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Table Of Contents

FEATURES
APPLICATIONS
DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
PACKAGE SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
PIN ASSIGNMENT
TYPICAL CHARACTERISTICS (5-V INPUT) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the converter. Applies to , , and . The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to modules soldered directly to a 100-mm × 100-mm, double-sided PCB with 2-oz. copper. Applies to .
TYPICAL CHARACTERISTICS (12-V INPUT) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the converter. Applies to , , and . The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to modules soldered directly to a 100-mm × 100-mm, double-sided PCB with 2-oz. copper. Applies to .
APPLICATION INFORMATION
REVISION HISTORY

PTH08080W

SLTS235D –FEBRUARY 2005–REVISED SEPTEMBER 2013

www.ti.com

Designing for Load Transients

The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of

1 A/µs. The typical voltage deviation for this load transient is given in the data-sheet specification table using the

optional value of output capacitance. As the di/dt of a transient is increased, the response of a converter's

regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent limitation with

any dc/dc converter once the speed of the transient exceeds its bandwidth capability. If the target application

specifies a higher di/dt or lower voltage deviation, the requirement can only be met with additional output

capacitor decoupling. In these cases, special attention must be paid to the type, value, and ESR of the

capacitors selected.

If the transient performance requirements exceed those specified in the data sheet, the selection of output

capacitors becomes more important. Review the minimum ESR in the characteristic data sheet for details on the

capacitance maximum.

Table 3. Recommended Input/Output Capacitors

CAPACITOR CHARACTERISTICS QUANTITY

85°C

CAPACITOR VENDOR/

EQUIVALENT

VENDOR

WORKING MAXIMUM PHYSICAL OUTPUT

COMPONENT

VALUE SERIES INPUT

NUMBER

VOLTAGE RIPPLE SIZE BUS

SERIES

(µF) RESISTANCE BUS

(1)

(V) CURRENT (mm) (Optional)

(ESR) (Ω)

rms

) (mA)

Panasonic WA (SMT) 20 150 0.026 3700 10 × 10,2 1 ≤ 2 EEFWA1D151P

FC (SMT) 25 220 0.150 670 10 × 10,2 1 1 EEVFC1E221P

Panasonic SL 6.3 47 0.018 2500 7,3 × 4,3 N/R

(2)

≤ 3 EEFCD0J470R

SP-cap(SMT) 6.3 120 0.007 3500 7,3 × 4,3 N/R

(2)

≤ 1 EEFSD0J121R

United Chemi-con PXA 16 150 0.026 3400 10 × 7,7 1 ≤ 2 PXA16VC151MJ80TP

(SMT) V

< 14 V

PS 25 100 0.020 4300 10 × 12,5 1 ≤ 2 25PS100MJ12

LXZ 35 220 0.180 760 10 × 12,5 1 1 LXZ35VB221M10X12LL

MVZ (SMT) 25 470 0.090 670 10 ×10 1 1 MVZ25VC471MJ10TP

Nichicon UWG (SMT) 35 100 0.150 670 10 × 10 1 1 UWG1V101MNR1GS

F559(Tantalum) 10 100 0.055 2000 7,7 × 4,3 N/R

(3)

≤ 3 F551A107MN

HD 25 220 0.072 760 8 × 11,5 1 1 UHD1E221MPR

Sanyo Os-con\ POS-Cap 10 68 0.025 2400 7,3 × 4,3 N/R

(2)

≤ 2 10TPE68M

SVP (SMT) 20 150 0.020 4320 10 × 12,7 1 ≤ 1 20SVP150M

SP 20 120 0.024 3110 8 × 10,5 1 ≤ 2 20SP120M

AVX Tantalum TPS (SMD) 35 47 0.100 1430 7,3 × 4,3 × 2 ≤ 4 TPSV476M035R0100

25 47 0.100 1150 4,1 2 ≤ 4 TPSE476M025R0100

7,3 × 4,3 × V

< 13 V

4,1

Kemet T520 (SMD) 10 100 0.025 > 2000 7,3 × 5,7 × 4 N/R

(2)

≤ 1 T520V107M010ASE025

AO-CAP 6.3 100 0.018 > 2900 7,3 × 5,7 × 4 N/R

(2)

≤ 1 A700V107M006AT

Vishay/Sprague 35 47 0.280 > 1000 7,3 × 6 × 4,1 2 ≤ 5 595D476X0035R2T

594D/SVP(SMD) 20 100 0.025 3200 8 × 12 1 ≤ 2 94SVP107X0020E12

94SS 20 150 0.030 3200 10 × 10,5 1 ≤ 2 94SS157X0020FBP

Murata Ceramic X5R 16 47 0.002 > 1400 3225 1

(4)

≤ 3 GRM32ER61C476M

< 14 V

TDK ceramic X5R 6.3 47 0.002 > 1400 3225 N/R

(2)

≤ 3 C3225X5R0J476MT

< 5.5 V

Kemet Ceramic X5R 6.3 47 0.002 > 1400 3225 N/R

(2)

≤ 3 C1210C476K9PAC

< 5.5 V

TDK Ceramic X7R 25 10 0.002 > 1400 3225 1

(4)

≤ 4 C3225X7R1E106K

Murata Ceramic X5R 25 10 0.002 > 1400 1

(4)

≤ 4 GRM32DR61E106KA12

Kemet 16 10 0.002 > 1400 1

(4)

≤ 4 C1210C106M4PAC

< 14 V

TDK Ceramic X7R 25 2.2 0.002 > 1400 3225 1 1 C3225X7R1E225KT/MT

Murata Ceramic X7R 25 2.2 0.002 > 1400 1 1 GRM32RR71J225KC01L

Kemet 25 2.2 0.002 > 1400 1 1 C1210C225K3RAC

(1) The voltage rating of the input capacitor must be selected for the desired operating input voltage range of the regulator. To operate the

regulator at a higher input voltage, select a capacitor with a higher voltage rating.

(2) Not recommended (N/R). The voltage rating of this capacitor only allows it to be used for output voltages bus and voltage of < 5.5 V.

(3) The voltage rating of the input capacitor must be selected for the desired operating input voltage range of the regulator. To operate the

regulator at a higher input voltage, select a capacitor with a higher voltage rating.

(4) Ceramic capacitors can be used to complement electrolytic types at the input bus by reducing high-frequency ripple current.

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