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Спецификация NCP1550 изготовлена «ON» и имеет функцию, называемую «600 kHz PWM/PFM Step-Down DC-DC Controller». |
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Детали детали
Номер произв | NCP1550 |
Описание | 600 kHz PWM/PFM Step-Down DC-DC Controller |
Производители | ON |
логотип |
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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
• Pb−Free Packages are Available
• High Efficiency 92%, Typical
• Low Quiescent Bias Current of 50 mA (Typical at PFM Mode with
No Load)
• 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 Pullup 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 Undervoltage Lockout (UVLO) Protection
• Low Profile and Minimum External Components
• Micro Miniature TSOP−5 Package
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
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1
MARKING
DIAGRAM
TSOP−5
SN SUFFIX
CASE 483
xxxYW
xxx = Device Code
Y = Year
W = Work Week
PIN CONNECTIONS
CE 1
5 VIN
GND 2
VOUT 3
4 EXT
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 16 of this data sheet.
© Semiconductor Components Industries, LLC, 2004
September, 2004 − Rev. 6
1
Publication Order Number:
NCP1550/D
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NCP1550
PWM
Controller
VOUT 3
TON t
TON(PFM)
A1
−
+
GND 2
M1
Voltage Reference
and Soft−Start
+
UVLO
−
CP1
2.2 V +−
5 VIN
600 kHz
Oscillator
Driver
4 EXT
1 CE
Figure 1. Simplified Block Diagram
PIN FUNCTION DESCRIPTIONS
Pin Symbol
Description
1 CE Chip Enable pin, active high (internal pullup current source). By connecting this pin to GND, the switching operation
of the controller will be stopped.
2 GND Ground Connection
3
VOUT
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.
4 EXT Gate drive for external P−MOSFET
5 VIN Power supply input
MAXIMUM RATINGS (TA = 25°C unless otherwise noted)
Rating
Symbol
Value
Unit
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
VIN
VCE
VOUT
VEXT
RqJA
−0.3 to 6.0
−0.3 to 6.0
−0.3 to 6.0
−0.3 to 6.0
250
V
V
°C/W
Operating Junction Temperature Range
TJ −40 to +150 °C
Operating Ambient Temperature Range
TA −40 to +85 °C
Storage Temperature Range
Tstg −55 to +150
°C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
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.
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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
Symbol
Min Typ Max Unit
TOTAL DEVICE
Input Voltage
Output Voltage (ILOAD = 0 mA, TA = 25°C)
NCP1550SN18T1
NCP1550SN19T1
NCP1550SN25T1
NCP1550SN27T1
NCP1550SN30T1
NCP1550SN33T1
VIN
VOUT
2.45 − 5.50
1.764 1.8 1.836
1.862 1.9 1.938
2.450 2.5 2.550
2.646 2.7 2.754
2.940 3.0 3.060
3.234 3.3 3.366
V
V
Input Current into VOUT Pin
NCP1550SN18T1
NCP1550SN19T1
NCP1550SN25T1
NCP1550SN27T1
NCP1550SN30T1
NCP1550SN33T1
IVOUT
mA
− 2.5 4.0
− 2.5 4.0
− 2.5 4.0
− 2.5 4.0
− 2.5 4.0
− 2.5 4.0
Temperature Coefficient
Operating Current (VIN = 5.0 V, VCE = 5.0 V, No External Components)
NCP1550SN18T1
NCP1550SN19T1
NCP1550SN25T1
NCP1550SN27T1
NCP1550SN30T1
NCP1550SN33T1
DVOUT/DVT
IDD
−
−
−
−
−
−
−
100 − ppm/°C
50 80
50 80
50 80
50 80
50 80
50 80
mA
Off−State Current (VIN = 5.0 V, VCE = 0 V, TA = 25°C)
NCP1550SN18T1
NCP1550SN19T1
NCP1550SN25T1
NCP1550SN27T1
NCP1550SN30T1
NCP1550SN33T1
IOFF
mA
− 0.3 0.5
− 0.3 0.5
− 0.3 0.5
− 0.3 0.5
− 0.3 0.5
− 0.3 0.5
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)
FOSC
510 600 690
kHz
DFOSC/DTA
−
0.11
−
%/°C
DMAX
100 −
−
%
TON(PFM)
167 320 500
ns
Tss
− 8.0 −
ms
Tprot
− 8.0 −
ms
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
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Номер в каталоге | Описание | Производители |
NCP1550 | 600 kHz PWM/PFM Step-Down DC-DC Controller | ON |
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