L5988DTR datasheet, PDF - EEWORLD Datasheet

L5988DTR: DescriptionConv DC-DC 2.9V to 18V Synchronous Step Down Single-Out 0.6V 4A 16-Pin HTSSOP EP T/R; File Size2MB，52 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/; Environmental Compliance

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L5988DTR Overview

Conv DC-DC 2.9V to 18V Synchronous Step Down Single-Out 0.6V 4A 16-Pin HTSSOP EP T/R

L5988DTR Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
Type	Synchronous Step Down
Output Type	Adjustable
Switching Frequency (kHz)	400 to 1000
Switching Regulator	Yes
Number of Outputs	1
Output Voltage (V)	0.6(Min)
Maximum Output Current (A)	4
Minimum Input Voltage (V)	2.9
Maximum Input Voltage (V)	18
Operating Supply Voltage (V)	2.9 to 18
Typical Quiescent Current (uA)	3000(Max)
Line Regulation	6mV(Typ)
Load Regulation	7.5mV(Typ)
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	150
Packaging	Tape and Reel
Pin Count	16
Standard Package Name	SOP
Supplier Package	HTSSOP EP
Mounting	Surface Mount
Package Height	1
Package Length	5
Package Width	4.4
PCB changed	16
Lead Shape	Gull-wing

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L5988D

4 A continuous (more than 5 A pulsed) step-down switching

regulator with synchronous rectification

Datasheet

production data



programmable up to 1 MHz



Voltage feed forward



Zero load current operation



Programmable current limit on both switches



Programmable sink current capability



Pre-bias start up capability

HTSSOP16



Thermal shutdown

Applications

Features



4 A output current (more than 5 pulsed)



Operating input voltage from 2.9 V to 18 V



External 1.8 V ± 2% reference voltage



Output voltage from 0.6 to input voltage



MLCC compatible



200 ns T



Programmable UVLO matches 3.3 V, 5 V and

12 V bus

Figure 1. Test application circuit



Consumer: STB, DVD, LCD TV, VCR, car

radio, LCD monitors



Networking: XDSL, modems, routers and

switches



Computer and peripherals: printers, audio /

graphic cards, optical storage, hard disk drive



Industrial: DC-DC modules, factory automation



HC LED driving

April 2015

This is information on a product in full production.

DocID15324 Rev 4

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www.st.com

Contents

L5988D

Contents

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Pin function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.1

5.2

5.3

5.4

5.5

Multifunction pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Oscillator and synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

External voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Monitoring and protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.5.1

5.5.2

5.5.3

5.5.4

Overvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Current limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.6

5.7

Minimum on time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Error amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.1

6.2

6.3

6.4

Input capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

6.4.1

6.4.2

Type III compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Type II compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

6.5

6.6

6.7

6.8

R.M.S. current of the embedded power MOSFETs . . . . . . . . . . . . . . . . . 36

Thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

2/52

DocID15324 Rev 4

List of tables

L5988D

List of tables

Table 1.

Table 2.

Table 3.

Table 4.

Table 5.

Table 6.

Table 7.

Table 8.

Table 9.

Table 10.

Table 11.

Table 12.

Table 13.

Table 14.

Table 15.

Table 16.

Table 17.

Table 18.

Pinout description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

ESD protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Electrical characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

A/D voltage windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

UOS voltage biasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

FSW resistor examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

ILIM-ADJ resistor examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Uncompensated error amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Input capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Inductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Output capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Component list application circuit (f

= 400 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Component list application circuit (f

= 600 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

HTSSOP16 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

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L5988DTR Related Products

	L5988DTR	L5988D
Description	Conv DC-DC 2.9V to 18V Synchronous Step Down Single-Out 0.6V 4A 16-Pin HTSSOP EP T/R	Conv DC-DC 2.9V to 18V Synchronous Step Down Single-Out 0.6V 4A 16-Pin HTSSOP EP Tube
EU restricts the use of certain hazardous substances	Compliant	Compliant
ECCN (US)	EAR99	EAR99
Part Status	Active	Active
HTS	8542.39.00.01	8542.39.00.01
Type	Synchronous Step Down	Synchronous Step Down
Output Type	Adjustable	Adjustable
Switching Frequency (kHz)	400 to 1000	400 to 1000
Switching Regulator	Yes	Yes
Number of Outputs	1	1
Output Voltage (V)	0.6(Min)	0.6(Min)
Maximum Output Current (A)	4	4
Minimum Input Voltage (V)	2.9	2.9
Maximum Input Voltage (V)	18	18
Operating Supply Voltage (V)	2.9 to 18	2.9 to 18
Typical Quiescent Current (uA)	3000(Max)	3000(Max)
Line Regulation	6mV(Typ)	6mV(Typ)
Load Regulation	7.5mV(Typ)	7.5mV(Typ)
Minimum Operating Temperature (°C)	-40	-40
Maximum Operating Temperature (°C)	150	150
Packaging	Tape and Reel	Tube
Pin Count	16	16
Standard Package Name	SOP	SOP
Supplier Package	HTSSOP EP	HTSSOP EP
Mounting	Surface Mount	Surface Mount
Package Height	1	1
Package Length	5	5
Package Width	4.4	4.4
PCB changed	16	16
Lead Shape	Gull-wing	Gull-wing

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