MAX857 |
RFQ for MAX857 Required Field |
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| Technical/Catalog Information | MAX8570EUT+T |
| Vendor | Maxim Integrated Products |
| Category | Integrated Circuits (ICs) |
| Package / Case | SOT-23-6 |
| Packaging | Tape & Reel (TR) |
| Type | LCD Voltage Regulator |
| Voltage - Input | 2.7 ~ 5.5 V |
| Voltage - Output | 3V ~ 28 V |
| Number of Outputs | 1 |
| Applications | Converter, LCD |
| Operating Temperature | -40°C ~ 85°C |
| Drawing Number | * |
| Lead Free Status | Lead Free |
| RoHS Status | RoHS Compliant |
| Other Names | MAX8570EUT+T MAX8570EUT+T |
| Product | Manufacturers | Pack | D/C |
| MAX857 | Maxim | - | - |
The MAX856MAX859 are high-efficiency, CMOS, step- up, DC-DC switching regulators for small, low input volt- age or battery-powered systems. The MAX856/MAX858 accept a positive input voltage between 0.8V and VOUT and convert it to a higher, pin-selectable output voltage of 3.3V or 5V. The MAX857/MAX859 adjustable versions accept 0.8V to 6.0V input voltages and generate higher adjustable output voltages in the 2.7V to 6.0V range. Typical efficiencies are greater than 85%. Typical quies- cent supply current is 25A (1A in shutdown).
The MAX856MAX859 combine ultra-low quiescent supply current and high efficiency to give maximum battery life. An internal MOSFET power transistor permits high switching frequencies. This benefit, combined with internally set peak inductor current limits, permits the use of small, low-cost inductors. The MAX856/MAX857 have a 500mA peak inductor current limit. The MAX858/MAX859 have a 125mA peak inductor current limit.
Typical Application |
Features |
| 3.3V to 5V Step-Up ConversionPalmtop ComputersPortable Data-Collection EquipmentPersonal Data Communicators/ComputersMedical Instrumentation2-Cell & 3-Cell Battery-Operated EquipmentGlucose Meters | 0.8V to 6.0V Input Supply Voltage0.8V Typ Start-Up Supply Voltage85% Efficiency at 100mA25A Quiescent Current1A Shutdown Mode125mA and 500mA Switch-Current Limits PermitUse of Low-Cost InductorsUp to 500kHz Switching Frequency±1.5% Reference Tolerance Over TemperatureLow-Battery Detector (LBI/LBO)8-Pin SO and MAX Packages |
Supply Voltage (OUT to GND) .....................................-0.3V, +7V
Switch Voltage (LX to GND) ........................................-0.3V, +7V
SHDN , LBO to GND.....................................................-0.3V, +7V
LBI, REF, 3/5, FB to GND .............................-0.3V, (VOUT + 0.3V)
Reference Current (IREF) ..................................................2.5mA
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.88mW/°C above +70°C) .........................471mW
MAX (derate 4.1mW/°C above +70°C) .......................330mW
CERDIP (derate 8.00mW/°C above +70°C) ..................640mW
Reverse Battery Current (TA +45°C, Note 1)...................750mA
Operating Temperature Ranges
MAX85_C_ _ .......................................................0°C to +70°C
MAX85_E_ _ .....................................................-40°C to +85°C
MAX85_MJA ....................................................-55°C to +125°C
Junction Temperature ....................................................+150°C
Storage Temperature Range ..........................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
