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Part: NCP1550SN25T1
Category:
Power Management
-> DC-DC Converters
-> DC-DC Switching
-> Converters
Description: up to 2A, 1.8V, 600KHz Buck Pwm/pfm Switching Controller With Enable And Soft-start, Package: SOT-23 / TSOP-5, Pins=5
Company: ON Semiconductor
Datasheet: Download NCP1550SN25T1 datasheet File size : 161 kB
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Datasheet text preview:
NCP1550 600 kHz PWM/PFM Step-Down DC-DC Controller
The NCP1550 is a monolithic micropower high frequency voltage mode step-down controller IC, specially designed for battery operated hand-held electronic products. With appropriate external P-type MOSFET, the device can provide up to 2.0 A loading current with high conversion efficiency. The device operates in Constant-Frequency PWM mode at normal operation, that ensures low output ripple noise, and which will automatically switch to PFM mode at low output loads for higher efficiency. Additionally, value-added features of Chip Enable to reduce IC Off-State current and integrated feedback resistor network, make it the best choice for portable applications. The device is designed to operate for voltage regulation with minimum external components and board space. This device is available in a TSOP-5 package with six standard output voltage options.
Features http://onsemi.com MARKING DIAGRAM
5 1 TSOP-5 SN SUFFIX CASE 483 xxxYW
xxx = Device Code Y = Year W = Work Week
· High Efficiency 92%, Typical · Low Quiescent Bias Current of 50 mA (Typical at PFM Mode with · Output Voltage Options from 1.8 V to 3.3 V with High Accuracy · · · · · · · · · · · · · · · · ·
$2.0% Low Output Voltage Ripple, 50 mV, Typical PWM Switching Frequency at 600 kHz Automatic PWM/PFM Switchover at Light Load Condition Very Low Dropout Operation, 100% Max. Duty Cycle Chip Enable Pin with On-Chip 150 nA Pull-Up Current Source Low Shutdown Current, 0.3 mA, Typical Input Voltage Range from 2.45 V to 5.5 V Built-in Soft-Start Internal Under-Voltage Lockout (UVLO) Protection Low Profile and Minimum External Components Micro Miniature TSOP-5 Package No Load)
PIN CONNECTIONS
CE GND VOUT 1 2 3 (Top View) 4 EXT 5 VIN
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 16 of this data sheet.
Typical Applications
Personal Digital Assistant (PDA) Camcorders and Digital Still Camera Hand-Held Instrument Distributed Power System Computer Peripheral Conversion from Four NiMH or NiCd or One Lithium-ion Cells to 3.3 V/1.8 V
© Semiconductor Components Industries, LLC, 2003
1
July, 2003 - Rev. 4
Publication Order Number: NCP1550/D
NCP1550
+ CP1 PWM Controller -
UVLO 5 VIN
2.2 V
+ -
VOUT
3 A1 - +
TON t TON(PFM)
600 kHz Oscillator
Driver
4
EXT
Voltage Reference and Soft-Start GND 2 M1
1
CE
Figure 1. Simplified Block Diagram PIN FUNCTION DESCRIPTIONS
Pin 1 2 3 Symbol CE GND VOUT Description Chip Enable pin, active high (internal pull-up current source). By connecting this pin to GND, the switching operation of the controller will be stopped. Ground Connection Output voltage monitoring input. This pin must be connected to the regulated output node as a feedback to on-chip control circuitry. VOUT is internally connected to the on-chip voltage divider that determines the output voltage level. Gate drive for external P-MOSFET Power supply input
4 5
EXT VIN
MAXIMUM RATINGS (TA = 25°C unless otherwise noted)
Rating Device Power Supply, VIN (Pin 5) Input/Output Pins CE (Pin 1) VOUT (Pin 3) EXT (Pin 4) Thermal Characteristics TSOP-5 Plastic Package, Case 483-01 Thermal Resistance, Junction-to-Air Operating Junction Temperature Range Operating Ambient Temperature Range Storage Temperature Range NOTE: ESD data available upon request. 1. This device series contains ESD protection and exceeds the following tests: Human Body Model (HBM) $2.0 kV per JEDEC standard: JESD22-A114. Machine Model (MM) $200V per JEDEC standard: JESD22-A115. 2. Latchup Current Maximum Rating: 150 mA per JEDEC standard: JESD78. 3. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J-STD-020A. Symbol VIN VCE VOUT VEXT Rq J A Value -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 250 °C/W Unit V V
TJ TA Tstg
-40 to +150 -40 to +85 -55 to +150
°C °C °C
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NCP1550
ELECTRICAL CHARACTERISTICS (VIN = 5.0 V, TA = 25°C for typical value, -40°C v TA v 85°C for min/max values unless
otherwise noted.) Characteristic TOTAL DEVICE Input Voltage Output Voltage (ILOAD = 0 mA, TA = 25°C) NCP1550SN18T1 NCP1550SN19T1 NCP1550SN25T1 NCP1550SN27T1 NCP1550SN30T1 NCP1550SN33T1 Input Current into VOUT Pin NCP1550SN18T1 NCP1550SN19T1 NCP1550SN25T1 NCP1550SN27T1 NCP1550SN30T1 NCP1550SN33T1 Temperature Coefficient Operating Current (VIN = 5.0 V, VCE = 5.0 V, No External Components) NCP1550SN18T1 NCP1550SN19T1 NCP1550SN25T1 NCP1550SN27T1 NCP1550SN30T1 NCP1550SN33T1 Off-State Current (VIN = 5.0 V, VCE = 0 V, TA = 25°C) NCP1550SN18T1 NCP1550SN19T1 NCP1550SN25T1 NCP1550SN27T1 NCP1550SN30T1 NCP1550SN33T1 OSCILLATOR Frequency Frequency Temperature Coefficient (TA = -40°C to 85°C) Maximum Duty Cycle PWM/PFM Switchover ON Time Threshold (Note 4) Soft-Start Delay Time (Note 4) Protection Delay Time (Auto Restart) OUTPUT DRIVE (PIN 4) EXT "H" Output Current (VEXT = VIN 0.4 V) EXT "L" Output Current (VEXT = 0.4 V) EXT "L-H" Rise Time (CLOAD = 1000 pF) (VIN = 5.0 V) EXT "H-L" Fall Time (CLOAD = 1000 pF) (VIN = 5.0 V) EXT "L-H" Rise Time (CLOAD = 5.0 nF) (VIN = 5.0 V) EXT "H-L" Fall Time (CLOAD = 5.0 nF) (VIN = 5.0 V) 4. PWM/PFM Switchover ON Time Threshold min/max guaranteed by design only. IEXTH IEXTL Tr Tf Tr Tf - - - - - - -60 100 65 40 140 90 - - - - - - mA mA ns ns ns ns FOSC DFOSC/DTA DM A X TON(PFM) Tss Tprot 510 - 100 167 - - 600 0.11 - 320 8.0 8.0 690 - - 500 - - kHz %/°C % ns ms ms VIN VOUT 1.764 1.862 2.450 2.646 2.940 3.234 IVOUT - - - - - - DVOUT/DVT IDD - - - - - - IOFF - - - - - - 0.3 0.3 0.3 0.3 0.3 0.3 0.5 0.5 0.5 0.5 0.5 0.5 50 50 50 50 50 50 80 80 80 80 80 80 mA - 2.5 2.5 2.5 2.5 2.5 2.5 100 4.0 4.0 4.0 4.0 4.0 4.0 - ppm/°C mA 1.8 1.9 2.5 2.7 3.0 3.3 1.836 1.938 2.550 2.754 3.060 3.366 mA 2.45 - 5.50 V V Symbol Min Typ Max Unit
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