TPS62400DRC

Manufacturer Part NumberTPS62400DRC
Description2.25MHz 400mA/600mA Dual Step-Down Converter In Small 3x3mm QFN Package
ManufacturerTI [Texas Instruments]
TPS62400DRC datasheet
 


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2.25MHz 400mA/600mA Dual Step-Down Converter In Small 3x3mm QFN Package
FEATURES
High Efficiency—Up to 95%
V
Range From 2.5 V to 6 V
IN
2.25 MHz Fixed Frequency Operation
Output Current 400 mA and 600 mA
Adjustable Output Voltage From 0.6V to V
EasyScale™ Optional One-Pin Serial Interface
for Dynamic Output Voltage Adjustment
TPS62401, TPS62403 Fixed Output Voltage
Options
Power Save Mode at Light Load Currents
180 Out of Phase Operation
Output Voltage Accuracy in PWM Mode 1%
Typical 32- A Quiescent Current for both
Converters
100% Duty Cycle for Lowest Dropout
One Pin Simple Dynamic Voltage Scaling
Available in a 10-Pin QFN (3 3mm)
APPLICATIONS
Cell Phones, Smart-phones
PDAs, Pocket PCs
OMAP™ and Low Power DSP Supply
Portable Media Players
Digital Radio
Digital Cameras
TPS62401
VIN 2.5 V – 6 V
VIN
FB 1
2.2 H
m
10 F
m
SW1
DEF_1
EN_1
EN_2
2.2 H
m
SW2
MODE/
DATA
ADJ2
GND
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.
EasyScale, OMAP, PowerPAD are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
DESCRIPTION
The TPS6240x device series are synchronous dual
step-down DC-DC converters optimized for battery
powered portable applications. They provide two
independent output voltage rails powered by 1-cell
Li-Ion or 3-cell NiMH/NiCD batteries. The devices are
also suitable to operate from a standard 3.3V or 5V
IN
voltage rail.
With an input voltage range of 2.5V to 6V the
TPS62400 is ideal to power portable applications like
smart phones, PDAs and other portable equipment.
With the EasyScale™ serial interface the output
voltages can be modified during operation. The fixed
output voltage versions TPS62401 and TPS62403
support one pin controlled simple Dynamic Voltage
Scaling for low power processors.
The TPS6240x operates at 2.25MHz fixed switching
frequency and enters the power save mode
operation at light load currents to maintain high
efficiency over the entire load current range. For low
noise applications the devices can be forced into
fixed
frequency
MODE/DATA pin high. In the shutdown mode, the
current consumption is reduced to 1.2 A, typical.
The devices allow the use of small inductors and
capacitors to achieve a small solution size.
The TPS62400 is available in a 10-pin leadless
package (3 3mm QFN)
100
90
80
V
: 1.575 V
70
V OUT2 = 1.8 V
out1
400 mA
60
10 F
m
50
40
30
V
: 1.8 V
out2
20
600 mA
10
10 F
m
0
0.01
TPS62400, , TPS62401
TPS62403
SLVS681C – JUNE 2006 – REVISED DECEMBER 2006
PWM
mode
by
pulling
V IN = 3.6 V
MODE/DATA = 0
V OUT1 = 1.575 V
0.1
1
10
100
I OUT mA
Copyright © 2006, Texas Instruments Incorporated
the
1000

TPS62400DRC Summary of contents

  • Page 1

    Dual Step-Down Converter In Small 3x3mm QFN Package FEATURES High Efficiency—Up to 95% V Range From 2 2.25 MHz Fixed Frequency Operation Output Current 400 mA and 600 mA Adjustable Output Voltage ...

  • Page 2

    ... DEF_1 = Low 1.575V Fixed default 2.8V 600mA (1) POWER RATING FOR 2050mW Submit Documentation Feedback www.ti.com (2) QFN ORDERING PACKAGE PACKAGE MARKING DRC TPS62400DRC BQE DRC TPS62401DRC BRN DRC TPS62403DRC BYI VALUE UNIT –0 –0 +0. 0.5 mA –0 – ...

  • Page 3

    ELECTRICAL CHARACTERISTICS V = 3.6V 1.8V MODE = GND 2 OUT (unless otherwise noted) PARAMETER SUPPLY CURRENT V Input voltage range IN I Operating quiescent ...

  • Page 4

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 ELECTRICAL CHARACTERISTICS (continued 3.6V 1.8V MODE = GND 2 OUT (unless otherwise ...

  • Page 5

    PIN ASSIGNMENTS TERMINAL I/O NO. NAME (QFN) ADJ2 1 I Input to adjust output voltage of converter 2. In adjustable version (TPS62400) connect a external resistor divider between VOUT2, this pin and GND to set output voltage between 0.6V ...

  • Page 6

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 FUNCTIONAL BLOCK DIAGRAM Converter 1 Thermal Softstart Shutdown EN1 VREF Ext. res. network Error Amp. Internal DEF1 Int. Resistor FB compensated VOUT1 Network C 25pF ff Register RI ...

  • Page 7

    PARAMETER MEASUREMENT INFORMATION VIN 2.5 V – VIN EN_1 EN_2 MODE/ DATA TABLE OF GRAPHS AND FIGURES Efficiency TPS62401 VOUT1 = 1.1V Efficiency TPS62401 VOUT1 = 1.575V Efficiency VOUT 2 = 1.8V ...

  • Page 8

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 TYPICAL CHARACTERISTICS (continued) Typical Operation V = 3.6V 1.8V OUT1 Typical Operation V = 3.6V 1.2V OUT1 V Change With ...

  • Page 9

    EFFICIENCY VOUT 2 = 1.8V 100 V = 1.8 V OUT2 2 3 Power Save Mode Forced PWM Mode 30 ...

  • Page 10

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 EFFICIENCY vs V 100 I = 100 mA OUT OUT I OUT Figure ...

  • Page 11

    DC OUTPUT ACCURACY V OUT OUT 1.650 V = 1.575 V OUT1 MODE/DATA = low, PFM Mode, voltage positioning active 1.625 V 1.600 2.7 V ...

  • Page 12

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 I FOR BOTH CONVERTERS, NOT SWITCHING 85°C 36 25° -40° 2.5 3 3 Figure ...

  • Page 13

    OUTPUT VOLTAGE RIPPLE IN FORCED PWM MODE Mode/Data = high, forced PWM MODE operation IOUT = 10mA VOUT = 1.8V 20mV/Div Inductor current 100mA/Div Time base - 400 ns/Div Figure 19. FORCED PWM/PFM MODE TRANSITION MODE/DATA 1V/Div Forced PWM ...

  • Page 14

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 LOAD TRANSIENT RESPONSE PWM OPERATION MODE/DATA = high VOUT = 1.575V 50mV/Div PWM Mode operation IOUT 200mA/Div IOUT1 = 360mA IOUT= 40mA Time base - 50 s/Div m ...

  • Page 15

    TYPICAL OPERATION 1.575V, V OUT1 OUT2 SW1 5V/Div I 200mA/Div coil1 SW2 5V/Div I 200mA/Div coil2 V 3.6V 1.575V OUT1 V : 1.8V OUT2 OUT1 Time base - 100 ns/Div ...

  • Page 16

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 Each converter integrates two current limits, one in the P-channel MOSFET and another one in the N-channel MOSFET. When the current in the P-channel MOSFET reaches its current ...

  • Page 17

    DETAILED DESCRIPTION (continued) VIN DCDC I + OUT_PFM_leave order to keep the output voltage ripple in Power Save Mode low, the output voltage is monitored with a single threshold comparator (skip comparator). As the output voltage ...

  • Page 18

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 EN V OUT 100% Duty Cycle Low Dropout Operation The converters offer a low input-to-output voltage difference while still maintaining operation with the use of the 100% duty ...

  • Page 19

    DETAILED DESCRIPTION (continued) Pulling the MODE/DATA pin high forces both converters to operate constantly in the PWM mode, even at light load currents. The advantage is that the converters operate with a fixed frequency, allowing simple filtering of the ...

  • Page 20

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 converters. The interface is based on a master – slave structure, where the master is typically a microcontroller or application processor. Figure 33 device specific address byte and ...

  • Page 21

    Bit Decoding The bit detection is based on a PWM scheme, where the criterion is the relation between t be simplified to: High Bit: t > but with t High Low High Low Bit: t > t ...

  • Page 22

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 BYTE BIT NAME TRANSMISSION NUMBER DIRECTION Device 7 DA7 Address 6 DA6 Byte 5 DA5 4 DA4 4Ehex 3 DA3 2 DA2 1 DA1 0 DA0 Databyte 7(MSB) ...

  • Page 23

    Figure 36. EasyScale™– Bit Coding MODE/DATA Power Save Mode Figure 37. MODE/DATA PIN: Mode Selection t Start Address Byte MODE/DATA Power Save Mode Figure 38. MODE/DATA Pin: Power Save Mode/Interface Communication SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 ...

  • Page 24

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 Table 4. Selectable Output Voltages for Converter 1, TPS62401 OUTPUT VOLTAGE [V] REGISTER REG_DEF_1_LOW 0 1 0.825 2 3 0.875 4 5 0.925 6 7 0.975 8 9 ...

  • Page 25

    Table 5. Selectable Output Voltages for Converter 1, With DEF1 Pin as Analog Input (Adjustable, TPS62400) TPS62400 OUTPUT VOLTAGE [V] REGISTER REG_DEF_1_LOW 0 V Adjustable with Resistor Network on DEF_1 Pin (default OUT1 0.6V with DEF_1 connected to V ...

  • Page 26

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 Table 6. Selectable Output Voltages for Converter Adjustable with resistor network and C OUT2 0.6V with ADJ2 pin directly connected ...

  • Page 27

    OUTPUT VOLTAGE SETTING Converter1 Adjustable Default Output Voltage Setting: TPS62400 The output voltage can be calculated to OUT REF keep the operating current to a minimum recommended ...

  • Page 28

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 APPLICATION INFORMATION (continued) VIN 3.3 V – VIN EN_1 EN_2 MODE/ DATA Figure 40. Typical Application Circuit 1.5V/2.85V Adjustable Outputs VIN ...

  • Page 29

    APPLICATION INFORMATION (continued) VIN 2.5 V – VIN DEF_1 EN_1 EN_2 MODE/ DATA Figure 42. TPS62401 Fixed 1.1V/1.8V Outputs, low PFM Ripple Voltage Optimized VIN 2.5 V – VIN ...

  • Page 30

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 APPLICATION INFORMATION (continued) TPS62401/03 VIN 2.5 V – VIN 10 µF EN_1 EN_2 MODE / DATA Figure 44. Dynamic Voltage Scaling on Vout1 Controlled by DEF_1 ...

  • Page 31

    APPLICATION INFORMATION (continued) Vout 1 * Vin + Vout outmax Lmax 2 with Switching Frequency (2.25MHz typical Inductor Value I = Peak-to-Peak inductor ripple current L ...

  • Page 32

    TPS62400, , TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 At light load currents the converters operate in Power Save Mode and the output voltage ripple is dependent on the output capacitor value. The output voltage ripple is ...

  • Page 33

    SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 C OUT1 C IN GND Pin connected with Power Pad C OUT2 Figure 47. PCB Layout Submit Documentation Feedback TPS62400, , TPS62401 TPS62403 33 ...

  • Page 34

    ... PACKAGING INFORMATION (1) Orderable Device Status TPS62400DRCR ACTIVE TPS62400DRCRG4 ACTIVE TPS62400DRCT ACTIVE TPS62400DRCTG4 ACTIVE TPS62401DRCR ACTIVE TPS62401DRCRG4 ACTIVE TPS62401DRCT ACTIVE TPS62401DRCTG4 ACTIVE TPS62403DRCR ACTIVE TPS62403DRCT ACTIVE TPS62403DRCTG4 ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. ...

  • Page 35

    Customer on an annual basis. PACKAGE OPTION ADDENDUM Addendum-Page 2 12-Dec-2006 ...

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    Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the ...