SLVSA18A September   2009  – July 2015 TPS61161-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Soft Start-Up
      2. 7.3.2 Open LED Protection
      3. 7.3.3 Shutdown
      4. 7.3.4 Undervoltage Lockout
      5. 7.3.5 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 LED Brightness Dimming Mode Selection
      2. 7.4.2 PWM Brightness Dimming
      3. 7.4.3 Digital 1 Wire Brightness Dimming
      4. 7.4.4 EasyScale: 1-Wire Digital Dimming
  8. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Current Program
        2. 8.2.2.2 Maximum Output Current
        3. 8.2.2.3 Inductor Selection
        4. 8.2.2.4 Schottky Diode Selection
        5. 8.2.2.5 Compensation Capacitor Selection
        6. 8.2.2.6 Input and Output Capacitor Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)
MIN MAX UNIT
VI Supply voltage on VIN (2) –0.3 20 V
Voltage on CTRL(2) –0.3 20 V
Voltage on FB and COMP(2) –0.3 3 V
Voltage on SW(2) –0.3 40 V
TJ Operating junction temperature range –40 150 °C
Tstg Storage temperature –65 150 °C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to network ground terminal.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per AEC Q100-002(1) ±1000 V
Charged-device model (CDM), per AEC Q100-011 ±1000
(1) AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.

6.3 Recommended Operating Conditions

MIN NOM MAX UNIT
VI Input voltage range, VIN 2.7 18 V
VO Output voltage range VIN 38 V
L Inductor(1) 10 22 µH
fdim PWM dimming frequency 5 100 kHz
Duty PWM duty cycle resolution At 10 kHz 0.5%
At 30 kHz 1.5%
CIN Input capacitor 1 µF
CO Output capacitor(1) 0.47 10 µF
TA Operating ambient temperature –40 125 °C
(1) These values are recommended values that have been successfully tested in several applications. Other values may be acceptable in other applications but should be fully tested by the user.

6.4 Thermal Information

THERMAL METRIC(1) TPS61161-Q1 UNIT
DRV (SON)
6 PINS
RθJA Junction-to-ambient thermal resistance 96.1 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 89 °C/W
RθJB Junction-to-board thermal resistance 65.9 °C/W
ψJT Junction-to-top characterization parameter 3.2 °C/W
ψJB Junction-to-board characterization parameter 66.3 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 40.8 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

VIN = 3.6 V, CTRL = VIN, TA = –40°C to 125°C, typical values are at TA = 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
VI Input voltage range, VIN 2.7 18 V
IQ Operating quiescent current into VIN Device PWM switching no load 1.8 mA
ISD Shutdown current CRTL = GND, VIN = 4.2 V 1 µA
UVLO Undervoltage lockout threshold VIN falling 2.2 2.5 V
Vhys Undervoltage lockout hysteresis 70 mV
ENABLE AND REFERENCE CONTROL
V(CTRLh) CTRL logic high voltage VIN = 2.7 V to 18 V 1.2 V
V(CTRLl) CTRL logic low voltage VIN = 2.7 V to 18 V 0.4 V
R(CTRL) CTRL pulldown resistor 400 800 1600 kΩ
toff CTRL pulse width to shutdown CTRL high to low 2.5 ms
tes_det EasyScale detection time(1) CTRL pin low 260 µs
tes_delay EasyScale detection delay 100 µs
tes_win EasyScale detection window time Measured from CTRL high 1 ms
VOLTAGE AND CURRENT CONTROL
VREF Voltage feedback regulation voltage 196 200 204 mV
V(REF_PWM) Voltage feedback regulation voltage under brightness control VFB = 50 mV 47 50 53 mV
VFB = 20 mV 17 20 23
IFB Voltage feedback input bias current VFB = 200 mV 2 µA
fS Oscillator frequency 500 600 700 kHz
Dmax Maximum duty cycle VFB = 100 mV 90% 93%
tmin_on Minimum on pulse width 40 ns
Isink Comp pin sink current 100 µA
Isource Comp pin source current 100 µA
Gea Error amplifier transconductance 240 320 400 µmho
Rea Error amplifier output resistance 6 MΩ
fea Error amplifier crossover frequency 5 pF connected to COMP 500 kHz
POWER SWITCH
RDS(on) N-channel MOSFET on-resistance VIN = 3.6 V 0.3 0.6 Ω
VIN = 3 V 0.7
ILN_NFET N-channel leakage current VSW = 35 V, TA = 25°C 1 µA
OC and OLP
ILIM N-Channel MOSFET current limit D = Dmax 0.56 0.7 0.84 A
ILIM_Start Start-up current limit D = Dmax 0.4 A
tHalf_LIM Time step for half current limit 5 ms
Vovp Open LED protection threshold 37 38 39 V
V(FB_OVP) Open LED protection threshold on FB Measured on the FB pin, percentage of Vref, Vref = 200 mV and 20 mV 50%
tREF VREF filter time constant 180 µs
tstep VREF ramp up time 213 µs
EasyScale TIMING
tstart Start time of program stream 2 µs
tEOS End time of program stream 2 360 µs
tH_LB High time low bit Logic 0 2 180 µs
tL_LB Low time low bit Logic 0 2 × tH_LB 360 µs
tH_HB High time high bit Logic 1 2 × tL_HB 360 µs
tL_HB Low time high bit Logic 1 2 180 µs
VACKNL Acknowledge output voltage low Open drain, Rpullup =15 kΩ to VIN 0.4 V
tvalACKN Acknowledge valid time See (2) 2 µs
tACKN Duration of acknowledge condition See (2) 512 µs
THERMAL SHUTDOWN
Tshutdown Thermal shutdown threshold 160 °C
Thysteresis Thermal shutdown threshold hysteresis 15 °C
(1) To select EasyScale mode, the CTRL pin must be low for more than tes_det during tes_win
(2) Acknowledge condition active 0, this condition will only be applied in case the RFA bit is set. Open-drain output, line needs to be pulled high by the host with resistor load.

6.6 Typical Characteristics

Table 1. Table of Graphs

FIGURE
Efficiency TPS61161-Q1 VIN = 3.6 V; 4, 6, 8, 10 LEDs; L = 22 µH Figure 1
Efficiency TPS61161-Q1 Figure 2
Current limit TA = 25°C Figure 3
Current limit Figure 4
EasyScale step Figure 5
PWM dimming linearity VIN = 3.6 V; PWM Freq = 10 kHz and 40 kHz Figure 5
Output ripple at PWM dimming 8 LEDs; VIN = 3.6 V; ILOAD = 20 mA; PWM Freq = 10 kHz Figure 7
Switching waveform 8 LEDs; VIN = 3.6 V; ILOAD = 20 mA; L = 22 µH Figure 8
Start-up 8 LEDs; VIN = 3.6 V; ILOAD = 20 mA; L =22 µH Figure 9
Open LED protection 8 LEDs; VIN = 3.6 V; ILOAD = 20 mA; L = 22 µH Figure 10
TPS61161-Q1 eff_io_lvs791.gif
Figure 1. Efficiency vs Output Current
TPS61161-Q1 scl_dc_lvs791.gif
Figure 3. Switch Current Limit vs Duty Cycle
TPS61161-Q1 v_scale_lvs791.gif
Figure 5. FB Voltage vs EasyScale Step
TPS61161-Q1 scope1_col_lvs791.gif
Figure 7. Output Ripple at PWM Dimming
TPS61161-Q1 scope3_col_lvs791.gif
Figure 9. Start-Up
TPS61161-Q1 eff3_io_lvs791.gif
Figure 2. Efficiency vs Output Current
TPS61161-Q1 scl_ta_lvs791.gif
Figure 4. Switch Current Limit vs Temperature
TPS61161-Q1 v_dc_lvs791.gif
Figure 6. FB Voltage vs PWM Duty Cycle
TPS61161-Q1 scope2_col_lvs791.gif
Figure 8. Switching Waveform
TPS61161-Q1 scope4_col_lvs791.gif
Figure 10. Open LED Protection
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