Data Sheet

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© Semiconductor Components Industries, LLC, 2007

May, 2007 - Rev. 8

1 Publication Order Number:

NCP1402/D

NCP1402

200 mA, PFM Step-Up

Micropower Switching

Regulator

The NCP1402 series are monolithic micropower step-up DC to DC

converter that are specially designed for powering portable equipment

from one or two cell battery packs.These devices are designed to

startup with a cell voltage of 0.8 V and operate down to less than

0.3V. With only three external components, this series allow a simple

means to implement highly efficient converters that are capable of up

to 200 mA of output current at V

= 2.0 V, V

OUT

= 3.0 V.

Each device consists of an on-chip PFM (Pulse Frequency

Modulation) oscillator, PFM controller, PFM comparator, soft-start,

voltage reference, feedback resistors, driver, and power MOSFET

switch with current limit protection. Additionally, a chip enable

feature is provided to power down the converter for extended battery

life.

The NCP1402 device series are available in the Thin SOT-23-5

package with five standard regulated output voltages. Additional

voltages that range from 1.8 V to 5.0 V in 100 mV steps can be

manufactured.

Features

•Extremely Low Startup Voltage of 0.8 V

•Operation Down to Less than 0.3 V

•High Efficiency 85% (V

= 2.0 V, V

OUT

= 3.0 V, 70 mA)

•Low Operating Current of 30 A (V

OUT

= 1.9 V)

•Output Voltage Accuracy ± 2.5%

•Low Converter Ripple with Typical 30 mV

•Only Three External Components Are Required

•Chip Enable Power Down Capability for Extended Battery Life

•Micro Miniature Thin SOT-23-5 Packages

•Pb-Free Packages are Available

Typical Applications

•Cellular Telephones

•Pagers

•Personal Digital Assistants (PDA)

•Electronic Games

•Portable Audio (MP3)

•Camcorders

•Digital Cameras

•Handheld Instruments

ORDERING INFORMATION

SOT23-5

(TSOP-5, SC59-5)

SN SUFFIX

CASE 483

PIN CONNECTIONS AND

MARKING DIAGRAM

GND

OUT

(Top View)

xxx = Marking

A = Assembly Location

Y = Year

W = Work Week

G = Pb-Free Package

See detailed ordering and shipping information in the ordering

information section on page 18 of this data sheet.

http://onsemi.com

xxxAYW G

(Note: Microdot may be in either location)

Summary of content (19 pages)

PAGE 1
NCP1402 200 mA, PFM Step-Up Micropower Switching Regulator The NCP1402 series are monolithic micropower step-up DC to DC converter that are specially designed for powering portable equipment from one or two cell battery packs.These devices are designed to startup with a cell voltage of 0.8 V and operate down to less than 0.3 V. With only three external components, this series allow a simple means to implement highly efficient converters that are capable of up to 200 mA of output current at Vin = 2.
PAGE 2
NCP1402 Vin VOUT CE LX 1 OUT NCP1402 2 NC 5 GND 3 4 Figure 1. Typical Step-Up Converter Application OUT 2 LX 5 VLX LIMITER DRIVER + NC 3 PFM COMPARATOR POWER SWITCH PFM CONTROLLER VOLTAGE REFERENCE SOFT-ST ART PFM OSCILLATOR GND 4 1 CE Figure 2. Representative Block Diagram PIN FUNCTION DESCRIPTIONS Pin # Symbol 1 CE 2 OUT 3 NC 4 GND 5 LX Pin Description Chip Enable pin (1) The chip is enabled if a voltage which is equal to or greater than 0.
PAGE 3
NCP1402 ABSOLUTE MAXIMUM RATINGS Rating Symbol Value Unit VOUT 6.0 V Input/Output Pins LX (Pin 5) LX Peak Sink Current VLX ILX -0.3 to 6.0 400 V mA CE (Pin 1) Input Voltage Range Input Current Range VCE ICE -0.3 to 6.
PAGE 4
NCP1402 ELECTRICAL CHARACTERISTICS (For all values TA = 25°C, unless otherwise noted.) Characteristic Symbol Min Typ Max Unit Switch On Time (current limit not asserted) ton 3.6 5.5 7.6 s Switch Minimum Off Time toff 1.0 1.45 1.9 s Maximum Duty Cycle DMAX 70 78 85 % Minimum Startup Voltage (IO = 0 mA) Vstart - 0.8 0.95 V Vstart - -1.6 - mV/°C Vhold 0.3 - - V tSS 0.3 2.0 - ms Internal Switching N-Channel FET Drain Voltage VLX - - 6.
PAGE 5
NCP1402 4.0 NCP1402SN19T1 L = 47 H TA = 25°C 2.0 VOUT, OUTPUT VOLTAGE (V) VOUT, OUTPUT VOLTAGE (V) 2.1 1.9 Vin = 1.5 V Vin = 0.9 V 1.8 Vin = 1.2 V 1.7 1.6 0 20 40 60 80 Vin = 2.5 V 3.0 Vin = 0.9 V 2.5 Vin = 1.5 V Vin = 1.2 V 2.0 0 20 40 60 80 100 120 140 160 180 200 IO, OUTPUT CURRENT (mA) Figure 3. NCP1402SN19T1 Output Voltage vs. Output Current Figure 4. NCP1402SN30T1 Output Voltage vs. Output Current 100 Vin = 4.0 V 80 Vin = 1.5 V Vin = 1.2 V 4.0 EFFICIENCY (%) 5.0 Vin = 2.
PAGE 6
NCP1402 3.2 VOUT, OUTPUT VOLTAGE (V) VOUT, OUTPUT VOLTAGE (V) 2.1 2.0 1.9 1.8 1.7 NCP1402SN19T1 VOUT = 1.9 V x 0.96 Open-Loop Test 1.6 -50 -25 0 25 50 75 3.0 2.9 2.8 NCP1402SN30T1 VOUT = 3.0 V x 0.96 Open-Loop Test 2.7 -50 100 -25 25 50 75 100 TEMPERATURE (°C) Figure 9. NCP1402SN19T1 Output Voltage vs. Temperature Figure 10. NCP1402SN30T1 Output Voltage vs. Temperature 100 5.1 IDD1, OPERATING CURRENT 1 (mA) NCP1402SN50T1 VOUT = 5.0 V x 0.96 Open-Loop Test 5.0 4.9 4.8 4.
PAGE 7
NCP1402 7.5 ton, SWITCH ON TIME ( s) ton, SWITCH ON TIME ( s) 7.5 7.0 6.5 6.0 5.5 5.0 -50 NCP1402SN19T1 VOUT = 1.9 V x 0.96 Open-Loop Test -25 0 25 50 75 -25 0 25 50 75 Figure 16. NCP1402SN30T1 Switch On Time vs. Temperature toff, MINIMUM SWITCH OFF TIME ( s) NCP1402SN50T1 VOUT = 5.0 V x 0.96 Open-Loop Test -25 0 25 50 75 100 1.8 1.7 1.6 1.5 1.4 -50 NCP1402SN19T1 VOUT = 1.9 V x 0.96 Open-Loop Test -25 0 25 50 75 TEMPERATURE (°C) Figure 17.
PAGE 8
NCP1402 100 DMAX, MAXIMUM DUTY CYCLE (%) DMAX, MAXIMUM DUTY CYCLE (%) 100 90 80 70 60 50 40 -50 NCP1402SN19T1 VOUT = 1.9 V x 0.96 Open-Loop Test -25 0 25 50 75 NCP1402SN30T1 VOUT = 3.0 V x 0.96 Open-Loop Test -25 0 25 50 75 Figure 22. NCP1402SN30T1 Maximum Duty Cycle vs. Temperature ILX, LX PIN ON-STATE CURRENT (mA) 60 NCP1402SN50T1 VOUT = 5.0 V x 0.96 Open-Loop Test -25 0 25 50 75 100 180 160 140 120 100 -50 NCP1402SN19T1 VOUT = 1.9 V x 0.96 VLX = 0.
PAGE 9
NCP1402 1.0 VLXLIM, VLX VOLTAGE LIMIT (V) VLXLIM, VLX VOLTAGE LIMIT (V) 1.0 0.8 0.6 0.4 0.2 NCP1402SN19T1 Open-Loop Test 0.0 -50 -25 0 25 50 75 NCP1402SN30T1 Open-Loop Test -25 0 25 50 75 100 Figure 27. NCP1402SN19T1 VLX Voltage Limit vs. Temperature Figure 28. NCP1402SN30T1 VLX Voltage Limit vs. Temperature RDS(on), SWITCH-ON RESISTANCE ( ) 0.4 0.2 NCP1402SN50T1 Open-Loop Test -25 0 25 50 75 100 4.0 3.5 3.0 2.5 2.0 1.5 1.0 -50 NCP1402SN19T1 VOUT = 1.9 V x 0.96 VLX = 0.
PAGE 10
Vstart 0.8 NCP1402SN19T1 L = 22 H COUT = 10 F IO = 0 mA 0.4 0.2 Vhold 0.0 -50 -25 0 25 50 75 100 NCP1402SN50T1 L = 22 H COUT = 10 F IO = 0 mA Vhold 0.2 0 -25 25 50 75 100 0.4 0.2 Vhold 0.0 -50 -25 0 25 50 75 100 2.0 1.5 Vstart 1.0 Vhold NCP1402SN19T1 L = 47 H COUT = 68 F TA = 25°C 0.5 0.0 0 10 20 30 40 50 60 70 80 90 100 TEMPERATURE (°C) IO, OUTPUT CURRENT (mA) Figure 35. NCP1402SN50T1 Startup/Hold Voltage vs. Temperature Figure 36.
PAGE 11
NCP1402 5 s/div VOUT = 1.9 V, Vin = 1.2 V, IO = 30 mA, L = 47 H, COUT = 68 F 1. VLX, 1.0 V/div 2. VOUT, 20 mV/div, AC coupled 3. IL, 100 mA/div 5 s/div VOUT = 1.9 V, Vin = 1.2 V, IO = 70 mA, L = 47 H, COUT = 68 F 1. VLX, 1.0 V/div 2. VOUT, 20 mV/div, AC coupled 3. IL, 100 mA/div Figure 39. NCP1402SN19T1 Operating Waveforms (Medium Load) Figure 40. NCP1402SN19T1 Operating Waveforms (Heavy Load) 2 s/div VOUT = 3.0 V, Vin = 1.2 V, IO = 30 mA, L = 47 H, COUT = 68 F 1. VLX, 2.0 V/div 2.
PAGE 12
NCP1402 Vin = 1.2 V, L = 47 H, COUT = 68 F 1. VOUT = 1.9 V (AC coupled), 100 mV/div 2. IO = 0.1 mA to 80 mA Vin = 1.2 V, L = 47 H, COUT = 68 F 1. VOUT = 1.9 V (AC coupled), 100 mV/div 2. IO = 80 mA to 0.1 mA Figure 45. NCP1402SN19T1 Load Transient Response Figure 46. NCP1402SN19T1 Load Transient Response Vin = 1.5 V, L = 47 H, COUT = 68 F 1. VOUT = 3.0 V (AC coupled), 100 mV/div 2. IO = 0.1 mA to 80 mA Vin = 1.5 V, L = 47 H, COUT = 68 F 1. VOUT = 3.0 V (AC coupled), 100 mV/div 2.
PAGE 13
NCP1402 100 NCP1402SN19T1 L = 47 H COUT = 68 F TA = 25°C 80 Vripple, RIPPLE VOLTAGE (mV) Vripple, RIPPLE VOLTAGE (mV) 100 60 40 Vin = 1.2 V Vin = 1.5 V 20 NCP1402SN30T1 L = 47 H COUT = 68 F TA = 25°C 80 Vin = 2.0 V 60 Vin = 0.9 V Vin = 1.2 V Vin = 1.5 V 40 Vin = 2.5 V 20 Vin = 0.9 V 0 0 0 20 40 60 80 100 120 140 160 180 200 0 60 80 100 120 140 160 180 200 IO, OUTPUT CURRENT (mA) Figure 51. NCP1402SN19T1 Ripple Voltage vs. Output Current Figure 52.
PAGE 14
150 IO(max), MAX. OUTPUT CURRENT (mA) Iin(no load), NO LOAD INPUT CURRENT ( A) NCP1402 NCP1402SNXXT1 L = 47 H IO = 0 mA TA = 25°C 5.0 V 125 100 3.3 V 75 3.0 V 50 2.7 V 25 1.9 V 0 0 1 2 3 4 5 6 400 3.3 V 5.0 V 3.0 V 300 2.7 V 200 1.9 V 100 NCP1402SNXXT1 L = 47 H TA = 25°C 0 1 0 2 3 4 Vin, INPUT VOLTAGE (V) Vin, INPUT VOLTAGE (V) Figure 57. NCP1402SNXXT1 No Load Input Current vs. Input Voltage Figure 58. NCP1402SNXXT1 Maximum Output Current vs.
PAGE 15
NCP1402 APPLICATIONS CIRCUIT INFORMATION L1 Vin C1 10 F CE D1 47 H 1 OUT NCP1402 2 NC LX 5 VOUT C2 68 F GND 3 4 Figure 59. Typical Application Circuit Step-up Converter Design Equations enough to maintain low ripple. Low inductance values supply higher output current, but also increase the ripple and reduce efficiency. Note that values below 27 H is not recommended due to NCP1402 switch limitations. Higher inductor values reduce ripple and improve efficiency, but also limit output current.
PAGE 16
NCP1402 Output Capacitor An evaluation board of NCP1402 has been made in the size of 23 mm x 20 mm only, as shown in Figures 60 and 61. Please contact your ON Semiconductor representative for availability. The evaluation board schematic diagram, the artwork and the silkscreen of the surface mount PCB are shown below: The output capacitor is used for sustaining the output voltage when the internal MOSFET is switched on and smoothing the ripple voltage.
PAGE 17
NCP1402 Components Supplier Supplier Part Number Inductor, L1 Parts Sumida Electric Co. Ltd. CD54-470L Schottky Diode, D1 ON Semiconductor Corp. MBR0520LT1 Description Phone Inductor 47 H / 0.72 A (852)-2880-6688 Schottky Power Rectifier (852)-2689-0088 (852)-2305-1 168 (852)-2305-1 168 Output Capacitor, C2 KEMET Electronics Corp. T494D686K010AS Low ESR Tantalum Capacitor 68 F / 10 V Input Capacitor, C1 KEMET Electronics Corp.
PAGE 18
NCP1402 ORDERING INFORMATION Device Output Voltage Device Marking Package NCP1402SN19T1 1.9 V DAU SOT23-5 NCP1402SN19T1G 1.9 V DAU SOT23-5 (Pb-Free) NCP1402SN27T1 2.7 V DAE SOT23-5 NCP1402SN27T1G 2.7 V DAE SOT23-5 (Pb-Free) NCP1402SN30T1 3.0 V DAF SOT23-5 NCP1402SN30T1G 3.0 V DAF SOT23-5 (Pb-Free) NCP1402SN33T1 3.3 V DAG SOT23-5 NCP1402SN33T1G 3.3 V DAG SOT23-5 (Pb-Free) NCP1402SN40T1 4.0 V DCR SOT23-5 NCP1402SN40T1G 4.0 V DCR SOT23-5 (Pb-Free) NCP1402SN50T1 5.
PAGE 19
NCP1402 PACKAGE DIMENSIONS SOT23-5 (TSOP-5, SC59-5) SN SUFFIX CASE 483-02 ISSUE G NOTE 5 2X 0.10 T 2X 0.20 T NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. 4. DIMENSIONS A AND B DO NOT INCLUDE MOLD FLASH, PROTRUSIONS, OR GATE BURRS. 5. OPTIONAL CONSTRUCTION: AN ADDITIONAL TRIMMED LEAD IS ALLOWED IN THIS LOCATION.