LP8728B-Q1

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SNVSA70 – FEBRUARY 2015

Electrical Characteristics

(1)(2) (continued)

Unless otherwise noted, VIN = 5 V, typical values apply for TA = 25°C, and minimum/maximum limits apply over junction

temperature range, TJ = –40°C to 125°C.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ILK_SW

Switch pin leakage current

VOUT = 1.8V

1

µA

Pulldown resistor from FB_Bx pin to

Only active when converter disabled.

RPD_FB

40

70

100

Ω

GND

All limits apply for TA = 25°C

KRAMP

Slew rate control

DEFSEL from 0 to 1

10

mV/µs

Time from first EN_Bx high to start of

TSTART

Start-up time

420

µs

switching

KSTART

Soft-start VOUT slew rate

18

mV/µs

VOLTAGE MONITORING

Power good threshold for voltage rising

93.5%

96%

98%

VPG

Power good threshold voltage

Power good threshold for voltage falling

91%

93%

95%

Voltage monitored on AVDD Pin,

V

5.5

5.7

5.9

Input overvoltage protection trigger

voltage rising

VOVP

point

Hysteresis

80

mV

Voltage monitored on AVDD Pin,

V

2.7

Input undervoltage lockout (UVLO)

voltage falling

VUVLO

threshold.

Hysteresis

80

mV

THERMAL SHUTDOWN AND MONITORING

Threshold, temperature rising

150

TSD

Thermal shutdown

°C

Hysteresis

20

6.6 System Characteristics

(1) (2) (3)

Typical values apply for TA = 25°C. Unless otherwise noted, VIN = 5 V.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IOUT 10% max load → 90% max load, 1-

70

mV

µs load step

Load transient response

IOUT 90% max load → 10% max load, 1-

ΔVOUT

70

mV

µs load step

VIN_Bx stepping 4.5 V ↔ 5.5 V, tRISE =

Line transient response

20

mV

tFALL = 10 µs, IOUT = 400 mA

VRIPPLE

Output voltage ripple

COUT ESR = 10 mΩ, IOUT = 200 mA

10

mVPP

VOUT = 3.3 V, IOUT = 300 mA

94%

VOUT = 2.65 V, IOUT = 300 mA

92%

η

Efficiency

VOUT = 1.8 V, IOUT = 300 mA

89%

VOUT = 1.5 V, IOUT = 300 mA

87%

VOUT = 1.2 V, IOUT = 300 mA

85%

(1)

All voltage values are with respect to network ground terminal.

(2)

Minimum (Min) and Maximum (Max) limits are specified by design, test, or statistical analysis. Typical (Typ) numbers are not verified, but

do represent the most likely norm. Unless otherwise specified, conditions for Typ specifications are: VIN = 5 V and TJ = 25°C.

(3)

System Characteristics are highly dependent on external components and PCB layout. System Characteristics are verified using

inductor type: TOKO MDT2520-CN1R5M, input and output capacitor type: MuRata GRM21BR71A106KE51L.

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