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PDF AN8016NSH Data sheet ( Hoja de datos )
| Número de pieza | AN8016NSH | |
| Descripción | Single-channel 1.8-volt step-up DC-DC converter control IC | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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Voltage Regulators
AN8016NSH
Single-channel 1.8-volt step-up DC-DC converter control IC
s Overview
The AN8016NSH is a single-channel PWM DC-DC
converter control IC that supports low-voltage operation.
This IC allows a stepped-up voltage output to be pro-
vided with a minimal number of external components. It
features a low minimum operating voltage of 1.8 V, and
due to being provided in a 10-pin surface mount package
with a 0.5 mm lead pitch, is optimal for use in miniature
high-efficiency power supplies for portable equipment.
Unit: mm
1 10
56
s Features
• Wide operating supply voltage range: 1.8 V to 14 V
• High-precision reference voltage circuit: 1.27 V (allow-
0.5±0.2
4.3±0.30
6.3±0.30
ance: ± 3%)
• Supports control over a wide output frequency range:
SSOP010-P-0225
20 kHz to 1 MHz
• Provides a fixed output current with minimal supply voltage fluctuations by using an external resistor to set the output
current with a totem pole structure in the output block.
• Large maximum output current of ± 50 mA
• Timer latch short-circuit protection circuit (charge current: 1.3 µA typical)
• Low input voltage malfunction prevention circuit (U.V.L.O.) (circuit operation start voltage: 1.6 V typical)
• On/off control function (active-high, standby current: 5 µA maximum)
• Fixed maximum duty ratio with small sample-to-sample variations (80% ± 5%)
• Adjustable soft start time provided by using separate DTC and S.C.P. pins.
• Adopts a 0.5 mm lead pitch 10 pin SO flat package (SSONF-10D)
• Adopts techniques for reducing noise, increasing the light load efficiency, and suppressing the maximum base current
when turning on the npn transistor used as the external switching element.
s Applications
• LCD displays, digital still cameras, PDAs
1
1 page  
Voltage Regulators
AN8016NSH
s Electrical Characteristics at VCC = 2.4 V, Ta = 25°C (continued)
• Design reference data
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Parameter
Symbol
Conditions
Min Typ Max
U.V.L.O. block
Reset voltage
Error amplifier block
VR
0.8
VTH temperature characteristics
Output source current
Output sink current
Open-loop gain
PWM comparator block
VTHdT
ISO(FB)
ISI(FB)
AV
Ta = −30°C to +85°C
VFB = 0.5 V
VFB = 0.5 V
− 0.5
+ 0.5
−40
2
80
SS pin voltage
Output block
VSS
1.22
RB pin voltage
Oscillator frequency supply
voltage characteristics
VB RB = 390 Ω
fdV VCC = 1.8 V to 14 V
0.13
−1 +1
Oscillator frequency temperature fdT
characteristics
Ta = −30°C to 85°C
−3 +3
Short-circuit protection circuit block
Comparator threshold voltage
On/off control block
VTHL
1.27
On/Off pin current
IOFF VOFF = 1.5 V
23
Unit
V
%
µA
mA
dB
V
V
%
%
V
µA
5
5 Page 
Voltage Regulators
AN8016NSH
s Application Notes (continued)
[4] Functional descriptions
1. Reference voltage block
This circuit is composed of a band gap circuit, and outputs a 1.26-volt temperature compensated reference
voltage. This reference voltage is stabilized when the supply voltage is 1.8 V or higher.
2. Triangular wave generator
This circuit generates a triangular wave like
sawtooth with a peak of 0.75 V and a trough of 0.2
V using a capacitor (for the time constant) and resis-
tor connected to the OSC pin (pin 9). The oscillator
frequency can be set to any value by selecting appro-
priate values for the external capacitor and resistor,
CT and RT. This oscillator can provide a frequency in
the range 20 kHz to 1 MHz. The triangular wave sig-
nal is provided to the inverting input of the PWM
comparator internally to the IC. Use the formulas
below for rough calculation of the oscillator fre-
quency.
VOSCH ≈ 0.75 V
VOSCL ≈ 0.2 V
t1
Rapid
charge
t2
Discharge
T
Figure 1. Triangular oscillator waveform
11
fOSC ≈ −
CT × RT × ln
VOSCL
VOSCH
≈ 0.75 ×
CT × RT
[Hz]
Note, however, that the above formulas do not take the rapid charge time, overshoot, and undershoot into
account. See the experimentally determined graph of the oscillator frequency vs. timing capacitance value
provided in the main characteristics section.
3. Error amplifier
This circuit is an npn-transistor input error ampli-
fier that detects and amplifies the DC-DC converter
output voltage, and inputs that signal to a PWM com-
parator. The 1.27 V internal reference voltage is
applied to the noninverting input. Arbitrary gain and
phase compensation can be set up by inserting a re-
sistor and capacitor in series between the error am-
plifier output pin (pin 10) and the inverting input pin
(pin 1). The output voltage VOUT can be set by resis-
tor-dividing the output as shown in figure 2.
VOUT
R1
R2
VOUT = 1.27 ×
R1 + R2
R2
FB 10
Error
IN− 1 amplifier
1.27 V To the PWM
comparator input
Figure 2. Connection method of error amplifier
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AN8016NSH.PDF ] | |
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