Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump MAX1595 charge-

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Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump MAX1595 charge-

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19-2107; 8/02
Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump
MAX1595 charge-pump regulator generates either 3.3V from 1.8V 5.5V input. unique control architecture allows regulator step step down input voltage maintain output regulation. 1MHz switching frequency, combined with unique control scheme, allows ceramic capacitor small 125mA output current. complete regulator requires three external capacitors-no inductor needed. MAX1595 specifically designed serve high-power, highefficiency auxiliary supply applications that demand compact design. MAX1595 offered spacesaving 8-pin µMAX high-power 12-pin thin packages.
Features
Ultra-Small: Requires Only Three Ceramic Capacitors Inductors Required 125mA Output Current Regulated Output Voltage 1MHz Switching Frequency 1.8V 5.5V Input Voltage 220µA Quiescent Current 0.1µA Shutdown Current Load Disconnect Shutdown
MAX1595
Applications
White Power Flash Memory Supplies Battery-Powered Applications Miniature Equipment PCMCIA Cards 3.3V Local Conversion Applications Backup-Battery Boost Converters SIMM Cards
PART MAX1595EUA33 MAX1595ETC33 MAX1595EUA50 PART MAX1595EUA33 MAX1595ETC33 MAX1595EUA50 MAX1595ETC50
Ordering Information
TEMP RANGE -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C PIN-PACKAGE µMAX Thin µMAX Thin
Selector Guide
VOUT 3.3V 3.3V 5.0V MARK AAAP
Typical Operating Circuit
MAX1595ETC50 AAAM 5.0V *Contact factory other fixed-output voltages from 2.7V 5.0V.
Configurations
INPUT
MAX1595
AOUT SHDN PGND OUTPUT
VIEW
AOUT SHDN PGND
MAX1595
µMAX
Configurations continued data sheet. Maxim Integrated Products
pricing delivery, ordering information please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump MAX1595
ABSOLUTE MAXIMUM RATINGS
OUT, AOUT GND.-0.3V SHDN PGND .-0.3V PGND .-0.3V +0.3V PGND.-0.3V (Lower 0.8V 6.3V) .-0.8V (Higher 0.8V 0.8V greater than Continuous Output Current .150mA Continuous Power Dissipation +70°C) 8-Pin µMAX (derate 4.5mW/°C above +70°C) .362mW 12-Pin Thin (derate 18.5mW/°C above +70°C).1481mW Operating Temperature Range .-40°C +85°C Junction Temperature .+150°C Storage Temperature Range .-65°C +150°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN MAX1595_ _33, MAX1595_ _50, 1µF, 0.22µF, COUT 1µF, -40° +85°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER Input Voltage Range Input Undervoltage Lockout Threshold Input Undervoltage Lockout Hysteresis ILOAD 125mA, +3.0V Output Voltage VOUT +85°C -40°C +85°C 4.85 4.80 3.20 3.16 3.20 3.16 0.85 3.33 3.33 SYMBOL CONDITIONS 1.40 1.60 5.05 5.15 5.20 3.40 3.44 3.40 3.44 1.15 1.72 UNITS
ILOAD 75mA, +85°C +2.0V -40°C +85°C ILOAD 30mA, +85°C +1.8V -40°C +85°C
No-Load Input Current Switching Frequency Shutdown Supply Current SHDN Input Voltage SHDN Input Voltage High SHDN Input Leakage Current
fOSC SHDN VINL VINH
+2.0V, MAX1595_ +3.0V, MAX1595_ ILOAD 20mA, VOUT SHDN +5.5V, VOUT 2.0V 5.5V 2.0V 5.5V
Note Specifications -40°C guaranteed design, production tested.
Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump
_Typical Operating Characteristics
(Circuit Figure MAX1595_ _33, MAX1595_ _50, +25°C, unless otherwise noted.)
LOAD SUPPLY CURRENT SUPPLY VOLTAGE
MAX1595 toc01
MAX1595
OUTPUT WAVEFORM
MAX1595 toc02
OUTPUT VOLTAGE LOAD CURRENT
5.04 OUTPUT VOLTAGE 5.02 5.00 4.98 4.96 4.94 4.92 3.3V 3.6V
MAX1595 toc03
10000
5.06
1000 SUPPLY CURRENT (µA)
VOUT VOUT
50mV/div
SUPPLY VOLTAGE
4.90 200ns/div OUTPUT WAVEFORM. AC-COUPLED. 3.6V, ILOAD 100mA, COUT LOAD CURRENT (mA)
VOUT 1000
EFFICIENCY LOAD CURRENT
EFFICIENCY LOAD CURRENT (mA) 2.4V 1.8V
MAX1595 toc04
EFFICIENCY LOAD CURRENT
EFFICEINCY
MAX1595 toc05
SHUTDOWN TIMING
MAX1595 toc06
1000 LOAD CURRENT (mA) 100µs/div OUTPUT VOLTAGE: 100, 2V/div SHDN VOLTAGE: 2V/div 3.6V 3.3V
LINE-TRANSIENT RESPONSE
MAX1595 toc07
LOAD-TRANSIENT RESPONSE
MAX1595 toc08
OUTPUT VOLTAGE SUPPLY VOLTAGE
VOUT ILOAD 125mA
MAX1595 toc09
OUTPUT VOLTAGE COUT 2ms/div INPUT VOLTAGE: 3.1V 3.6V, 500mV/div OUTPUT VOLTAGE: ILOAD 50mA, 100mV/div 200µs/div LOAD CURRENT: ILOAD 95mA, 100mA/div OUTPUT VOLTAGE: AC-COUPLED 100mV/div SUPPLY VOLTAGE VOUT 3.3V, ILOAD 75mA
Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump MAX1595
Description
MAX1595 µMAX MAX1595 THIN NAME FUNCTION
AOUT SHDN PGND
Analog Power Sense Input Error Amplifier/Comparator. Connect output filter capacitor. Shutdown Input. When SHDN low, device turns off; when SHDN high, device activates. shutdown, disconnected from Input Supply. range from 1.8V 5.5V. Bypass with capacitor. Ground Power Ground Negative Terminal Charge-Pump Transfer Capacitor Positive Terminal Charge-Pump Transfer Capacitor Output. Bypass with output capacitor filter.
Detailed Description
MAX1595 charge pump provides either 3.3V regulated output. delivers maximum 125mA load current. addition, boost regulating from lower supply, also capable buck regulating from supplies that exceed regulated output diode drop more. Designed specifically compact applications, complete regulator circuit requires only three small external capacitors. innovative control scheme provides constant frequency operation from medium heavy loads, while smoothly transitioning low-power mode light loads maintain optimum efficiency. buck mode, switch Figure switched continuously while switch alternates between OUT. amount charge proportional difference between output voltage supply voltage stored which gets transferred output when regulation point reached. Maximum output ripple proportional difference between supply voltage output voltage, well ratio transfer capacitor (CX) output capacitor (COUT). MAX1595 consists error amplifier, 1.23V bandgap reference, internal resistive feedback network, oscillator, high-current MOSFET switches, shutdown control logic. Figure shows idealized unregulated charge-pump voltage doubler. oscillator runs duty cycle. During half period, transfer capacitor (CX) charges input voltage. During other half, doubler transfers input voltage output filter capacitor (COUT). Rather than doubling input voltage, MAX1595 provides regulated output voltage either 3.3V 5.0V.
COUT
Figure Unregulated Voltage Doubler
Shutdown
Driving SHDN places device shutdown mode. device draws 0.1µA supply current this mode. When driven high, MAX1595 enters soft-start mode. Soft-start mode terminates when output voltage regulates, after 2ms, whichever comes first. shutdown, output disconnects from input.
Undervoltage Lockout
MAX1595 undervoltage-lockout that deactivates devices when input voltage falls below 1.6V. Below UVLO, hysteresis holds device shutdown until input voltage rises 40mV above lockout threshold.
Applications Information
Using white LEDs backlight LCDs increasingly popular approach portable information devices (Figure Because forward voltage white LEDs
Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump MAX1595
exceeds available battery voltage, charge pump such MAX1595 provides high efficiency, small size, constant light output with changing battery voltages. output used only light LEDs, output capacitor greatly reduced. frequency modulation intensity discernible human eye, smaller capacitor saves both size cost. Adding Schottky diodes capacitors implements tripler allows MAX1595_ regulate current 75mA with supply voltage 2.3V (Figure
0.1µF
MAX1595_
AOUT SHDN PGND COUT 0.47µF
Capacitor Selection
MAX1595 requires only three external capacitors (Figure Their values closely linked output current capacity, oscillator frequency, output noise content, mode operation. Generally, transfer capacitor (CX) will smallest, input capacitor (CIN) twice large Higher switching frequencies allow smaller CIN. output capacitor (COUT) anywhere from 5-times 50-times larger than Table shows recommended capacitor values. addition, following equation approximates output ripple: VRIPPLE IOUT fOSC COUT) Table lists manufacturers recommended capacitors. Ceramic capacitors will provide lowest ripple their typically lower ESR.
Figure White Bias Supply
INPUT 2.3V
SHDN
AOUT 0.22µF OUTPUT REGULATED 75mA
MAX1595_
0.22µF PGND
Power Dissipation
power dissipated MAX1595 depends output current accurately described PDISS IOUT (2VIN VOUT) PDISS must less than that allowed package rating.
Figure Regulated Voltage Tripler
Layout Considerations
capacitors should soldered close proximity Connect ground power ground through short, low-impedance trace. input supply trace should short possible. Otherwise, additional input supply filter capacitor (tantalum electrolytic) required.
SHDN
PGND
COUT 0.22µF
MAX1595
AOUT
Figure Standard Operating Circuit
Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump MAX1595
Table Recommended Capacitor Values
OUTPUT RIPPLE (mV) (µF) (µF) 0.22 0.47 COUT (µF)
Table Recommended Capacitor Manufacturers
VALUE (µF) 0.22 0.47 VOLTAGE TYPE SIZE 0805 0603 0603 0603 MANUFACTURER Taiyo Yuden Taiyo Yuden Taiyo Yuden Taiyo Yuden PART LMK212BJ105MG LMK107BJ224MA LMK107BJ474MA LMK107BJ104MA
Configurations (continued)
VIEW
AOUT SHDN
Chip Information
TRANSISTOR COUNT: 1370
MAX1595
PGND
PGND
THIN
Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information, www.maxim-ic.com/packages.)
8LUMAXD.EPS
MAX1595
INCHES 0.002 0.030 0.043 0.006 0.037
MILLIMETERS 0.05 0.75 1.10 0.15 0.95
0.50±0.1 0.6±0.1
0.6±0.1
BOTTOM VIEW
0.014 0.010 0.007 0.005 0.120 0.116 0.0256 0.120 0.116 0.198 0.188 0.026 0.016 0.0207
0.25 0.36 0.13 0.18 2.95 3.05 0.65 2.95 3.05 4.78 5.03 0.41 0.66 0.5250
VIEW
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, uMAX/uSOP
APPROVAL DOCUMENT CONTROL REV.
21-0036
Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump MAX1595
Package Information (continued)
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information, www.maxim-ic.com/packages.)
PACKAGE OUTLINE 12,16,20,24L THIN, 4x4x0.8
21-0139
PACKAGE OUTLINE 12,16,20,24L THIN, 4x4x0.8
21-0139
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2002 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump MAX1595 charge-

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