iW1797
AC/DC Primary-Side DLNK Rapid ChargeTM 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 PrimAccurateTM 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, 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 and other proprietary protocols.
Qualcomm® Quick ChargeTM 2.0 and 3.0 are products of QualcommTechnologies, Inc.
2 Features
■ Supports 45W or up application circuit designs
■ No audible noise over entire operating range
■ Supports 10mV DLNK voltage step requests required
by USB PD programmable power supply (PPS) or
other proprietary rapid charge protocols
■ 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:
■ RC charging VCC technology enables ultra-low no-
load power of <75mW with ample margin at 230VAC
and 5V output voltage setting
□ Output voltage request
□ Output current limit
□ <20mW achievable (at 230VAC/5VOUT) with an
external active startup circuit
□ Output voltage undershoot detection for fast
■ High VCC pin voltage rating eliminates external VCC
dynamic load response
LDO
□ Over-voltage protection
■ Tight multi-level constant-voltage and multi-level
constant-current regulation with primary-side feedback ■ EZ-EMITM design enhances manufacturability
and control
■ Built-in single-point fault protections against output
■ Proprietary optimized load adaptive maximum
constant frequency PWM switching with quasi-
resonant operation achieves best size, efficiency, and
common mode noise
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
■ Backward compatible with QC2.0/3.0 and other
proprietary rapid charge protocols with secondary-side
interface circuits
■ Over-temperature protection with internal OTP control
■ Multi-mode PWM/PFM control improves efficiency at
various load conditions
10-Feb-2022
Product Summary
Rev. 1.2
www.renesas.com
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