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      

SLVS278E – AUGUST 2000 – REVISED MARCH 2003

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D Independent Dual-Outputs Operate 180°

Out of Phase

D Wide Input Voltage Range: 4.5-V – 28-V

D Adjustable Output Voltage Down to 0.9 V

D Pin-Selectable PWM/SKIP Mode for High

Efficiency Under Light Loads

D Synchronous Buck Operation Allows up to

95% Efficiency

D Separate Standby Control and Overcurrent

Protection for Each Channel

D Programmable Short-Circuit Protection

D Low Supply (1 mA) and Shutdown (1 nA)

Current

D Power Good Output

D High-Speed Error Amplifiers

D Sequencing Easily Achieved by Selecting

Softstart Capacitor Values.

D 5-V Linear Regulator Power Internal IC

Circuitry

D 30-Pin TSSOP Packaging

description

The TPS5120 is a dual channel, high-efficiency synchronous buck controller where the outputs run 180 degrees

out of phase, which lowers the input current ripple, thereby reducing the input capacitance cost. The PWM/SKIP

pin allows the operating mode to switch from PWM mode to skip mode under light load conditions. The skip

mode enables a lower operating frequency and shortens the pulse width to the low-side MOSFET, increasing

the efficiency under light load conditions. These two modes, along with synchronous-rectifier drivers, dead time,

and very low quiescent current, allow power to be conserved and the battery life to be extended under all load

conditions. The 1.5 A (typical) high-side and low-side MOSFET drivers on-chip are designed to drive less

expensive N-channel MOSFETs. The resistorless current protection and fixed high-side driver voltage simplify

the power supply design and reduce the external parts count. Each channel is independent, offering a separate

controller, overcurrent protection, and standby control. Sequencing is flexible and can be tailored by choosing

different softstart capacitor values. Other features, such as undervoltage lockout, power good, overvoltage,

undervoltage, and programmable short-circuit protection promote system reliability.

        

         

       

   

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

INV1

FB1

SOFTSTART1

PWM/SKIP

5V_STBY

GND

REF

STBY1

STBY2

FLT

POWERGOOD

SOFTSTART2

FB2

INV2

LH1

OUT1_u

LL1

OUT1_d

OUTGND1

TRIP1

TRIP2

VREF5

REG5V_IN

OUTGND2

OUT2_d

LL2

OUT2_u

LH2

DBT PACKAGE

(TOP VIEW)

Summary of content (24 pages)

PAGE 1
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 D Independent Dual-Outputs Operate 180° D D D D D D D D D D D D Out of Phase Wide Input Voltage Range: 4.5-V – 28-V Adjustable Output Voltage Down to 0.
PAGE 2
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 typical design VI C1 R1 R2 Q1 U1 TPS5120DBT R3 GND C3 1 2 C4 3 4 C5 5 6 7 C6 8 9 10 C7 11 12 C8 13 14 15 R4 LH1 INV1 FB1 OUT1_u LL1 SOFTSTART1 PWM/SKIP CT 5V_STBY R7 OUT1_d OUTGND1 TRIP1 GND Vcc REF TRIP2 STBY1 VREF5 STBY2 REG5V_IN FLT OUTGND2 POWERGOOD OUT2_d LL2 SOFTSTART2 FB2 OUT2_u INV2 LH2 L1 D1 30 29 28 C13 27 26 VO1 Q2 C11 C15 25 R8 R9 24 23 22 2
PAGE 3
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 functional block diagram SOFTSTART1 SOFTSTART1 PWM Comp. LH1 Skip Comp. _ _ + DLY OUT1_u + LL1 DLY OUT1_d FB1 _ + + INV1 OUTGND1 _ Err Amp. + 0.85 V –(V CT CC _ FLT OVP1 UVLO SIGNAL + Current Protection Trigger STBY1 0.85 V+12% _ – VTRIP1) + _ OSC LSD Trip HSD Trip TRIP1 Current Comp. V CC – VTRIP1 OVP2 STBY2 + V CC 0.
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SLVS278E – AUGUST 2000 – REVISED MARCH 2003 AVAILABLE OPTIONS PACKAGE TA EVM TSSOP (DBT) TPS5120DBT –40°C 40°C to 85°C TPS5120EVM-151 TPS5120DBTR Terminal Functions TERMINAL NAME CT NO.
PAGE 5
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 Terminal Functions (Continued) TERMINAL NAME NO.
PAGE 6
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 detailed description (continued) current protection Overcurrent protection is achieved by comparing the drain-to-source voltage of the high-side and low-side MOSFET devices to a set-point voltage. This voltage is set using an external resistor between VCC and the TRIP1 or TRIP2 terminals.
PAGE 7
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 Table 1.
PAGE 8
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 absolute maximum ratings over operating free-air temperature (unless otherwise noted)† Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 30 V Input voltage: INV1, INV2, CT, PWM/SKIP, REG5V_IN, SOFTSTART1, SOFTSTART2, . . . . . –0.3 V to 7 V FLT, POWERGOOD . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 9
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 electrical characteristics over recommended free-air temperature range, VCC = 7 V (unless otherwise noted) reference voltage PARAMETER Vref TEST CONDITIONS MIN Reference voltage TYP MAX 0.85 V I = 50 µA –1% 1% Reference voltage tolerance TA = 25°C, TA = –20°C to 85°C, I = 50 µA –1.5% 1.5% I = 50 µA –2% R(egin) Line regulation TA = –40°C to 85°C, VCC = 4.
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SLVS278E – AUGUST 2000 – REVISED MARCH 2003 electrical characteristics over recommended free-air temperature range, VCC = 7 V (unless otherwise noted) (continued) 5-V regulator PARAMETER IO = 0 mA to 50 mA, TA = 25°C VCC = 5.5 V to 28 V, Load regulation VCC = 5.
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SLVS278E – AUGUST 2000 – REVISED MARCH 2003 TYPICAL CHARACTERISTICS QUIESCENT CURRENT vs JUNCTION TEMPERATURE QUIESCENT CURRENT (SHUTDOWN) vs JUNCTION TEMPERATURE 1200 1.25 VCC = 28 V Icc(s) – Quiescent Current – nA Icc – Quiescent Current – mA 1.30 1.20 1.15 1.10 VCC = 4.5 V VCC = 7 V 1.05 –50 0 50 100 TJ – Junction Temperature – °C 1000 VCC = 28 V 800 VCC = 7 V 600 400 VCC = 4.
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SLVS278E – AUGUST 2000 – REVISED MARCH 2003 TYPICAL CHARACTERISTICS DRIVE OUTPUT CURRENT (OUT_d) vs DRIVE OUTPUT VOLTAGE 1.80 –2.00 TJ = –40 °C I O(SINK) – Drive Output Current (OUT_d) – A I O(SOURCE) – Drive Output Current (OUT_d) – A DRIVE OUTPUT CURRENT (OUT_d) vs DRIVE OUTPUT VOLTAGE TJ = –20 °C –1.80 TJ = 25 °C –1.60 –1.40 –1.20 –1.00 –0.80 0.5 TJ = 85 °C TJ = 125 °C 1.5 2.5 2 3 VO – Drive Output Voltage (OUT_d) – V 1 1.
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SLVS278E – AUGUST 2000 – REVISED MARCH 2003 TYPICAL CHARACTERISTICS ERROR AMPLIFIER OUTPUT VOLTAGE vs JUNCTION TEMPERATURE ERROR AMPLIFIER INPUT OFFSET VOLTAGE vs JUNCTION TEMPERATURE VO+ – Positive Error Amplifier Output Voltage – V V IO – Error Amplifier Input Offset Voltage – mV 2.55 2.50 VCC = 28 V 2.45 2.40 2.35 2.30 VCC = 4.5 V, VCC = 7 V 2.25 2.20 –50 0 50 100 TJ – Junction Temperature – °C 150 3.00 VCC = 4.
PAGE 14
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 TYPICAL CHARACTERISTICS VREF5 SHORT-CIRCUIT OUTPUT CURRENT vs JUNCTION TEMPERATURE VREF5 OUTPUT VOLTAGE vs OUTPUT CURRENT –120 5.20 – VREF5 Short–Circuit Output Current – mA OS TJ = 125 °C VO – VREF5 Output Voltage – V 5.10 5.00 4.90 TJ = 85 °C 4.80 4.70 TJ = 25 °C 4.60 TJ = –40 °C –80 VCC = 28 V –60 –40 –20 VCC = 7 V VCC = 4.5 V I TJ = –20 °C –100 4.
PAGE 15
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 TYPICAL CHARACTERISTICS REG5V_IN HYSTERESIS VOLTAGE vs JUNCTION TEMPERATURE REG5V_IN THRESHOLD VOLTAGE vs JUNCTION TEMPERATURE 140 4.7 Vhys – REG5V_IN Hysteresis Voltage – mV V(TO) – REG5V_IN Threshold Voltage – V 4.7 V(TO_L) 4.6 4.6 4.5 V(TO_H) 4.5 4.4 –50 0 50 100 TJ – Junction Temperature – °C 120 100 80 60 40 20 0 –50 150 Figure 18 OVP THRESHOLD VOLTAGE vs JUNCTION TEMPERATURE –2.
PAGE 16
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 TYPICAL CHARACTERISTICS SCP (OVP) SOURCE CURRENT vs JUNCTION TEMPERATURE POWERGOOD THRESHOLD VOLTAGE vs JUNCTION TEMPERATURE –12.0 900 875 –11.9 V(TO_H) 925 SCP (OVP) Source Current – µ A V(TO) – Powergood Threshold Voltage – mV 950 VCC = 4.5 V, VCC = 7 V, VCC = 28 V 850 825 VCC = 4.5 V, VCC = 7 V, VCC = 28 V 800 775 750 –50 –11.8 VCC = 7 V, VCC = 28 V –11.7 –11.6 –11.5 –11.4 –11.3 VCC = 4.
PAGE 17
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 TYPICAL CHARACTERISTICS OUTPUT MAXIMUM DUTY CYCLE vs JUNCTION TEMPERATURE OSCILLATOR FREQUENCY vs CAPACITANCE 85.0 VCC = 7 V, TJ = 25 °C Output Maximum Duty Cycle – % f OSC – Oscillator Frequency – kHz 1000 100 VCC = 7 V, VCC = 28 V 84.5 84.0 83.5 83.0 VCC = 4.5 V 82.5 82.0 81.5 fosc = 300 kHz 10 0 81.
PAGE 18
SLVS278E – AUGUST 2000 – REVISED MARCH 2003 TYPICAL CHARACTERISTICS DRIVER DEAD TIME (OUT_u FALL) vs JUNCTION TEMPERATURE DRIVER DEAD RISE TIME (OUT_u RISE) vs JUNCTION TEMPERATURE 175.0 100 Driver and Dead Rise Time (OUT_u RISE) VCC = 4.5 V Driver Dead Time – ns 172.5 170.0 167.5 165.0 162.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPS5120DBTR Package Package Pins Type Drawing TSSOP DBT 30 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 16.4 Pack Materials-Page 1 6.95 B0 (mm) K0 (mm) P1 (mm) 8.3 1.6 8.0 W Pin1 (mm) Quadrant 16.
PAGE 22
PACKAGE MATERIALS INFORMATION www.ti.com 24-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS5120DBTR TSSOP DBT 30 2000 367.0 367.0 38.
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