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Analog Devices Inc. ADP1655ACBZ-R7
- Part No.:
- ADP1655ACBZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 12-WFBGA, WLCSP
- Datasheet:
-
ADP1655ACBZ-R7.pdf
- Description:
- IC LED DRVR RGLTR I2C 12WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,077
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Product details
Overview
ADP1655ACBZ-R7 from Analog Devices is a dual white LED flash driver IC with integrated 2 MHz synchronous boost converter, I²C-compatible interface, and programmable 500 mA current source. It delivers up to 400 mA per LED in flash mode (two LEDs), 5% current accuracy at 320–500 mA, and operates from 2.7 V to 5.5 V input for Li-ion battery-powered camera modules.
For engineers reviewing the ADP1655ACBZ-R7 datasheet, ADP1655ACBZ-R7 pinout, ADP1655ACBZ-R7 application, or ADP1655ACBZ-R7 equivalent, key selection criteria include flash/torch current programmability, Tx-mask–enabled GSM burst mitigation, thermal shutdown at 150°C, WLCSP-12 package footprint, and I²C register-based safety fault monitoring (overvoltage, short-circuit, timeout).
Technical Context
The ADP1655ACBZ-R7 integrates a fixed-frequency 2 MHz synchronous boost regulator with internal N-FET (135 mΩ) and P-FET (290 mΩ) switches, enabling use of a compact 2.2 μH inductor. Its LED current regulation uses an integrated PMOS current source referenced to LED_OUT, supporting cathode-grounded LED layouts for low EMI and thermal efficiency.
Control is implemented via dual-mode interface: logic-level 2-bit mode (I2C/EN = 0) for basic enable/flash/torch states, or full I²C mode (I2C/EN = 1, address 0x60/0x61) for register-level configuration of flash timer (100–850 ms), LED count detection thresholds (4.0–4.9 V), and current values across assist light, torch, and flash modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports full Li-ion battery discharge curve without external regulation. |
| Max Flash Current (2 LEDs) | 400 mA - programmable via I²C register 0x03, ±5% accuracy ensures consistent flash brightness. |
| Switching Frequency | 1.85–2.15 MHz - enables use of 2.2 μH low-profile inductor, minimizing PCB area and EMI. |
| LED Current Accuracy | ±5% at 320–500 mA - critical for color-matched dual-LED flash calibration in smartphone cameras. |
| Thermal Shutdown | 150°C (rising), 140°C (falling) - hysteresis prevents thermal oscillation during sustained torch operation. |
| Overvoltage Protection | 9.0–10.1 V on VOUT - detects open-circuit LED failure and disables output to prevent system damage. |
| I²C Address | 0x60 (write), 0x61 (read) - standard 7-bit addressing compatible with common microcontroller peripherals. |
Pinout & Package
ADP1655ACBZ-R7 is housed in a 2 mm × 1.5 mm, 0.5 mm pitch, 12-ball Wafer-Level Chip Scale Package (WLCSP) optimized for ultra-compact mobile camera modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (A1) | Power Ground | Return path for internal switching FET; must be connected to power ground plane with low-inductance layout. |
| SGND (A2) | Signal Ground | Reference for analog circuitry; requires single-point tie to PGND to avoid ground bounce. |
| VIN (A3) | Input Supply | Connects to Li-ion battery (2.7–5.5 V); requires ≥4 μF X5R/X7R ceramic bypass capacitor. |
| SW (B1) | Switch Node | Drives external 2.2 μH inductor; high dv/dt node requiring tight loop routing and guard ring. |
| TORCH (B2) | Digital Input | Hardware-enable for continuous torch mode; overrides I²C state when asserted high. |
| TX_MASK (B3) | Digital Input | Active-high signal that forces flash current reduction to assist-light level during GSM PA bursts. |
| VOUT (C1) | Boost Output Sense | Regulated boost voltage node; connects to 10 μF output capacitor and feeds LED current source. |
| STROBE (C2) | I/O (Mode-Dependent) | In I²C mode: sync input for camera timing; in logic mode: LED count indicator (high = two LEDs). |
| I2C/EN (C3) | Interface Select | Logic high = I²C mode; logic low = 2-bit logic mode; also enables shutdown when low with EN1/EN2 low. |
| LED_OUT (D1) | LED Anode Driver | PMOS current source output; connects directly to LED anodes; supports local LED grounding. |
| SDA/EN2 (D2) | I/O (Mode-Dependent) | In I²C mode: bidirectional data line; in logic mode: second control bit (EN2) for mode selection. |
| SCL/EN1 (D3) | Input (Mode-Dependent) | In I²C mode: clock input; in logic mode: first control bit (EN1) for mode selection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultracompact WLCSP-12 package | 2 mm × 1.5 mm footprint enables integration into space-constrained camera modules without sacrificing thermal performance. |
| Synchronous 2 MHz boost converter | Eliminates external Schottky diode, reduces component count, and improves efficiency to 88% peak at 3.6 V input. |
| I²C-programmable flash timer | Configurable 100–850 ms duration (register 0x02) allows precise synchronization with camera exposure timing. |
| Tx-mask–driven current reduction | Hardware-level response (<4 µs) to GSM transmit bursts minimizes battery current spikes during cellular transmission. |
| Integrated safety monitoring | Real-time detection of overvoltage (9.5 V), short-circuit (1.3 V comparator), timeout, thermal overload, and inductor faults. |
Applications
| Smartphone Camera Flash | Digital Still Camera Assist Light |
|---|---|
Use Scenario: Dual-LED flash illumination for high-resolution still capture in low-light conditions on 4G/5G smartphones. IC Role / Device Role / Timing Role: Primary flash driver controlling synchronized 400 mA current delivery to two white LEDs with 850 ms max timeout. Use Value: Enables consistent color temperature and luminance across dual LEDs while suppressing battery current surges during concurrent GSM transmission. | Use Scenario: Continuous low-power illumination for autofocus assistance and video recording in compact digital cameras. IC Role / Device Role / Timing Role: Programmable assist light driver delivering 20–160 mA with 10% accuracy in torch mode via I²C register 0x03. Use Value: Provides stable, flicker-free illumination without requiring external current-setting resistors or discrete regulators. |
| Mobile Camcorder Torch Mode | Tablet-Based Video Conferencing Lighting |
Use Scenario: Always-on ambient lighting for front-facing video calls on slim-profile tablets and foldables. IC Role / Device Role / Timing Role: Low-quiescent-current (5.3 mA typical) torch driver operating from 3.6 V supply with soft-start ramp control. Use Value: Delivers 160 mA at ±10% accuracy with <1 ms LED_OUT ramp-up time, eliminating visible turn-on delay. | Use Scenario: Secondary illumination source for front-camera depth sensing and low-light facial recognition in enterprise tablets. IC Role / Device Role / Timing Role: Dual-mode driver supporting both assist light (40 mA default) and flash (400 mA) based on real-time scene analysis. Use Value: Reduces BOM count by integrating boost, current regulation, safety logic, and I²C interface in one 2 mm × 1.5 mm package. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3644TME/NOPB | 4-mm² DSBGA-12 package; 1.5 MHz switching; max 1.5 A total flash current (single/dual LED configurable); no Tx-mask pin. | Lacks hardware Tx-mask input; relies on I²C interrupt-driven GSM coordination; higher quiescent current (15 μA vs. 1 μA shutdown). | Choose LM3644TME/NOPB when higher total flash current (>400 mA per LED) is required and GSM burst mitigation can be handled in firmware. |
| MAX77693EWL+T | Multi-rail PMIC with integrated flash LED driver (max 1.5 A), buck, LDOs, and fuel gauge; 32-ball WLP; I²C-controlled but no dedicated STROBE or TX_MASK pins. | System-level integration reduces component count but increases complexity; not optimized solely for flash performance or low EMI LED grounding. | Choose MAX77693EWL+T when consolidating power management and flash functionality into a single PMIC is prioritized over minimal flash-specific footprint and EMI optimization. |
Compared with LM3644TME/NOPB and MAX77693EWL+T, the ADP1655ACBZ-R7 offers superior EMI performance via cathode-grounded LED layout, faster hardware-based Tx-mask response (<4 µs), and smallest footprint (3 mm²), making it optimal for ultra-thin smartphone camera modules where board space and RF coexistence are critical.
Availability
ADP1655ACBZ-R7 is available at Aetrix Electronics and suitable for smartphone camera flash, digital camcorder assist light, and tablet-based video conferencing lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADP1655ACBZ-R7 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADP1655ACBZ-R7 belongs to Analog Devices' camera power management product line, designed specifically for high-efficiency, low-EMI, space-constrained LED flash and assist lighting in mobile imaging systems.
FAQ
What is the maximum LED current supported by the ADP1655ACBZ-R7 in dual-LED flash mode?
The ADP1655ACBZ-R7 supports up to 400 mA per LED when driving two LEDs in flash mode, with ±5% accuracy over temperature and input voltage. This value is achieved using I²C register 0x03 with flash current setting bits set to 1010 (binary), and is validated across the full −40°C to +125°C junction temperature range. The ADP1655ACBZ-R7 maintains this current level while limiting peak inductor current to 2.0 A under worst-case conditions.
Does the ADP1655ACBZ-R7 require an external Schottky diode for boost operation?
No, the ADP1655ACBZ-R7 does not require an external Schottky diode. It integrates a synchronous rectifier with internal N-FET and P-FET switches, enabling 2 MHz operation and achieving up to 88% peak efficiency. The absence of an external diode reduces component count, PCB area, and forward-voltage losses-key advantages confirmed in the ADP1655ACBZ-R7 functional block diagram and Typical Performance Characteristics (Figure 14).
How does the TX_MASK pin function in the ADP1655ACBZ-R7 during GSM transmission bursts?
The TX_MASK pin on the ADP1655ACBZ-R7 provides hardware-level mitigation of battery current surges during GSM power amplifier bursts. When driven high, it forces the ADP1655ACBZ-R7 to reduce LED current from flash level (e.g., 400 mA) to assist light level (e.g., 40 mA) within <4 µs, as shown in Figure 16. This occurs without I²C intervention, preserving flash timing integrity while protecting battery and PMIC stability. The ADP1655ACBZ-R7 resumes full flash current automatically when TX_MASK returns low.
What package type and dimensions does the ADP1655ACBZ-R7 use?
The ADP1655ACBZ-R7 uses a 12-ball Wafer-Level Chip Scale Package (WLCSP) with 0.5 mm ball pitch, measuring 2.0 mm × 1.5 mm. This ultra-compact package is specified per JEDEC J-STD-020 moisture sensitivity level 1 and features a thermal resistance θJA of 75°C/W on a 4-layer reference board. The small footprint and low profile make the ADP1655ACBZ-R7 ideal for thin mobile camera modules where board space is constrained.
Can the ADP1655ACBZ-R7 operate in both I²C and pin-strapped modes?
Yes, the ADP1655ACBZ-R7 supports dual interface modes selected by the I2C/EN pin. When I2C/EN is high, the device operates in full I²C mode (address 0x60/0x61) for register-level control of current, timer, and safety status. When I2C/EN is low, it enters 2-bit logic mode using SCL/EN1 and SDA/EN2 as EN1 and EN2 inputs for basic mode selection (shutdown, torch, assist light, flash), as defined in Table 6 of the ADP1655ACBZ-R7 datasheet.
ADP1655ACBZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 500mA (Flash)
- Frequency:
- 2MHz
- Dimming:
- I2C
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WLCSP (1.5x2)
ADP1655ACBZ-R7 FAQ
1.How can I place an order for ADP1655ACBZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1655ACBZ-R7 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 ADP1655ACBZ-R7 reliable?
The price and inventory of ADP1655ACBZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1655ACBZ-R7 is usually 5 days.
3.What payment methods are accepted for ADP1655ACBZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1655ACBZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1655ACBZ-R7?
ADP1655ACBZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1655ACBZ-R7 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 ADP1655ACBZ-R7?
For technical support, including ADP1655ACBZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1655ACBZ-R7 requirements.
6.How does Aetrix verify that ADP1655ACBZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADP1655ACBZ-R7 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 ADP1655ACBZ-R7 meets industry standards.
7.What is the process for return or replacement of ADP1655ACBZ-R7?
All ADP1655ACBZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1655ACBZ-R7, 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 ADP1655ACBZ-R7 part is unused and in its original packaging.
Return procedure for ADP1655ACBZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADP1655ACBZ-R7 Tags
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