LM3556_15 Datasheet, PDF (5/39 Pages) Texas Instruments – Synchronous Boost LED Flash Driver With High-Side Current Source

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LM3556
SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015
6.5 Electrical Characteristics
Unless otherwise specified, V_IN = 3.6 V, typical limits apply for T_A = 25°C, and minimum (MIN) and maximum (MAX) limits
apply over the full operating ambient temperature range (−40°C ≤ T_A ≤ +85°C).⁽¹⁾⁽²⁾
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
CURRENT SOURCE SPECIFICATIONS
I_LED
V_HR
V_OVP
Current source accuracy
1.5-A Flash, V_OUT = 4 V
46.88-mA Torch, V_OUT = 3.6 V
Current source regulation
voltage
I_LED = 1.5 A
I_LED = 46.88 mA
Flash
Torch
Output overvoltage protection ^{ON Threshold}
trip point
OFF Threshold
1.425
(–5%)
42.3 (−10%)
4.86
4.75
1.5
1.575
(+5%)
A
47 51.7 (+10%) mA
250 280 (+12%)
mV
150 172.5 (+15%)
5
5.1
V
4.88
4.99
STEP-UP DC-DC CONVERTER SPECIFICATIONS
R_PMOS
R_NMOS
PMOS switch on-resistance
NMOS switch on-resistance
I_PMOS = 1 A
I_NMOS = 1 A
85
65
−12%
1.7
mΩ
12%
I_CL
Switch current limit
−12%
1.9
−10%
2.5
12%
A
10%
−12%
3.1
12%
V_TRIP
NTC comparator trip
threshold
Configuration Register, bit [1] = 1
−6%
600
6% mV
UVLO
Undervoltage lockout
threshold
Falling V_IN
2.74
2.8
2.85 V
I_NTC
V_IVFM
NTC current
Input voltage flash monitor
trip threshold
−6%
75
–3.2%
2.9
6% µA
3.2% V
ƒ_SW
Switching frequency
2.5 V ≤ V_IN ≤ 5.5 V
I_Q
Quiescent supply current
Device not switching Pass Mode
I_SD
Shutdown supply current
Device disabled, EN = 0V
2.5 V ≤ V_IN ≤ 5.5 V
I_SB
Standby supply current
Device disabled, EN = 2 V
2.5 V ≤ V_IN ≤ 5.5 V
t_TX
Flash-to-torch LED current
settling time
TX low to high,
I_LED = 1.5 A to 46.88 mA
I_OS
I_LED overshoot in external
indicator mode
0 mA to I_TORCH
3.72
4
0.6
0.1
2.5
4
8%
4.28 MHz
0.75 mA
1.3 µA
4 µA
µs
ENABLE, STROBE, TORCH, TX VOLTAGE SPECIFICATIONS
V_IL
Input logic low
V_IH
Input logic high
2.5 V ≤ V_IN ≤ 5.5 V
I²C-COMPATIBLE INTERFACE SPECIFICATIONS (SCL, SDA)
0
0.4
V
1.2
V_IN
V_IL
Input logic low
V_IH
Input logic high
V_OL
Output logic low
2.5 V ≤ V_IN ≤ 4.2 V
I_LOAD = 3 mA
0
0.4
V
1.2
V_IN
400 mV
(1) Minimum and maximum limits are specified by design, test, or statistical analysis. Typical numbers are not verified, but do represent the
most likely norm. Unless otherwise specified, conditions for typical specifications are: V_IN = 3.6 V and T_A = 25°C.
(2) All voltages are with respect to the potential at the GND pin.
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