SR10000 Series

No.0001-4/8

Electrical Characteristics

Overall Operating Characteristics at Ta = 25

°C, in the specified test circuit

Ratings

Parameter

Symbol

Conditions

min

typ

max

Unit

Output voltage

VOUT

VIN=2V, IO=10mA

3.217

3.300

3.383

V

Output voltage setting range

VOSET

VIN=VOSET×0.6, VDD=3.3V, IOUT=10mA

1.5

*2

V

FB control voltage

VFB

0.9

V

Supply voltage

VDD

*3

1.8

10

V

Operation start voltage

VST

IO=1mA

0.9

V

VIN=2V, IO=0mA SR10060

29

41

µA

VIN=2V, IO=0mA SR10030

45

64

µA

VIN=2V, IO=0mA SR10020, SR10070

62

88

µA

Current dissipation

IDD

VIN=2V, IO=0mA SR10040, SR10050

97

137

µA

Standby current

ISTB

VIN=2V, VCE=0V

1

µA

VIN=2V, IO=10mA SR10060

85

100

115

kHz

VIN=2V, IO=10mA SR10030

153

180

207

kHz

VIN=2V, IO=10mA SR10020, SR10070

255

300

345

kHz

Oscillator frequency

FOSC

VIN=2V, IO=10mA SR10040, SR10050

425

500

575

kHz

Efficiency

EFFI

85

%

CE high voltage

VCEH

0.65

V

CE low voltage

VCEL

0.20

V

PWM high voltage

VPWMH

SR10030, SR10060, SR10070 *4

VDD-0.2

V

PWM low voltage

VPWML

SR10030, SR10060, SR10070 *4

VDD-1.0

V

CE high current

ICEH

CE=VDD=3.3V

0.1

µA

CE low current

ICEL

CE=0V

0.1

µA

*2: The output setting maximum voltages are within 1/1.5 times the VDSS of the built-in MOSFET and within 1/1.5

times the VRRM of the Di as a general rule of thumb. As such, it must be verified during actual operation that they

do not exceed the rated voltages.

*3: VDD should be 1.8V or higher when VIN or other power source is supplying VDD since the output voltage and

oscillating frequency become steady when VDD is set 1.8V or higher, although the built-in IC starts step-up voltage

operation from VDD=0.8V.

*4: For models SR10030, SR10060, and SR10070, the CE pin also serves to implement a PWM/PFM external

switching function. When the voltage is VDD-0.2V or more, PWM control is exercised, and when it is VCEH or

more but VDD-1.0V or less, PWM/PFM automatic switching at a duty ratio of 25% is controlled.

Di Characteristics at Ta = 25

°C, in the specified test circuit

Parameter

Symbol

Conditions

min

typ

max

unit

Forward voltage 1

VF1

IF=1A

0.43

0.47

V

Reverse current 1

IR1

SR10020, SR10030

SR10040, SR10060

VR=30V

40

200

µA

Forward voltage 2

VF2

IF=1A

0.30

0.35

V

Reverse current 2

IR2

SR10050, SR10070

VR=6V

600

µA

Pin Functions

Pin No.

Pin Name

Description

1A

GND

Ground pin for IC.

1B, 1C

TR Source

Source pin for TR

1D, 1E, 2D, 2E, 3E

TR Drain, Di Anode

Drain of TR and Anode of Diode

2A, 2B, 2C, 3A, 3B, 3C

4A, 4B, 4C,5B

IC VDD

Supply voltage for IC

3D

IC EXT, TR Gate

Gate for TR

4D, 4E, 5D, 5E

Di Cathode

Cathode of Diode and VOUT

5A

IC CE

Operation starts when chip enable pin is set to “high”. This pin also serves as a

PWM/PFM selector for models SR10030, SR10060, and SR10070.

5C

IC FB

External resistance connecting pin for output voltage setting, internal control voltage:

0.9V typical