My Inquiry
My Account
Analog Devices Inc. LTC1551CS8-4.1#TRPBF
- Part No.:
- LTC1551CS8-4.1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1551CS8-4.1#TRPBF.pdf
- Description:
- IC REG CHARG PUMP -4.1V 10MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,352
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1551CS8-4.1#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-output, switched-capacitor voltage inverter IC with integrated linear post-regulator, delivering –4.1V at up to 10mA from a single 4.5V–6.5V supply. It features 900kHz charge pump frequency, <1mVP-P output ripple, and TTL-compatible active-high shutdown (SHDN), making it suitable for GaAs FET biasing in portable RF transmitters.
For engineers reviewing the LTC1551CS8-4.1#TRPBF datasheet, LTC1551CS8-4.1#TRPBF pinout, LTC1551CS8-4.1#TRPBF application, or LTC1551CS8-4.1#TRPBF equivalent, key selection criteria include regulated negative output stability under load variation, low-noise performance in RF-sensitive environments, shutdown current <1µA, SO-8 package compatibility, and external capacitor count (only four required).
Technical Context
The LTC1551CS8-4.1#TRPBF integrates a 900kHz switched-capacitor charge pump followed by a negative linear regulator using an internal 1.24V reference and N-channel MOSFET pass device. Its regulation loop maintains ±5% output accuracy across 0–10mA loads and 4.5–6.5V input, with SENSE pin feedback enabling precise output monitoring near the load.
Unlike the adjustable LTC1550CGN, the LTC1551CS8-4.1#TRPBF uses internal resistor dividers to fix VOUT at –4.1V and features active-high SHDN logic-distinct from the LTC1550's active-low control-while sharing identical SO-8 packaging, thermal characteristics (θJA = 150°C/W), and absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed –4.1V, guaranteed ±5% regulation over 4.5–6.5V input and 0–10mA load. |
| Output Ripple | <1mVP-P typical with 10µF COUT + 0.1µF ceramic bypass; enables clean biasing of noise-sensitive GaAs FETs. |
| Charge Pump Frequency | 900kHz typical; places switching energy outside 400–600kHz IF bands used in cellular radios. |
| Supply Current | 4.25mA typical at VCC = 5V; drops to 0.2µA in shutdown mode (SHDN = high). |
| External Components | Only four required: 0.1µF C1+/C1–, 0.1µF CCP, and ≥4.7µF COUT; no inductors or transformers needed. |
| Operating Temperature | 0°C to 70°C (commercial grade); design validated for –40°C to 85°C by correlation. |
| Shutdown Logic | Active-high SHDN pin; asserts shutdown when pulled to VCC, reducing supply current to sub-µA levels. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150"), JEDEC MS-012AC, θJA = 150°C/W, TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SENSE) | Output voltage sense input | Connected directly to VOUT near load to compensate for PCB trace IR drop; critical for ±5% regulation accuracy. |
| 2 (CPOUT) | Negative charge pump output | Drives internal linear regulator; requires 0.1µF storage capacitor to ground for stable pumping action. |
| 3 (GND) | Ground reference | Low-impedance analog/power return; must connect to solid ground plane to minimize regulation error. |
| 4 (C1–) | Charge pump flying capacitor negative terminal | Completes charge transfer path with C1+; connects to 0.1µF ceramic capacitor shared with C1+. |
| 5 (SHDN) | Active-high shutdown control | Pull high to VCC to disable charge pump and reduce quiescent current to 0.2µA; TTL-compatible input threshold. |
| 6 (VCC) | Positive power supply input | Accepts 4.5–6.5V; requires ≥4.7µF bypass capacitor close to pin to prevent supply sag during charge cycling. |
| 7 (C1+) | Charge pump flying capacitor positive terminal | Switches between VCC and GND via internal 900kHz clock; forms flying capacitor node with C1–. |
| 8 (VOUT) | Regulated negative output | Delivers –4.1V; must be bypassed with ≥10µF tantalum + 0.1µF ceramic for <1mVP-P ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated linear post-regulator | Reduces charge pump ripple to <1mVP-P without external L-C filtering, simplifying layout in space-constrained RF modules. |
| 900kHz internal oscillator | Enables use of small 0.1µF ceramic flying capacitors and avoids interference with common IF bands (400–600kHz). |
| Active-high shutdown | Distinguishes LTC1551CS8-4.1#TRPBF from LTC1550; allows direct interface with microcontroller GPIOs without level-shifting. |
| Four-component solution | Eliminates inductors and reduces BOM count versus inductive DC/DC inverters-ideal for battery-powered handheld devices. |
| –4.1V GaAs FET bias optimization | Output voltage matches typical gate bias requirements for GaAs power amplifiers in cellular handsets and portable transceivers. |
Applications
| Portable RF Transmitter Bias | GaAs Power Amplifier Supply |
|---|---|
Use Scenario: Providing stable gate bias voltage to GaAs FETs in 2G/3G cellular handset power amplifiers operating from a single Li-ion cell-derived 5V rail. IC Role / Device Role / Timing Role: LTC1551CS8-4.1#TRPBF acts as a low-noise, regulated negative voltage generator that replaces discrete charge pump + LDO solutions. Use Value: Delivers –4.1V with <1mVP-P ripple, preventing AM-to-PM distortion in PA stages and meeting spectral mask requirements without added filtering. | Use Scenario: Generating clean negative supply for biasing the source terminal of dual-gate GaAs FETs in portable GPS receivers and Bluetooth transceivers. IC Role / Device Role / Timing Role: LTC1551CS8-4.1#TRPBF serves as a compact, low-quiescent-current inverter enabling always-on receiver operation. Use Value: Achieves 0.2µA shutdown current and fast 1ms turn-on time, extending battery life while maintaining rapid wake-up capability. |
| Single-Supply Instrumentation | Low-Power Sensor Interface |
Use Scenario: Creating a precision –4.1V reference for op-amp-based signal conditioning circuits in portable medical sensors powered from 5V USB or coin-cell sources. IC Role / Device Role / Timing Role: LTC1551CS8-4.1#TRPBF supplies rail-splitting functionality where dual supplies are needed but only one positive rail is available. Use Value: Maintains ±5% output regulation across temperature and load, ensuring consistent ADC reference and amplifier offset performance. | Use Scenario: Biasing MEMS microphone preamplifiers and analog front-ends in IoT edge nodes with strict power budgets. IC Role / Device Role / Timing Role: LTC1551CS8-4.1#TRPBF provides low-noise negative supply for JFET-input op-amps in ultra-low-power audio signal chains. Use Value: Enables <1mVP-P ripple performance with minimal external components, preserving SNR in sub-100µA system designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1550CS8-4.1#TRPBF | Identical SO-8 package and –4.1V output, but features active-low SHDN instead of active-high. | Requires inverted logic control signal; unsuitable where MCU GPIO cannot drive low-active enable without additional transistor. | Select LTC1550CS8-4.1#TRPBF only if existing firmware or hardware already implements active-low shutdown sequencing. |
| LTC1261CS8-5#TRPBF | Fixed –5V output, 100kHz charge pump, higher output ripple (~5mVP-P), no integrated linear regulator. | Better suited for non-RF applications where tighter ripple specs are not required; lacks SENSE pin for remote sensing. | Choose LTC1261CS8-5#TRPBF when cost sensitivity outweighs noise performance and ±5% regulation is acceptable. |
Compared with LTC1550CS8-4.1#TRPBF, the LTC1551CS8-4.1#TRPBF offers simplified digital control via active-high SHDN, while both share identical regulation accuracy and noise performance; versus LTC1261CS8-5#TRPBF, the LTC1551CS8-4.1#TRPBF delivers superior ripple suppression and tighter output tolerance essential for RF biasing.
Availability
LTC1551CS8-4.1#TRPBF is available at Aetrix Electronics and suitable for portable RF transmitters, GaAs power amplifier biasing, and single-supply instrumentation requiring stable component supply, low-noise negative voltage generation, and compact SO-8 footprint.
Supply support for LTC1551CS8-4.1#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1551CS8-4.1#TRPBF belongs to Linear Technology's legacy switched-capacitor voltage inverter product line, designed specifically for low-noise, low-component-count negative supply generation in battery-powered RF and portable communication systems.
FAQ
What is the output voltage tolerance of the LTC1551CS8-4.1#TRPBF?
The LTC1551CS8-4.1#TRPBF provides a fixed –4.1V output with guaranteed regulation of ±5% across its full operating range: 4.5V–6.5V input voltage and 0–10mA output load. This specification is verified over the commercial temperature range (0°C to 70°C) and correlated for –40°C to 85°C per the datasheet.
How does the LTC1551CS8-4.1#TRPBF differ from the LTC1550CS8-4.1#TRPBF?
The LTC1551CS8-4.1#TRPBF and LTC1550CS8-4.1#TRPBF share identical SO-8 packaging, –4.1V output, 900kHz charge pump, and regulation performance-but differ in shutdown logic: LTC1551CS8-4.1#TRPBF uses active-high SHDN, while LTC1550CS8-4.1#TRPBF uses active-low. This affects direct MCU interface requirements.
What external capacitors are required for stable operation of the LTC1551CS8-4.1#TRPBF?
The LTC1551CS8-4.1#TRPBF requires exactly four external capacitors: two 0.1µF ceramic flying capacitors (C1+, C1–), one 0.1µF ceramic charge pump storage capacitor (CPOUT to GND), and one ≥10µF output filter capacitor (VOUT to GND, preferably tantalum + 0.1µF ceramic parallel). An additional 4.7µF input bypass capacitor on VCC is strongly recommended.
Can the LTC1551CS8-4.1#TRPBF operate from a 3.3V supply?
No. The LTC1551CS8-4.1#TRPBF is specified only for 4.5V to 6.5V input supply voltage. Operation below 4.5V violates absolute maximum ratings and will result in failure to regulate the –4.1V output; for lower input voltages, consider the adjustable LTC1550CGN variant which supports down to 2.7V.
What is the purpose of the SENSE pin on the LTC1551CS8-4.1#TRPBF?
The SENSE pin on the LTC1551CS8-4.1#TRPBF provides remote output voltage sensing to compensate for voltage drop across PCB traces between VOUT and the load. It must be connected directly to the load-side of the output capacitor to maintain ±5% regulation accuracy under varying load conditions.
LTC1551CS8-4.1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- -4.1V
- Voltage - Output (Max):
- -
- 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:
- 8-SO
LTC1551CS8-4.1#TRPBF FAQ
1.How can I place an order for LTC1551CS8-4.1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1551CS8-4.1#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 LTC1551CS8-4.1#TRPBF reliable?
The price and inventory of LTC1551CS8-4.1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1551CS8-4.1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1551CS8-4.1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1551CS8-4.1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1551CS8-4.1#TRPBF?
LTC1551CS8-4.1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1551CS8-4.1#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 LTC1551CS8-4.1#TRPBF?
For technical support, including LTC1551CS8-4.1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1551CS8-4.1#TRPBF requirements.
6.How does Aetrix verify that LTC1551CS8-4.1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1551CS8-4.1#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 LTC1551CS8-4.1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1551CS8-4.1#TRPBF?
All LTC1551CS8-4.1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1551CS8-4.1#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 LTC1551CS8-4.1#TRPBF part is unused and in its original packaging.
Return procedure for LTC1551CS8-4.1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1551CS8-4.1#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…
