Richtek RT5028 Datasheet

®

PMIC for Industrial Application

RT5028

General Description

The RT5028 is a highly-integrated low-power high­performance analog SOC with PMIC in one single chip
designed for Industrial a pplications.

The RT5028 includes four synchronous step-down DC/
DC converters and eight LDOs for syste m power.

The RT5028 also embeds one EEPROM (MTP) for setting
sequence and timing etc.

Additionally, the RT5028 PMIC also includes one IRQ
report.

Applications

 Industrial

Ordering Information

RT5028

Package Type
QW : WQFN-56L 7x7 (W-Type)

Lead Plating System
G : Green (Halogen Free and Pb Free)

Note :
Richtek products are :

 RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

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

Features



Input Voltage Operating Range is 3.3V to 5.5V







 Step-Down Regulator : V





 Max Current 2.4A/2A/1.6A/2A





 Programmable Frequency from 500kHz to 2MHz



2



 I

C Programmable Output Level



2



 I

C Programmable Operation Mode (Force PWM



or Auto PSM/PWM)

2



 I

C Programmable Output Discharge Mode



(Discharge or Flatting)



 Linear Regulators : V





 Max Current 0.3A



2



 I

C Programmable Output Level





 Embedded 32Bytes MTP for Factory T uning





 External MTP Pin for Write Protection





 Sequence can be Controlled by I



Defined by MASK_GPIO pin.



 OT/UVP/VIN LV/POWRON press Time Interrupt



(IRQ).

2



 I

C Control Interface: Support Fast Mode up to



400kb/s



 RoHS Compliant and Halogen Free



Range is 3.3V to 5.5V

IN

Range is 2.5V to 5.5V

IN

2

C or each EN pins

Simplified Application Circuit

VIN
VDDP
VINL123
VINL456

VINL78
LXBx
VOUTBxS

VINBx
ENBx

ENLx

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RT5028

PWRHOLD

REBOOT

MASK_GPIO

AGND

VOUTLx

SCL

SDA

IRQ

RESET

PWRON

MTP

SADDR

1

RT5028

Marking Information

RT5028GQW : Product Number

RT5028
GQW
YMDNN

YMDNN : Date Code

Pin Configurations

(TOP VIEW)

ENL3

ENL2

ENL1

VIN

VDDP

IRQ

VOUTB1S

AGND

AGND

RESET

VOUTL1
VINL123
VOUTL2
VOUTL3
VOUTL6
VOUTL5
VINL456
VOUTL4
VOUTL7

VINL78

VOUTL8

ENL4
ENL5

ENL6

AGND

1
2
3
4
5
6
7
8

9
10
11
12
13
14

SCL

SDA

ENL7

ENL8

ENB1

PWRON

LXB1

LXB1

57

MTP

REBOOT

VINB1

VINB1

454647484950515253545556

44

262524232221201918171615

27

PWRHOLD

MASK_GPIO

VINB2

43

28

SADDR

VINB2

42
41
40
39
38
37
36
35
34
33
32
31
30
29

ENB4

LXB2
LXB2
ENB2
VOUTB2S
VINB3
VINB3
LXB3
LXB3
AGND
VOUTB3S
VINB4
LXB4
ENB3
VOUTB4S

Functional Pin Description

Pin No. Pin Name Pin Function

1 VOUTL1 Output Voltage Regulation Node for LDO1.
2 VINL123 Input Power f or LDO1, LDO2 and LDO3.
3 VOUTL2 Output Voltage Regulation Node for LDO2.
4 VOUTL3 Output Voltage Regulation Node for LDO3.
5 VOUTL6 Output Voltage Regulation Node for LDO6.
6 VOUTL5 Output Voltage Regulation Node for LDO5.
7 VINL456 Input Power f or LDO4, LDO5 and LDO6.
8 VOUTL4 Output Voltage Regulation Node for LDO4.

9 VOUTL7 Output Voltage Regulation Node for LDO7.
10 VINL78 Input Power for LDO7 and LDO8.
11 VOUTL8 Output Voltage Regulation Node for LDO8.
12 ENL4 Enable Control Input for LDO4. Connect a 100k pull-low resistor.

WQFN-56L 7x7

13 ENL5 Enable Control Input for LDO5. Connect a 100k pull-low resistor.
14 ENL6 Enable Control Input for LDO6. Connect a 100k pull-low resistor.
15 SCL Clock Input for I2C. Open-drain output, connect a 10k pull-up resistor.

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Pin No. Pin Name Pin Function

16 SDA

Data Input for I

2

C. Open-drain output, c onnec t a 10k pull-up resistor.
17 ENL7 Enabl e Control Input for LDO7. Connect a 100k pull-low resistor.
18 ENL8 Enabl e Control Input for LDO8. Connect a 100k pull-low resistor.
19 IRQ Open-Drain IRQ Output Node.

RT5028

20

21, 34, 56, 57

(Exposed Pad)

RESET
AGND

Reset Output.
Analog Ground. The exposed pad must be soldered to a large PCB and

connected to AGND for maximum power dissipation.

22 PWRON Manual Power On. Connect a 100k pull - up resistor.
23 REBOOT System Power Reboot. Connec t a 100k pull-low resistor.

24 MTP

25 MASK_GPIO

MTP Write Protection Pin. Connect a 100k pull-low resistor, logic low is
inhibit ed and logic high is permit to write.

Select I

2

C or use EN pin for Bucks and LDOs. Connect a 100k pull-low resistor.
As MASK_GPIO is high, ignor e all E N pins.
As MASK_GPIO is low, EN pins and I

2

higher than I

C.

2

C both can control. EN pins priority is

26 PWRHOL D Power Hold Input. Connec t a 100k p ull -low resistor.
27 SADDR I2C Slave Address. Connect a 100k pull-low resistor.

28 ENB4 Enable Control Input for Buck4. Connect a 100k pull -low resi stor.
29 VOUTB4S Output Voltage Regulation Node for Buck4.
30 ENB3 Enable Control Input for Buck3. Connect a 100k pull -low resist or.
31 LXB4 Internal Switc h Node to Output Inductor Connecti on for Buck4.
32 VINB4 Input Power for Buck 4.

33 VOUTB3S Output Voltage Regulation Node for Buck3.
35, 36 LXB3 Internal Switch Node t o Output Inductor Connection for Buc k 3.
37, 38 VINB3 I nput Power for Buck3.

39 VOUTB2S Output Voltage Regulation Node for Buck2.

40 ENB2 Enable Control Input for Buck2. Connect a 100k pull -low resi stor.
41, 42 LXB2 Internal Switch Node t o Output Inductor Connection for Buc k 2.
43, 44 VINB2 I nput Power for Buck2.
45, 46 VINB1 I nput Power for Buck1.
47, 48 LXB1 Internal Switch Node t o Output Inductor Connection for Buc k 1.

49 ENB1 Enable Control Input for Buck1. Connect a 100k pull -low resi stor.

50 VOUTB1S Output Voltage Regulation Node for Buck1

51 VDDP Internal Bi as Regulator Voltage. Exter nal load on this pin is not allowed.

52 VIN Input Power for Analog B ase.

53 ENL1 Enabl e Control Input for LDO1. Connect a 100k pull-low resistor.

54 ENL2 Enabl e Control Input for LDO2. Connect a 100k pull-low resistor.

55 ENL3 Enabl e Control Input for LDO3. Connect a 100k pull-low resistor.

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3

RT5028

Function Block Diagram

VOUTL1
VINL123

VOUTL2

VOUTL3
VOUTL4

VINL456

VOUTL5
VOUTL6

VOUTL7

VINL78

VOUTL8

SDA

SCL

IRQ

RESET

PWRHOLD

REBOOT

MTP

MASK_GPIO

SADDR

PWRON

ENB1 to ENB4

ENL1 to ENL8

AGND

LDO1

300mA

LDO2

300mA

LDO3

300mA

LDO4

300mA

LDO5

300mA

LDO6

300mA

LDO7

300mA

LDO8

300mA

State

Machine

Central

Controller

2

C

I

Programmable

Analog

Base

Buck1

2.4A

Buck2

2A

Buck3

1.6A

Buck4

2A

GND

GND

GND

GND

VIN
VDDP

VINB1

LXB1

VOUTB1S

VINB2

LXB2

VOUTB2S
VINB3

LXB3

VOUTB3S

VINB4

LXB4

VOUTB4S

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4

Operation

RT5028

The RT5028 is a highly-integrated solution for industrial
system including 4-CH step-down DC/DC converters a nd
8-CH LDOs. The RT5028 a pplication mecha nism will be
introduced in later sections.

The power-on and power-off sequences ca n be controlled
by I2C or each EN pin and detected in MASK_GPIO pin.
When the MASK_GPIO pin is at Hi level, the PMIC follows
the power-on sequence to turn on channels. When the
MASK_GPIO pin is at Lo level, the channels of PMIC will
be controlled by the EN pin.

Synchronous Step-Down DC/DC Converter

Four current mode synchronous step-down DC/DC
converters operate with internal power MOSFETs, FB
resistors and compensation network. These cha nnels are
suitable for core power in industrial system. They ca n be
operated at 100% maximum duty cycle to extend battery
operating voltage range. When the input voltage is close
to the output voltage, the converter enters low dropout
mode with low output ripple. The operating frequency of
step-down converter is adjustable from 500kHz to 2MHz
and is controlled by I2C. Besides, the I2C interface also
can be used to select different operation mode s, On/Off
Sequence, programmable the output voltage, RAMP
control and discharge function. To enable AUTO Mode, it
is used to improve the efficiency at light load. If the AUTO
Mode is disabled, the converter operates in force PWM
mode with fixed switching frequency .

Over-Temperature Protection

An Over-T emperature Protection (OTP) is contained in the
device. The protection is triggered to force the device
shutdown for protecting itself when the junction
temperature exceeds 165°C typically. Once the junction
temperature drops below the hysteresis 10°C typically,
the device must be re-send PWRON to start system.

Output Under-Voltage Protection

The output under-voltage protection is implemented in order
to prevent operation at low output voltage conditions.
When the step-down DC/DC converters output voltage is
lower than 1/2 x (V
turns off immediately.

), the UVP event triggers and PMIC

OUT

Linear Regulator

Eight generic low voltage LDOs for multiple purpose power .
The LDOs are stable over the entire operating load ra nge
with the use of external ceramic capacitors. The LDOs
also have I2C programm able power on/off sequence a nd
discharge function. The output voltage is adjustable by
the I2C interface in the ra nge of 1.6V to 3.6V.

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5

RT5028

Absolute Maximum Ratings (Note 1)

 Analog Ba se Input Voltage, VIN ---------------------------------------------------------------------------------------- −0.3V to 6V
 PMIC Input V oltage, VINL123/456/78, VINB1/2/3/4 ---------------------------------------------------------------- −0.3V to 6V
 PMIC Output V oltage, VOUTLx, VOUTBxS, LXBx----------------------------------------------------------------- −0.3V to 6V
 PMIC related Other Pins-------------------------------------------------------------------------------------------------- −0.3V to 6V
 Power Dissipation, P

WQFN-56L 7x7 ------------------------------------------------------------------------------------------------------------- 3.7W

 Package Thermal Re sistance (Note 2)

WQF N-56L 7x7, θJA-------------------------------------------------------------------------------------------------------- 27°C/W
WQFN-56L 7x7, θJC------------------------------------------------------------------------------------------------------- 7°C/W

 Junction T emperature------------------------------------------------------------------------------------------------------ 150°C
 Lead T e mperature (Soldering, 10 sec.)-------------------------------------------------------------------------------- 260°C
 Storage T emperature Range --------------------------------------------------------------------------------------------- −65°C to 150°C
 ESD Susceptibility (Note 3)

HBM (Human Body Model)----------------------------------------------------------------------------------------------- 2kV
MM (Machine Model) ------------------------------------------------------------------------------------------------------ 200V

@ T

D

= 25°C

A

Recommended Operating Conditions (Note 4)

 Junction T emperature Range--------------------------------------------------------------------------------------------- − 40°C to 125°C
 Ambient T emperature Range--------------------------------------------------------------------------------------------- − 40°C to 85°C

Electrical Characteristics

(VIN = 3.3V to 5.5V, TA = −40°C to 85°C, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

As f

> 1MHz, 3.3V  VIN  5.5 V.

Operation Voltage of VIN

PMIC

Quiescent Curr ent IIN

Warning for Die
Temperature

Over-Temperature
Protection

OTP and Warning
Hysteresis

OTW

OTP -- 165 -- C

-- 10 -- C

SW

 1MHz, VIN  4V.

If f

SW

VIN = 5V, LDOs, Bucks are ON with No Load. 300 450 600 A

= 5V, LDOs, Bucks are OFF.

V

IN

SCL = SDA = 0V
Temperature 1 -- 100 -­Temperature 2 -- 125 --

3.3 -- 5.5 V

5 20 40 A

C

Input Pull-low 100k Resistor R

VIN = 5V, Temperature = 40C to 125C 70 115 160 k

Low

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RT5028

t

Parameter Symbol Test Conditions Min Typ Max Unit

Buck1 to Buck4

Input Voltage V

Output Voltage V

Consumption
Current

INB

OUTB

I

VINB

Effi ciency Peak Eff

Output Voltage
Accuracy

Output Voltage
Ripple

V

OUTAcc

V

Rip

Output Voltage
Temperature
Coefficien
Switching
Frequency

Switching
Frequency Accuracy

-- ±100 -- ppm/C

f

SW

3.3 -- 5.5 V
Buck1 I

2

C Programmable per step 25mV
Buck2 I2C Programmable per step 25mV
Buck3 I2C Programmable per step 50mV
Buck4 I2C Programmable per step 50mV

AUTO Mode I

V

= 1.2V, V

OUT

3.6V

3.1V < V
1mA < I

I

OUT

I

OUT

I

2

C Pr ogr amma ble 0. 43 - - 2 M H z

1MHz  f

IN

OUT

= 1m A , C
= 1A , C

SW

< 5.5V,

= 0mA, Each Buck 10 20 40 A

OUT

I

= CCM -- 88 --

LOAD

=

IN

I

= 1mA -- 80 --

LOAD

As VOUTB1S to VOUTB4 S  1V. 3 -- 3

< I

MAX

As VOUTB1S to VOUTB4S < 1V. 30 -- 30

= 10F, 2MHz -- 25 --

OUT

= 10F, 2MHz -- 8 --

OUT

10 -- 10

0.7 -- 1.8

0.7 -- 1.8
V

0.7 -- 3.6

0.7 -- 3.6

%

%mV

mV

%

fSW  1MHz 20 -- 20

S ugg est Induc t or L

Buck

Peak Current Limit OCP

Under-Voltage
Protection

Maximum Output
Current

Out put Transient
Response

High-Side
On-Resistance
Low-Side
On-Resistance

UVP VOUTB1S to VOUTB4S < 0.66 x (V

I

MAX

V

peak

R

pon

R

non

-- 2.2 -- H
Buck1 3.1 4.4 5.8
Buck2 2.8 4 5.2

A

Buck3 2.6 3.7 4.8
Buck4 2.8 4.1 5.3

Target) 56 66 76 %

OUT

Buck1 2.4 -- -­Buck2 2 -- --

A

Buck3 1.6 -- -­Buck4 2.0 -- --

0.8A to 1.6A at 20s, V
Buck1 and Buck2

OUT

= 1.2V

4 -- 4 %

VIN = 3.7V 50 150 250 m

VIN = 3.7V 40 110 160 m

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7

RT5028

Parameter Symbol Test Conditions Min Typ Max Unit

LDO1 to LDO8

Input Voltage for
VINL123/456/78

Output Voltage LDO123/78 V

Output Voltage LDO456 V
Output Current I

2.5 -- 5.5 V

V

INL

3.1V  VIN  5.5V, 50A  I

OUTL

3.1V  V

OUTL

300 -- -- mA

OUT

 5. 5V, 50A  I

IN

OUT

OUT

 I

 I

3%

MAX

3%

MAX

1.6 to

3.6

3 to

3.6

3% V

3% V

Output Short Current Isht 330 450 600 mA

> 3.1V

V



V

Voltage Difference

Output Voltage Temperature
Coefficient

IN

V

OUT

-- ±100 -- ppm/C

Supply Current ISS I
Shutdown Current I

0 1 2 A

OFF

IN

VIN > 2.5V 0. 05 0. 11 0.5

= 0mA 10 35 60 A

OUT

V

IN

= V

SET

, I

OUT

= I

OUTMAX

0.05 0.1 0.3
V

Line Regulation Input 3V to 5V, load = 100mA 0 1 5 mV
Load Regulation V
T ra n sien t R espo n s e V

OUT

Ri pp le R eje cti on f = 1 0 kHz, I
Ri si ng Tim e V
Falling Time V

= 5V, Load 100mA to 300mA 0 0.1 1 %

IN

50A  I

 0.7 x V

OUT

 0.3 x V

OUT

OUTMAX

/ 2 (⊿t = 1s) -- 50 -- mV

OUT

= I

Target
Target

OUTMAX

/ 2 -- 60 -- dB

, I

= 0mA 150 220 300 s

OUT

, I

= 0mA 300 600 1000 s

OUT

I2C Interface Elect rical Charac teristics

Voltage Output Low VOL -- -- 0.4 V

Input Voltage

High-Level V

1.5 -- --

IH

V

Low-Level VIL -- -- 0.4

SCL Clock SCL -- -- 400 kHz

Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are

stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.

Note 2. θ

Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.

is measured at T

JA

measured at the exposed pad of the package.

= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is

A

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Typical Application Circuit

RT5028

22µF

22µF

22µF

22µF

10µF

10µF

10µF

10µF

2.2µH

2.2µH

2.2µH

2.2µH

1µF

1µF

1µF

1µF

1µF

52

10

45, 46

47, 48

50

43, 44

41, 42

39

37, 38

35, 36

33

32

31
29

VIN

51

VDDP

2

VINL123

7

VINL456

VINL78

VINB1

LXB1
VOUTB1S

VINB2

LXB2
VOUTB2S

VINB3

LXB3
VOUTB3S

VINB4

LXB4
VOUTB4S

RT5028

PWRHOLD

MASK_GPIO

ENL1 to ENL8

ENB1 to ENB4

VOUTL1

VOUTL2

VOUTL3

VOUTL4

VOUTL5

VOUTL6

VOUTL7

VOUTL8

SCL

SDA

IRQ

RESET

REBOOT

MTP

SADDR

PWRON

AGND

1µF

1

1µF

3

1µF

4

1µF

8

1µF

6

1µF

5

1µF

9

1µF

11

15
16

19
20
26

23
24

25
27

22

21, 34, 56,
57 (Exposed Pad)

AP

VIN

SADDR
MASK_GPIOMTP

AGND

As SADDR connect to AGND
slave address
=0111111
As SADDR connect to VIN
slave address
=0110111

As MASK_GPIO connect to AGND
EN pins can control.
As MASK_GPIO connect to VIN
Ignore all EN pins.

As MTP connect to AGND
Inhibit to write MTP.
As MTP connect to VIN
Permit to write MTP.

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9

RT5028

Typical Operating Characteristics

CH1 Buck Efficiency vs. Output Current

100

90
80
70
60
50
40

Effici ency (%)

30
20
10

0

VIN = 3.3V

VIN = 3.6V

VIN = 3.9V

VIN = 4.2V

VIN = 5V

VIN = 5.5V

V

= 1.35V, L = 2.2μH, C

OUT

10 100 1000 10000

OUT

Output Current (mA)

CH3 Buck Efficiency vs. Output Current

100

90
80
70
60
50
40

Effici ency (%)

30
20
10

0

VIN = 3.3V

VIN = 3.6V

VIN = 3.9V

VIN = 4.2V

VIN = 5V

VIN = 5.5V

V

= 1.2V, L = 2.2μH, C

OUT

10 100 1000 10000

OUT

Output Current (mA)

= 10μF

= 10μF

CH2 Buck Efficiency vs. Output Current

100

90
80
70
60
50
40

Efficiency (%)

30
20
10

0

VIN = 3.3V

VIN = 3.6V

VIN = 3.9V

VIN = 4.2V

VIN = 5V

VIN = 5.5V

V

= 1.5V, L = 2.2μH, C

OUT

10 100 1000 10000

OUT

Output Current (mA)

CH4 Buck Efficiency vs. Output Current

100

90
80
70
60
50
40

Eff iciency (%)

30
20
10

0

10 100 1000 10000

VIN = 3.6V

VIN = 3.9V

VIN = 4.2V

VIN = 4.5V

VIN = 5V

VIN = 5.5V

V

OUT

Output Current (mA)

= 3.3V, L = 2.2μH, C

OUT

= 10μF

= 10μF

CH1 Buck Output Voltage vs. Output Current

1.39

1.38

1.37

1.36

1.35

1.34

Output Voltage (V)

1.33

1.32
0 300 600 900 1200 1500 1800 2100 2400

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VIN = 3.3V

VIN = 3.6V

VIN = 3.9V

VIN = 4.2V

VIN = 5V

VIN = 5.5V

L = 2.2μH, C

Output Current (mA)

OUT

= 10μF

CH2 Buck Output Voltage vs. Outpu t Current

1.53

1.52

1.51

1.50

1.49

Output Voltage (V)

1.48

1.47
0 500 1000 1500 2000

VIN = 3.3V

VIN = 3.6V

VIN = 3.9V

VIN = 4.2V

VIN = 5V

VIN = 5.5V

L = 2.2μH, C

Output Current (A)

OUT

DS5028-01 January 2015www.richtek.com

10

= 10μF

RT5028

CH3 Buck Output Voltage vs. Output Current

1.25

1.24

1.23

1.22

1.21

1.20

Output Voltage (V)

1.19

1.18

1.17
0 200 400 600 800 1000 1200 1400 1600

VIN = 3.3V

VIN = 3.6V

VIN = 3.9V

VIN = 4.2V

VIN = 5V

VIN = 5.5V

L = 2.2μH, C

OUT

= 10μF

Output Current (mA)

CH1 Buck Output Voltage vs. Input Voltage

1.40

1.39

1.38

1.37

1.36

1.35

1.34

1.33

Output Voltage (V)

1.32

1.31

1.30

3.3 3.8 4.3 4.8 5.3 5.8

I

= 0mA

OUT

I

= 500mA

OUT

I

= 1000mA

OUT

I

= 1500mA

OUT

I

= 2000mA

OUT

I

= 2400mA

OUT

Input Voltage (V)

L = 2.2μH, C

OUT

= 10μF

CH4 Buck Output Voltage vs. Output Current

3.38

VIN = 3.6V

3.33

VIN = 3.9V

VIN = 4.2V

VIN = 4.5V

3.28

3.23

3.18

VIN = 5V

VIN = 5.5V

Output Voltage (V)

3.13

3.08

L = 2.2μH, C

0 500 1000 1500 2000

OUT

= 10μF

Output Current (mA)

CH2 Buck Output Voltage vs. Input Voltage

1.55

1.53

1.51

Output V oltage (V)

1.49

1.47

1.45

I

= 0mA

OUT

I

= 500mA

OUT

I

= 1000mA

OUT

I

= 1500mA

OUT

I

= 2000mA

OUT

3.3 3.8 4.3 4.8 5.3 5.8

L = 2.2μH, C

OUT

= 10μF

Inpu t Voltage (V)

CH3 Buck Output Voltage vs. Input Voltage

1.24

1.23

1.22

1.21

1.20

1.19

1.18

1.17

Output Volt age (V)

1.16

1.15

1.14

3.3 3.8 4.3 4.8 5.3 5.8

Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.

©

I

= 0mA

OUT

I

= 500mA

OUT

I

= 1000mA

OUT

I

= 1600mA

OUT

Input Vol tage (V)

L = 2.2μH, C

OUT

= 10μF

CH4 Buck Output Voltage vs. Input Voltage

3.80

3.60

3.40

3.20

3.00

2.80

Output Voltage (V)

2.60

2.40

3.3 3.8 4.3 4.8 5.3 5.8

I

= 0mA

OUT

I

= 500mA

OUT

I

= 1000mA

OUT

I

= 1500mA

OUT

I

= 2000mA

OUT

Inp ut Voltage (V)

L = 2.2μH, C

OUT

= 10μF

DS5028-01 January 2015 www.richtek.com

11

RT5028

Output Volt age (V)

Output Voltage (V)

LDO2 Output Voltage vs. Output Current

1.790

1.785

1.780

1.775

1.770

1.765

1.760

1.755

1.750
0 50 100 150 200 250 300

VIN = 2.5V

VIN = 3V

VIN = 3.6V

VIN = 4.2V

VIN = 5V

VIN = 5.5V

Output Current (mA)

LDO7 Output Voltage vs. Output Current

2.52

2.50

2.48

2.46

2.44

2.42

2.40
0 50 100 150 200 250 300

VIN = 2.5V

VIN = 3V

VIN = 3.6V

VIN = 4.2V

VIN = 5V

VIN = 5.5V

Output Current (mA)

LDO5 Output Voltage vs. Output Current

3.32

3.30

3.28

3.26

VIN = 3.3V

VIN = 3.6V

VIN = 3.9V

3.24

Output Voltage (V)

3.22

C

= 1μF

OUT

3.20
0 50 100 150 200 250 300

VIN = 4.2V

VIN = 5V

VIN = 5.5V

C

= 1μF

OUT

Output Current (mA)

LDO2 Output Voltage vs. Input Voltage

1.78

1.78

I

= 0mA

OUT

1.77

1.77

1.76

Output Voltage (V)

1.76

C

= 1μF

OUT

1.75

2.5 3 3.5 4 4.5 5 5.5

I

= 100mA

OUT

I

= 200mA

OUT

I

= 300mA

OUT

Input Voltage (V)

C

= 1μF

OUT

LDO5 Out put Volt age vs. Input Volt age

3.50

3.45

3.40

3.35

3.30

3.25

3.20

3.15

Output Voltage (V)

3.10

3.05

3.00

3.3 3.8 4.3 4.8 5.3 5.8

Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.

©

I

= 0mA

OUT

I

= 100mA

OUT

I

= 200mA

OUT

I

= 300mA

OUT

Inp ut Voltage (V)

Output Voltage (V)

C

= 1μF

OUT

LDO7 Output Voltage vs. Input Voltage

2.50

2.48

2.46

2.44

2.42

2.40

2.5 3 3.5 4 4.5 5 5.5

I

= 0mA

OUT

I

= 100mA

OUT

I

= 200mA

OUT

I

= 300mA

OUT

Input Voltage (V)

C

OUT

DS5028-01 January 2015www.richtek.com

12

= 1μF