Richtek RT8243AZQW, RT8243BZQW, RT8243CZQW Schematic [ru]
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®
RT8243A/B/C
High Efficiency, Main Power Supply Controller for Notebook Computers
General Description
The RT8243A/B/C is a dual step down, Switch Mode Power Supply (SMPS) controller which generates logic supply voltages for battery powered systems. It includes two Pulse Width Modulation (PWM) controllers adjustable from 2V to 5.5V and also two fixed 5V/3.3V linear regulators. One of the controllers (LDO5) provides automatic switch over to the BYP1 input connected to the main SMPS1 output for maximized efficiency. An optional external charge pump can be monitored through SECFB (RT8243B/C). Other features include on board power up sequencing, a power good output, internal softstart, and a soft discharge output that prevents negative voltage during shutdown.
A constant on-time PWM control scheme operates without sense resistors and assures fast load transient response while maintaining nearly constant switching frequency. To eliminate noise in audio applications, an ultrasonic mode is included, which maintains the switching frequency above 25kHz. Moreover, a diode emulation mode maximizes efficiency for light load applications. The SMPS1/SMPS2 switching frequency can be adjustable from 200kHz/233kHz to 400kHz/466kHz respectively.
The RT8243A/B/C is available in a WQFN-20L 3x3 package, and operates over an extended temperature range from −40°C to 85°C.
Features
5.5V to 25V Input Voltage Range
2V to 5.5V Output Voltage Range
No Current Sense Resistor Needed
5V/3.3V Linear Regulators
4700ppm/°C RDS(ON) Current Sensing
Internal Current Limit Soft-Start and Soft Discharge Output
Built In OVP/UVP/OCP
Selectable Operation Mode with Switcher Enable Control (RT8243A)
SECFB Input Maintains Charge Pump Voltage (RT8243B/C)
Power Good Indicator (RT8243B/C includes SECFB)
RoHS Compliant and Halogen Free
Applications
Notebook computers
System Power Supplies
3- and 4- Cell Li+ Battery-Powered Device
Ordering Information
RT8243A/B/C
Package Type
QW : WQFN-20L 3x3 (W-Type)
Lead Plating System
Z : ECO (Ecological Element with Halogen Free and Pb free)
Pin Function With A : ENM
B : SECFB
C : SECFB, Ultrasonic Mode
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.
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8243A/B/C-07 November 2014 |
www.richtek.com |
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1 |
RT8243A/B/C
Pin Configurations
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BYP1 BOOT1 UGATE1 PHASE1 LGATE1 |
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20 19 |
18 17 |
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16 |
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FB1 |
1 |
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15 |
LDO3 |
ENTRIP1 |
2 |
GND |
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14 |
LDO5 |
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TON |
3 |
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13 |
ENM |
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ENTRIP2 |
4 |
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21 |
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12 |
ENLDO |
FB2 |
5 |
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11 |
VIN |
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6 |
7 |
8 |
9 |
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10 |
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PGOOD |
BOOT2 |
UGATE2 |
PHASE2 |
LGATE2 |
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RT8243A |
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Marking Information
RT8243AZQW
8A : Product Code
8A YM YMDNN : Date Code
DNN
RT8243CZQW
0B : Product Code
0B YM YMDNN : Date Code
DNN
(TOP VIEW)
WQFN-20L 3x3
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BYP1 BOOT1 UGATE1 PHASE1 LGATE1 |
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20 19 |
18 17 |
16 |
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FB1 |
1 |
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15 |
LDO3 |
ENTRIP1 |
2 |
GND |
14 |
LDO5 |
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TON |
3 |
13 |
SECFB |
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ENTRIP2 |
4 |
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21 |
12 |
ENLDO |
FB2 |
5 |
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11 |
VIN |
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6 |
7 |
8 |
9 |
10 |
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PGOOD |
BOOT2 |
UGATE2 |
PHASE2 |
LGATE2 |
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RT8243B/C |
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RT8243BZQW
7A : Product Code
7A YM YMDNN : Date Code
DNN
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
www.richtek.com |
DS8243A/B/C-07 November 2014 |
2 |
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RT8243A/B/C
Typical Application Circuit
VIN 5.5V to 25V
V |
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OUT1 |
+ |
5V |
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C3 |
C5
Optional 
C1
10µF
N1 
L1
N2 
R3 15k
R4 10k
R1
C2 
0.1µF
R2
C4 
0.1µF
RTON
11
12
18
19
17
16
1
3
20
Chip Enable |
13 |
21 (Exposed Pad)
RT8243A |
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VIN |
UGATE2 |
8 |
ENLDO |
BOOT2 |
7 |
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UGATE1 |
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BOOT1 |
PHASE2 |
9 |
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10 |
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LGATE2 |
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PHASE1 |
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LGATE1 |
FB2 |
5 |
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ENTRIP2 |
4 |
FB1 |
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2 |
TON |
ENTRIP1 |
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15 |
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BYP1 |
LDO3 |
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ENM |
LDO5 |
14 |
GND |
PGOOD |
6 |
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C6 |
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N3 |
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10µF |
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R5 |
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C7 |
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L2 |
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0.1µF |
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V |
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+ |
OUT2 |
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3.3V |
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N4 |
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C8 |
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R6 |
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6.5k |
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R8 |
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R7 |
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100k |
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10k |
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R9 |
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100k |
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C9 |
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3.3V Always On |
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4.7µF |
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C10 |
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5V Always On |
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R10 |
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4.7µF |
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100k |
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Figure 1. RT8243ANB Main Supply Typical Application Circuit
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8243A/B/C-07 November 2014 |
www.richtek.com |
|
3 |
RT8243A/B/C
VIN 5.5V to 25V
C1 
10µF
N1 
V |
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L1 |
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OUT1 |
+ |
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5V |
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C3 |
N2 |
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R3 |
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15k |
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R4 |
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10k |
C5 |
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Optional |
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C13 |
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0.1µF |
C14 0.1µF
C15
VCP
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R1 |
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RT8243B/C |
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VIN |
UGATE2 |
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C2 |
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12 |
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0.1µF |
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ENLDO |
BOOT2 |
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18 |
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UGATE1 |
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R2 |
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19 |
BOOT1 |
PHASE2 |
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C4 |
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LGATE2 |
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0.1µF |
17 |
PHASE1 |
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16 |
LGATE1 |
FB2 |
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1 |
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ENTRIP2 |
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FB1 |
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RTON |
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3 |
TON |
ENTRIP1 |
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20 |
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BYP1 |
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C11 |
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0.1µF |
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LDO3 |
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C12 |
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LDO5 |
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0.1µF |
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R11 |
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PGOOD |
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200k |
13 |
SECFB |
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R12 |
GND |
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39k |
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8
7
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10
5
N3
R5
C7 
0.1µF
N4
C6
10µF
L2
+
C8
R6 6.5k
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R8 |
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R7 |
4 |
100k |
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10k |
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R9 |
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2 |
100k |
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On |
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Off |
15 |
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3.3V Always On |
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C9 |
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4.7µF |
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14 |
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C10 |
5V Always On |
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R10 |
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4.7µF |
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100k |
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6 |
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21 (Exposed Pad)
VOUT2 3.3V
Figure 2. RT8243B/C NB Main Supply Typical Application Circuit
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
www.richtek.com |
DS8243A/B/C-07 November 2014 |
4 |
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RT8243A/B/C
Functional Pin Description
Pin No. |
Pin Name |
Pin Function |
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1 |
FB1 |
SMPS1 Feedback Input. Connect FB1 to a resistive voltage divider from SMPS1 |
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output to GND for adjustable output from 2V to 5.5V. |
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Channel 1 Enable and Current Limit Setting Input. Connect resistor to GND to set |
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2 |
ENTRIP1 |
the threshold for Channel 1 synchronous RDS(ON) sense. The GND-PHASE1 |
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current limit threshold is 1/10th the voltage seen at ENTRIP1 over a 0.5V to 3V |
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range. There is an internal 10 A current source from LDO5 to ENTRIP1. Leave |
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ENTRIP1 floating or drive it above 4.5V to shut down channel 1. |
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3 |
TON |
ON-Time/Frequency Adjustment Input. Connect to GND with 56k to 100k . |
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Channel 2 Enable and Current Limit Setting Input. Connect resistor to GND to set |
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4 |
ENTRIP2 |
the threshold for Channel 2 synchronous RDS(ON) sense. The GND-PHASE2 |
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current limit threshold is 1/10th the voltage seen at ENTRIP2 over a 0.5V to 3V |
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range. There is an internal 10 A current source from LDO5 to ENTRIP2. Leave |
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ENTRIP2 floating or drive it above 4.5V to shut down channel 2. |
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5 |
FB2 |
SMPS2 Feedback Input. Connect FB2 to a resistive voltage divider from SMPS2 |
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output to GND for adjustable output from 2V to 5.5V. |
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6 |
PGOOD |
Power Good Output for Channel 1 and Channel 2 (RT8243A). |
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Power Good Output for Channel 1, Channel 2 and SECFB (RT8243B/C). |
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7 |
BOOT2 |
Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor |
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according to the typical application circuits. |
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8 |
UGATE2 |
Upper Gate Driver Output for SMPS2. UGATE2 swings between PHASE2 and |
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BOOT2. |
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9 |
PHASE2 |
Switch Node for SMPS2. PHASE2 is the internal lower supply rail for the UGATE2 |
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high side gate driver. PHASE2 is also the current sense input for the SMPS2. |
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10 |
LGATE2 |
Lower Gate Drive Output for SMSP2. LGATE2 swings between GND and LDO5. |
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11 |
VIN |
Supply Input for LDO5. |
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Master Enable Input. LDO5/LDO3 is enabled if it is within logic high level and |
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12 |
ENLDO |
disabled if it is less than the logic low level. Leave ENLDO floating to default |
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enable LDO5/LDO3. |
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ENM |
Mode Selection with Enable Input. Pull up to LDO5 (Ultrasonic mode) or LDO3 |
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(RT8243A) |
(DEM) to turn on both switch Channels. Short to GND for shutdown. |
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Change Pump Feedback Pin. The SECFB is used to monitor the optional external |
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13 |
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charge pump. Connect a resistive divider from the change pump output to GND to |
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SECFB |
detect the output. If SECFB drops below its feedback threshold, an ultrasonic |
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pulse occurs to refresh the charge pump driven by LGATE1 or LGATE2. |
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(RT8243B/C) |
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If SECFB drops below its UV threshold, the switcher channels stop working and |
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enter into discharge-mode. Pull up to LDO5 or LDO3 to disable SECFB UVP |
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function. |
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5V Linear Regulator Output. LDO5 is the supply voltage for the low side MOSFET |
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14 |
LDO5 |
driver and also the analog supply voltage for the device. Bypass a minimum 4.7 F |
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ceramic capacitor to GND |
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15 |
LDO3 |
3.3V Linear Regulator Output. Bypass a minimum 4.7 F ceramic capacitor to |
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GND. |
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Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8243A/B/C-07 November 2014 |
www.richtek.com |
|
5 |
RT8243A/B/C
Pin No. |
Pin Name |
Pin Function |
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16 |
LGATE1 |
Lower Gate Driver Output for SMPS1. LGATE1 swings between GND and |
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LDO5. |
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17 |
PHASE1 |
Switch Node SMPS1. PHASE1 is the internal lower supply rail for the UGATE1 |
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high side gate driver. PHASE1 is also the current sense input for the SMPS1. |
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18 |
UGATE1 |
Upper Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and |
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BOOT1. |
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19 |
BOOT1 |
Boost Flying Capacitor Connection for SMPS1. Connect to an external |
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capacitor according to the typical application circuits. |
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20 |
BYP1 |
Switch Over Source Voltage Input for LDO5. |
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21 (Exposed Pad) |
GND |
Analog Ground and Power Ground. The exposed pad must be soldered to a |
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large PCB and connected to GND for maximum power dissipation. |
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Function Block Diagram
BOOT1 |
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UGATE1 |
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PHASE1 |
LDO5 |
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LDO5 |
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SMPS1 |
SMPS2 |
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LGATE1 |
PWM |
PWM |
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Buck |
Buck |
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Controller |
Controller |
LDO5 |
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LDO5 |
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10µA |
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10µA |
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FB1 |
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ENTRIP1 |
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TON |
On Time |
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BYP1 |
Switch Over Threshold |
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+ - |
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LDO5 |
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LDO5 |
REF |
LDO3 |
VIN |
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Power On |
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Sequence |
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ENLDO |
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Clear Fault Latch |
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BOOT2
UGATE2
PHASE2
LGATE2
FB2
ENTRIP2
ENM (RT8243A) SECFB (RT8243B/C)
PGOOD
GND
LDO3
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
www.richtek.com |
DS8243A/B/C-07 November 2014 |
6 |
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RT8243A/B/C |
Absolute Maximum Ratings (Note 1) |
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VIN, ENLDO to GND ------------------------------------------------------------------------------------------------------ |
−0.3V to 30V |
BOOTx to PHASEx |
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DC ----------------------------------------------------------------------------------------------------------------------------- |
−0.3V to 6V |
< 20ns ----------------------------------------------------------------------------------------------------------------------- |
−2.5V to 6.3V |
ENTRIPx, FBx, TON, BYP1, PGOOD, LDO5, LDO3, ENM/SECFB to GND ------------------------------- |
−0.3V to 6V |
PHASEx to GND |
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DC ----------------------------------------------------------------------------------------------------------------------------- |
−0.3V to 30V |
< 20ns ----------------------------------------------------------------------------------------------------------------------- |
−8V to 38V |
UGATEx to PHASEx |
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DC ----------------------------------------------------------------------------------------------------------------------------- |
−0.3V to 6V |
< 20ns ----------------------------------------------------------------------------------------------------------------------- |
−5V to 7.5V |
LGATEx to GND |
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DC ----------------------------------------------------------------------------------------------------------------------------- |
−0.3V to 6V |
< 20ns ----------------------------------------------------------------------------------------------------------------------- |
−2.5V to 7.5V |
Power Dissipation, PD @ TA = 25°C |
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WQFN-20L 3x3 ------------------------------------------------------------------------------------------------------------ |
3.33W |
Package Thermal Resistance (Note 2) |
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WQFN-20L 3x3, θJA ------------------------------------------------------------------------------------------------------- |
30°C/W |
WQFN-20L 3x3, θJC ------------------------------------------------------------------------------------------------------ |
7.5°C/W |
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- |
260°C |
Junction Temperature ----------------------------------------------------------------------------------------------------- |
150°C |
Storage Temperature Range -------------------------------------------------------------------------------------------- |
−65°C to 150°C |
ESD Susceptibility (Note 3) |
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HBM (Human Body Model) ---------------------------------------------------------------------------------------------- |
2kV |
Recommended Operating Conditions (Note 4) |
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Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------- |
5.5V to 25V |
Junction Temperature Range -------------------------------------------------------------------------------------------- |
−40°C to 125°C |
Ambient Temperature Range -------------------------------------------------------------------------------------------- |
−40°C to 85°C |
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8243A/B/C-07 November 2014 |
www.richtek.com |
|
7 |
RT8243A/B/C
Electrical Characteristics
(VIN = 12V, VENLDO = 5V, VENTRIPx = 2V, VBYP1 = 5V, No Load on LDO5, LDO3, TA = 25°C, unless otherwise specified)
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
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Input Supply |
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VIN Power On Reset |
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Rising Threshold |
-- |
5.1 |
5.5 |
V |
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Falling Threshold |
3.5 |
-- |
4.5 |
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VIN Shutdown Current |
IVIN_SHDN |
VENLDO = GND |
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-- |
20 |
40 |
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A |
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VIN Standby Supply |
IVIN_SBY |
Both SMPS Off |
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-- |
250 |
350 |
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Current |
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Quiescent Power |
IQ |
Both SMPSs on, FBx = 2.1V, |
-- |
5 |
7 |
mW |
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Consumption |
BYP1 = 5V, ENM = 3.3V (RT8243A) |
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SMPS Output and FB Voltage |
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FBx Regulation Voltage |
VFBx |
FBx, CCM Operation |
-- |
2 |
-- |
V |
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FBx, DEM Operation |
1.98 |
2.006 |
2.03 |
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Output Voltage |
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SMPS1, SMPS2 |
2 |
-- |
5.5 |
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Adjustable Range |
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V |
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SECFB Voltage |
VSECFB |
RT8243B |
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1.92 |
2 |
2.08 |
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On Time |
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ON-Time Pulse Width |
tUGATEx |
VIN = 20V |
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VPHASE1 = 2V |
-- |
256 |
-- |
ns |
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RTON = 56k |
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VPHASE2 = 2V |
-- |
220 |
-- |
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Minimum Off-Time |
tLGATEx |
VFBx = 1.8V |
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-- |
-- |
400 |
ns |
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Frequency Range |
fSMPS1 |
SMPS1 Operating Frequency |
200 |
-- |
400 |
kHz |
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fSMPS2 |
SMPS2 Operating Frequency |
233 |
-- |
466 |
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Ultrasonic Mode |
fASM |
RT8243C, VPHASEx = 50mV |
25 |
-- |
-- |
kHz |
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Frequency |
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Soft-Start |
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Soft-Start Time |
tSSx |
Zero to 200mV Current Limit Threshold |
-- |
2 |
-- |
ms |
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from ENTRIPx Enable |
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Current Sense |
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Current Limit Current |
IENTRIPx |
VENTRIPx = 0.9V |
9.4 |
10 |
10.6 |
A |
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Source |
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Temperature Coefficient |
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On The Basis of 25 C |
-- |
4700 |
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ppm/ C |
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of IENTRIPx |
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Current Limit Adjustment |
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VENTRIPx = IENTRIPx x RENTRIPx |
0.5 |
-- |
2.7 |
V |
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Range |
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Current Limit Threshold |
VENTRIPx |
GND PHASEx, VENTRIPx = 2V |
180 |
200 |
225 |
mV |
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Zero-Current Threshold |
VZC |
GND PHASEx, FBx = 2.1V |
-- |
3 |
-- |
mV |
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Internal Regulator and Reference |
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VBYP1 = 0V, ILDO5 < 100mA |
4.9 |
5 |
5.1 |
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LDO5 Output Voltage |
VLDO5 |
VBYP1 = 0V, ILDO5 < 100mA , |
4.75 |
-- |
5.25 |
V |
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6.5V < VIN < 25V |
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VBYP1 = 0V, ILDO5 < 50mA, |
4.75 |
-- |
5.25 |
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5.5V < VIN < 25V |
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Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
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www.richtek.com |
DS8243A/B/C-07 November 2014 |
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