My Inquiry
My Account
Analog Devices Inc. LTC1550CGN#TRPBF
- Part No.:
- LTC1550CGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1550CGN#TRPBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 10MA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,846
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1550CGN#TRPBF from Analog Devices (formerly Linear Technology) is an adjustable-output, low-noise switched-capacitor voltage inverter with integrated linear post-regulator. It generates regulated negative output voltages from a single 2.7V–6.5V positive supply, delivers up to 10mA output current, maintains ±5% output regulation, and achieves <1mVP-P output ripple at 900kHz charge pump frequency - ideal for GaAs FET biasing in portable RF transmitters.
For engineers reviewing the LTC1550CGN#TRPBF datasheet, LTC1550CGN#TRPBF pinout, LTC1550CGN#TRPBF application, or LTC1550CGN#TRPBF equivalent, key selection criteria include its 16-pin SSOP package, adjustable output via external resistor divider (ADJ/SENSE), active-low shutdown (SHDN), dual ground pins (PGND/AGND), and compatibility with 0.1µF ceramic charge pump capacitors.
Technical Context
The LTC1550CGN#TRPBF integrates a 900kHz switched-capacitor inverter stage followed by a negative linear regulator using an N-channel MOSFET pass device and internal 1.24V reference. Its feedback loop monitors VOUT via SENSE and regulates through ADJ pin, enabling precise user-defined output voltages.
It operates across 2.7V–6.5V input range, supports shutdown quiescent current <0.2µA, features separate power (PGND) and analog (AGND) grounds for noise-sensitive regulation, and requires only four external components (CIN, C1+, C1−, CPOUT) plus two resistors for adjustment - no inductors or transformers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | Adjustable negative voltage inverter with linear post-regulation |
| Input Voltage Range | 2.7V to 6.5V - enables operation from single Li-ion or 3.3V/5V rails |
| Max Output Current | 10mA at VCC = 5V - sufficient for GaAs FET gate bias in cellular front-ends |
| Output Ripple | <1mVP-P - achieved with 10µF + 0.1µF output capacitor, critical for low-noise RF bias |
| Charge Pump Frequency | 900kHz typical - avoids IF bands (400–600kHz), reduces capacitor size, minimizes EMI |
| Shutdown Current | 0.2µA typical - enables ultra-low-power sleep mode in battery-powered systems |
| Output Regulation Accuracy | ±5% over load (0–10mA) and input (2.7–6.5V) ranges - ensures stable FET bias under varying conditions |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 0.150" narrow body, RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 16 | No Connect (NC) | Unbonded die pads - must remain unconnected per datasheet |
| 4, 11 | ADJ | Feedback node for external resistor divider - sets output voltage as VOUT = –1.24V × (R1+R2)/R2 |
| 5, 12 | VOUT | Negative regulated output - requires ≥4.7µF bypass capacitor for stability |
| 6, 13 | SENSE | Output voltage sensing point - connect directly to VOUT near load for accurate regulation |
| 7, 14 | CPOUT | Negative charge pump output - connects to 0.1µF storage capacitor to ground |
| 8, 15 | GND / PGND | Power ground - low-impedance return path for charge pump switching current |
| 9 | VCC | Positive supply input - bypass with ≥4.7µF capacitor close to pin |
| 10 | SHDN | Active-low shutdown control - pulls low to disable charge pump and reduce IQ to 0.2µA |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Set via external resistor divider on ADJ/SENSE - supports custom bias points (e.g., –2.0V to –4.5V) |
| Integrated linear post-regulator | Reduces charge pump ripple to <1mVP-P - eliminates need for external LDO in noise-critical RF bias paths |
| Dual ground separation (PGND/AGND) | Minimizes coupling between switching noise and regulation feedback - improves long-term DC accuracy |
| Low-quiescent-current shutdown | 0.2µA typical IQ in shutdown - extends battery life in intermittent-transmit wireless devices |
| 900kHz fixed oscillator | Enables use of 0.1µF ceramic flying capacitors - reduces BOM cost and PCB area vs lower-frequency pumps |
Applications
| Portable RF Transmitter Bias | GaAs FET Gate Control |
|---|---|
|
Use Scenario: Providing stable negative gate bias to GaAs power amplifier FETs in GSM/CDMA handsets during transmit bursts. IC Role / Device Role / Timing Role: Adjustable negative voltage generator with fast transient response and ultra-low ripple - replaces discrete charge pump + LDO solutions. Use Value: Enables precise VGS control across temperature and battery voltage variation, improving PA linearity and efficiency. |
Use Scenario: Generating programmable gate voltage for tunable GaAs switch/FET arrays in multi-band front-end modules. IC Role / Device Role / Timing Role: Digitally adjustable bias source - output set via resistor divider to match specific FET threshold requirements. Use Value: Eliminates need for multiple fixed-voltage regulators or DAC-based bias circuits, reducing component count and calibration complexity. |
| Battery-Powered Instrumentation | Single-Supply Signal Conditioning |
|
Use Scenario: Supplying clean negative rail for op-amps and ADC drivers in handheld test equipment powered by 3.3V or 5V batteries. IC Role / Device Role / Timing Role: Low-noise inverter with linear regulation - provides stable reference for precision analog signal chains. Use Value: Delivers <1mVP-P ripple without ferrite beads or LC filters, simplifying layout and improving measurement SNR. |
Use Scenario: Creating bipolar supplies for rail-to-rail op-amps in industrial sensor interfaces where only one positive supply is available. IC Role / Device Role / Timing Role: Compact, capacitor-only negative generator - avoids inductor-based solutions that introduce EMI and size penalties. Use Value: Enables true bipolar operation from single supply with minimal footprint - critical for space-constrained IoT sensor nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable negative voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1550IGN#TRPBF | Same functionality and pinout, but rated for –40°C to 85°C industrial temperature range vs. 0°C to 70°C for LTC1550CGN#TRPBF | Suitable for extended-temperature environments (e.g., automotive infotainment, outdoor base stations) | Select LTC1550IGN#TRPBF when operating beyond commercial temperature limits; otherwise LTC1550CGN#TRPBF suffices for consumer/portable designs. |
| LTC1261CS8#PBF | Fixed-output (–5V or –12V selectable), 8-pin SO-8 package, no ADJ/SENSE pins, higher max output current (25mA), but no linear post-regulator - ripple ~10mVP-P | Better for high-current, non-critical-noise applications like logic level shifting or generic analog bias | Choose LTC1261CS8#PBF only if fixed output and higher current outweigh need for ultra-low ripple and adjustable voltage. |
Compared with LTC1550IGN#TRPBF, the LTC1550CGN#TRPBF trades extended temperature capability for lower cost and qualification scope; compared with LTC1261CS8#PBF, it sacrifices output current headroom to deliver superior noise performance and design flexibility via adjustable output - making it uniquely suited for RF bias where ripple and precision dominate.
Availability
LTC1550CGN#TRPBF is available at Aetrix Electronics and suitable for portable RF transmitters, GaAs FET bias generators, and battery-powered instrumentation requiring stable component supply, consistent parametric performance, and long-term sourcing continuity.
Supply support for LTC1550CGN#TRPBF 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 acquired Linear Technology in 2017 and continues to manufacture, qualify, and support its precision analog and power management portfolio.
The LTC1550 family was designed specifically for low-noise, capacitor-based negative voltage generation in portable RF systems - emphasizing ripple suppression, small external component count, and robust regulation under dynamic load conditions.
FAQ
What output voltage range can be set with the LTC1550CGN#TRPBF?
The LTC1550CGN#TRPBF supports adjustable negative output voltages determined by the external resistor divider on ADJ and SENSE pins. Using the formula VOUT = –1.24V × (R1 + R2)/R2, typical configurations yield outputs from –2.0V to –4.5V. The datasheet confirms stable regulation across this range with ≤±5% error at loads up to 10mA and input voltages from 2.7V to 6.5V. The LTC1550CGN#TRPBF does not support outputs beyond –4.725V or below –1.425V under guaranteed conditions.
How does the LTC1550CGN#TRPBF achieve sub-1mVP-P output ripple?
The LTC1550CGN#TRPBF achieves <1mVP-P output ripple through a two-stage architecture: a 900kHz switched-capacitor inverter followed by an internal linear post-regulator with N-channel MOSFET pass device and precision feedback loop. This design actively suppresses charge pump switching artifacts. Combined with recommended 10µF tantalum + 0.1µF ceramic output capacitance and proper PCB layout (short SENSE trace to VOUT), the LTC1550CGN#TRPBF meets this ripple specification across 0–10mA loads at 25°C.
What is the function of the separate PGND and AGND pins on the LTC1550CGN#TRPBF?
The LTC1550CGN#TRPBF features dedicated PGND (pins 8, 15) and AGND (pin 11) to isolate high-current switching return paths from sensitive analog regulation circuitry. PGND carries pulsed charge pump current, while AGND serves as the quiet reference for the internal error amplifier and SENSE feedback network. Separating these grounds prevents ground bounce from degrading regulation accuracy and output noise - a critical design feature confirmed in the LTC1550CGN#TRPBF's layout guidelines and performance curves.
Can the LTC1550CGN#TRPBF operate from a 3.3V supply?
Yes, the LTC1550CGN#TRPBF is explicitly specified to operate from 2.7V to 6.5V input voltage, making it fully compatible with 3.3V systems. Electrical Characteristics tables confirm output regulation (±5%) and 10mA load capability down to VCC = 2.7V for certain output voltage settings (e.g., –2.0V). However, maximum achievable output voltage magnitude decreases with lower VCC - for example, –4.1V output requires ≥4.5V VCC per datasheet test conditions. The LTC1550CGN#TRPBF remains functional and regulated across the full 2.7V–6.5V range.
What external components are mandatory for basic operation of the LTC1550CGN#TRPBF?
Four mandatory external components are required for basic LTC1550CGN#TRPBF operation: a 4.7µF (minimum) input bypass capacitor (CIN) from VCC to PGND; two 0.1µF ceramic charge pump capacitors (C1 between C1+ and C1–, CCP between CPOUT and PGND); and a 4.7µF (minimum) output filter capacitor (COUT) from VOUT to PGND. For adjustable output, two additional resistors forming a divider from VOUT to AGND with tap at ADJ are mandatory. All capacitors must be placed close to respective pins per layout recommendations in the LTC1550CGN#TRPBF datasheet.
LTC1550CGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- -1.24V
- Voltage - Output (Max):
- -6.1V
- Current - Output:
- 10mA
- Frequency - Switching:
- 900kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1550CGN#TRPBF FAQ
1.How can I place an order for LTC1550CGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1550CGN#TRPBF 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 LTC1550CGN#TRPBF reliable?
The price and inventory of LTC1550CGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1550CGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1550CGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1550CGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1550CGN#TRPBF?
LTC1550CGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1550CGN#TRPBF 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 LTC1550CGN#TRPBF?
For technical support, including LTC1550CGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1550CGN#TRPBF requirements.
6.How does Aetrix verify that LTC1550CGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1550CGN#TRPBF 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 LTC1550CGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1550CGN#TRPBF?
All LTC1550CGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1550CGN#TRPBF, 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 LTC1550CGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1550CGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1550CGN#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
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…
