ROHM BD9533EKN Technical data

High-performance Regulator IC Series for PCs

Switching Regulators for DDR-SDRAM Cores

BD9533EKN

●Description BD9533EKN is a switching regulator controller with high output current which can achieve low output voltage (0.7V to 2.0V)

TECHNICAL NOTE

from a wide input voltage range (4.5V to 28V). High efficiency for the switching regulator can be realized by utilizing an external N-MOSFET power transistor. A new technology called H ultra high transient response against load change. SLLM (Simple Light Load Mode) technology is also integrated to improve efficiency in light load mode, providing high efficiency over a wide load range. For protection and ease of use, the soft start function, variable frequency function, short circuit protection function with timer latch, over voltage protection function and REF synchronous function are all built in. This switching regulator is specially designed for the DDR-SDRAM core.

●Features

●Applications

3

1) H

2) Light Load Mode and Continuous Mode Changeable

3) Thermal Shut Down (TSD), Under Voltage LockOut (UVLO), Over Current Protection (OCP), Over Voltage Protection (OVP), Short Circuit Protection (SCP) built-in

4) Soft start function to minimize rush current during startup

5) Switching Frequency Variable (f=200KHz～600KHz)

6) HQFN20V Package

Laptop PC, Desktop PC, LCD-TV, Digital Components

RegTM Switching Regulator Controller

3

RegTM is a Rohm proprietary control method to realize

Sep. 2008

●Maximum Absolute Ratings (Ta=25℃)

*

1

*

1

*

1

*

1

*

1

*

1

*

1

*

2

*

3

*

4

*

5

r

Parameter Symbol Limit Unit Input Voltage 1 VCC 7 Input Voltage 2 VDD 7 Input Voltage 3 VIN 30 BOOT Voltage BOOT 35 BOOT-SW Voltage BOOT-SW 7 HG-SW Voltage HG-SW 7

V V V V V

V LG Voltage LG VDD V REF Voltage REF VCC V Output Voltage VOUT/Is+/Is- VCC V ILIM/SCP/SS/FS/SLLM Voltage ILIM/SCP/SS/FS/SLLM VCC V VREG Voltage VREG VCC V EN Input Voltage EN 7 Power Dissipation 1 Pd1 0.5 Power Dissipation 2 Pd2 0.75 Power Dissipation 3 Pd3 1.75 Power Dissipation 4 Pd4 2.00 Operating Temperature Range Top

-10～+100 ℃

V

W W W W

Storage Temperature Range Tstg -55～+150 ℃ Maximum Junction Temperature Tjmax +150 ℃

*1 Not to exceed Pd. *2 Reduced by 4mW for each increase in Ta of 1℃ over 25℃ (when don’t mounted on a heat radiation board ) *3 Reduced by 6mW for increase in Ta of 1℃ over 25℃. (when mounted on a board 70.0mm×70mm×1.6mm Glass-epoxy PCB.) *4 Reduced by 14mW for increase in Ta of 1℃ over 25℃. (when mounted on a board 70.0mm×70mm×1.6mm Glass-epoxy PCB.) *5 Reduced by 16mW for increase in Ta of 1℃ over 25℃. (when mounted on a board 70.0mm×70mm×1.6mm Glass-epoxy PCB.)

●Operating Conditions (Ta=25℃)

Paramete

Symbol MIN MAX Unit Input Voltage 1 VCC 4.5 5.5 V Input Voltage 2 VDD 4.5 5.5 V Input Voltage 3 VIN 4.5 28 V BOOT Voltage BOOT 4.5 33 V SW Voltage SW -0.7 28 V BOOT-SW Voltage BOOT-SW 4.5 5.5 V SLLM Input Voltage SLLM 0 5.5 V EN Input Voltage EN 0 5.5 V Output setting voltage REF 0.7 2.0 V Is Input Voltage Is+/Is- 0.7 2.7 V MIN ON Time Tonmin - 200 nsec

★ This product should not be used in a radioactive environment.

2/20

●ELECTRICAL CHARACTERISTICS (unless otherwise noted, Ta=25℃ VCC=5V,VDD=5V,EN/SLLM=5V,VIN=12V,REF=1.8V,R

Parameter Symbol

Standard Value

MIN TYP MAX

=68kΩ)

FS

Unit Condition

[Whole Device] VCC Bias Current Icc - 700 900 μA VIN Bias Current Iin - 100 200 μA VCC Standby Current Iccstb - 0 10 μA EN=0V VIN Standby Current Iinstb - 100 200 μA EN=0V EN Low Voltage Enlow GND - 0.8 V EN HighVoltage Enhigh 2.3 - 5.5 V EN Bias Current Ien - 7 10 μA

VREG Voltage Vreg 2.475 2.500 2.525 V

Ireg=100μA Ta =- 10 ℃ to 100℃*

[Under Voltage Locked Out ] VCC threshold voltage Vcc_UVLO 4.1 4.3 4.5 V VCC:Sweep up VCC hysteresis voltage dVcc_UVLO 100 160 220 mV VCC:Sweep down VIN threshold voltage Vin_UVLO 4.1 4.3 4.5 V VIN:Sweep up VIN hysteresis voltage dVin_UVLO 100 160 220 mV VIN:Sweep down VREG threshold voltage Vreg_UVLO 2.0 2.2 2.4 V VREG:Sweep up VREG hysteresis voltage dVreg_UVLO 100 160 220 mV VREG:Sweep down [H3RegTM] Frequency Fosc - 300 - kHz ON Time Ton 400 500 600 nsec MAX ON Time Tonmax - 3 - μsec MIN OFF Time Toffmin - 450 550 nsec [FET Driver] HG Higher side ON resistor HGhon - 3.0 6.0 Ω HG Lower side ON resistor HGlon - 2.0 4.0 Ω LG Higher side ON resistor LGhon - 2.0 4.0 Ω LG Lower side ON resistor LGlon - 0.5 1.0 Ω [Dead Time] HG rising HGdead - 50 - nsec LG rising LGdead - 50 - nsec [SCP] SCP Detect Voltage Vscp

REF×0.65 REF×0.7 REF×0.75

V SCP threshold voltage Vscpth 1.2 1.25 1.3 V Charge current Iscp 1.5 2 2.5 μA Standby voltage Vscp_stb - - 50 mV [OVP] OVP Detect Voltage VOVP

REF×1.16 REF×1.2 REF×1.24

V [Soft start] Charge current Iss 1.5 2 2.5 μA Standby voltage Vss_stb - - 50 mV [Over Current Protection Block]

Current limit threshold1 Ilim1 43 50 57 mV

ILIM=0.5V Ta =- 10 ℃ to 100℃*

Current limit threshold2 Ilim2 160 200 240 mV ILIM=2.0V Reverse current limit threshold1 ReIlim1 - -50 - mV ILIM=0.5V Reverse current limit threshold2 ReIlim2 - -200 - mV ILIM=2.0V [VOUT setting ] VOUT offset voltage1 Voutoff1 REF-7m REF REF+7m V Ta=-10℃ to 100℃* VOUT bias current Ivout -100 0 100 nA REF bias current Iref -100 0 100 nA Is+ Input current IIs+ -1 0 1 μA Is+=1.8V Is- Input current IIs- -1 0 1 μA Is-=1.8V [SLLM ] Continuous mode threshold Vthcon VCC-0.5 - VCC V SLLM threshold VthSLLM GND - 0.5 V

* Design Guarantee

3/20

●Reference Data

]

600

590

580

Icc(uA)

570

560

550

-1010 30507090 Ta(℃)

Fig.1 Ta vs Icc Fig.3 Ta vs UVLO (VCC)

2.500

2.498

2.496

2.494

VREG[V

2.492

2.490

-101030507090 Ta(℃)

Fig.2 Ta vs VREG

4.30

4.25

4.20

4.15

VCC[V]

4.10

4.05

4.00

-101030507090 Ta(℃)

4.30

4.25

4.20

4.15

VIN[V]

4.10

4.05

Sweep up

Sweep down

4.00

-1010 30507090

Fig.4 Ta vs UVLO (VIN) Fig.5 Ta vs UVLO (VREG) Fig.6 Ta vs EN Threshold

Ta(℃)

2.20

2.15

2.10

2.05

VREG[V]

2.00

1.95

1.90

-101030507090

Sweep up

Sweep down

Ta(℃)

1.7

1.6

1.5

EN[V]

1.4

1.3

1.2

-10103050 7090 Ta(

2.8

2.4

2.0

1.6

1.2

VREG(V)

0.8

0.4

0.0

0 1.5 3 4.5 6

CC vs VREG (Start up)

Fig.7 V

Right: -10℃

Middle: 25℃

Vcc(V)

400

350

300

250

200

TON [nsec]

150

100

50

0

0.6 0.8 1 1.2 1.4 1.6 1.8 2

Fig.10 REF-ON TIME

(V

Bottom: 100℃

REF [V]

IN=25V)

Left: 100℃

Top: -10℃

Middle: 25℃

1000

900

800

700

600

500

400

TON [nsec]

300

200

100

0

0.6 0.8 1 1.2 1.4 1.6 1.8 2

Top: -10℃

Middle: 25℃

Bottom: 100℃

REF [V]

Fig.8 REF vs ON TIME

IN=7V)

(V

1200

1000

800

600

TON [nsec]

400

200

0

5 10152025

Top: -10℃

Middle: 25℃

Bottom: 100℃

VIN [V]

Fig.11 VIN-ON TIME

(REF=1.8V)

600

500

400

300

TON [nsec]

200

100

0

0.6 0.8 1 1.2 1.4 1.6 1.8 2

REF [V]

Fig.9 REF vs ON TIME

IN=12V)

(V

3

2

1

0

-1

VOUT-REF [mV]

-2

-3

-101030507090

Ta [℃]

Fig.12 Ta vs VOUT offset

Sweep up

Sweep down

Sweep up

Sweep down

)

℃

Top: -10℃

Middle: 25℃

Bottom: 100℃

4/20

●Reference Data

54

52

50

Is [mV]

⊿

48

46

-101030507090

Fig.13 Ta vs current limit

threshould

Te [

]

℃

ILIM=0.5V

100

SLLM

80

60

[%]

η

40

Continuous mode

20

0

1 10 100 1000 10000

Fig.16 Io vs Efficiency

Io(mA)

(V

IN=7V)

VOUT

HG/LG

IOUT

Fig.19 Load Transient

Response (V

IN=7V)

VOUT

HG/LG

IOUT

Fig.22 Load Transient

Response (V

IN=7V)

350

330

310

290

frequency[kHz]

270

250

-10 10 30 50 70 90 Ta(℃)

400

360

320

280

frequency[kHz]

240

200

0 5 10 15 20 25

Io=2A

Io=0A

VIN(V)

Fig.14 Ta vs Frequency Fig.15 VIN vs Frequency

100

SLLM

80

60

[%]

η

40

20

0

1 10 100 1000 10000

Continuous mode

Io(mA)

Fig.17 Io vs Efficiency

(V

IN=12V)

VOUT

HG/LG

IOUT

Fig.20 Load Transient Response

(VIN=12V)

VOUT

HG/LG

IOUT

Fig.23 Load Transient Response

IN=12V)

(V

100

[%]

η

80

60

40

20

SLLM

Continuous mode

0

1 10 100 1000 10000

Io(mA)

Fig.18 Io vs Efficiency

(V

IN=20V)

VOUT

HG/LG

IOUT

Fig.21 Load Transient

Response (V

VOUT

HG/LG

IOUT

IN=19V)

Fig.24 Load Transient

Response (V

IN=19V)

5/20

●Reference Data

HG/LG

IL

HG/LG/SW

VIN

HG/LG

VOUT

1.82

1.81

1.8

VOUT [V]

1.79

1.78

VOUT

IL

Fig.25 SLLM

(I

OUT=0A)

Fig.28 Continuous MODE

(Io=0A)

Fig.31 VIN change

(5→19V)

Continuous

mode

SLLM

1 10 100 1000 10000

Iout [mA]

Fig.34 I

OUT-VOUT Fig.35 IOUT-Frequency Fig.36 FS resistance- Frequency

IL

HG/LG/SW

VIN

HG/LG

VOUT

IL

HG/LG

Fig.26 SLLM

(I

OUT=0.4A)

Fig.29 Continuous MODE

(Io=4A)

Fig.32 VIN change

(19→5V)

400

Continuous

350

300

250

200

150

Frequency [kHz]

100

50

0

mode

SLLM

1 10 100 1000 10000

Iout [mA]

IL

HG/LG/SW

EN

SS

VOUT

IL

HG/LG

Fig.27 SLLM

(I

OUT=1A)

Fig.30 Continuous MODE

(Io=5A)

Fig.33 FS VIN wake up

700

600

500

400

300

Frequency [kHz]

200

100

From upper side VIN=5V

30 40 50 60 70 80 90 100 110 120 130

RFS [kΩ]

7V 12V 16V 19V

6/20

●Block Diagram

2

VIN VCC

5

VREG

19 16

SS

VOUT

EN

SCP

REF

4

7

20

18

Reference

Block

REF×0.7

SS×0.7

VOUT

Thermal

Protection

SS

TSD

VREG

VIN

SCP

UVLO

ILIM SCP TSD

+ +

UVLO

SCP

H3RegTM

Controller

Block

2.5VReg

REF×1.2

VOUT

R

S

ILIM

2.5V

Q

Current Limit

Soft Start Block

OVP

SLLM

-

+

Driver

Circuit

SS

BOOT

HG

SW

VDD

LG

PGND

EN/UVLO

15

14

13

12

11

10

VDD

1

GND FS

17

6

SLLM

3 9

ILIM

Is+

8

Is-

●PHYSICAL DIMENSIONS ●Pin Number・Pin Name

BD9533

1PIN MARK

Lot No.

※ Mounting is not recommended to the dotted line part.

(UNIT：mm)

HQFN20V

Pin No.

Pin Name

1 GND 2 VCC 3 ILIM 4 EN 5 VIN 6 SLLM 7 SCP 8 IS-

9 IS+ 10 PGND 11 LG 12 VDD 13 SW 14 HG 15 BOOT 16 SS 17 FS 18 VOUT 19 VREG 20 REF

- FIN

Please short FIN to the 1PIN

VIN

VOUT

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