My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX8568BETE
- Part No.:
- MAX8568BETE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX8568BETE.pdf
- Description:
- IC BATT MGMT BACKUP
- Quantity:
- Payment:
- Shipping:
Inventory:6,359
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX8568BETE from Maxim Integrated is a backup-battery-management IC designed for switchover control and dual-chemistry charging in smart portable devices. It supports NiMH and rechargeable lithium backup batteries, delivers 3.3V/2.5V step-up output (BKSU), provides a fixed 1.8V LDO output (LDO), and operates across –40°C to +85°C in a 3mm × 3mm thin QFN package.
For engineers reviewing the MAX8568BETE datasheet, MAX8568BETE pinout, MAX8568BETE application, or MAX8568BETE equivalent, key selection criteria include its dual-chemistry charge algorithm, 17µA quiescent current in backup mode, 1.8V LDO preset (distinguishing it from MAX8568AETE), and integrated boost converter with programmable BKSU voltage.
Technical Context
The MAX8568BETE integrates three functional blocks: a multichemistry charger with separate NiMH fast/trickle thresholds (VBK(NILO)/VBK(NIHI)) and lithium voltage regulation (VBK(LIMAX) = 3.5 × VTERMV); a synchronous-rectified boost converter enabling 1-cell NiMH step-up to 2.5V/3.3V; and a low-quiescent-current LDO powered from BKSU and preset to 1.8V.
Switchover is triggered by an on-chip voltage detector monitoring INOK, initiating backup mode when VINOK falls below 2.43V (typ). At that point, the boost converter activates within 50µs, OD1/OD2 go high-impedance to disconnect main supplies, and the 1.8V LDO powers memory rails - all while drawing only 17µA from BKSU.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LDO Output Voltage | Fixed 1.8V (MAX8568B variant), ±5% accuracy over temperature - powers low-voltage RAM without external feedback. |
| BKSU Output Voltage | Programmable 2.5V or 3.3V (via BKV pin connection), ±5% accuracy - supplies I/O rails during main power loss. |
| Backup Quiescent Current | 17µA into BKSU (typ), 25µA (max) - minimizes drain on single-cell NiMH backup batteries during extended shelf life. |
| Charge Current Range | 8–12mA (typ), set by CHGI-to-GND resistor (50–1800kΩ) - supports fast-charge and 10%-current trickle for NiMH. |
| INOK Threshold | 2.43V (typ) falling threshold - initiates switchover before main battery drops below 2.8V system minimum. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade portable electronics including PDAs and smartphones. |
| Package | 16-pin 3mm × 3mm thin QFN (T1633-4), exposed paddle - enables compact layout and thermal dissipation in space-constrained handhelds. |
Pinout & Package
MAX8568BETE is housed in a 16-pin 3mm × 3mm thin QFN package (T1633-4) with exposed paddle (EP) connected to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Main battery input | Accepts 2.8V–5.5V primary supply; powers charger and internal circuitry when active. |
| BK | Backup battery input | Connects to NiMH or Li-ion cell; feeds boost converter and charger; reverse leakage <0.1µA at 85°C. |
| BKSU | Boost converter output | Delivers regulated 2.5V/3.3V (or adjustable) to I/O rails; bypassed with 10–22µF ceramic capacitor to PGND. |
| LDO | Low-dropout regulator output | Fixed 1.8V, 10mA-capable output for memory/RAM; powered from BKSU; 5µA operating current. |
| NI/LI | Chemistry select input | Logic-high (to BKSU) enables NiMH mode; logic-low (to GND) enables lithium mode - configures charge algorithm. |
| CHGI | Charge current programming | Resistor-to-GND sets fast-charge current (8–12mA typ); trickle current = 10% of fast-charge value in NiMH mode. |
| INOK | Main supply monitor | Resistor-divider input; falling edge at 2.43V triggers switchover, disables charger, and enables boost/LDO. |
| OD1 / OD2 | Open-drain MOSFET drivers | 11Ω on-resistance; drive external pMOS gates to isolate main I/O and memory supplies during backup mode. |
| TERMV / STRTV | NiMH charge termination/start | TERMV sets VBK(NIHI) = 1.163×VTERMV and VBK(NIMAX) = 1.493×VTERMV; STRTV sets VBK(NILO) = VSTRTV. |
| BKV | BKSU feedback | Connect to GND → 3.3V; to BKSU → 2.5V; to resistor divider → adjustable output - no external resistors needed for standard voltages. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-chemistry charging | On-chip algorithms for NiMH (fast/trickle with voltage hysteresis) and lithium (constant-current/constant-voltage) eliminate external state machines. |
| Synchronous boost converter | Integrated synchronous rectifier reduces conduction loss and eliminates external diode - improves efficiency and simplifies BOM. |
| Two independent backup rails | 3.3V/2.5V BKSU output + fixed 1.8V LDO output - powers both I/O and low-voltage memory simultaneously without external regulators. |
| Ultra-low backup IQ | 17µA quiescent current into BKSU (typ) - extends single-cell NiMH backup runtime during long-term storage or infrequent use. |
| Automatic switchover control | Hardware-based INOK detection, OD1/OD2 drive, and seamless timing (50µs boost enable) remove software dependency and ensure deterministic failover. |
Applications
| Smartphone Memory Backup | PDA Real-Time Clock (RTC) |
|---|---|
Use Scenario: Maintaining SRAM and RTC operation during main battery removal or deep discharge in consumer smartphones. IC Role / Device Role / Timing Role: MAX8568BETE acts as backup power manager - charging the NiMH cell during normal operation and delivering 1.8V (LDO) to RAM and 3.3V (BKSU) to RTC upon main supply loss. Use Value: Enables zero-data-loss memory retention and accurate timekeeping using a single low-cost NiMH cell, with no external LDO or boost controller required. | Use Scenario: Preserving RTC functionality and configuration registers in PDAs during battery swaps or AC adapter disconnection. IC Role / Device Role / Timing Role: MAX8568BETE monitors main supply via INOK, switches to backup mode within 50µs, and supplies stable 3.3V (BKSU) to RTC IC and 1.8V (LDO) to associated logic. Use Value: Eliminates need for discrete switchover MOSFETs and dual regulators - reduces PCB area by >30% versus discrete solutions while guaranteeing sub-100µs switchover. |
| Digital Still Camera (DSC) Settings Retention | Wireless Handheld Configuration Storage |
Use Scenario: Retaining user settings, lens calibration data, and firmware state in DSCs after main power-off or battery replacement. IC Role / Device Role / Timing Role: MAX8568BETE charges a lithium backup cell during camera operation and delivers regulated 3.3V (BKSU) to microcontroller nonvolatile registers and 1.8V (LDO) to sensor interface logic during standby. Use Value: Supports lithium chemistry for higher energy density and longer backup duration (>72 hours), with factory-programmed 1.8V LDO eliminating trimming resistors. | Use Scenario: Securing wireless MAC address, network credentials, and calibration tables in industrial handheld scanners during field battery changes. IC Role / Device Role / Timing Role: MAX8568BETE manages NiMH backup charging and provides isolated 3.3V (BKSU) and 1.8V (LDO) outputs to prevent cross-rail interference during RF transmission bursts. Use Value: Dual-rail isolation and <0.1µA reverse leakage from BK to IN ensure zero corruption of stored credentials - critical for secure IoT deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar backup-management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8568AETE | LDO preset to 2.5V (not 1.8V); identical pinout, package, and BKSU functionality. | Used where memory rail requires 2.5V instead of 1.8V; not suitable for 1.8V-only RAM interfaces. | Select MAX8568AETE only if system memory operates at 2.5V - otherwise MAX8568BETE's 1.8V LDO avoids level-shifting overhead. |
| TPS65217C | Integrated PMIC with buck converters, LDOs, and fuel gauge; no dedicated NiMH charge algorithm or BK switchover logic. | Targets full-system power management in tablets; lacks optimized low-IQ backup path and dual-chemistry charge control. | Choose TPS65217C only when consolidating multiple rails is prioritized over ultra-low backup IQ and battery-specific charge safety. |
Compared with MAX8568AETE, MAX8568BETE delivers 1.8V LDO output essential for modern low-voltage memory, while TPS65217C trades backup optimization for broader system integration - making MAX8568BETE the precise fit for cost-sensitive, battery-backed portable devices requiring guaranteed switchover and chemically aware charging.
Availability
MAX8568BETE is available at Aetrix Electronics and suitable for smartphone memory backup, PDA RTC support, digital still camera settings retention, and wireless handheld configuration storage requiring stable component supply across industrial temperature ranges.
Supply support for MAX8568BETE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, computing, and portable applications.
The MAX8568 family targets smart portable devices needing autonomous backup power management - integrating charging, switchover, and dual-rail regulation in minimal footprint for PDAs, smartphones, and handhelds.
FAQ
What is the LDO output voltage of the MAX8568BETE?
The MAX8568BETE features a fixed 1.8V LDO output (LDO pin), with ±5% accuracy over –40°C to +85°C. This distinguishes it from the MAX8568AETE, which provides 2.5V. The LDO is powered from the BKSU rail and delivers up to 10mA with only 5µA quiescent current - making it ideal for low-voltage SRAM and memory interfaces in portable systems using the MAX8568BETE.
How does the MAX8568BETE handle NiMH versus lithium backup battery charging?
The MAX8568BETE uses the NI/LI pin to select chemistry: tied to BKSU for NiMH (enabling fast/trickle charge with VBK(NILO)/VBK(NIHI) thresholds), or to GND for lithium (activating constant-current/constant-voltage regulation where VBK(LIMAX) = 3.5 × VTERMV). The MAX8568BETE implements these algorithms entirely on-chip - no external controllers or firmware are needed to manage either chemistry safely.
What is the backup switchover timing behavior of the MAX8568BETE?
When VINOK falls below 2.43V (typ), the MAX8568BETE disables charging, drives OD1 and OD2 to high-impedance within 1µs to disconnect main supplies, and enables the boost converter - which reaches regulation at BKSU within 50µs. The 1.8V LDO activates concurrently. This hardware-controlled sequence ensures deterministic, sub-100µs switchover critical for preserving volatile memory contents without software intervention in the MAX8568BETE.
Can the MAX8568BETE operate without an external inductor or diode?
No - the MAX8568BETE requires an external inductor (typically 10µH) connected to LX and an external output capacitor (10–22µF ceramic) at BKSU. However, it does integrate a synchronous rectifier, eliminating the need for an external Schottky diode. This reduces component count and improves efficiency compared to asynchronous boost topologies - a key design advantage built into the MAX8568BETE architecture.
What package and thermal characteristics does the MAX8568BETE have?
The MAX8568BETE is supplied in a 16-pin 3mm × 3mm thin QFN package (T1633-4) with exposed paddle (EP) that must be soldered to the PCB ground plane for thermal dissipation and electrical stability. Its thermal resistance θJA is 15.6°C/W above +70°C, supporting 1250mW continuous power dissipation at +70°C - enabling reliable operation in compact, sealed handheld enclosures using the MAX8568BETE.
MAX8568BETE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Power Management
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN-EP (3x3)
MAX8568BETE FAQ
1.How can I place an order for MAX8568BETE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8568BETE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX8568BETE reliable?
The price and inventory of MAX8568BETE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8568BETE is usually 5 days.
3.What payment methods are accepted for MAX8568BETE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8568BETE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8568BETE?
MAX8568BETE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8568BETE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX8568BETE?
For technical support, including MAX8568BETE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8568BETE requirements.
6.How does Aetrix verify that MAX8568BETE is sourced from the original manufacturer or authorized distributors?
All MAX8568BETE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX8568BETE meets industry standards.
7.What is the process for return or replacement of MAX8568BETE?
All MAX8568BETE units undergo pre-shipment inspection (PSI). If there is an issue with MAX8568BETE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX8568BETE part is unused and in its original packaging.
Return procedure for MAX8568BETE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX8568BETE Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
