ADP5040ACPZ‑1‑R7: Micro PMU with 1.2A Buck & Two 300mA LDOs

1. Basic Information

• Manufacturer: Analog Devices Inc.
• Part Number: ADP5040ACPZ‑1‑R7
• Device Type: Integrated micro power management unit (PMU)
• Package: 20‑lead LFCSP, 4 mm × 4 mm, CP‑20‑8
• Marking: RoHS‑compliant; “Z” = lead‑free; “R7” = reel packaging
• Operating Junction Temp: −40°C to +125°C
• Storage Temp: −65°C to +150°C
• Revision: Rev. D
• UVLO Option: 3.65 V typical (Option 1)
• Active Pull‑Down: Enabled on all channels

2. Key Features

• 1 × high‑efficiency 1.2 A buck regulator
• 2 × low‑noise 300 mA LDOs (LDO1: digital; LDO2: analog‑optimized)
• Wide input voltage range
• 3 MHz fixed buck switching frequency
• Forced PWM or auto PWM/PSM mode selection
• 100% duty‑cycle low‑dropout operation
• Internal soft start
• Individual enable pins for each rail
• Comprehensive protection suite
• Tiny external components (multilayer ceramic caps/inductors)
• Low quiescent current for battery‑powered systems

3. Absolute Maximum Ratings

• AVIN to AGND: −0.3 V to +6 V
• VIN1 to AVIN, PGND to AGND: −0.3 V to +0.3 V
• VIN2, VIN3, VOUTx, ENx, MODE, FBx, SW to AGND: −0.3 V to (AVIN + 0.3 V)
• SW to PGND: −0.3 V to (VIN1 + 0.3 V)
• ESD HBM: 3000 V; CDM: 1500 V; MM: 200 V
• Max reflow temp: compliant with JEDEC J‑STD‑020

4. Electrical Specifications

4.1 General

• AVIN UVLO (Option 1): rising 3.9 V, falling 3.1 V
• Shutdown current (ENx = GND): 0.1–2 μA
• Thermal shutdown: 150°C (rising), 20°C hysteresis
• Buck startup time: 250 μs; LDO startup time: 85 μs
• Logic input: VIH ≥ 1.2 V, VIL ≤ 0.4 V (2.5 V ≤ AVIN ≤ 5.5 V)

4.2 Buck Regulator

• Input range: 2.3 V–5.5 V
• Output range: 0.8 V–3.8 V
• Output current: up to 1.2 A
• Switching frequency: 2.5–3.5 MHz (typ 3 MHz)
• Feedback voltage: 0.485–0.515 V
• Current limit: 1.6–2.3 A
• Peak efficiency: up to 96%
• PSM threshold: 100 mA
• Active pull‑down: 85 Ω

4.3 LDO1 & LDO2

• Input range: 1.7 V–5.5 V
• Output range: 0.8 V–5.2 V
• Output current: up to 300 mA each
• Feedback voltage: 0.485–0.515 V
• Output accuracy: ±3%
• Dropout voltage: 72–180 mV @ 300 mA
• PSRR: up to 66 dB @ 1 kHz
• Output noise: ~59–140 μV rms (10 Hz–100 kHz)
• Current limit: 335–470 mA
• Active pull‑down: 600 Ω

5. Protection Features

• Overcurrent protection (buck cycle‑by‑cycle; LDO current limiting)
• Thermal shutdown (150°C, auto‑recovery)
• Input undervoltage lockout (UVLO)
• Short‑circuit protection with frequency foldback (buck)
• Active output discharge when disabled

6. Pin Configuration & Functions

• AVIN: System supply (2.3–5.5 V)
• VIN1: Buck input
• SW: Buck switching node
• PGND: Buck power ground
• FB1: Buck feedback
• EN1: Buck enable
• MODE: Buck PWM/PSM control
• VIN2/VIN3: LDO inputs
• VOUT2/VOUT3: LDO outputs
• FB2/FB3: LDO feedbacks
• EN2/EN3: LDO enables
• AGND: Analog ground; EP: Exposed pad (must connect to GND)
• Pins 5, 18, 19, 20: DNC (do not connect)

7. Thermal Data

• θJA (20‑lead LFCSP): 38°C/W
• θJC: 4.2°C/W
• Max operating TJ: 125°C
• Exposed pad required for thermal performance

8. Application Information

8.1 Typical Applications

• Portable consumer electronics
• Battery‑powered devices
• Industrial & IoT sensors
• Low‑power microcontroller/processor rails
• Analog/digital mixed‑signal systems

8.2 External Components

• Buck inductor: 0.7–3.0 μH (1 μH recommended)
• Buck input cap: ≥4.7 μF (X5R/X7R)
• Buck output cap: ≥7 μF (10 μF recommended)
• LDO I/O caps: ≥0.7 μF (2.2 μF recommended for full load)
• Feedback dividers: set VOUT = VFB × (Rtop/Rbottom + 1), VFB = 0.5 V

8.3 PCB Layout Guidelines

• Place input/output caps, inductor close to IC
• Short, wide high‑current paths
• Dedicated ground plane; EP tied to GND with multiple vias
• Isolate SW node and inductor from analog feedback lines
• Maximize copper area for heat dissipation

9. Ordering Information

• ADP5040ACPZ‑1‑R7: −40°C to +125°C, 20‑LFCSP, UVLO = 3.65 V, active pull‑down enabled, RoHS, reel
• ADP5040CP‑1‑EVALZ: Evaluation board