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Texas Instruments LM2770SD-1215
- Part No.:
- LM2770SD-1215
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2770SD-1215.pdf
- Description:
- IC REG CHARGE PUMP PROG 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,314
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Product details
Overview
LM2770SD-1215 from Texas Instruments is a switched capacitor step-down DC/DC regulator with dual-output voltage selection (1.2V/1.5V), dynamic VSEL control, sleep-mode LDO bypass, and 250 mA output capability. It operates from 2.7V–5.5V input, delivers ±3% output accuracy, and achieves >85% peak efficiency in full-power mode for portable baseband and DSP power supplies.
For engineers reviewing the LM2770SD-1215 datasheet, LM2770SD-1215 pinout, LM2770SD-1215 application, or LM2770SD-1215 equivalent, this device supports critical low-noise, battery-efficient power sequencing in mobile phones, pagers, and handheld electronics where dynamic voltage scaling and ultra-low quiescent current (55 µA) are required.
Technical Context
The LM2770SD-1215 implements a pulse-frequency-modulated (PFM) multi-gain charge pump architecture with three fractional gains (⅓, ½, ⅔) selected automatically to maximize efficiency across 2.7V–5.5V input and 0–250 mA load ranges. Its internal switch array controls two external flying capacitors (C1, C2) to transfer charge without inductors.
Sleep mode disables the charge pump and engages a dedicated low-noise LDO delivering up to 20 mA at 1.2V or 1.5V with 50–65 µA quiescent current. Voltage selection is controlled by the VSEL pin (logic-high = high-voltage output), while EN and SLEEP pins provide independent enable and mode control with defined VIH/VIL thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion battery operation across full discharge curve. |
| Output Voltage Options | 1.2V / 1.5V pair - selectable via VSEL logic pin; ±3% regulation accuracy over temperature and load. |
| Max Output Current | 250 mA - full-power mode; 20 mA in sleep-mode LDO bypass for low-noise standby operation. |
| Peak Efficiency | >85% - achieved using adaptive gain switching (G = ⅓, ½, ⅔) and PFM control to minimize switching losses. |
| Quiescent Current | 55 µA (full-power), 50–65 µA (sleep mode) - enables extended battery life in always-on portable systems. |
| Switching Frequency | 475–925 kHz - PFM-variable frequency reduces EMI and improves light-load efficiency. |
| Protection Features | Short-circuit protection (400 mA typ.), current limit in sleep mode (60 mA), thermal shutdown (150°C), soft-start (200 µs). |
Pinout & Package
LM2770SD-1215 is housed in a 3 mm × 3 mm × 0.8 mm WSON-10 package (Package Number DSC0010A) with exposed die-attach pad (DAP) for thermal dissipation. Pin numbering follows top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSEL | Output voltage select logic input | High = 1.5V output; Low = 1.2V output - enables dynamic voltage scaling without external components. |
| EN | Enable logic input | High = enabled; Low = shutdown (0.1–0.5 µA supply current) - provides system-level power gating. |
| C2+, C2− | Flying capacitor 2 terminals | Interface with external 1 µF ceramic capacitor to support charge transfer in multi-gain pumping cycle. |
| GND | Ground reference | Primary return path for all internal circuits and flying capacitor currents; connects to DAP for thermal conduction. |
| C1+, C1− | Flying capacitor 1 terminals | Second flying capacitor node enabling 3-gain architecture; requires 1 µF X5R/X7R MLCC per TI recommendations. |
| VIN | Input voltage supply | Accepts 2.7–5.5V; decoupled with 10 µF ceramic capacitor (CIN) to suppress ripple and stabilize charge pump operation. |
| VOUT | Regulated output | Delivers 1.2V or 1.5V with <0.18 mV/mA load regulation; filtered by 10 µF ceramic capacitor (COUT) to minimize ripple. |
| SLEEP | Sleep mode logic input | High = LDO active (low-noise, 20 mA max); Low = full-power charge pump active - enables seamless mode transition. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-gain switched capacitor topology | Automatically selects G = ⅓, ½, or ⅔ to maintain >82% average efficiency across Li-ion input range (3.0–4.2V). |
| Dual-output voltage selection | Hardware-selectable 1.2V/1.5V pair via VSEL pin - eliminates need for external DAC or voltage-setting resistors. |
| Sleep-mode LDO bypass | Integrated low-noise linear regulator activated by SLEEP pin - reduces output ripple and quiescent current under light loads (≤20 mA). |
| PFM regulation with soft-start | 200 µs controlled ramp-up prevents inrush current; variable-frequency operation minimizes EMI and improves light-load efficiency. |
| Robust protection suite | Includes short-circuit (400 mA), sleep-mode current limit (60 mA), thermal shutdown (150°C), and input overvoltage tolerance (6.0V max). |
Applications
| Mobile Baseband Power | DSP Core Supply |
|---|---|
Use Scenario: Powering baseband processor cores in GSM/UMTS smartphones during active call and idle states. IC Role / Device Role / Timing Role: Primary step-down regulator delivering dynamically scaled 1.2V/1.5V to digital baseband ICs with fast VSEL response (<40 µs). Use Value: Reduces system power by enabling lower core voltage during idle; sleep-mode LDO maintains low-noise supply during standby with 50 µA quiescent current. |
Use Scenario: Supplying programmable DSPs in portable audio devices requiring clean, stable voltage under variable computational load. IC Role / Device Role / Timing Role: High-efficiency switched-capacitor regulator replacing inductor-based buck converters to eliminate magnetic interference near sensitive analog circuitry. Use Value: Achieves >85% peak efficiency without inductors; PFM operation minimizes ripple-sensitive noise during low-load audio playback. |
| Pager System Power | Handheld Medical Monitor |
Use Scenario: Providing regulated power to ultra-low-power pager SoCs operating on coin-cell or Li-ion batteries with multi-year shelf life. IC Role / Device Role / Timing Role: Dual-voltage regulator supporting both active transmission (1.5V) and deep-sleep (1.2V) modes via VSEL and SLEEP control. Use Value: Extends battery life through 0.1 µA shutdown current, 55 µA full-power IQ, and seamless sleep-to-active transitions in <200 µs. |
Use Scenario: Powering microcontroller and sensor interface in battery-operated medical monitors requiring FDA-grade low-noise, reliable operation. IC Role / Device Role / Timing Role: Primary DC/DC converter with integrated LDO bypass for analog front-end sensors during measurement cycles. Use Value: Eliminates external LDO while maintaining <200 mVpp ripple in full-power mode and <50 mVpp in sleep mode - meets clinical signal integrity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments LM27762 | Single 1.8V output; no VSEL or dual-voltage option; higher 300 mA IOUT; uses different capacitor configuration (no C2). | Best suited for fixed-voltage, higher-current applications where dynamic scaling is unnecessary. | Select LM27762 only if 1.8V output and simplified layout (3 external caps) outweigh need for 1.2V/1.5V flexibility. |
| Analog Devices ADP5600 | Wider input range (2.7–5.5V); supports 1.2V/1.8V pair; includes I²C interface for voltage control; larger 16-pin LFCSP package. | Preferred when digital programmability, higher precision, or multi-rail coordination is required beyond simple logic-level VSEL. | Choose ADP5600 when system demands I²C-configurable outputs or tighter initial accuracy (±1.5%) versus LM2770SD-1215's ±3%. |
Compared with LM2770SD-1215, LM27762 offers higher current but lacks voltage scaling, while ADP5600 adds digital control at the cost of increased complexity and footprint - LM2770SD-1215 remains optimal for cost-sensitive, space-constrained designs needing hardware-based 1.2V/1.5V switching and ultra-low IQ.
Availability
LM2770SD-1215 is available at Aetrix Electronics and suitable for mobile phone power management, portable medical device subsystems, and handheld industrial data loggers requiring stable component supply with long-term lifecycle assurance.
Supply support for LM2770SD-1215 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies with decades of expertise in battery-powered system solutions.
The LM2770 product line was designed specifically for ultra-compact, inductorless power conversion in space-constrained portable electronics - prioritizing efficiency, low noise, and dynamic voltage scaling without external passive components.
FAQ
What output voltage options does the LM2770SD-1215 support?
The LM2770SD-1215 supports a fixed 1.2V/1.5V output voltage pair. When the VSEL pin is driven high, the device regulates to 1.5V (±3%); when VSEL is low, it regulates to 1.2V (±3%). This dual-voltage capability is factory-trimmed and does not require external feedback resistors - the exact behavior is confirmed in the Electrical Characteristics table for LM2770-1215 on page 3 of the SNVS318E datasheet.
How does the LM2770SD-1215 achieve high efficiency without an inductor?
The LM2770SD-1215 uses a switched-capacitor (charge pump) architecture with three fractional gains (⅓, ½, ⅔) and pulse-frequency modulation (PFM) to deliver >85% peak efficiency. It transfers energy via two external 1 µF flying capacitors (C1, C2) and dynamically selects the optimal gain based on VIN and load - eliminating inductor losses while maintaining regulation across 2.7V–5.5V input.
What is the role of the SLEEP pin on the LM2770SD-1215?
The SLEEP pin on the LM2770SD-1215 controls mode selection between full-power charge pump operation (SLEEP = low) and low-noise LDO bypass operation (SLEEP = high). In sleep mode, the charge pump is disabled and a dedicated linear regulator supplies up to 20 mA with 50–65 µA quiescent current - reducing output ripple and extending battery life during light-load conditions.
Can the LM2770SD-1215 be used with input voltages below 2.7V?
No - the LM2770SD-1215 has a specified minimum input voltage of 2.7V per its Operating Ratings. Below this threshold, regulation is not guaranteed, and the device may fail to start or sustain output. The Absolute Maximum Rating for VIN is −0.3V to +6.0V, but functional operation is strictly limited to 2.7V–5.5V as validated in all electrical characteristics and performance curves for LM2770SD-1215.
What capacitor types are recommended for the LM2770SD-1215?
Texas Instruments specifies low-ESR X5R or X7R multilayer ceramic capacitors (MLCCs) for all four external capacitors: CIN and COUT (10 µF), C1 and C2 (1 µF). Y5V and Z5U dielectrics are explicitly discouraged due to severe DC-bias-induced capacitance loss and wide temperature drift - using them risks instability, excessive ripple, or failure to meet load transient response specs in the LM2770SD-1215 application circuit.
LM2770SD-1215 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V, 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 250mA
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (3x3)
LM2770SD-1215 FAQ
1.How can I place an order for LM2770SD-1215 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2770SD-1215 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 LM2770SD-1215 reliable?
The price and inventory of LM2770SD-1215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2770SD-1215 is usually 5 days.
3.What payment methods are accepted for LM2770SD-1215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2770SD-1215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2770SD-1215?
LM2770SD-1215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2770SD-1215 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 LM2770SD-1215?
For technical support, including LM2770SD-1215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2770SD-1215 requirements.
6.How does Aetrix verify that LM2770SD-1215 is sourced from the original manufacturer or authorized distributors?
All LM2770SD-1215 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 LM2770SD-1215 meets industry standards.
7.What is the process for return or replacement of LM2770SD-1215?
All LM2770SD-1215 units undergo pre-shipment inspection (PSI). If there is an issue with LM2770SD-1215, 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 LM2770SD-1215 part is unused and in its original packaging.
Return procedure for LM2770SD-1215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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