MCP1256/7/8/9EV Microchip Technology, MCP1256/7/8/9EV Datasheet - Page 13

• Manufacturer Part Number: MCP1256/7/8/9EV
• Description: BOARD EVAL FOR MCP1256/7/8/9
• Manufacturer: Microchip Technology

Specifications of MCP1256/7/8/9EV

• Main Purpose: DC/DC, Step Up
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 3.3V
• Current - Output: 100mA
• Voltage - Input: 1.6 ~ 3.6V
• Regulator Topology: Buck-Boost
• Frequency - Switching: 650kHz
• Board Type: Fully Populated
• Utilized Ic / Part: MCP1256, MCP1257, MCP1258, MCP1259
• Processor To Be Evaluated: MCP1256/7/8/9
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

© 2006 Microchip Technology Inc.
2.3.2
Driving SHDN low puts the MCP1256/7/8/9 in a low-power Shutdown mode. This
disables the charge-pump switches, oscillator and control logic, reducing the quiescent
current to 0.1 μA (typical). The PGOOD output and LBO are in a high impedance state
during shutdown.
2.3.3
The MCP1256/7 provide a unique SLEEP mode feature. SLEEP mode reduces the
current drawn from the input supply, while maintaining a regulated bias on external
peripherals. SLEEP mode can substantially increase battery run-time in portable
applications.
The regulation control is hysteretic, otherwise referred to as a bang-bang control. The
output is regulated around a fixed reference with some hysteresis. As a result, some
amount of peak-to-peak ripple will be observed at the output independent of load
current. The frequency of the output ripple, however, will be influenced heavily by the
load current and output capacitance.
2.3.4
The MCP1258/9 provide a unique BYPASS mode feature. BYPASS virtually eliminates
the current drawn from the input supply by the device, while maintaining an unregulated
bias on external peripherals. BYPASS connects the input supply voltage to the output.
All remaining functions of the device are shutdown. BYPASS mode can substantially
increase battery run-time in portable applications.
2.3.5
The MCP1256/7/8/9 Charge Pump Evaluation Board supports the entire
MCP1256/7/8/9 family. The MCP1256/7/8/9 Charge Pump Evaluation Board is
provided with two evaluation circuits utilizing the MCP1256 and MCP1259. Alternate
devices can be substituted in order to evaluate the different MCP1256/7/8/9 family
options.
Shutdown Mode (SHDN)
SLEEP Mode (SLEEP)
BYPASS Mode (BYPASS)
Device Support Options
DS51603A-page 9