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NCP1550SN25T1

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 8
1 Publication Order Number:
NCP1550/D
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
• 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
• Pb−Free Packages are Available
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
TSOP−5
SN SUFFIX
CASE 483
MARKING DIAGRAM
xxx = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
1
5
xxxAYW G
G
PIN CONNECTIONS
CE
GND
V
OUT
V
IN
EXT
(Top View)
See detailed ordering and shipping information in the package
dimensions section on page 16 of this data sheet.
ORDERING INFORMATION
1
2
3
4
5
http://onsemi.com
(Note: Microdot may be in either location)
1
NCP1550
http://onsemi.com
2
V
OUT
3
GND
2
M1
+
−
Voltage Reference
and Soft−Start
A1
T
ON
t
T
ON(PFM)
PWM
Controller
Driver
600 kHz
Oscillator
4
1
EXT
CE
+
−
CP1
2.2 V
+
−
UVLO
5
V
IN
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 V
OUT
Output voltage monitoring input. This pin must be connected to the regulated output node as a feedback to on−chip
control circuitry. V
OUT
is internally connected to the on−chip voltage divider that determines the output voltage level.
4 EXT Gate drive for external P−MOSFET
5 V
IN
Power supply input
MAXIMUM RATINGS (T
A
= 25°C unless otherwise noted)
Rating Symbol Value Unit
Device Power Supply, V
IN
(Pin 5) V
IN
−0.3 to 6.0 V
Input/Output Pins
CE (Pin 1)
V
OUT
(Pin 3)
EXT (Pin 4)
V
CE
V
OUT
V
EXT
−0.3 to 6.0
−0.3 to 6.0
−0.3 to 6.0
V
Thermal Characteristics
TSOP−5 Plastic Package, Case 483−01
Thermal Resistance, Junction−to−Air
R
q
JA
250 °C/W
Operating Junction Temperature Range T
J
−40 to +150 °C
Operating Ambient Temperature Range T
A
−40 to +85 °C
Storage Temperature Range T
stg
−55 to +150 °C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
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.
NCP1550
http://onsemi.com
3
ELECTRICAL CHARACTERISTICS (V
IN
= 5.0 V, T
A
= 25°C for typical value, −40°C v T
A
v 85°C for min/max values unless
otherwise noted.)
Characteristic
Symbol Min Typ Max Unit
TOTAL DEVICE
Input Voltage
V
IN
2.45 − 5.50 V
Output Voltage (I
LOAD
= 0 mA, T
A
= 25°C)
NCP1550SN18T1
NCP1550SN19T1
NCP1550SN25T1
NCP1550SN27T1
NCP1550SN30T1
NCP1550SN33T1
V
OUT
1.764
1.862
2.450
2.646
2.940
3.234
1.8
1.9
2.5
2.7
3.0
3.3
1.836
1.938
2.550
2.754
3.060
3.366
V
Input Current into V
OUT
Pin
NCP1550SN18T1
NCP1550SN19T1
NCP1550SN25T1
NCP1550SN27T1
NCP1550SN30T1
NCP1550SN33T1
I
VOUT
−
−
−
−
−
−
2.5
2.5
2.5
2.5
2.5
2.5
4.0
4.0
4.0
4.0
4.0
4.0
mA
Temperature Coefficient
DV
OUT/
DV
T
− 100 − ppm/°C
Operating Current (V
IN
= 5.0 V, V
CE
= 5.0 V, No External Components)
NCP1550SN18T1
NCP1550SN19T1
NCP1550SN25T1
NCP1550SN27T1
NCP1550SN30T1
NCP1550SN33T1
I
DD
−
−
−
−
−
−
50
50
50
50
50
50
80
80
80
80
80
80
mA
Off−State Current (V
IN
= 5.0 V, V
CE
= 0 V, T
A
= 25°C)
NCP1550SN18T1
NCP1550SN19T1
NCP1550SN25T1
NCP1550SN27T1
NCP1550SN30T1
NCP1550SN33T1
I
OFF
−
−
−
−
−
−
0.3
0.3
0.3
0.3
0.3
0.3
0.5
0.5
0.5
0.5
0.5
0.5
mA
OSCILLATOR
Frequency
F
OSC
510 600 690 kHz
Frequency Temperature Coefficient (T
A
= −40°C to 85°C)
DF
OSC
/DT
A
− 0.11 − %/°C
Maximum Duty Cycle D
MAX
100 − − %
PWM/PFM Switchover ON Time Threshold (Note 4) T
ON(PFM)
167 320 500 ns
Soft−Start Delay Time (Note 4) T
ss
− 8.0 − ms
Protection Delay Time (Auto Restart) T
prot
− 8.0 − ms
OUTPUT DRIVE (PIN 4)
EXT “H” Output Current (V
EXT
= V
IN
– 0.4 V) I
EXTH
− −60 − mA
EXT “L” Output Current (V
EXT
= 0.4 V) I
EXTL
− 100 − mA
EXT “L−H” Rise Time (C
LOAD
= 1000 pF) (V
IN
= 5.0 V) T
r
− 65 − ns
EXT “H−L” Fall Time (C
LOAD
= 1000 pF) (V
IN
= 5.0 V) T
f
− 40 − ns
EXT “L−H” Rise Time (C
LOAD
= 5.0 nF) (V
IN
= 5.0 V) T
r
− 140 − ns
EXT “H−L” Fall Time (C
LOAD
= 5.0 nF) (V
IN
= 5.0 V) T
f
− 90 − ns
4. PWM/PFM Switchover ON Time Threshold min/max guaranteed by design only.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

NCP1550SN25T1

Mfr. #:
Buy NCP1550SN25T1
Manufacturer:
ON Semiconductor
Description:
IC REG CTRLR BUCK 5TSOP
Lifecycle:
New from this manufacturer.
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