Richtek RT8203GA, RT8203PA Schematic [ru]

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RT8203

High-Efficiency, Quad Output, Main Power-Supply Controllers for Notebook Computers

General Description

The RT8203 dual step-down, Switch Mode Power Supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The RT8203 include two pulsewidth modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear regulators providing 5V and 3.3V always-on outputs. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the main SMPS outputs. The RT8203 include on-board power-up sequencing, a power good (PGOOD) output, internal softstart, and soft-shutdown output discharge that prevents negative voltages on shutdown. Richtek's proprietary MachPWMTM “instant-on” response, constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic mode maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include diode-emulation, which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications. The RT8203 provides a pin-selectable switching frequency, allowing either 200kHz/300kHz or 400kHz/500kHz operation of the 5V/3.3V SMPSs, respectively. The RT8203 is available in SSOP-28 package.

Ordering Information

RT8203

Package Type

A : SSOP-28

Lead Plating System P : Pb Free

G : Green (Halogen Free and Pb Free)

Note :

Richtek products are :

`RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.

`Suitable for use in SnPb or Pb-free soldering processes.

Features

zNo Current Sense Resistor Needed

z1.5% Output Voltage Accuracy

z3.3V and 5V 100mA Bootstrapped Linear Regulators

zInternal Soft-Start and Soft-Shutdown Output Discharge

zMach-PWM with 100ns Load Step Response

z3.3V and 5V Fixed or Adjustable Outputs

z7V to 24V Input Voltage Range

zUltrasonic Mode Operation 25kHz (min.)

zPower Good (PGOOD) Signal

zOver Voltage Protection

zUnder Voltage Protection

zOver Temperature Protection

zRoHS Compliant and 100% Lead (Pb)-Free

Applications

zNotebook and Subnotebook Computers

zPDAs and Mobile Communication Devices

z3- and 4-Cell Li+ Battery-Powered Devices

Pin Configurations

(TOP VIEW)

 

 

 

 

 

 

 

 

 

 

BOOT3

 

 

NC

 

 

28

 

 

PGOOD

 

2

27

 

 

PHASE3

 

 

 

 

 

 

 

 

ON3

 

3

26

 

 

UGATE3

 

 

 

 

 

 

 

 

ON5

 

4

25

 

 

LDO3

 

 

 

 

 

 

ILIM3

 

5

24

 

 

LGATE3

 

 

 

 

 

 

 

 

EN

 

6

23

 

 

GND

 

 

 

 

 

 

 

 

FB3

 

7

22

 

 

VOUT3

 

 

 

 

 

 

VREF

 

8

21

 

 

VOUT5

 

 

 

 

 

 

 

 

FB5

 

9

20

 

 

VIN

 

 

 

 

 

 

 

 

PRO

 

 

 

10

19

 

 

LGATE5

 

 

 

ILIM5

 

11

18

 

 

LDO5

 

 

 

 

SKIP

 

 

12

17

 

 

VCC

 

 

 

 

 

TON

 

13

16

 

 

UGATE5

BOOT5

 

14SSOP-2815

 

 

PHASE5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SSOP-28

DS8203-05 April 2011

www.richtek.com

 

1

RT8203

Typical Application Circuit

5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ALWAYS ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C1

+

 

 

 

 

 

 

 

18

 

 

 

 

VIN

 

 

 

 

 

 

 

 

 

 

 

 

 

7V to 24V

 

4.7µF

C2

 

R1

 

R2

 

 

LDO5

 

 

 

 

 

 

 

1µF

 

 

47

 

 

 

 

 

 

 

 

 

 

 

 

3.9

 

 

17

VCC

 

 

ON3 3

 

 

VREF

 

 

 

 

 

 

 

5

ILIM3

 

 

ON5 4

 

 

VCC

 

VCC

C3

 

 

 

 

11

ILIM5

 

 

LDO3 25

R6

C4

3.3V ALWAYS ON

 

1µF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

VIN

 

 

PRO

10

1M

4.7µF

 

 

 

 

 

 

 

 

RT8203

 

 

 

 

 

C5

 

 

 

 

 

 

 

 

 

 

 

 

BAT254

 

 

 

 

D2

 

 

 

 

 

0.1µF

 

 

 

 

 

 

 

ON

 

 

 

 

D1

 

 

 

 

 

EN 6

 

BAT254

 

 

 

 

R3

 

 

 

 

R4

 

OFF

 

 

 

 

 

 

2.2

14

BOOT5

 

 

BOOT3

28 2.2

C9

C7

 

 

C6

 

 

 

 

 

 

 

 

 

 

 

 

 

C8

 

 

 

 

 

 

 

0.1µF

10µF

 

 

10µF

 

 

 

0.1µF

 

 

UGATE3 26

 

Q2

 

 

 

 

 

Q1

 

 

16

UGATE5

 

 

 

VOUT5

L1

AO4702

 

 

 

 

 

 

 

 

 

AO4702

VOUT3

 

 

15

 

 

 

PHASE3 27

 

 

L2

5V

 

 

 

 

 

PHASE5

 

 

 

 

3.3V

C10

D3

BSC119N03

19

 

 

 

LGATE3 24

 

 

D4

C11

Q3

 

 

LGATE5

 

 

Q4

 

 

 

 

 

 

 

 

 

 

 

 

 

13

 

 

 

 

 

BSC119N03

 

 

 

 

 

 

SEE

TON

 

 

VOUT3 22

 

 

 

 

 

 

 

TABLE

21

VOUT5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SKIP 12

 

VCC

 

 

 

 

 

 

 

 

8

VREF

 

 

 

 

 

 

 

 

C12

 

 

 

 

FB3

7

 

 

 

 

 

 

 

 

 

9

 

 

 

 

 

 

 

 

 

 

 

 

 

FB5

 

 

NC 1

 

R5

 

 

 

 

 

0.22µF

 

 

 

 

 

 

 

 

 

 

 

 

 

23

GND

 

 

PGOOD 2

 

100k

Power-Good

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INDICATOR

 

Frequency-dependent Components

VOUT5

VOUT3

TON = VCC

TON = GND

TON = VCC

TON = GND

f = 200kHz

f = 400kHz

f = 300kHz

f = 500kHz

L1 = 7.6μH

L1 = 5.6μH

L2 = 4.7μH

L2 = 3μH

C10 = 330μF

C10 = 150μF

C11 = 470μF

C11 = 220μF

Figure 1. Fixed Voltage Regulator

www.richtek.com

DS8203-05 April 2011

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RT8203

5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ALWAYS ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C1

+

 

 

 

 

 

 

 

18

 

 

 

 

 

VIN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7V to 24V

 

4.7µF

C2

 

R1

 

R2

 

 

LDO5

 

 

 

 

 

 

 

 

 

1µF

 

 

47

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.9

 

 

17

VCC

 

 

ON3 3

 

 

 

VREF

 

 

 

 

 

 

 

5

ILIM3

 

 

ON5 4

 

 

 

VCC

 

 

VCC

C3

 

 

 

 

11

ILIM5

 

 

LDO3 25

R6

 

C4

3.3V ALWAYS ON

 

1µF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

VIN

 

 

PRO

10

1M

 

4.7µF

 

 

 

 

 

 

 

 

 

RT8203

 

 

 

 

 

 

 

C5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BAT254

 

 

 

 

D2

 

 

 

 

 

 

 

0.1µF

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

D1

 

 

 

 

 

EN 6

 

BAT254

 

 

 

 

 

R3

 

 

 

 

R4

 

 

 

OFF

 

 

 

 

 

 

2.2

14

BOOT5

 

 

BOOT3

28 2.2

C9

 

C7

 

 

 

C6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C8

 

 

 

 

 

 

 

0.1µF

 

10µF

 

 

 

10µF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1µF

 

 

UGATE3 26

 

 

Q2

 

 

 

 

 

 

Q1

 

 

16

UGATE5

 

 

 

 

 

VOUT5

L1

AO4702

 

 

 

 

 

 

 

 

 

 

AO4702

 

VOUT3

 

 

15

 

 

 

PHASE3 27

 

 

 

L2

 

5V

 

 

 

 

 

PHASE5

 

 

 

 

 

 

3.3V

C10

D3

BSC119N03

19

 

 

 

LGATE3 24

 

 

 

D4

C11

Q3

 

 

LGATE5

 

 

 

Q4

 

 

 

 

BSC119N03

 

 

 

 

 

 

 

 

 

13

 

 

 

 

 

 

 

 

 

 

 

 

 

SEE

TON

 

 

VOUT3 22

 

 

 

 

 

 

 

 

 

TABLE

21

VOUT5

 

 

 

 

 

 

R9

 

 

R7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FB3 7

 

 

 

 

6.5k

 

C13

15k

 

 

 

 

9

FB5

 

 

 

 

 

 

 

C14

 

 

 

 

 

 

 

SKIP 12

 

VCC

 

 

R10

0.1µF

0.1µF

R8

 

 

 

 

8

VREF

 

 

 

 

 

 

 

 

 

 

 

 

 

NC 1

 

 

 

 

10k

 

 

10k

 

C12

 

 

 

 

 

 

 

R5

 

 

 

 

 

 

 

0.22µF

 

 

23

GND

 

 

PGOOD 2

 

100k

Power-Good

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INDICATOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Frequency-dependent Components

VOUT5

VOUT3

TON = VCC

TON = GND

TON = VCC

TON = GND

f = 200kHz

f = 400kHz

f = 300kHz

f = 500kHz

L1 = 7.6μH

L1 = 5.6μH

L2 = 4.7μH

L2 = 3μH

C10 = 330μF

C10 = 150μF

C11 = 470μF

C11 = 220μF

Figure 2. Adjustable Voltage Regulator

DS8203-05 April 2011

www.richtek.com

3

RT8203

Functional Pin Description

Pin No.

 

Pin Name

Pin Function

1

 

NC

Connect to GND.

2

 

PGOOD

Power Good Open Drain Output. PGOOD is pulled low if either output is disable or is

 

more than 8.75% below its normal value.

 

 

 

 

 

 

 

 

VOUT3 Enable Input. The 3.3V SMPS is enable if ON3 is greater than the on level

3

 

ON3

and disable if ON3 is less than the off level. If ON3 is connected to VREF, the 3.3V

 

SMPS starts after the 5V SMPS reached regulation(delay start). Force ON3 below the

 

 

 

 

 

 

 

 

clear fault level to reset the fault latched.

 

 

 

 

VOUT5 Enable Input. The 5V SMPS is enable if ON5 is greater than the on level and

4

 

ON5

disable if ON5 is less than the off level. If ON5 is connected to VREF, the 5V SMPS

 

starts after the 3.3V SMPS reached regulation(delay start). Force ON5 below the clear

 

 

 

 

 

 

 

 

fault level to reset the fault latched.

 

 

 

 

VOUT3 Current Limit Adjustment. The GND-PHASE3 current limit threshold defaults

5

 

ILIM3

to 100mV if ILIM3 is tied to VCC. In adjustable mode, the current limit threshold is 1/10

 

the voltage seen at ILIM3 over 0.5V to 3V range. The logic threshold for switch over to

 

 

 

 

 

 

 

 

100mV default value is approximately VCC − 1V.

 

 

 

 

Enable Control Input. The device enters its 15μA supply current shutdown mode if EN

 

 

 

 

is less than the EN input falling edge trip level and does not restart until EN is greater

6

 

EN

than the EN input rising edge trip level. Connect EN to VIN for automatically startup.

 

 

 

 

EN can be connected to VIN through a resistive voltage divider to implement a

 

 

 

 

programmable undervoltage lockout.

7

 

FB3

VOUT3 Feedback Input. Connect FB3 to GND for fixed 3.3V operation. Connect FB3

 

to a resistive voltage divider from VOUT3 to GND to adjust the output from 2V to 5.5V.

 

 

 

 

 

 

 

 

2V Reference Output. Bypass to GND with a 0.22μF(MIN) capacitor. VREF can source

8

 

VREF

up to 100μA for external loads. Loading VREF degrades FBx and VOUTx accuracy

 

 

 

 

according to the VREF load regulation error.

9

 

FB5

VOUT5 Feedback Input. Connect FB5 to GND for fixed 5V operation. Connect FB5 to

 

a resistive voltage divider from VOUT5 to GND to adjust the output from 2V to 5.5V.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Over Voltage and Under Voltage Fault Protection Enable/Disable. Connect

PRO

to

 

 

PRO

10

 

VCC to disable Over Voltage and Under Voltage protection. Connect PRO to GND to

 

 

 

 

 

 

 

enable Over Voltage and Under Voltage protection.

 

 

 

 

VOUT5 Current Limit Adjustment. The GND − PHASE5 current limit threshold defaults

11

 

ILIM5

to 100mV if ILIM5 is tied to VCC. In adjustable mode, the current limit threshold is 1/10

 

the voltage seen at ILIM5 over 0.5V to 3V range. The logic threshold for switch over to

 

 

 

 

 

 

 

 

100mV default value is approximately VCC − 1V.

 

 

 

 

 

 

 

 

 

 

 

Operation Mode Input Control. Connect SKIP to GND for diode-emulation mode

12

 

SKIP

 

(DEM) or to VCC for CCM mode(fixed frequency). Connect to VREF or floating for

 

 

 

 

 

 

 

ultrasonic mode.

13

 

TON

Frequency Select Input. Connect to VCC for 200kHz/300kHz operation and to GND

 

for 400kHz/500kHz operation (VOUT5/VOUT3 switching frequency respectively).

 

 

 

 

14

 

BOOT5

Boost Capacitor Connection for 5V SMPS. Connect an external ceramic capacitor to

 

PHASE5 and an external diode to LDO5.

 

 

 

 

 

To be continued

www.richtek.com

DS8203-05 April 2011

4

 

RT8203

Pin No.

Pin Name

Pin Function

15

PHASE5

Inductor Connection for 5V SMPS. PHASE5 is the internal lower supply rail for the

UGATE5 high side gate driver, and the current sense input for the 5V SMPS.

 

 

16

UGATE5

High Side N-MOSFET Floating Gate-Driver Output for VOUT5. Swings between

PHASE5 and BOOT5.

 

 

17

VCC

Analog Supply Voltage Input for the internal analog integrated circuit. Bypass to GND

with a 1μF ceramic capacitor.

 

 

 

 

5V Linear Regulator Output. LDO5 is the gate driver supply for the external

 

 

MOSFETs. LDO5 can provide a total of 100mA, including the MOSFET gate-driver

18

LDO5

requirements and external loads. If VOUT5 is greater than the LDO5 switchover

 

 

threshold, the LDO5 regulator shuts down and LDO5 pin connects to VOUT5 through

 

 

a 1.4Ω switch. Bypass a 4.7μF ceramic capacitor to GND.

19

LGATE5

Low side N-MOSFET Gate-Drive Output for VOUT5. Swings between GND and

LDO5.

 

 

20

VIN

Power-Supply Input. VIN powers the LDO5/LDO3 linear regulators and is also used

for PWM control circuits. Connect VIN to the battery input or the AC adapter output.

 

 

 

 

VOUT5 Sense Input. Connect to the 5V output. VOUT5 is an input to the PWM control

21

VOUT5

circuit. It also serves as the 5V feedback input in fixed-voltage mode. If VOUT5 is

greater than the LDO5 switchover threshold, the LDO5 shuts down and LDO5

 

 

 

 

connects to VOUT5 through 1.4Ω switch.

 

 

VOUT3 Sense Input. Connect to the 3.3V output. VOUT3 is an input to the PWM

22

VOUT3

control circuit. It also serves as the 3.3V feedback input in fixed voltage mode. If

VOUT3 is greater than the LDO3 switchover threshold, the LDO3 shuts down and

 

 

 

 

LDO3 connects to VOUT3 through 1.5Ω switch.

23

GND

Analog and Power Ground.

24

LGATE3

Low side N-MOSFET Gate-Drive Output for VOUT3. Swings between GND and

LDO5.

 

 

 

 

3.3V Linear Regulator Output. LDO3 can provide a total of 100mA to external loads. If

25

LDO3

VOUT3 is greater than the LDO3 switchover threshold, the LDO3 regulator shuts

down and LDO3 pin connects to VOUT3 through a 1.5Ω switch. Bypass a 4.7μF

 

 

 

 

ceramic capacitor to GND.

26

UGATE3

High Side N-MOSFET Floating Gate-Driver Output for VOUT3. Swings between

PHASE3 and BOOT3.

 

 

27

PHASE3

Inductor Connection for 3.3V SMPS. PHASE3 is the internal lower supply rail for the

UGATE3 high side gate driver, and the current sense input for the 3.3V SMPS.

 

 

28

BOOT3

Boost Capacitor Connection for 3.3V SMPS. Connect an external ceramic capacitor to

PHASE3 and an external diode to LDO5.

 

 

DS8203-05 April 2011

www.richtek.com

 

5

Richtek RT8203GA, RT8203PA Schematic

RT8203

Function Block Diagram

 

 

 

 

VIN

 

 

 

 

 

 

 

 

 

 

 

 

PGOOD

 

 

 

 

 

 

 

 

GND

BOOT3

 

U3

 

 

 

U5

 

BOOT5

UGATE3

Driver

 

 

 

 

 

Driver

UGATE5

PHASE3

 

 

 

 

 

 

 

PHASE5

 

 

L3

VOUT3

 

VOUT5

L5

 

 

LGATE3

Driver

PWM

 

PWM

Driver

LGATE5

 

 

 

Controller

 

Controller

 

 

 

ILIM3

 

 

 

 

 

 

 

ILIM5

FB3

 

 

 

 

 

 

 

FB5

VOUT3

 

 

 

 

 

 

 

VOUT5

 

 

+

 

 

4.65V

+

 

 

 

 

2.93V

 

-

EN5

 

 

EN3

-

 

 

 

LDO

 

 

 

 

 

 

 

 

LDO5

 

 

 

 

 

 

 

(5V)

 

 

 

 

 

 

 

 

LDO3

LDO

 

LDO5

 

 

 

 

 

(3V)

 

 

 

 

 

 

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON3

Power Sequence

Thermal

 

2V

 

ON5

 

VREF

EN

Logic

 

Shutdown

 

Reference

 

 

 

PRO

 

 

 

 

 

 

 

 

VIN

 

 

 

 

 

 

 

 

 

 

 

 

Ton

 

 

 

Ux

 

 

 

 

1-SHOT

 

 

 

VOUTx

 

 

 

R

TRIG

 

 

 

 

Ton

QN

 

 

On-time

 

 

 

 

 

 

 

 

 

QN

 

 

 

Compute

 

 

 

TRIG

 

 

 

Min. Toff

1-SHOT

VREF

+

 

-

 

 

 

 

GM

 

+

 

 

 

 

-

 

 

 

 

 

 

 

Comp

 

 

 

 

 

 

25Khz

 

 

 

 

 

 

Detector

 

 

 

SS

 

 

 

 

Lx

 

(internal)

 

 

 

 

FBx

+

OV

 

 

 

 

-

 

 

 

 

 

PRO

1.1xVREF

 

 

Zero

 

SKIP

 

 

 

-

 

 

 

S1

Detector

 

 

-

UV

 

 

S2 Latch

Q

+

PHASEx

 

+

 

 

 

 

 

 

0.7xVREF

 

 

Current

+

ILIMx

 

-

 

 

Limit -

-

 

 

+

 

 

+

 

 

PGOOD

0.9xVREF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PWM Controller

 

 

www.richtek.com

DS8203-05 April 2011

6

 

 

 

 

 

 

 

 

 

 

 

 

RT8203

Absolute Maximum Ratings (Note 1)

 

 

 

 

z Input Voltage, VIN, EN to GND ------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

−0.3V to 25V

 

z BOOTx to GND -------------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

−0.3V to 30V

 

z PHASEx to BOOTx --------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

−6V to 0.3V

 

z PHASEx to GND ------------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

−1V to 25V

 

z VCC, LDOx, VOUTx, ONx, VREF, FBx,

 

 

 

−0.3V to 6V

 

SKIP,

 

PRO,

---------------------------PGOOD to GND

 

 

z UGATEx to PHASEx ------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

−0.3V to (VBOOTx + 0.3V)

z ILIMx to GND ----------------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

−0.3V to (VCC + 0.3V)

z LGATEx to GND ------------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

−0.3V to (VLDO5 + 0.3V)

z TON toGND ------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

−0.3V to 6V

 

z LDOx, VREF Short Circuit to GND -------------------------------------------------------------------------

 

 

 

 

 

 

Momentary

 

z LDOx Circuit (Internal Regulator) Continuous

-----------------------------------------------------------

 

 

 

 

 

100mA

 

 

z LDOx Circuit (Switchover to VOUTx) Continuous ------------------------------------------------------

 

200mA

 

 

z Power Dissipation, PD @ TA = 25°C

 

 

 

 

 

 

 

 

 

SSOP-28 --------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

1.053W

 

 

z Package Thermal Resistance

(Note 2)

 

 

 

 

 

 

 

 

 

SSOP-28, θJA ----------------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

95°C/W

 

z Junction Temperature ------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

150°C

 

 

z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------

 

 

 

 

 

 

260°C

 

 

z Storage Temperature Range ---------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

–65°C to 150°C

 

z ESD Susceptibility (Note 3)

 

 

 

 

 

 

 

 

 

 

 

 

 

HBM (Human Body Mode) -----------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

2kV

 

 

MM (Machine Mode) -------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

200V

 

 

Recommended Operating Conditions (Note 4)

 

 

 

 

z Input Voltage, VIN -----------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

7V to 24V

 

z Control Voltage, VCC -------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

5V ± 5%

 

z Junction Temperature Range ---------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

10°C to 125°C

 

z Ambient Temperature Range ---------------------------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

10°C to 85°C

 

Electrical Characteristics

 

 

 

 

 

 

 

 

 

(VIN = 12V, No load on LDOx, VOUTx and VREF, ONx = VCC, VEN = 5V, TA = 25°C, unless Otherwise specification)

 

Parameter

 

Symbol

 

 

 

 

Test Conditions

Min

Typ

Max

Unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Main SMPS Controllers

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Voltage Range

 

VIN

LDO5 in regulation

7

--

24

V

VOUT3 Output Voltage in Fixed

 

VOUT3

VIN = 7V to 24V, FB3 = GND,

3.285

3.330

3.375

V

 

 

 

 

 

 

 

Mode

 

VSKIP = 5V

 

 

 

 

 

 

 

 

VOUT5 Output Voltage in Fixed

 

VOUT5

VIN = 8V to 24V, FB5 = GND,

4.975

5.059

5.125

V

Mode

 

V

 

 

= 5V

 

 

 

 

SKIP

 

 

 

 

 

Output Voltage in Adjustable Mode

 

 

 

VIN = 7V to 24V, either SMPS

1.975

2.00

2.025

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Output Voltage Adjust Range

 

 

 

 

Either SMPS

2

--

5.5

V

 

 

 

 

 

 

 

 

 

 

 

 

 

FBx Adjustable-Mode Threshold

 

 

 

Dual-Mode comparator

0.12

--

0.22

V

Voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To be continued

DS8203-05 April 2011

 

 

 

 

 

 

 

 

 

 

 

www.richtek.com

 

 

 

 

 

 

 

 

 

 

 

 

 

7

RT8203

Parameter

Symbol

 

 

 

 

 

 

Test Conditions

Min

Typ

Max

Unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Either SMPS, V

 

 

 

= 5V, 0 to 5A

--

−0.1

--

 

 

 

 

SKIP

 

 

DC Load Regulation

VLOAD

Either SMPS, V

 

 

 

= GND, 0 to 5A

--

−1.5

--

%

 

SKIP

 

 

 

Either SMPS, V

 

= 2V, 0 to 5A

--

−1.7

--

 

 

 

 

SKIP

 

 

Line Regulation

VLINE

Either SMPS, 7V< VIN <24V

---

0.005

--

%/V

Current-Limit Threshold

 

ILIMx = VCC, GND to PHASEx

90

100

110

mV

(Positive, Default)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Current-Limit Threshold

 

VILIMx = 0.5V, GND to PHASEx

40

50

60

 

 

 

VILIMx = 1V, GND to PHASEx

90

100

110

mV

(Positive, Adjustable)

 

 

VILIMx = 2V, GND to PHASEx

185

200

215

 

 

 

 

 

 

Zero-Current Threshold

 

 

 

 

 

= GND, ILIMx = VCC, GND − PHASEx

--

3

--

mV

 

SKIP

Soft-Start Ramp Time

 

Zero to full limit

 

--

1.5

---

ms

 

 

VTON = 5V,

 

5V SMPS

--

200

--

 

 

 

 

V

 

 

= VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.3V SMPS

--

300

--

 

 

 

 

SKIP

 

 

 

Operating Frequency

fOSC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

kHz

VTON = GND

 

5V SMPS

--

400

--

 

 

V

 

= VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SKIP

 

3.3V SMPS

--

500

--

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

= VREF

 

 

 

 

 

 

 

25

--

--

 

 

 

 

SKIP

 

 

 

 

 

 

 

 

 

 

 

VTON = 5V

 

VOUT5 = 5.05V

1.854

2.060

2.265

 

 

On-Time Pulse Width

 

 

VOUT3 = 3.33V

0.821

0.912

1.003

μs

 

 

 

 

 

 

 

 

 

V

= GND

VOUT5 = 5.05V

0.876

1.030

1.184

 

 

 

 

 

 

 

TON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOUT3 = 3.33V

0.467

0.546

0.625

 

 

 

 

 

 

 

 

 

 

 

 

 

Minimum Off-time

tOFF

 

 

 

 

 

 

 

 

 

 

 

 

 

300

400

500

ns

 

 

VTON = 5V

 

VOUT5 = 5.05V

--

92

--

 

 

Maximum Duty Cycle

 

 

VOUT3 = 3.33V

--

88

--

%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VTON = GND

 

VOUT5 = 5.05V

--

84

--

 

 

 

 

 

 

 

 

 

VOUT3 = 3.33V

--

80

--

 

 

 

 

 

 

 

 

 

 

 

 

 

Internal Regulator And Reference Voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LDO5 Output Voltage

 

ONx = GND, 7V < VIN < 24V,

4.90

5.0

5.10

V

 

 

0 < ILDO5 < 100mA

(Note 5)

 

 

 

 

 

LDO5 Short-Circuit Current

 

LDO5 = GND

 

--

350

--

mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC Under-Voltage

 

Falling edge of VCC,

 

3.95

4.25

4.55

V

Lockout Fault Threshold

 

hysteresis = 1%

 

 

 

 

 

 

 

 

LDO5 Bootstrap Switch

 

Falling edge of VOUT5, rising edge at

4.52

4.65

4.78

V

Threshold

 

VOUT5 regulation point

 

 

 

 

 

 

LDO5 Bootstrap Switch

 

LDO5 to VOUT5, VOUT5 = 5V

--

1.4

3.2

Ω

Resistance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LDO3 Output Voltage

 

ONx = GND, 7V < VIN < 24V,

3.28

3.35

3.42

V

 

0 < ILDO3 < 100mA

(Note 5)

 

 

 

 

 

 

 

LDO3 Short-Circuit Current

 

LDO3 = GND

 

--

175

--

mA

LDO3 Bootstrap Switch

 

Falling edge of VOUT3, rising edge at

2.82

2.93

3.04

V

Threshold

 

VOUT3 regulation point

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To be continued

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

www.richtek.com

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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