1 Features
• High-efficiency, 1.5-MHz, synchronous switchmode
buck charger
– 92% charge efficiency at 2-A from 5-V input
– Optimized for USB voltage input (5 V)
• Supports USB On-The-Go (OTG)
– Boost converter with up to 1.2-A output
– 92% boost efficiency at 1-A output
– Accurate constant current (CC) limit
– Soft-start up to 500-μF capacitive load
– Output short circuit protection
• Single input to support USB input and high voltage
adapters
– Support 3.9-V to 13.5-V input voltage range
with 22-V absolute maximum input voltage
rating
– Maximum power tracking by input voltage limit
up to 4.6 V (VINDPM)
– VINDPM threshold automatically tracks battery
voltage
– Auto detect USB SDP, DCP and non-standard
adaptors
• High battery discharge efficiency with 19.5-mΩ
battery discharge MOSFET
• Narrow VDC (NVDC) power path management
– Instant-on works with no battery or deeply
discharged battery
– Ideal diode operation in battery supplement
mode
• High integration includes all MOSFETs, current
sensing and loop compensation
• 58-μA low battery leakage current with system
voltage standby
• High accuracy
– ±0.5% charge voltage regulation
– ±6% at 1.2-A and 1.8-A charge current
regulation
– ±5% at 0.5-A, 1.2-A and 1.8-A input current
regulation
• Safety-Related Certification:
– IEC 62368-1 CB Certification

2 Applications
• EPOS, Portable speakers
• Mobile phone accessory
• Medical equipment

3 Description
The BQ25606 is a highly-integrated standalone 3.0-
A switch-mode battery charge management and
system power path management device for single
cell Li-ion and Li-polymer batteries. The solution
is highly integrated with input reverse-blocking FET
(RBFET, Q1), high-side switching FET (HSFET, Q2),
low-side switching FET (LSFET, Q3), and battery
FET (BATFET, Q4) between system and battery. The
low impedance power path optimizes switch-mode
operation efficiency, reduces battery charging time,
and extends battery life during discharging phase.