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NCP1530
600 mA PWM/PFM
Step- Down Converter with
-
External Synchronization Pin
The NCP1530 is a PWM/PFM non- synchronous step- down
-
-
(Buck) DC- DC converter for usage in systems supplied from 1- cell
-
-
Li- ion, or 2 or more cells Alkaline/NiCd/NiMH batteries. It can
-
operate in Constant- Frequency PWM mode or PWM/PFM mode in
-
which the controller will automatically switch to PFM mode
operation at low output loads to maintain high efficiency. The
switching frequency can also be synchronized to external clock
between 600 kHz and 1.2 MHz. The maximum output current is up
to 600 mA. Applying an external synchronizing signal to SYN pin
can supersede the PFM operation.
The NCP1530 consumes only 47
mA
(typ) of supply current
(V
OUT
= 3.0 V, no switching) and can be forced to shutdown mode by
bringing the enable input (EN) low. In shutdown mode, the regulator
is disabled and the shutdown supply current is reduced to
0.5
mA
(typ). Other features include built- in undervoltage lockout,
-
internal thermal shutdown, an externally programmable soft- start
-
time and output current limit protection. The NCP1530 operates
from a maximum input voltage of 5.0 V and is available in a space
saving, low profile Micro8™ package.
Features
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MARKING
DIAGRAM
Micro8™
DM SUFFIX
CASE 846A
1
xxxx
ALYW
8
xxxx
A
L
Y
W
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
PIN CONNECTIONS
V
IN
SYN
SS
GND
1
2
3
4
(Top View)
8
7
6
5
LX
V
REF
V
OUT
EN
•
Pb-- Free Package is Available
•
High Conversion Efficiency, up to 92% at V
IN
= 4.3 V,
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
V
OUT
= 3.3 V, I
OUT
= 300 mA
Current- Mode PWM Control
-
Automatic PWM/PFM Mode for Current Saving at Low Output Loads
Internal Switching Transistor Support 600 mA Output Current
(V
IN
= 5.0 V, V
OUT
= 3.3 V)
High Switching Frequency (600 kHz), Support Small Size Inductor
and Capacitor, Ceramic Capacitors Can be Used
Synchronize to External Clock Signal up to 1.2 MHz
100% Duty Cycle for Maximum Utilization of the Supply Source
Programmable Soft- Start Time through External Chip Capacitor
-
Externally Accessible Voltage Reference
Built- In Input Undervoltage Lockout
-
Built- In Output Overvoltage Protection
-
Power Saving Shutdown Mode
Space Saving, Low Profile Micro8 Package
PDAs
Digital Still Camera
Cellular Phone and Radios
Portable Test Equipment
Portable Scanners
Portable Audio Systems
466
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 479 of this data sheet.
Typical Applications
©
Semiconductor Components Industries, LLC, 2005
January, 2005 - Rev. 4
Publication Order Number:
NCP1530/D
NCP1530
L1 5.6
mH
V
IN
= 2.8 V to 5.0 V
V
IN
LX
D1
MBRM120ET3
V
OUT
= 3.0 V
SYN
SS
*C
SS
C
IN
22
mF
GND
NCP1530
V
OUT
V
REF
EN
*C
VREF
1.0
mF
C
OUT
22
mF
*Optional Component
Figure 1. Typical Step-
-Down Converter Application
V
IN
1
EN 5
ENABLE
DETECT
THERMAL
SHUTDOWN
UVLO
MASTER ENABLE
ISEN
SYNC
DETECT
AND
TIMING
BLOCK
MODE
SELECTION
MODE
ILIMIT
ISEN
ISEN
SYN 2
ISEN
+
-
-
OV
+
CONTROL
LOGIC
DRV
0.04
V
REF
50 nA
FB
-
-
OTA
+
-
-
8 LX
-
-
+
-
-
6 V
OUT
SS 3
VOLTAGE
REFERENCE
AND
SOFT-
-START
10 pF
V
REF
+
FB
V
REF
7
4 GND
Figure 2. Simplified Functional Block Diagram
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467
NCP1530
PIN FUNCTION DESCRIPTIONS
Pin
1
2
Symbol
V
IN
SYN
Unregulated Supply Input.
Oscillator Synchronization and Mode Selection Input.
SYNC = GND (Automatic PWM/PFM mode) The converter operates at 600 kHz fixed-
-frequency PWM mode
primarily, and automatically switches to variable-
-frequency PFM mode at small output loads for power saving.
SYNC = V
IN
(Constant-
-Frequency PWM mode) The converter operates at 600 kHz fixed-
-frequency PWM mode
always.
SYNC = External clock signal between 600 to 1200 kHz. The converter will be synchronized with the external
clock signal.
The SYNC pin is internally pulled to GND.
Soft-
-Start Timing control pin. An external soft-
-start capacitor can be connected to this pin if extended soft-
-start is
required. A 50 nA current will be sourced from this pin to charge up the capacitor during startup and gently ramps
the device into service to prevent output voltage overshoot. If this pin is floated, built- 500
ms
(typ.) soft-
-in
-start
will be activated.
Ground Terminal.
Active-
-High Enable Input. Active to enable the device. Bring this pin to GND and the quiescent current is reduced
to less than 0.5
mA.
This pin is internally pulled to V
IN
.
Feedback Terminal. The output voltage is sensed by this pin.
Connected to voltage reference decoupling capacitor. For noise non-
-sensitive applications, the internal voltage
reference can operate without decoupling capacitor.
Inductor Terminal. This pin is connected to the drains of the internal P-
-channel switching transistors. The inductor
must be connected between this pin and the output terminal.
Description
3
SS
4
5
6
7
8
GND
EN
V
OUT
V
REF
LX
MAXIMUM RATINGS
Rating
Power Supply (Pin 1)
Input/Output Pins (Pins 2- & Pins 7-
-4
-8)
Thermal Characteristics
Micro8 Plastic Package
Thermal Resistance, Junction- -Air
-to-
Operating Junction Temperature Range
Operating Ambient Temperature Range
Storage Temperature Range
Symbol
V
IN
V
IO
R
θJA
Value
-
-0.3 to 6
-
-0.3 to 6
240
Unit
V
V
°C/W
T
J
T
A
T
stg
0 to +150
0 to +85
-
-55 to +150
°C
°C
°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.
4. 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)
200
V per JEDEC standard: JESD22-
-A115.
5. Latchup Current Maximum Rating:
150
mA per JEDEC standard: JESD78.
6. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J-
-STD-
-020A.
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468
NCP1530
ELECTRICAL CHARACTERISTICS
(V
IN
= V
R
+ 1.0 V, test circuit, refer to Figure 1, C
SS
= NC and C
VREF
= 1.0
mF,
T
A
= 25°C for
Characteristic
Input Voltage
Output Voltage (I
load
= 150 mA, V
R
+ 1.0 V < V
IN
< 5.0 V) (Note 7)
NCP1530DM25R2
NCP1530DM27R2
NCP1530DM30R2
NCP1530DM33R2
Maximum Output Current (V
IN
= 5.0 V, V
OUT
= 3.0 V) (Note 8)
Supply Current (V
IN
= V
R
+ 1.0 V, No Load, EN and SYN Pins NC)
Shutdown Supply Current (V
IN
= 5.0 V, No Load, V
EN
= 0 V)
LX Pin Leakage Current (No Load, V
EN
= 0 V)
Internal P-
-FET ON Resistance at LX Pin
(V
IN
= V
R
+ 1.0 V, I
Load
= 150 mA)
Oscillator Frequency
(V
IN
= V
EN
= V
R
+ 1.0 V, I
Load
= 100 mA, SYN Pin NC)
Maximum PWM Duty Cycle (Note 8)
PFM to PWM Switch-
-Over Current Threshold
(V
IN
= 4.5 V, SYN Pin NC, L = 5.6
mH,
C
OUT
= 22
mF)
(Note 8)
NCP1530DM25R2
NCP1530DM27R2
NCP1530DM30R2
NCP1530DM33R2
PWM to PFM Switch-
-Over Current Threshold
(V
IN
= 4.5 V, SYN Pin NC, L = 5.6
mH,
C
OUT
= 22
mF)
(Note 8)
NCP1530DM25R2
NCP1530DM27R2
NCP1530DM30R2
NCP1530DM33R2
Input Undervoltage Lockout Threshold
Reference Voltage (V
IN
= V
R
+ 1.0 V, C
VREF
= 1.0
mF)
Reference Voltage Temperature Coefficient
(V
IN
= V
R
+ 1.0 V, C
VREF
= 1.0
mF)
(Note 8)
Reference Voltage Load Current
(V
IN
= V
R
+ 1.0 V, C
VREF
= 1.0
mF)
(Note 9)
Enable Logic High Threshold Voltage (V
IN
= V
R
+ 1.0 V, I
Load
= 0 mA)
Enable Logic Low Threshold Voltage (V
IN
= V
R
+ 1.0 V, I
Load
= 0 mA)
PWM Minimum On-
-Time (Note 8)
PWM OV Protection Level
PWM Cycle- -Cycle Current Limit (Note 8)
-by-
Built- Soft-
-in
-Start Time (V
OUT
= 3.0 V, SS Pin NC) (Note 8)
Thermal Shutdown Threshold (V
IN
= 3.5 V, I
Load
= 0 mA) (Note 8)
Thermal Shutdown Hysteresis (V
IN
= 3.5 V, I
Load
= 0 mA) (Note 8)
Symbol
V
IN
V
OUT
Min
1.1 V
R
2.425
2.619
2.910
3.201
600
-
-
-
-
-
-
-
-
480
-
-
Typ
-
-
2.5
2.7
3.0
3.3
-
-
45
0.5
-
-
0.3
600
-
-
Max
5.0
2.575
2.781
3.090
3.399
-
-
95
1.0
1.0
0.5
720
100
mA
mA
mA
mA
Ω
kHz
%
mA
-
-
-
-
-
-
-
-
I
PWM--PFM
-
-
-
-
-
-
-
-
V
UVLO
V
REF
TC
VREF
I
VREF
V
EN--H
V
EN--L
t
PWM--ON
%V
OV
I
LIM
t
SS
TH
SHD
TH
HSYS
-
-
1.184
-
-
5.0
-
-
0.5
-
-
-
-
-
-
-
-
-
-
-
-
27
38
39
48
2.0
1.20
0.03
-
-
1.5
1.2
100
6.0
1.5
500
145
15
-
-
-
-
-
-
-
-
2.45
1.216
-
-
-
-
1.85
-
-
-
-
12
-
-
-
-
-
-
-
-
V
V
mV/°C
mA
V
V
ns
%
A
ms
°C
°C
83
90
100
102
-
-
-
-
-
-
-
-
mA
Unit
V
V
typical value, 0°C
≤
T
A
≤
85°C for min/max values unless otherwise noted.) *V
R
is the factory-
-programmed output voltage setting.
I
OUT(max)
I
IN
I
SHDN
I
LX
R
DS(ON)
f
OSC
D
MAX--PWM
I
PFM--PWM
7. Tested at V
IN
= V
R
+ 1.0 V in production only. Full V
IN
range guaranteed by design.
8. Parameter guaranteed by design only, not tested in production.
9. Loading capability decreases with V
OUT
decreases.
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469
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