MCP1257 Microchip Technology Inc., MCP1257 Datasheet

MCP1257

Manufacturer Part Number

MCP1257

Description

Regulated 3.3v, Low-ripple Charge Pump With Low- Operating Current Sleep Mode Or Bypass Mode

Manufacturer

Microchip Technology Inc.

Datasheet

1.MCP1257.pdf (24 pages)

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Features

• Inductorless 1.5x, 2x Boost DC/DC Converter

• Output Voltage: 3.3V

• High Output Voltage Accuracy:

• Output Current Up To 100 mA

• 20 mV

• Thermal Shutdown and Short Circuit Protection

• Uses Small Ceramic Capacitors

• Switching Frequency: 650 kHz

• Low-Power SLEEP Mode: MCP1256/7

• BYPASS Mode: MCP1258/9

• Low-Power Shutdown Mode: 0.1 μA (Typical)

• Shutdown Input Compatible with 1.8V Logic

• V

• Soft-Start Circuitry to Minimize Inrush Current

• Temperature Range: -40°C to +125°C

• Packaging:

Applications

• Pagers

• Portable Measurement Instruments

• Home Automation Products

• PICmicro

Typical Application

INPUT

1.8V to 3.6V

- ±3.0% (V

- 10-Pin, 3 mm x 3 mm DFN

- 10-Pin, MSOP

Regulated 3.3V, Low-Ripple Charge Pump with Low-

Operating Current SLEEP Mode or BYPASS Mode

Range: 1.8V to 3.6V

10 μF

ON / OFF

Typical Application with Power-Good Indication

Output Voltage Ripple

1 μF

MCU Bias

OUT

Fixed)

SHDN

SLEEP

MCP1256

PGOOD

GND

OUT

1 μF

10 μF

Power-Good

Indication

OUT

OUTPUT

3.3V

MCP1256/7/8/9

Description

The MCP1256, MCP1257, MCP1258 and MCP1259

are inductorless, positive regulated charge pump

DC/DC converters. The devices generate a regulated

3.3V output voltage from a 1.8V to 3.6V input. The

devices are specifically designed for applications

operating from 2-cell alkaline, Ni-Cd, or Ni-MH

batteries or by one primary lithium MnO2 (or similar)

coin cell battery.

The MCP1256, MCP1257, MCP1258 and MCP1259

provide high efficiency by automatically switching

between 1.5x and 2x boost operation. In addition, at

light output loads, the MCP1256 and MCP1257 can be

placed in a SLEEP mode, lowering the quiescent

current while maintaining the regulated output voltage.

Alternatively, the MCP1258 and MCP1259 provide a

BYPASS feature connecting the input voltage to the

output.

microcontrollers or other system devices to remain

biased with virtually no current being consumed by the

MCP1258 or MPC1259.

In normal operation, the output voltage ripple is below

20 mV

tion occurs at a fixed switching frequency of 650 kHz,

avoiding interference with sensitive IF bands.

The MCP1256 and MCP1258 feature a power-good

output that can be used to detect out-of-regulation

conditions. The MCP1257 and MCP1259 feature a low-

battery indication that issues a warning if the input

voltage drops below a preset voltage threshold.

Extremely low supply current and few external parts (4

capacitors) make these devices ideal for small, battery-

powered applications. A Shutdown mode is also

provided for further power reduction.

The devices incorporate thermal and short-circuit pro-

tection. Two package offerings are provided: 10-pin

MSOP and 10-lead 3 mm x 3 mm DFN. The devices

are completely characterized over the junction temper-

ature range of -40°C to +125°C.

at load currents up to 100 mA. Normal opera-

This

allows

for

real-time

DS21989A-page 1

clocks,

Related parts for MCP1257

MCP1257 Summary of contents

Page 1

... The MCP1256, MCP1257, MCP1258 and MCP1259 provide high efficiency by automatically switching between 1.5x and 2x boost operation. In addition, at light output loads, the MCP1256 and MCP1257 can be placed in a SLEEP mode, lowering the quiescent current while maintaining the regulated output voltage. Alternatively, the MCP1258 and MCP1259 provide a BYPASS feature connecting the input voltage to the output ...

Page 2

... OUT Gate Drives S1 S5 S5, S1,S3, S2(CE — MCP1257 10 SHDN 9 GND MCP1259 10 SHDN 9 GND OUT S4 S5 ...

Page 3

... Threshold Thermal Shutdown T J(HYS) Hysteresis © 2006 Microchip Technology Inc. MCP1256/7/8/9 † Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied ...

Page 4

... Electrical Specifications: Unless otherwise indicated, all limits apply for μ mA -40°C to +125°C. Typical values are OUT J Parameters Sym MCP1256 and MCP1257 Devices SLEEP Mode Input - SLEEP SLEEP Input Voltage Low V IL(SLEEP) SLEEP Input Voltage High V IH(SLEEP) SLEEP Input Leakage I LK(SLEEP) Current ...

Page 5

... Internal Oscillator Frequency F OSC Output Voltage Ripple, V RIP Normal Operation V Wake-up Time From T OUT WKUP Shutdown MCP1256 and MCP1257 Output Voltage Ripple, V RIP SLEEP Mode MCP1258 and MCP1259 V Wake-up Time From T OUT WKUP BYPASS TEMPERATURE SPECIFICATIONS Electrical Specifications: Unless otherwise indicated, all limits apply for V ...

Page 6

... OUT 3.0 3.3 1.8 FIGURE 2-6: Voltage ( +25° OUT Mode Transition 2.1 2.4 2.7 3.0 3.3 Input Voltage (V) Efficiency ( ) vs. Supply OUT Mode Transition 2.1 2.4 2.7 3.0 3.3 Input Voltage (V) Efficiency ( ) vs. Supply I = 100 mA OUT Mode Transition 2.1 2.4 2.7 3.0 3.3 Input Voltage (V) Efficiency ( ) vs. Supply © 2006 Microchip Technology Inc. ...

Page 7

... Input Voltage (V) FIGURE 2-8: Output Voltage (V Input Voltage ( 1.8 1.7 1.6 1.5 1.4 1.3 1 Output Current (mA) FIGURE 2-9: Quiescent Supply Current (I ) vs. Output Current ( Normal Mode. Q OUT © 2006 Microchip Technology Inc μ μF, I OUT 1 2 OUT 2.4 2 3. 2.1V IN 1.8 1.6 1.4 1.2 0 110 130 ) vs. FIGURE 2-10: OUT ( ...

Page 8

Page 9

... Output Voltage Ripple vs. Time - Normal 1.5x Mode. 0.20 0.15 0.10 0.05 0.00 -0.05 -0.10 -0.15 -0.20 Time (μs) FIGURE 2-20: Output Voltage Ripple vs. Time - SLEEP Mode. 0.20 0.15 0.10 0.05 0.00 -0.05 -0.10 -0.15 -0.20 Time (μs) FIGURE 2-21: Output Voltage Ripple vs. Time - SLEEP Mode. © 2006 Microchip Technology Inc μ μF, I OUT 1 2 OUT 0. 3. 100 mA OUT 0.10 0.05 0.00 -0.05 -0.10 -0.15 -0. FIGURE 2-22: Time - SLEEP Mode ...

Page 10

... mA, and T OUT 1 2 OUT 0. 0.10 V OUT 0.00 6 -0.10 5 -0. -0. -0.40 2 -0.50 1 -0.60 0 FIGURE 2-27: 8 0.20 7 0.10 V OUT 6 0.00 5 -0.10 4 -0. -0.30 2 -0.40 1 -0.50 0 -0.60 FIGURE 2-28: = +25°C. A 0.20 0.10 0.00 -0. OUT -0.20 -0.30 -0.40 -0.50 -0.60 Time (μs) Line Transient Response. 0.20 0.10 0.00 -0. 100 mA OUT -0.20 -0.30 -0.40 -0.50 -0.60 Time (μs) Line Transient Response. © 2006 Microchip Technology Inc. ...

Page 11

... Function Power-Good Indication Open-Drain Output Pin: MCP1256 and MCP1258 Low-Battery Indication Open-Drain Output Pin: MCP1257 and MCP1259 Active Low SLEEP Mode Input Pin: MCP1256 and MCP1257 Active Low BYPASS Mode Input Pin: MCP1258 and MCP1259 Flying Capacitor Negative Pin Flying Capacitor Positive Pin Regulated 3 ...

Page 12

... All remaining functions of the device are shutdown. BYPASS mode can substantially increase battery run- time in portable applications OUT OUT OUT = ---------------------------------------- - = --------------------- - V 1 1.5 IN OUT OUT OUT OUT = ------------------------------------ = ----------------- - OUT IN © 2006 Microchip Technology Inc. ...

Page 13

... SHDN is low or when BYPASS is low (MCP1258). 4.7 Low-Battery Output (LBO) For the MCP1257/9 devices, the LBO output is an open-drain output that sinks current when the input voltage falls below a preset threshold. If the input volt- age falls below the preset threshold for less than 200 μ ...

Page 14

Page 15

... Note: In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. © 2006 Microchip Technology Inc. MCP1256/7/8/9 Example ...

Page 16

... REF. E .112 .118 .124 E2 .082 .094 .096 D .112 .118 .124 D2 .051 .065 .067 b .008 .010 .015 L .012 .016 .020 K .008 — — BOTTOM VIEW MILLIMETERS* MIN NOM MAX 10 0.50 BSC 0.80 0.90 1.00 0.00 0.02 0.05 0.20 REF. 2.85 3.00 3.15 2.08 2.39 2.45 2.85 3.00 3.15 1.30 1.65 1.70 0.18 0.25 0.30 0.30 0.40 0.50 0.20 — — Revised 09-12-05 © 2006 Microchip Technology Inc. ...

Page 17

... Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010" (0.254 mm) per side. BSC: Basic Dimension. Theoretically exact value shown without tolerances. See ASME Y14.5M REF: Reference Dime n sion, usually witho ut tolerance, for information purposes only. See ASME Y14.5M JEDEC Equivalent: MO-187 BA Drawing No. C04-021 © 2006 Microchip Technology Inc ...

Page 18

Page 19

Page 20

Page 21

... E-Temp, MSOP package d) MCP1256T-EUN: Tape and Reel, E-Temp, MSOP package a) MCP1257-EMF: E-Temp, DFN package b) MCP1257T-EMF: Tape and Reel, E-Temp, DFN package c) MCP1257-EUN: E-Temp, MSOP package d) MCP1257T-EUN: Tape and Reel, E-Temp, MSOP package a) MCP1258-EMF: E-Temp, DFN package b) MCP1258T-EMF: Tape and Reel, E-Temp, DFN package ...

Page 22

Page 23

... Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. © 2006 Microchip Technology Inc. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, K ...

Page 24

... Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2006 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-399 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris ...

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