μA, OUT(MIN 1.26V 850μA, I < 1μA, OUT(MIN 0.78V 70μA, I < 1μA, OUT(MIN 1207 • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2007 1913f ...

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