ltm8027 Linear Technology Corporation, ltm8027 Datasheet

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ltm8027

Manufacturer Part Number
ltm8027
Description
60v, 4a Dc/dc ?module Regulator
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
16V TO 60V
Complete Switch Mode Power Supply
Wide Input Voltage Range: 4.5V to 60V
(7.5V Minimum Voltage to Start)
Wide Output Voltage Range: 2.5V to 24V
(See Table 2)
4A Output Current
Programmable Soft-Start
10μA Shutdown Supply Current
Selectable Switching Frequency Current Mode
Control
Up to 95% Effi ciency
Pb-Free (e4) RoHS Compliant Package with
Gold Pad Finish
Tiny, Low Profi le (15mm × 15mm × 4.32mm)
Surface Mount LGA Package
12V and 42V Automotive and Heavy Equipment
48V Telecom Power Supplies
Avionics and Industrial Control Systems
Distributed Power Converters
V
48W, 16V
IN
4.7μF
IN
2
to 60V
1M
48.7k
IN
DC/DC μModule
V
RUN
SS
SYNC
RT
IN
LTM8027
GND
BIAS1
BIAS2
V
AUX
ADJ
OUT
®
Regulator
56.2k
3845 TA01a
22μF
V
12V
4A
4
OUT
DESCRIPTION
The LTM
supply. Included in the package are the switching control-
ler, power switches, inductor and all support components.
Operating over an input voltage range of 4.5V to 60V (7.5V
minimum voltage to start), the LTM8027 supports output
voltages up to 24V, and a switching frequency range of
100kHz to 500kHz, each set by a single resistor. Only the
bulk input and output fi lter capacitors are needed to fi nish
the design.
The low profi le package (4.32mm) enables utilization of
unused space on the bottom of PC boards for high den-
sity point of load regulation. A built-in soft-start timer is
adjustable with a small capacitor.
The LTM8027 is packaged in a thermally enhanced, compact
(15mm × 15mm) and low profi le (4.32mm) over-molded
land grid array (LGA) package suitable for automated
assembly by standard surface mount equipment. The
LTM8027 is Pb-free and RoHS compliant.
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
60V, 4A DC/DC µModule
®
8027 is a complete 4A, DC/DC step-down power
100
60
90
80
70
50
40
30
20
10
0
0
24V
IN
Effi ciency vs Load
1
LOAD (A)
2
Regulator
3
LTM8027
8027 TA01b
4
1
8027f

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ltm8027 Summary of contents

Page 1

... PC boards for high den- sity point of load regulation. A built-in soft-start timer is adjustable with a small capacitor. The LTM8027 is packaged in a thermally enhanced, compact (15mm × 15mm) and low profi le (4.32mm) over-molded land grid array (LGA) package suitable for automated assembly by standard surface mount equipment ...

Page 2

... LTM8027EV#PBF LTM8027IV#PBF LTM8027IV#PBF LTM8027MPV#PBF LTM8027MPV#PBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: This product is only offered in trays. For more information go to: ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi ...

Page 3

... Specifi cations over the full –40°C to 125°C internal operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTM8027I is guaranteed to meet specifi cations over the full l The denotes the specifi ...

Page 4

... LTM8027 TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Load 2.5V OUT 100 12V IN 24V IN 10 36V LOAD (A) 8027 G01 Effi ciency vs Load OUT 100 12V IN 24V IN 20 36V IN 48V 10 IN 60V ...

Page 5

... Input Current vs Load 24V OUT 3500 36V IN 48V IN 3000 60V IN 2500 2000 1500 1000 500 LOAD (A) LTM8027 (T = 25°C unless otherwise noted) A Input Current vs Load OUT 2000 12V IN 1800 24V IN 36V IN 1600 48V IN 60V 1400 IN 1200 1000 ...

Page 6

... LTM8027 TYPICAL PERFORMANCE CHARACTERISTICS Bias Current vs Load 3.3V OUT 18.0 17.5 17.0 16.5 16.0 15.5 15.0 48V IN 36V IN 14.5 24V IN 12V IN 14 LOAD (A) 8027 G18 Bias Current vs Load 12V OUT 29.5 29.0 28.5 28.0 27.5 27.0 26.5 26.0 48V IN 36V 25.5 IN 24V IN 25 LOAD (A) 8027 G21 Bias Current vs Load 24V OUT 48V IN 36V IN 32 ...

Page 7

... V (V) OUT Minimum V vs Load –8V OUT LOAD (A) LTM8027 (T = 25°C unless otherwise noted) A Minimum V vs Load 18V OUT LOAD (A) 8027 G28 Minimum V vs Load –3.3V ...

Page 8

... LTM8027 TYPICAL PERFORMANCE CHARACTERISTICS Temperature Rise vs Load 2.5V OUT 42 36V IN 24V 37 IN 12V LOAD (A) 8027 G35 Temperature Rise vs Load OUT 70 60V IN 48V IN 60 36V IN 24V IN 50 12V LOAD (A) 8027 G38 ...

Page 9

... If unused, the SYNC pin is connected to GND. For more information see Oscillator Sync in the Application Information section of this data sheet. ADJ (Pin A2): The LTM8027 regulates its ADJ pin to 1.23V. Connect the adjust resistor from this pin to ground. The value given by the equation: ...

Page 10

... LINEAR V IN REGULATOR GND R T The LTM8027 is a fi xed frequency PWM regulator. The switching frequency is set by simply connecting the ap- propriate resistor from the RT pin to GND. A linear regulator provides internal power (shown as INTV on the Block Diagram) to the control circuitry. The CC bias regulator normally draws power from the V if the BIAS1and BIAS2 pins are connected to an external voltage higher than 8 ...

Page 11

... LTM8027. A ceramic input capacitor combined with trace or cable inductance forms a high Q (under damped) tank circuit. If the LTM8027 circuit is plugged into a live supply, the input voltage can ring to twice its nominal value, possi- bly exceeding the device’s rating. This situation is easily avoided ...

Page 12

... LTM8027 APPLICATIONS INFORMATION For example, suppose the LTM8027 needs to provide 5V from an input voltage source that is nominally 12V. From Table 2, the recommended R value is 162k, which cor- T responds to an operating frequency of 210kHz. From the graphs in the Typical Performance Characteristics, the typical INTV current at 12V and 210kHz is 15mA ...

Page 13

... The LTM8027 operational status is primarily controlled by a UVLO circuit on internal power source. When the LTM8027 is enabled via the RUN pin, only the V tor is enabled. Switching remains disabled until the UVLO threshold is achieved at the V pin, when the remainder CC of the LTM8027 is enabled and switching commences ...

Page 14

... The small size, robustness and low impedance of ceramic capacitors make them an attractive option for the input bypass capacitor of LTM8027. However, these capacitors can cause problems if the LTM8027 is plugged into a live supply (see Linear Technology Application Note 88 for a complete discussion). The low loss ceramic capacitor ...

Page 15

... Thermal Considerations IN The LTM8027 output current may need to be derated required to operate in a high ambient temperature or deliver a large amount of continuous power. The amount of current derating is dependent upon the input voltage, output power and ambient temperature ...

Page 16

... LTM8027. The bulk of the heat fl ow out of the LTM8027 is through the bottom of the module and the LGA pads into the printed circuit board. Consequently a poor printed circuit board design can cause excessive heating, result- ing in impaired performance or reliability ...

Page 17

... OUT 4.7μF 1M LTM8027 2 RUN BIAS1 SS BIAS2 AUX SYNC RT ADJ GND 48.7k LTM8027 5V V Step-Down Converter OUT OUT 4.7μF 1M LTM8027 2 9V RUN BIAS1 SS BIAS2 AUX SYNC RT ADJ GND 75k 162k 18V V Step-Down Converter OUT OUT 4.7μF 1M LTM8027 2 RUN BIAS1 9V SS ...

Page 18

... LTM8027 PACKAGE DESCRIPTION bbb // 6.350 5.080 3.810 2.540 1.270 0.000 1.270 2.540 3.810 5.080 6.350 8027f ...

Page 19

... G6 GND L3 G7 GND L5 G8 GND OUT G10 V L8 OUT G11 V L9 OUT H1 V L10 L11 LTM8027 GND GND GND GND V OUT V OUT V OUT GND GND GND GND V OUT V OUT V OUT ...

Page 20

... LTM8027 PACKAGE PHOTOGRAPH RELATED PARTS PART NUMBER DESCRIPTION LTM4600 10A DC/DC μModule Regulator LTM4600HVMPV Military Plastic 10A DC/DC μModule Regulator LTM4601/ 12A DC/DC μModule with PLL, Output Tracking/ LTM4601A Margining and Remote Sensing LTM4602 6A DC/DC μModule Regulator LTM4603 6A DC/DC μModule with PLL and Output Tracking/ Margining and Remote Sensing ...

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