TS51221

Final Datasheet

Rev 1.1

April 6, 2015

www.semtech.com

6 of 18

Semtech

Regulator Characteristics

ElectricalCharacteristics,T

Symbol

Parameter

Condition

Min

Typ Max Unit

Switch Mode Regulator: L=4.7uH and C=2 x 22uF

V

OUT-PWM

OutputVoltageToleranceinPWM

Mode

I

V

2%

V

V

2%

V

V

OUT-PFM

OutputVoltageToleranceinPFM

Mode

I

V

1%

V

1%

V

3.5%

V

R

DSON

HighSideSwitchOnResistance

I

180

mΩ

LowSideSwitchOnResistance

I

120

mΩ

I

OUT

OutputCurrent

1

A

I

OCD

OverCurrentDetect

HSswitchcurrent

1.4

1.8

2.4

A

FB

TH

FeedbackReference(Adjustable

Mode)

(Note3)

0.886

0.9

0.914

V

FB

TH-TOL

FeedbackReferenceTolerance

(Note3)

-1.5

1.5

%

T

SS

SoftstartRampTime

4

ms

FB

TH-PFM

PFMModeFBComparatorThreshold

V

1%

V

V

OUT-UV

91%

V

OUT

93%

V

OUT

95%

V

OUT

V

OUT-UV_HYST

1.5%

V

OUT

V

OUT-OV

103%

V

OUT

V

OUT-OV_HYST

1%

V

OUT

DUTY

MAX

MaxDutyCycle

(Note2)

95%

97%

99%

Note 1: R

Note 2: Regulator VSW pin is forced off for 240ns every 8 cycles to ensure the BST cap is replenished.

Note 3: For the adjustable version, the ratio of VCC/V

Note 4: Based on Over Current Detect testing