iW1797
AC/DC Primary-Side DLNK Rapid Charge
TM
Controller
with High Performance Voltage/Current Control
1 Description
The iW1797 is a high performance AC/DC power supply controller for rapid charge applications that supports high
resolution voltage/current control. The device can support high power applications with power ratings of 45W or up
and it can support 10mV voltage step requests. It uses Dialog’s
PrimAccurate
TM
technology to minimize external
component count and simplify system design. The device operates in quasi-resonant mode to provide high efficiency
and it also provides a number of key built-in protection features. The iW1797 can achieve tight multi-level constant
voltage and multi-level constant current regulation without a traditional secondary feedback circuit. It also eliminates
the need for loop compensation components while maintaining stability over all operating conditions.
The iW1797 is optimized to work with Dialog’s secondary-side controllers that use the proprietary digital link (DLNK)
technology. The iW1797 and DLNK-based secondary-side controller chipset together can implement various rapid
charge protocols, such as USB Power Delivery (USB PD), Qualcomm
®
Quick Charge™ 2.0 and 3.0 (QC2.0 and QC3.0)
technologies and Huawei Fast Charge (FCP) technology, etc. to achieve fast and smooth voltage transitions upon
request by mobile devices (MD). The iW1797 and compatible secondary-side controller from Dialog use the DLNK
communction protocol for output voltage requests, output current limits, output voltage undershoot and over voltage
information from the secondary to the primary.
The iW1797 can provide no-load power consumption for a typical 5V output setting of less than 75mW with ample margin.
The no-load power consumption can be reduced to less than 20mW with an optional, external active start-up DFET.
Dialog’s innovative proprietary technology ensures that power supplies designed with the iW1797 and Dialog’s secondary-side
controllers can provide output voltage configurations of 3.3V to 21V for USB PD, 5V/9V/12V for QC2.0 and 3.6V to 12V in
200mV increments for QC3.0, 5V/9V for Huawei FCP and other proprietary protocols.
Qualcomm
®
Quick Charge
TM
2.0 and 3.0 are products of QualcommTechnologies, Inc.
2 Features
■
Supports 45W or up application circuit designs
■
Supports 10mV DLNK voltage step requests required
by USB PD programmable power supply (PPS) or
other proprietary rapid charge protocols
■
RC charging V
CC
technology enables ultra-low no-load
power of <75mW with ample margin at 230V
AC
and 5V
output voltage setting
□
<20mW achievable (at 230V
AC
/5V
OUT
) with an
external active startup circuit
■
High V
CC
pin voltage rating eliminates external V
CC
LDO
■
Tight multi-level constant-voltage and multi-level
constant-current regulation with primary-side feedback
and control
■
Proprietary optimized load adaptive maximum
constant frequency PWM switching with quasi-
resonant operation achieves best size, efficiency, and
common mode noise
■
Backward compatible with QC2.0/3.0, Huawei FCP
and other proprietary rapid charge protocols with
secondary-side interface circuits
■ Multi-mode PWM/PFM control improves efficiency at
various load conditions
Product Summary
www.dialog-semiconductor.com
■
No audible noise over entire operating range
■ User-configurable 4-level cable drop compensation
independent of output voltage
■
Proprietary secondary-to-primary digital
communication with single optocoupler for all the
rapid charge information:
□
Output voltage request
□
Output current limit
□
Output voltage undershoot detection for fast
dynamic load response
□
Over-voltage protection
■
EZ-EMI
®
design enhances manufacturability
■
Built-in single-point fault protections against output
short-circuit including soft short and half short, output
over-voltage, and output over-current
■
Advanced fault control technology addresses issues
of soft shorts in cables and connectors by effectively
reducing the average output power at fault conditions
without latch
■
Over-temperature protection with internal OTP control
27-Dec-2018
© 2018 Dialog Semiconductor
Rev. 0.3 Preliminary
1 of 6
iW1797
AC/DC Primary-Side DLNK Rapid Charge
TM
Controller
with High Performance Voltage/Current Control
3 Applications
■
Rapid-charging AC/DC adapters for smart phones,
tablets and other portable devices.
L
+
N
+
+
+
V
BUS
-
U3
iW676
1
2
3
GND
DRAIN
SOURCE
OUT
V
IN
6
V
CC
5
GND
4
+
U1
iW1797
1
2
3
V
CC
V
SENSE
DLNK
GATE
6
GND
5
CS/CDC
4
U2
iW657P
1
2
3
4
5
6
7
DIS
DRV
V
CC
DET
V
BUS
V
BUS_G
CC2
D+
GND
D-
SD
IS+
IS-
CC1
14
13
12
11
10
9
8
D+
D-
CC1
CC2
USB Type-C
Socket
Figure 3.1 : iW1797 Typical Application Circuit for USB PD
(Using iW657P as Secondary-Side Controller for USB PD and iW676 as Synchronous Rectifier Controller.)
Product Summary
www.dialog-semiconductor.com
Rev. 0.3 Preliminary
2 of 6
27-Dec-2018
© 2018 Dialog Semiconductor
iW1797
AC/DC Primary-Side DLNK Rapid Charge
TM
Controller
with High Performance Voltage/Current Control
4 Pinout Description
iW1797
1
2
3
V
CC
V
SENSE
DLNK
GATE
GND
CS/CDS
6
5
4
Figure 4.1 : 6-Lead SOT23-6 Package
Pin Number
1
2
Pin Name
V
CC
V
SENSE
Type
Power Input
Analog Input
Pin Description
IC power supply.
Auxiliary voltage sense. Used for primary-side regulation.
Digital communication link signal. Used for secondary-side to primary- side
communication for all rapid charge information, which includes output voltage
requests, output current limits, output voltage undershoot, and over-voltage
protection.
Primary-side current sense. Used for cycle-by-cycle peak-current control and
limit in primary-side CV/CC regulation. During configuration stage, used to
configure the CDC compensation level.
Ground.
Gate drive for external MOSFET switch.
3
DLNK
Analog Output
4
5
6
CS/CDC
GND
GATE
Analog Input
Ground
Output
Product Summary
www.dialog-semiconductor.com
Rev. 0.3 Preliminary
3 of 6
27-Dec-2018
© 2018 Dialog Semiconductor
iW1797
AC/DC Primary-Side DLNK Rapid Charge
TM
Controller
with High Performance Voltage/Current Control
5 Absolute Maximum Ratings
Absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. For
maximum safe operating conditions, refer to the Electrical Characteristics section.
Parameter
DC supply voltage range (pin 1, I
CC
= 20mA max)
Continuous DC supply current at V
CC
pin (V
CC
= 15V)
V
SENSE
input (pin 2, I
Vsense
≤ 10mA)
DLNK (pin 3)
CS/CDC (pin 4)
GATE (pin 6)
Maximum junction temperature
Operating junction temperature
Storage temperature
Thermal resistance junction-to-ambient
ESD rating per JEDEC JS-001-2017
Latch-up test per JESD78E
Note 1.
T
JMAX
T
JOPT
T
STG
θ
JA
Symbol
V
CC
I
CC
Value
-0.3 to 45.0
20
-0.7 to 10.0
-0.7 to 5.0
-0.7 to 5.0
-0.3 to 30
150
-40 to 150
-65 to 150
208
±2,000
±100
Units
V
mA
V
V
V
V
°C
°C
°C
°C/W
V
mA
Stresses beyond those listed under “Absolute maximum ratings” may cause permanent damage to the device. These are
stress ratings only, so functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specification are not implied. Exposure to absolute maximum rating conditions for extended periods
may affect device reliability.
Product Summary
www.dialog-semiconductor.com
Rev. 0.3 Preliminary
4 of 6
27-Dec-2018
© 2018 Dialog Semiconductor
iW1797
AC/DC Primary-Side DLNK Rapid Charge
TM
Controller
with High Performance Voltage/Current Control
6 Physical Dimensions
Figure 6.1 : SOT23-6 package outline drawing
7 Ordering Information
Options
Part
Number
Protocol
Supported
Direct
Charge
Default
k
CC
at
Start-up
0.422
CC Shutdown
Voltage
2.9V for V
BUS
≤ 12V,
3.2V for V
BUS
> 12V
OVP/
OTP
Latch
No
CC
Shutdown
Latch
No
Supported DLNK
Voltage Information
Resolution
10mV/Step up to 21V
Package
Description
iW1797-05
SOT23-6
Tape & Reel
1
Note 1:
Tape & Reel packing quantity is 3,000/reel. Minimum packing quantity is 3,000.
Product Summary
www.dialog-semiconductor.com
Rev. 0.3 Preliminary
5 of 6
27-Dec-2018
© 2018 Dialog Semiconductor
