LM5155DSS

Texas InstrumentsExtended

-40℃~+125℃@(TJ) 1 1.5A 2.2MHz 3.5V~45V Boost Boost、SEPIC、Flyback External No WSON-12-EP(2x3) DC-DC Converters ROHS

Part id: ti/LM5155DSS
Category: DC DC Controllers
Package: WSON-12-EP(2x3)
Pins: 13
In stock: 5,687 at JLCPCB (C545416)
Used on: 3 open-source boards

Overview

The LM5155DSS is a DC DC Controller made by Texas Instruments in a WSON-12-EP(2x3) package with 13 pins. -40℃~+125℃@(TJ) 1 1.5A 2.2MHz 3.5V~45V Boost Boost、SEPIC、Flyback External No WSON-12-EP(2x3) DC-DC Converters ROHS.

PCBKit's library has its KiCad symbol (EasyEDA_Cloud:LM51551DSSR, from EasyEDA) and its footprint (EasyEDA_Cloud:WSON-12_L3.0-W2.0-P0.5-BL-EP2.7, from EasyEDA), ready for a KiCad board. 5,687 are in stock at JLCPCB (part C545416). 3 open-source boards in 2 repositories on GitHub use it.

Symbol

EasyEDA_Cloud:LM51551DSSRFrom EasyEDA

Footprint

EasyEDA_Cloud:WSON-12_L3.0-W2.0-P0.5-BL-EP2.7From EasyEDA

From the datasheet

Supply, least: 3.5 V · BIAS, recommended operating min, internal VCC regulator · p. 14
Supply, most: 45 V · BIAS, recommended operating max, internal VCC regulator · p. 14
Supply, least: 2.97 V · BIAS, recommended operating min, BIAS connected to VCC · p. 14
Supply, most: 16 V · BIAS, recommended operating max, BIAS connected to VCC · p. 14
Supply, absolute maximum: 50 V · BIAS, absolute max to AGND · p. 5
Junction, hottest: 150 °C · Junction temperature, absolute max · p. 5
Takes working: 480 µA · BIAS operating current typical, 12 V, VUVLO = 2 V, VFB = VREF, RT = 220 kΩ · p. 6
Takes at most: 540 µA · BIAS operating current max, 12 V, VUVLO = 2 V, VFB = VREF, RT = 220 kΩ · p. 6
Takes asleep: 2.6 µA · BIAS shutdown current typical, VBIAS = 12 V, VUVLO = 0 V · p. 6
Feedback reference: 1 V · FB reference typical · p. 7
Switches at: 100 kHz · Switching frequency typical, RT = 220 kΩ · p. 7
Switches at: 2.2 MHz · Switching frequency typical, RT = 9.09 kΩ · p. 7
Junction to air (DSS(WSON)): 40.8 K/W · Junction-to-ambient, LM5155EVM-BST · p. 6
Junction to air (DSS(WSON)): 63.7 K/W · Junction-to-ambient thermal resistance · p. 6
Junction to case (DSS(WSON)): 61 K/W · Junction-to-case top thermal resistance · p. 6
Junction to board (DSS(WSON)): 32.1 K/W · Junction-to-board thermal resistance · p. 6

What it is and has

Control: Peak-current-mode control; boost, SEPIC, and flyback topologies · p. 11
Package: 12-pin WSON, 3 mm × 2 mm · p. 1
Hiccup mode protection: Disabled · p. 3
Protection: Cycle-by-cycle current limit, overvoltage protection, line UVLO, thermal shutdown · p. 11
Additional functions: Low shutdown IQ, programmable soft start, programmable slope compensation · p. 3
Monitoring and synchronization: Precision reference, power-good indicator, external clock synchronization · p. 3

Around it

cap 1 µF to 4.7 µF: between VCC and PGND; Ceramic bypass capacitor for the internal VCC regulator and MOSFET driver supply. · p. 14

Specifications

Parameter	Conditions	As printed	Page
BIAS to AGND		min -0.3 · max 50 V	5
UVLO to AGND	Maximum VBIAS+0.3 V	min -0.3 V	5
SS to AGND	This pin is not specified to have an external voltage applied.	min -0.3 · max 3.8 V	5
RT to AGND	This pin is not specified to have an external voltage applied.	min -0.3 · max 3.8 V	5
FB to AGND		min -0.3 · max 3.8 V	5
CS to AGND(DC)	DC	min -0.3 · max 0.3 V	5
CS to AGND(100ns transient)	100ns transient	min -1 V	5
CS to AGND(20ns transient)	20ns transient	min -2 V	5
PGND to AGND		min -0.3 · max 0.3 V	5
VCC to AGND	Maximum is 18 V or VBIAS + 0.3 V, whichever is lower.	min -0.3 · max 18 V	5
GATE to AGND (100ns transient)	100ns transient	min -1 V	5
GATE to AGND (50ns transient)	50ns transient	min -2 V	5
PGOOD to AGND	Maximum sink current limited to 1 mA when VPGOOD>VBIAS.	min -0.3 · max 18 V	5
COMP to AGND	Internal maximum voltage clamp can handle up to 1.6 mA.	min -0.3 V	5
Junction temperature TJ		min -40 · max 150 °C	5
Storage temperature Tstg		min -55 · max 150 °C	5
Electrostatic discharge V(ESD)	Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins; ±2000 V	max 2000 V	5
Electrostatic discharge V(ESD)	Charged device model (CDM), per JEDEC specification JESD22-C101, all pins; ±500 V	max 500 V	5
Bias input VBIAS	2.97–16 V with VCC directly connected to BIAS; 3.5–45 V with internal VCC regulator.	min 2.97 · max 45 V	6
VCC voltage VVCC	Less than VBIAS + 0.3 V	min 2.97 · max 16 V	6
UVLO input VUVLO		min 0 · max 45 V	6
FB input VFB		min 0 · max 3.7 V	6
Typical switching frequency fSW		min 100 · max 2200 kHz	6
Synchronization pulse frequency fSYNC		min 100 · max 2200 kHz	6
Operating junction temperature TJ		min -40 · max 125 °C	6
Junction-to-ambient thermal resistance (LM5155EVM-BST) RθJA	DSS(WSON), 12 pins	typ 40.8 °C/W	6
Junction-to-ambient thermal resistance RθJA	DSS(WSON), 12 pins	typ 63.7 °C/W	6
Junction-to-case (top) thermal resistance RθJC(top)	DSS(WSON), 12 pins	typ 61 °C/W	6
Junction-to-board thermal resistance RθJB	DSS(WSON), 12 pins	typ 32.1 °C/W	6
Junction-to-top characterization parameter (LM5155EVM-BST) ψJT	DSS(WSON), 12 pins	typ 1.5 °C/W	6
Junction-to-top characterization parameter ψJT	DSS(WSON), 12 pins	typ 2.3 °C/W	6
Junction-to-board characterization parameter (LM5155EVM-BST) ψJB	DSS(WSON), 12 pins	typ 22.5 °C/W	6
Junction-to-board characterization parameter ψJB	DSS(WSON), 12 pins	typ 31.9 °C/W	6
Junction-to-case (bottom) thermal resistance RθJC(bot)	DSS(WSON), 12 pins	typ 11.2 °C/W	6
BIAS shutdown current ISHUTDOWN(BIAS)	VBIAS = 12 V, VUVLO = 0 V	typ 2.6 · max 5 uA	6
BIAS operating current IOPERATING(BIAS)	VBIAS = 12 V, VUVLO = 2 V, VFB = VREF, RT = 220 kΩ	typ 480 · max 540 uA	6
VCC regulation VVCC-REG	VBIAS = 8 V, No load	min 6.5 · typ 6.85 · max 7 V	6
VCC regulation	VBIAS = 8 V, IVCC = 35 mA	min 6.5 V	6
VCC UVLO threshold VVCC-UVLO(RISING)	VCC rising	min 2.75 · typ 2.85 · max 2.95 V	6
VCC UVLO hysteresis	VCC falling	typ 0.063 V	6
VCC sourcing current limit IVCC-CL	VBIAS = 10 V, VVCC = 0 V	min 35 · typ 105 mA	6
Enable threshold VEN(RISING)	EN rising	min 0.4 · typ 0.52 · max 0.7 V	6
Enable threshold VEN(FALLING)	EN falling	min 0.33 · typ 0.49 · max 0.63 V	6
Enable hysteresis VEN(HYS)	EN falling	typ 0.03 V	7
UVLO / SYNC threshold VUVLO(RISING)	UVLO rising	min 1.425 · typ 1.5 · max 1.575 V	7
UVLO / SYNC threshold VUVLO(FALLING)	UVLO falling	min 1.37 · typ 1.45 · max 1.52 V	7
UVLO / SYNC threshold hysteresis VUVLO(HYS)	UVLO falling	typ 0.05 V	7
UVLO hysteresis current IUVLO	VUVLO = 1.6 V	min 4 · typ 5 · max 6 uA	7
Soft-start current ISS		min 9 · typ 10 · max 11 uA	7
SS pull-down switch RDSON		typ 55 Ω	7
Switching frequency fsw1	RT = 220 kΩ	min 85 · typ 100 · max 115 kHz	7
Switching frequency fsw2	RT = 9.09 kΩ	min 1980 · typ 2200 · max 2420 kHz	7
Minimum on-time tON(MIN)	RT = 9.09 kΩ	typ 50 ns	7
Maximum duty cycle limit DMAX1	RT = 9.09 kΩ	min 80 · typ 85 · max 90 %	7
Maximum duty cycle limit DMAX2	RT = 220 kΩ	min 90 · typ 93 · max 96 %	7
Peak slope compensation current ISLOPE	RT = 220 kΩ	min 22.5 · typ 30 · max 37.5 uA	7
Current Limit threshold (CS-PGND) VCLTH		min 93 · typ 100 · max 107 mV	7
FB reference VREF	LM5155	min 0.99 · typ 1 · max 1.01 V	7
Transconductance Gm		typ 2 mA/V	7
COMP sourcing current	VCOMP = 1.2 V	min 180 uA	7
COMP clamp voltage	COMP rising (VUVLO = 2.0V)	min 2.5 · typ 2.8 V	7
COMP clamp voltage	COMP falling	typ 1 · max 1.1 V	7
Over-voltage threshold VOVTH	FB rising (referece to VREF)	min 107 · typ 110 · max 113 %	7
Over-voltage threshold	FB falling (referece to VREF)	typ 105 %	7
PGOOD pull-down switch RDSON	1 mA sinking	typ 90 Ω	7
Undervoltage threshold VUVTH	FB falling (referece to VREF)	min 87 · typ 90 · max 93 %	7
Undervoltage threshold	FB rising (referece to VREF)	typ 95 %	7
High-state voltage drop	100 mA sinking	typ 0.25 V	7
Low-state voltage drop	100 mA sourcing	typ 0.15 V	7
Thermal shutdown threshold TTSD	Temperature rising	typ 175 °C	7
Thermal shutdown hysteresis		typ 15 °C	7

Pins, by the datasheet

1 BIAS: Supply input to the VCC regulator; connect a bypass capacitor to PGND. · p. 4
2 VCC: Internal VCC regulator output and MOSFET driver supply input; connect a ceramic bypass capacitor to PGND. · p. 4
3 GATE: N-channel MOSFET gate drive output; connect to the gate through a short, low inductance path. · p. 4
4 PGND: Power ground; connect directly to the sense resistor ground through a wide, short, low inductance path. · p. 4
5 CS: Current sense input; connect to the positive side of the sense resistor through a short path. · p. 4
6 COMP: Transconductance error amplifier output; connect loop compensation components between COMP and PGND. · p. 4
7 AGND: Analog ground; connect to the analog ground plane through a wide, short path. · p. 4
8 FB: Inverting error amplifier input; connect an output voltage divider for boost/SEPIC and return its low-side resistor to AGND. · p. 4
9 SS: Soft-start programming input; connect a capacitor to AGND to set the reference ramp rate. · p. 4
10 RT: Switching frequency setting input; connect a resistor between RT and AGND. · p. 4
11 PGOOD: Power-good output goes low when FB is below the undervoltage threshold; connect a pullup resistor to the system voltage rail. · p. 4
— EP: Exposed pad must connect to AGND and a large ground copper plane to decrease thermal resistance. · p. 4

Parameters

Current - Supply: 480uA
Current - Supply(Max): 540uA
Features: Hiccup current limiting
Frequency - Switching: 2.2MHz
Function: Boost
Junction Temperature(Max): 150℃
Number of Outputs: 1
Operating Temperature: -40℃~+125℃@(TJ)
Output Current: 1.5A
Output Type: Adjustable
Quiescent Current: 480uA
Reference Voltage: 1V
Standby Current: 2.6uA
Switch tube (built-in/external): External
Synchronous Rectifier: No
Thermal Resistance(Junction to Ambient): 63.7℃/W
Thermal Resistance(Junction to Board): 32.1℃/W
Thermal Resistance(Junction to Case): 61℃/W
Topology: Boost
Voltage - Supply: 2.97V~45V
Voltage - Supply(Absolute Max): 50V

Order codes

LM5155DSSTLCSC C2658384
LM5155DSSRLCSC C545416

Pinout

The pins of the LM5155DSS
Pin	Name	Type
1	BIAS	Unspecified
2	VCC	Unspecified
3	GATE	Unspecified
4	PGND	Unspecified
5	CS	Unspecified
6	COMP	Unspecified
7	AGND	Unspecified
8	FB	Unspecified
9	SS	Unspecified
10	RT	Unspecified
11	PGOOD	Unspecified
12	UVLO/SYNC	Unspecified
13	EP	Unspecified

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Parts like it

Questions

Is there a KiCad symbol and footprint for the LM5155DSS?

Yes. The symbol is EasyEDA_Cloud:LM51551DSSR and the footprint EasyEDA_Cloud:WSON-12_L3.0-W2.0-P0.5-BL-EP2.7, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the LM5155DSS?

WSON-12-EP(2x3), with 13 pins. Its footprint is drawn on this page.

Where is the LM5155DSS datasheet?

Texas Instruments publishes it: the Datasheet link on this page opens it.

Where can I order the LM5155DSS?

JLCPCB lists it as part C545416, with 5,687 in stock; the sellers' links on this page open their listings.

What can replace the LM5155DSS?

Parts like it in the library: the LM5155QDSSRQ1 by Texas Instruments, the LM51551DSST by Texas Instruments and the LM5155QDSSTQ1 by Texas Instruments. Check their datasheets: a part that fits the footprint may still differ in its ratings.

Which open-source boards use the LM5155DSS?

3 boards in 2 repositories on GitHub; the most starred are listed on this page, with their KiCad files.