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NCV6334BMTAATBG

P1-P3P4-P6P7-P9P10-P12P13-P14
NCV6334B
http://onsemi.com
7
TYPICAL OPERATING CHARACTERESTICS
Figure 9. Efficiency vs. Output Current and
Input Voltage (V
OUT
= 3.3 V, T
A
= 255C)
Figure 10. Efficiency vs. Output Current and
Input Voltage (V
OUT
= 4 V , T
A
= 255C)
Figure 11. Load Regulation vs. Output Current
and Input Voltage (V
OUT
= 1.8 V, T
A
= 255C)
Figure 12. Load Regulation vs. Output Current
and Temperature (V
IN
= 3.6 V, V
OUT
= 1.8 V).
Figure 13. Output Ripple Voltage in PWM Mode
(V
IN
= 3.6 V, V
OUT
= 1.8 V, I
OUT
= 1 A, L=1 mH,
C
OUT
= 10 mF)
Figure 14. Output Ripple Voltage in PFM Mode
(V
IN
= 3.6 V, V
OUT
= 1.8 V, I
OUT
= 10 mA, L=1 mH,
C
OUT
= 10 mF)
50
55
60
65
70
75
80
85
90
95
100
1 10 100 1000 10000
I
out
, OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
in
= 3.6 V
V
in
= 5.5 V
50
55
60
65
70
75
80
85
90
95
100
1 10 100 1000 10000
V
in
= 4.5 V
V
in
= 5.5 V
I
out
, OUTPUT CURRENT (mA)
EFFICIENCY (%)
1.78
1.79
1.80
1.81
1.82
0 200 400 600 800 1000 1200 1400 1600 1800 2000
I
out
, OUTPUT CURRENT (mA)
LOAD REGULATION (V)
V
in
= 5.5 V
V
in
= 3.6 V
0 200 400 600 800 1000 1200 1400 1600 1800 2000
I
out
, OUTPUT CURRENT (mA)
LOAD REGULATION (V)
T
A
= 25°C
T
A
= 85°C
T
A
= −40°C
V
in
= 2.7 V
1.83
1.77
1.78
1.79
1.80
1.81
1.82
1.83
1.77
VOUT
4 mV
SW
Time: 500 ns / Div
VOUT
25 mV
SW
10 mV / Div
5 mV / Div
2 V / Div
Time: 5 ms / Div
2 V / Div
NCV6334B
http://onsemi.com
8
TYPICAL OPERATING CHARACTERESTICS
Figure 15. Load Transient Response (V
IN
= 3.6 V,
V
OUT
= 1.8 V, I
OUT
= 500 mA to 1500 mA, L = 1 mH,
C
OUT
= 10 mF)
Figure 16. Power Up Sequence and Inrush Current in
Input (V
IN
= 3.6 V, V
OUT
= 1.8 V, I
OUT
= 0 A,
L = 1 mH, C
OUT
= 10 mF)
Figure 17. Power Up Sequence and Power Good
(V
IN
= 3.6 V, V
OUT
= 1.8 V, I
OUT
= 0 A, L = 1 mH,
C
OUT
= 10 mF)
Figure 18. Power Down Sequence and Active Output
Discharge (V
IN
= 3.6 V, V
OUT
= 1.8 V, I
OUT
= 0 A,
L = 1 mH, C
OUT
= 10 mF)
−70 mV
VOUT
IOUT 1 A / Div
1500 mA
500 mA 500 mA
SW 2 V / Div
EN 5 V/ Div
SW 5 V / Div
VOUT 1.0 V / Div
Iin 100 mA / Div
Time: 20 ms / Div
70 mA
100 mV
100 mV / Div
Time: 100 ms / Div
VOUT 1.0 V / Div
EN 5 V/ Div
SW 2 V / Div
Time: 1 ms / Div
PG 5 V / Div
VOUT 1.0 V / Div
EN 5 V/ Div
SW 2 V / Div
Time: 200 ms / Div
PG 5 V / Div
NCV6334B
http://onsemi.com
9
DETAILED DESCRIPTION
General
The NCV6334B, a family of voltage−mode synchronous
buck converters, which is optimized to supply different
sub−systems of portable applications powered by one cell
Li−ion or three cell Alkaline/NiCd/NiMH batteries. The
devices are able to deliver up to 2 A on an external adjustable
voltage. Operation with 3 MHz switching frequency allows
employing small size inductor and capacitors. Input supply
voltage feedforward control is employed to deal with wide
input voltage range. Synchronous rectification and
automatic PWM/PFM power save mode offer improved
system efficiency.
PWM Mode Operation
In medium and heavy load range, the inductor current is
continuous and the device operates in PWM mode with fixed
switching frequency, which has a typical value of 3 MHz. In
this mode, the output voltage is regulated by on−time pulse
width modulation of an internal P−MOSFET. An internal
N−MOSFET operates as synchronous rectifier and its
turn−on signal is complimentary to that of the P−MOSFET.
PFM Mode Operation
In light load range, the inductor current becomes
discontinuous and the device automatically operates in PFM
mode with an adaptive fixed on time and variable switching
frequency. In this mode, the output voltage is regulated by
pulse frequency modulation of the internal P−MOSFET, and
the switching frequency is almost proportional to the
loading current. The internal N−MOSFET operates as
synchronous rectifier after each on pulse of the P−MOSFET
with a very small negative current limit. When the load
increases and the inductor current becomes continuous, the
controller automatically turns back to the fixed−frequency
PWM mode operation.
Undervoltage Lockout
The input voltage VIN must reach or exceed 2.4 V
(typical) before the NCV6334B enables the converter
output to begin the start up sequence. The UVLO threshold
hysteresis is typically 100 mV.
Enable
The NCV6334B has an enable logic input pin EN. A high
level (above 1.1 V) on this pin enables the device to active
mode. A low level (below 0.4 V) on this pin disables the
device and makes the device in shutdown mode. There is an
internal filter with 5 ms time constant. The EN pin is pulled
down by an internal 10 nA sink current source. In most of
applications, the EN signal can be programmed
independently to VIN power sequence.
EN
PG
Vout
95%
90%
1.1V
0.4V
300us
1.15ms 8us 5us 8us
Active
Discharge
8us
100us
Figure 19. Power Good and Active Discharge Timing Diagram
P1-P3P4-P6P7-P9P10-P12P13-P14

NCV6334BMTAATBG

Mfr. #:
Buy NCV6334BMTAATBG
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators USR BUCK CONVERTER
Lifecycle:
New from this manufacturer.
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